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Dr. Nadavala Siva Kumar
Department of Chemical Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia

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Research Keywords & Expertise

0 Kinetic Modeling
0 Wastewater Treatment
0 Biosorption
0 Adsorption, Activated Carbon, Density Functional Theory, Scanning Electron Microscopy, X-rays Dispersive Spectroscopy
0 waste biomass managment

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Journal article
Published: 14 July 2021 in Prostaglandins & Other Lipid Mediators
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Leucas vestita Wall. ex. Benth., is an endemic species restricted to Western Ghats, India. In this study, the carrageenan-induced anti-inflammatory model was used to evaluate the influence of L. vestita ethanol extract on inflammation. The Ethanol extract was tested for its anti-inflammatory property at a dose of 200mg/kg po. and 400mg/kg po. The paw volume was reduced gradually, three hours after administration of the extract. The extract showed a dosage dependant activity. The compounds present in the ethanol extract were identified by using HPLC and the binding affinity of these compounds against Cyclo-oxygenase-2 (COX-2, the enzyme involved in the perception of pain) was analyzed by using FlexX molecular docking suite.

ACS Style

S.V. Rajesh; T.S. Gnanendra; T. Senthil Kumar. ANTI-INFLAMMATORY AND MOLECULAR DOCKING ANALYSIS OF LEUCAS VESTITA Wall. Ex. Benth. EXTRACT AGAINST CYCLO-OXYGENASE-2. Prostaglandins & Other Lipid Mediators 2021, 156, 106581 .

AMA Style

S.V. Rajesh, T.S. Gnanendra, T. Senthil Kumar. ANTI-INFLAMMATORY AND MOLECULAR DOCKING ANALYSIS OF LEUCAS VESTITA Wall. Ex. Benth. EXTRACT AGAINST CYCLO-OXYGENASE-2. Prostaglandins & Other Lipid Mediators. 2021; 156 ():106581.

Chicago/Turabian Style

S.V. Rajesh; T.S. Gnanendra; T. Senthil Kumar. 2021. "ANTI-INFLAMMATORY AND MOLECULAR DOCKING ANALYSIS OF LEUCAS VESTITA Wall. Ex. Benth. EXTRACT AGAINST CYCLO-OXYGENASE-2." Prostaglandins & Other Lipid Mediators 156, no. : 106581.

Journal article
Published: 09 June 2021 in Journal of Energy Storage
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Due to our imminent energy need, alternative energy resources are inevitably required to be incorporated into our energy storage devices to fulfill the electricity needs. In this context, carbonized and activated high specific surface area and micro/mesoporous carbon obtained from the cotton leaves have been examined for flexible supercapacitor (FSC) using natural ocean water as an electrolyte. The as-prepared FSC based on cotton leaves-derived porous carbon (CLPC) in Ocean water-electrolyte showed an excellent specific capacitance (Csp) of 212 F.g−1 at 1.0 A.g−1 with outstanding cycling stability of 89% for 5000 cycles at high current density. The FSC shows outstanding flexibility and durability upon strong mechanical bending cycles. Also, CLPC electrodes exhibit a high energy density of 7.36 Wh.kg−1 at a power density of 500 W.kg−1, which is better than those of earlier published similar bio-mass carbon materials, indicating the eye-grabbing significance of abundant and inexpensive ocean water as a natural electrolyte in production of flexible energy storage devices.

ACS Style

Yanna Mao; Nadavala Siva Kumar; Abhishek Dhar; Anesh Manjaly Poulose; Muhammad Kashif; Ebrahim H. Al-Ghurabi; Mohammad Asif; Mourad Boumaza; Yongtao Duan; Rohit L. Vekariya. Economic designing of high-performance flexible supercapacitor based on cotton leaf derived porous carbon and natural ocean water. Journal of Energy Storage 2021, 40, 102784 .

AMA Style

Yanna Mao, Nadavala Siva Kumar, Abhishek Dhar, Anesh Manjaly Poulose, Muhammad Kashif, Ebrahim H. Al-Ghurabi, Mohammad Asif, Mourad Boumaza, Yongtao Duan, Rohit L. Vekariya. Economic designing of high-performance flexible supercapacitor based on cotton leaf derived porous carbon and natural ocean water. Journal of Energy Storage. 2021; 40 ():102784.

Chicago/Turabian Style

Yanna Mao; Nadavala Siva Kumar; Abhishek Dhar; Anesh Manjaly Poulose; Muhammad Kashif; Ebrahim H. Al-Ghurabi; Mohammad Asif; Mourad Boumaza; Yongtao Duan; Rohit L. Vekariya. 2021. "Economic designing of high-performance flexible supercapacitor based on cotton leaf derived porous carbon and natural ocean water." Journal of Energy Storage 40, no. : 102784.

Journal article
Published: 12 May 2021 in Sensors and Actuators A: Physical
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Neurotransmitter Dopamine and purine-metabolism-derived Uric acid are quintessential compositions of the human body. The presence of these two substances to the proper extent is highly needed for a fit human being. In this paper we have synthesized Cu nanoparticle supported on reduced graphene oxide ([email protected]) by simple, cost-effective method, characterized the material by different techniques like Atomic Force Microscopy (AFM), UV-Visible spectroscopy, Fourier Transform Infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and Raman spectroscopy. Cyclic voltammetry (CV) and Electrochemical impedance spectroscopy (EIS) have been performed to confirm the effectivity of this material as an electrochemical sensor of Dopamine (DA) and Uric acid (UA).

ACS Style

Nadavala Siva Kumar; Ebrahim H. Al-Ghurabi; Mohammad Asif; Mourad Boumaza. Retrieving and morphological portrayal of Cu-nanoparticle impregnated reduced graphene oxide ([email protected]) electrochemical bio-sensor. Sensors and Actuators A: Physical 2021, 329, 112826 .

AMA Style

Nadavala Siva Kumar, Ebrahim H. Al-Ghurabi, Mohammad Asif, Mourad Boumaza. Retrieving and morphological portrayal of Cu-nanoparticle impregnated reduced graphene oxide ([email protected]) electrochemical bio-sensor. Sensors and Actuators A: Physical. 2021; 329 ():112826.

Chicago/Turabian Style

Nadavala Siva Kumar; Ebrahim H. Al-Ghurabi; Mohammad Asif; Mourad Boumaza. 2021. "Retrieving and morphological portrayal of Cu-nanoparticle impregnated reduced graphene oxide ([email protected]) electrochemical bio-sensor." Sensors and Actuators A: Physical 329, no. : 112826.

Journal article
Published: 22 April 2021 in Polymers
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A tremendous potential has been observed in the designing of long afterglow materials for sensing, bioimaging, and encryption applications. In this study, two different strontium aluminate-based luminescent materials; SrAl2O4: Eu, Dy (S1), and Sr4Al14O25: Eu, Dy (S2) were melt-mixed with polypropylene (PP) matrix, and the phosphorescence properties were evaluated. After excitation at 320 nm, the PP/S1 composite exhibited a green emission and the PP/S2 generated a blue emission at 520 nm and 495 nm, respectively. The emission spectra intensity increased by increasing the content of these luminescent fillers. The attenuated total reflection-Fourier transform infrared (ATR-FTIR) experiments show that no chemical reaction occurred during the melt-mixing process. The differential scanning calorimetry (DSC) results revealed that the total crystallinity of the composites reduced by increasing the amount of the fillers; however, no changes in the temperature of melting (Tm) and crystallization (Tc) of PP were observed. Both fillers improved the impact strength of the composites, but the tensile strength (TS) and modulus (TM) decreased. Poly (ethylene glycol) dimethyl ether (P) plasticizer was used to improve the filler-matrix interaction and its dispersion; nevertheless, it adversely affected the intensity of the luminescence emissions.

ACS Style

Anesh Poulose; Arfat Anis; Hamid Shaikh; Abdullah Alhamidi; Nadavala Siva Kumar; Ahmed Elnour; Saeed Al-Zahrani. Strontium Aluminate-Based Long Afterglow PP Composites: Phosphorescence, Thermal, and Mechanical Characteristics. Polymers 2021, 13, 1373 .

AMA Style

Anesh Poulose, Arfat Anis, Hamid Shaikh, Abdullah Alhamidi, Nadavala Siva Kumar, Ahmed Elnour, Saeed Al-Zahrani. Strontium Aluminate-Based Long Afterglow PP Composites: Phosphorescence, Thermal, and Mechanical Characteristics. Polymers. 2021; 13 (9):1373.

Chicago/Turabian Style

Anesh Poulose; Arfat Anis; Hamid Shaikh; Abdullah Alhamidi; Nadavala Siva Kumar; Ahmed Elnour; Saeed Al-Zahrani. 2021. "Strontium Aluminate-Based Long Afterglow PP Composites: Phosphorescence, Thermal, and Mechanical Characteristics." Polymers 13, no. 9: 1373.

Research article
Published: 19 February 2021 in Environmental Science and Pollution Research
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Herein, we report the synthesis of between SnO2 QDs /AgVO3 nanoribbons/g-C3N4 nanosheets of ternary photocatalytic systems for the production of H2 through light irradiation. The SnO2/AgVO3/g-C3N4 photocatalyst was successfully produced by using the hydrothermal process. The structural characterizations of the samples revealed the successful formation of ternary heterostructures where SnO2, AgVO3 and g-C3N4 (quantum dots/nanoribbons/nanosheets) 0D/1D/2D structures make a good interface with each other. The fabricated heterostructures of AgVO3/g-C3N4 and SnO2/AgVO3/g-C3N4 photocatalytic structures performed enriched photocatalytic performance for H2 production over that of the pristine g-C3N4, AgVO3 and SnO2 photocatalysts. The AgVO3/g-C3N4 and SnO2 /AgVO3/g-C3N4 of photocatalysts were found to produce H2 of around 17,000 μmol g-1 and 77,000 μmol g-1, respectively, which is much 4.5 times greater than that of AgVO3/g-C3N4 photocatalyst. Moreover, the photodegradation behaviours of prepared catalysts were studied with the dye (rhodamine B, RhB) under light irradiation. The ternary composite SnO2/AgVO3/g-C3N4 performed photodegradation of RhB in 50 min. The higher photocatalytic activity for the ternary photocatalysts is predominantly due to the effective charge separation at the perfect interface formation amid SnO2 and AgVO3/g-C3N4.

ACS Style

Ganesh Koyyada; Nadavala Siva Kumar; Ebrahim H. Al-Ghurabi; Mohammad Asif; Koduru Mallikarjuna. Enhanced solar-driven photocatalytic performance of a ternary composite of SnO2 quantum dots//AgVO3 nanoribbons//g-C3N4 nanosheets (0D/1D/2D) structures for hydrogen production and dye degradation. Environmental Science and Pollution Research 2021, 28, 31585 -31595.

AMA Style

Ganesh Koyyada, Nadavala Siva Kumar, Ebrahim H. Al-Ghurabi, Mohammad Asif, Koduru Mallikarjuna. Enhanced solar-driven photocatalytic performance of a ternary composite of SnO2 quantum dots//AgVO3 nanoribbons//g-C3N4 nanosheets (0D/1D/2D) structures for hydrogen production and dye degradation. Environmental Science and Pollution Research. 2021; 28 (24):31585-31595.

Chicago/Turabian Style

Ganesh Koyyada; Nadavala Siva Kumar; Ebrahim H. Al-Ghurabi; Mohammad Asif; Koduru Mallikarjuna. 2021. "Enhanced solar-driven photocatalytic performance of a ternary composite of SnO2 quantum dots//AgVO3 nanoribbons//g-C3N4 nanosheets (0D/1D/2D) structures for hydrogen production and dye degradation." Environmental Science and Pollution Research 28, no. 24: 31585-31595.

Paper
Published: 03 February 2021 in RSC Advances
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Microwave-assisted solvothermal fabrication of ZnCo2O4 nanostructures for energy storage applications like supercapacitors and batteries.

ACS Style

Ganesh Koyyada; Nadavala Siva Kumar; Ibrahim H. Al. Ghurabi; Mourad Boumaza; Jae Hong Kim; Koduru Mallikarjuna. In situ microwave-assisted solvothermal synthesis via morphological transformation of ZnCo2O4 3D nanoflowers and nanopetals to 1D nanowires for hybrid supercapacitors. RSC Advances 2021, 11, 5928 -5937.

AMA Style

Ganesh Koyyada, Nadavala Siva Kumar, Ibrahim H. Al. Ghurabi, Mourad Boumaza, Jae Hong Kim, Koduru Mallikarjuna. In situ microwave-assisted solvothermal synthesis via morphological transformation of ZnCo2O4 3D nanoflowers and nanopetals to 1D nanowires for hybrid supercapacitors. RSC Advances. 2021; 11 (11):5928-5937.

Chicago/Turabian Style

Ganesh Koyyada; Nadavala Siva Kumar; Ibrahim H. Al. Ghurabi; Mourad Boumaza; Jae Hong Kim; Koduru Mallikarjuna. 2021. "In situ microwave-assisted solvothermal synthesis via morphological transformation of ZnCo2O4 3D nanoflowers and nanopetals to 1D nanowires for hybrid supercapacitors." RSC Advances 11, no. 11: 5928-5937.

Research article
Published: 28 January 2021 in Scientific Reports
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This study investigated a novel agricultural low-cost bio-waste biochar derived from wood apple fruit shell waste via the pyrolysis method, which is modified by ball milling and utilized to remove toxic phenol and chlorophenols (4-CPh and 2,4-DCPh) from contaminated aqueous media. The ball-milled wood apple fruit shell waste biochar (WAS-BC) sorbent was systematically analyzed by BET, CHN, and FTIR as well as particle size, SEM–EDS, XPS and TGA studies. The sorption equilibrium and kinetic studies exhibit that the sorption capacity was greater than 75% within the first 45 min of agitation at pH 6.0. The uptake capacity of 2,4-DCPh onto WAS-BC was greater than those of 4-CPh and phenol. Equilibrium results were consistent with the Langmuir isotherm model, while the kinetic data were best represented by the Elovich and pseudo-second-order model. The maximum uptake of phenol, 4-CPh, and 2,4-DCPh was 102.71, 172.24, and 226.55 mg/g, respectively, at 30 ± 1 °C. Thus, this study demonstrates that WAS-BC is an efficient, low-cost sorbent that can be used for the elimination of phenol and chlorophenol compounds from polluted wastewater.

ACS Style

Nadavala Siva Kumar; Hamid M. Shaikh; Mohammad Asif; Ebrahim H. Al-Ghurabi. Engineered biochar from wood apple shell waste for high-efficient removal of toxic phenolic compounds in wastewater. Scientific Reports 2021, 11, 1 -17.

AMA Style

Nadavala Siva Kumar, Hamid M. Shaikh, Mohammad Asif, Ebrahim H. Al-Ghurabi. Engineered biochar from wood apple shell waste for high-efficient removal of toxic phenolic compounds in wastewater. Scientific Reports. 2021; 11 (1):1-17.

Chicago/Turabian Style

Nadavala Siva Kumar; Hamid M. Shaikh; Mohammad Asif; Ebrahim H. Al-Ghurabi. 2021. "Engineered biochar from wood apple shell waste for high-efficient removal of toxic phenolic compounds in wastewater." Scientific Reports 11, no. 1: 1-17.

Journal article
Published: 17 November 2020 in Applied Sciences
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Nanosilica is widely used in various applications, with its market expected to grow over USD 5 billion by 2025. The fluidized bed technology, owing to its intimate contact and efficient mixing of phases, is ideally suited for the large scale processing of powders. However, the bulk processing and dispersion of ultrafine nanosilica using the fluidized bed technology are critically affected by the interparticle forces, such that the hydrophilic nanosilica shows agglomerate bubbling fluidization (ABF), while the hydrophobic nanosilica undergoes agglomerate particulate fluidization (APF). This study carried out a detailed investigation into the fluidization hydrodynamic of the hydrophobic nanosilica by monitoring the region-wise dynamics of the fluidized bed subjected to a regular step change of fixed duration in the gas velocity. The gas flow was controlled using a mass controller operated with an analog output signal from a data acquisition system. The analog input data were acquired at the sampling rate of 100 Hz and analyzed in both time and temporal frequency domains. The effect of velocity transients on the bed dynamics was quickly mitigated and appeared as lower frequency events, especially in regions away from the distributor. Despite the apparent particulate nature of the fluidization, strong hysteresis was observed in both pressure drop and bed expansion. Moreover, the fully fluidized bed’s pressure drop was less than 75% of the theoretical value even though the bed appeared to free from non-homogeneities. Key fluidization parameters, e.g., minimum fluidization velocity (Umf) and the agglomerate size, were evaluated, which can be readily used in the large scale processing of nanosilica powders using fluidized bed technology.

ACS Style

Ebrahim H. Al-Ghurabi; Mohammad Asif; Nadavala Siva Kumar; Sher Afghan Khan. Fluidization Dynamics of Hydrophobic Nanosilica with Velocity Step Changes. Applied Sciences 2020, 10, 8127 .

AMA Style

Ebrahim H. Al-Ghurabi, Mohammad Asif, Nadavala Siva Kumar, Sher Afghan Khan. Fluidization Dynamics of Hydrophobic Nanosilica with Velocity Step Changes. Applied Sciences. 2020; 10 (22):8127.

Chicago/Turabian Style

Ebrahim H. Al-Ghurabi; Mohammad Asif; Nadavala Siva Kumar; Sher Afghan Khan. 2020. "Fluidization Dynamics of Hydrophobic Nanosilica with Velocity Step Changes." Applied Sciences 10, no. 22: 8127.

Review
Published: 17 July 2020 in RSC Advances
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Drug delivery technology has a wide spectrum, which is continuously being upgraded at a stupendous speed.

ACS Style

Yongtao Duan; Abhishek Dhar; Chetan Patel; Mehul Khimani; Swarnali Neogi; Prolay Sharma; Nadavala Siva Kumar; Rohit L. Vekariya. A brief review on solid lipid nanoparticles: part and parcel of contemporary drug delivery systems. RSC Advances 2020, 10, 26777 -26791.

AMA Style

Yongtao Duan, Abhishek Dhar, Chetan Patel, Mehul Khimani, Swarnali Neogi, Prolay Sharma, Nadavala Siva Kumar, Rohit L. Vekariya. A brief review on solid lipid nanoparticles: part and parcel of contemporary drug delivery systems. RSC Advances. 2020; 10 (45):26777-26791.

Chicago/Turabian Style

Yongtao Duan; Abhishek Dhar; Chetan Patel; Mehul Khimani; Swarnali Neogi; Prolay Sharma; Nadavala Siva Kumar; Rohit L. Vekariya. 2020. "A brief review on solid lipid nanoparticles: part and parcel of contemporary drug delivery systems." RSC Advances 10, no. 45: 26777-26791.

Journal article
Published: 09 July 2020 in Processes
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The processing of fine and ultrafine particles using a fluidized bed is challenging in view of their unpredictable hydrodynamic behavior due to interparticle forces. The use of assisted fluidization techniques in such cases can be effective in improving the bed hydrodynamics. This work investigates the dynamics of pulsed fluidized bed of ultrafine nanosilica subjected to square-wave flow pulsations. The pulse duration used in this study is sufficient to allow the complete collapse of the pulsed fluidized bed between two consecutive flow pulsations. The proposed pulsation strategy is carefully implemented using electronic mass flow controllers with the help of analog output signals from data acquisition system. Given that the different regions of the fluidized bed exhibit varying dynamics, which together contribute to overall bed dynamics, the bed transients in the upper, central, and lower regions of the fluidized bed are monitored using several sensitive pressure transducers located along the height of the bed. The effect of the flow pulsation on the hydrodynamics of the fluidized bed is rigorously characterized. A significant reduction in the minimum fluidization velocity was obtained and an increase in the bed homogeneity was observed due to flow pulsations. The frequency domain analysis of the signals clearly delineated the frequency of the various events occurring during the fluidization.

ACS Style

Mohammad Asif; Ebrahim H. Al-Ghurabi; Abdelhamid Ajbar; Nadavala Siva Kumar. Hydrodynamics of Pulsed Fluidized Bed of Ultrafine Powder: Fully Collapsing Fluidized Bed. Processes 2020, 8, 807 .

AMA Style

Mohammad Asif, Ebrahim H. Al-Ghurabi, Abdelhamid Ajbar, Nadavala Siva Kumar. Hydrodynamics of Pulsed Fluidized Bed of Ultrafine Powder: Fully Collapsing Fluidized Bed. Processes. 2020; 8 (7):807.

Chicago/Turabian Style

Mohammad Asif; Ebrahim H. Al-Ghurabi; Abdelhamid Ajbar; Nadavala Siva Kumar. 2020. "Hydrodynamics of Pulsed Fluidized Bed of Ultrafine Powder: Fully Collapsing Fluidized Bed." Processes 8, no. 7: 807.

Journal article
Published: 19 June 2020 in Nanomaterials
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The demand for eco-friendly renewable energy resources as energy storage and management devices is increased due to their high-power density and fast charge/discharge capacity. Recently, supercapacitors have fascinated due to their fast charge–discharge capability and high-power density along with safety. Herein, the authors present the synthesis of 3D-hierarchical peony-like ZnCo2O4 structures with 2D-nanoflakes by a hydrothermal method using polyvinylpyrrolidone. The reaction time was modified to obtain two samples (ZCO-6h and ZCO-12h) and the rest of the synthesis conditions were the same. The synthesized structures were systematically studied through various techniques: their crystalline characteristics were studied through XRD analysis, their morphologies were inspected through SEM and TEM, and the elemental distribution and oxidation states were studied by X-ray photoelectron spectroscopy (XPS). ZCO-12h sample has a larger surface area (55.40 m2·g−1) and pore size (24.69 nm) than ZCO-6h, enabling high-speed transport of ions and electrons. The ZCO-12h electrode showed a high-specific capacitance of 421.05 F·g−1 (31.52 C·g−1) at 1 A·g−1 and excellent cycle performance as measured by electrochemical analysis. Moreover, the morphologic characteristics of the prepared hierarchical materials contributed significantly to the improvement of specific capacitance. The excellent capacitive outcomes recommend the 3D-ZnCo2O4 hierarchical peony-like structures composed of 2D-nanoflakes as promising materials for supercapacitors with high-performance.

ACS Style

Gutturu Rajasekhara Reddy; Nadavala Siva Kumar; Borelli Deva Prasad Raju; Gnanendra Shanmugam; Ebrahim H. Al-Ghurabi; Mohammad Asif. Enhanced Supercapacitive Performance of Higher-Ordered 3D-Hierarchical Structures of Hydrothermally Obtained ZnCo2O4 for Energy Storage Devices. Nanomaterials 2020, 10, 1206 .

AMA Style

Gutturu Rajasekhara Reddy, Nadavala Siva Kumar, Borelli Deva Prasad Raju, Gnanendra Shanmugam, Ebrahim H. Al-Ghurabi, Mohammad Asif. Enhanced Supercapacitive Performance of Higher-Ordered 3D-Hierarchical Structures of Hydrothermally Obtained ZnCo2O4 for Energy Storage Devices. Nanomaterials. 2020; 10 (6):1206.

Chicago/Turabian Style

Gutturu Rajasekhara Reddy; Nadavala Siva Kumar; Borelli Deva Prasad Raju; Gnanendra Shanmugam; Ebrahim H. Al-Ghurabi; Mohammad Asif. 2020. "Enhanced Supercapacitive Performance of Higher-Ordered 3D-Hierarchical Structures of Hydrothermally Obtained ZnCo2O4 for Energy Storage Devices." Nanomaterials 10, no. 6: 1206.

Paper
Published: 17 April 2020 in RSC Advances
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Metal-free imidazolium-based ionic liquid (IL) Brønsted acids 1-methyl imidazolium hydrogen sulphate [HMIM]HSO4 and 1-methyl benzimidazolium hydrogen sulphate [HMBIM]HSO4 were synthesized.

ACS Style

Abhishek Dhar; Nadavala Siva Kumar; Mehul Khimani; Ahmed S. Al-Fatesh; Ahmed A. Ibrahim; Anis H. Fakeeha; Hiren Patel; Rohit L. Vekariya. Silica-immobilized ionic liquid Brønsted acids as highly effective heterogeneous catalysts for the isomerization of n-heptane and n-octane. RSC Advances 2020, 10, 15282 -15292.

AMA Style

Abhishek Dhar, Nadavala Siva Kumar, Mehul Khimani, Ahmed S. Al-Fatesh, Ahmed A. Ibrahim, Anis H. Fakeeha, Hiren Patel, Rohit L. Vekariya. Silica-immobilized ionic liquid Brønsted acids as highly effective heterogeneous catalysts for the isomerization of n-heptane and n-octane. RSC Advances. 2020; 10 (26):15282-15292.

Chicago/Turabian Style

Abhishek Dhar; Nadavala Siva Kumar; Mehul Khimani; Ahmed S. Al-Fatesh; Ahmed A. Ibrahim; Anis H. Fakeeha; Hiren Patel; Rohit L. Vekariya. 2020. "Silica-immobilized ionic liquid Brønsted acids as highly effective heterogeneous catalysts for the isomerization of n-heptane and n-octane." RSC Advances 10, no. 26: 15282-15292.

Journal article
Published: 23 February 2020 in Nanomaterials
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Low-frequency flow pulsations were utilized to improve the hydrodynamics of the fluidized bed of hydrophilic ultrafine nanosilica powder with strong agglomeration behavior. A gradual fluidization of unassisted fluidized bed through stepwise velocity change was carried out over a wide range of velocities followed by a gradual defluidization process. Bed dynamics in different regions of the fluidized bed were carefully monitored using fast and sensitive pressure transducers. Next, 0.05-Hz square-wave flow pulsation was introduced, and the fluidization behavior of the pulsed fluidized bed was rigorously characterized to delineate its effect on the bed hydrodynamics by comparing it with one of the unassisted fluidized bed. Flow pulsations caused a substantial decrease in minimum fluidization velocity and effective agglomerate diameter. The frequencies and amplitudes of various events in different fluidized bed regions were determined by performing frequency domain analysis on real-time bed transient data. The pulsations and their effects promoted deagglomeration and improved homogeneity of the pulsed fluidized bed.

ACS Style

Ebrahim H. Al-Ghurabi; Mohammed Shahabuddin; Nadavala Siva Kumar; Mohammad Asif. Deagglomeration of Ultrafine Hydrophilic Nanopowder Using Low-Frequency Pulsed Fluidization. Nanomaterials 2020, 10, 388 .

AMA Style

Ebrahim H. Al-Ghurabi, Mohammed Shahabuddin, Nadavala Siva Kumar, Mohammad Asif. Deagglomeration of Ultrafine Hydrophilic Nanopowder Using Low-Frequency Pulsed Fluidization. Nanomaterials. 2020; 10 (2):388.

Chicago/Turabian Style

Ebrahim H. Al-Ghurabi; Mohammed Shahabuddin; Nadavala Siva Kumar; Mohammad Asif. 2020. "Deagglomeration of Ultrafine Hydrophilic Nanopowder Using Low-Frequency Pulsed Fluidization." Nanomaterials 10, no. 2: 388.

Journal article
Published: 18 February 2020 in Catalysts
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Dry reforming of methane (DRM) was studied in the light of Ni supported on 8%PO4 + ZrO2 catalysts. Cerium was used to modify the Ni active metal. Different percentage loadings of Ce (1%, 1.5%, 2%, 2.5%, 3%, and 5%) were tested. The wet incipient impregnation method was used for the preparation of all catalysts. The catalysts were activated at 700 °C for ½ h. The reactions were performed at 800 °C using a gas hourly space velocity of 28,000 mL (h·gcat)−1. X-ray diffraction (XRD), N2 physisorption, hydrogen temperature programmed reduction (H2-TPR), temperature programmed oxidation (TPO), temperature programmed desorption (TPD), and thermogravimetric analysis (TGA) were used for characterizing the catalysts. The TGA analysis depicted minor amounts of carbon deposition. The CO2-TPD results showed that Ce enhanced the basicity of the catalysts. The 3% Ce loading possessed the highest surface area, the largest pore volume, and the greatest pore diameter. All the promoted catalysts enhanced the conversions of CH4 and CO2. Among the promoted catalysts tested, the 10Ni + 3%Ce/8%PO4 + ZrO2 catalyst system operated at 1 bar and at 800 °C gave the highest conversions of CH4 (95%) and CO2 (96%). The stability profile of Cerium-modified catalysts (10%Ni/8%PO4 + ZrO2) depicted steady CH4 and CO2 conversions during the 7.5 h time on stream.

ACS Style

Ahmed A. Ibrahim; Ahmed S. Al-Fatesh; Nadavala Siva Kumar; Ahmed E. Abasaeed; Samsudeen O. Kasim; Anis H. Fakeeha. Dry Reforming of Methane Using Ce-modified Ni Supported on 8%PO4 + ZrO2 Catalysts. Catalysts 2020, 10, 242 .

AMA Style

Ahmed A. Ibrahim, Ahmed S. Al-Fatesh, Nadavala Siva Kumar, Ahmed E. Abasaeed, Samsudeen O. Kasim, Anis H. Fakeeha. Dry Reforming of Methane Using Ce-modified Ni Supported on 8%PO4 + ZrO2 Catalysts. Catalysts. 2020; 10 (2):242.

Chicago/Turabian Style

Ahmed A. Ibrahim; Ahmed S. Al-Fatesh; Nadavala Siva Kumar; Ahmed E. Abasaeed; Samsudeen O. Kasim; Anis H. Fakeeha. 2020. "Dry Reforming of Methane Using Ce-modified Ni Supported on 8%PO4 + ZrO2 Catalysts." Catalysts 10, no. 2: 242.

Research article
Published: 01 February 2020 in Molecular Plant-Microbe Interactions®
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Elsinoë fawcettii and E. australis (phylum Ascomycota) are phytopathogenic fungi causing scab diseases on citrus plants. We report here the high-quality draft genome sequences and ab initio gene predictions of two E. fawcettii strains and one E. australis strain, which differ in their host range. This genome sequence information will provide valuable resources to underpin genomic attributes for determining host range through comparative genomic analyses of citrus scab fungi.

ACS Style

Gnanendra Shanmugam; Junhyun Jeon; Jae-Wook Hyun. Draft Genome Sequences of Elsinoë fawcettii and Elsinoë australis Causing Scab Diseases on Citrus. Molecular Plant-Microbe Interactions® 2020, 33, 135 -137.

AMA Style

Gnanendra Shanmugam, Junhyun Jeon, Jae-Wook Hyun. Draft Genome Sequences of Elsinoë fawcettii and Elsinoë australis Causing Scab Diseases on Citrus. Molecular Plant-Microbe Interactions®. 2020; 33 (2):135-137.

Chicago/Turabian Style

Gnanendra Shanmugam; Junhyun Jeon; Jae-Wook Hyun. 2020. "Draft Genome Sequences of Elsinoë fawcettii and Elsinoë australis Causing Scab Diseases on Citrus." Molecular Plant-Microbe Interactions® 33, no. 2: 135-137.

Research article
Published: 08 November 2019 in International Journal of Energy Research
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Naturally available neem tree gum consisting of bioelectrolyte and bioelectrode was fabricated for flexible energy storage device. Structural morphology, thermal stability, porosity and surface area of as prepared bioelectrode were characterized thoroughly by using scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and Brunauer–Emmett–Teller (BET) isotherm respectively. The bioelectrolyte conductivity was optimized under various concentrations of lithium ion salts and temperatures through electrochemical impedance spectroscopy (EIS). A flexible supercapacitor (SCs) was fabricated by using bioelectrodes and electrolyte and tested for its electrochemical properties. The supercapacitor displayed specific capacitance of 640 Fg‐1 and 200 Fg‐1 at a current density 0.5 Ag‐1 and 1.0 V operating potential window. The energy device has also demonstrated large operational window (2.0 V) and shown 102 Fg‐1 at a current density of 1.0 Ag‐1. The novelty of the present work lies in the simplified, cost‐effective procedure for preparation of biomaterials, their remarkably high stability under strong mechanical bent and long‐term charging‐discharging cycles of the fabricated device.

ACS Style

Abhishek Dhar; Nadavala Siva Kumar; Mehul Khimani; Ahmed S. Al‐Fatesh; Ahmed A. Ibrahim; Anish H. Fakeeha; Poonam Bhadja; Rohit L. Vekariya. Naturally occurring neem gum: An unprecedented green resource for bioelectrochemical flexible energy storage device. International Journal of Energy Research 2019, 44, 913 -924.

AMA Style

Abhishek Dhar, Nadavala Siva Kumar, Mehul Khimani, Ahmed S. Al‐Fatesh, Ahmed A. Ibrahim, Anish H. Fakeeha, Poonam Bhadja, Rohit L. Vekariya. Naturally occurring neem gum: An unprecedented green resource for bioelectrochemical flexible energy storage device. International Journal of Energy Research. 2019; 44 (2):913-924.

Chicago/Turabian Style

Abhishek Dhar; Nadavala Siva Kumar; Mehul Khimani; Ahmed S. Al‐Fatesh; Ahmed A. Ibrahim; Anish H. Fakeeha; Poonam Bhadja; Rohit L. Vekariya. 2019. "Naturally occurring neem gum: An unprecedented green resource for bioelectrochemical flexible energy storage device." International Journal of Energy Research 44, no. 2: 913-924.

Journal article
Published: 30 October 2019 in Nanomaterials
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Decoration of 2D semiconductor structures with heterogeneous metal quantum dots has attracted considerable attention due to advanced optical, electrical, and catalytic properties that result from the large surface-to-volume ratio associated with these structures. Herein, we report on silver quantum dot decorated 2D SnO2 nanoflakes for the photocatalytic abatement of water effluents, the synthesis of which was achieved through a straightforward and mild hydrothermal procedure. The photocatalysts were systematically investigated using UV–Vis, XRD, electron microscopy (SEM, HR-TEM), EDX, XPS and FTIR. The photocatalytic activity of the nanostructures was evaluated for the abatement of water pollutant rhodamine B (RhB), under light irradiation. The mild hydrothermal synthesis (100 °C) proved highly efficient for the production of large scale Ag quantum dot (QD)/SnO2 nanoflakes for a novel photocatalytic application. The decoration of SnO2 with Ag QDs significantly enhances the synergetic charge transfer, which diminishes the photo-induced electron-hole reunion. Moreover, the plasmonic effect from Ag QDs and 2D-SnO2 structures acts as an electron tank to collect the photo-induced electrons, generating a Schottky barrier between the SnO2 structures and quantum dots. Overall, this resulted in a facile and efficient degradation of RhB, with a rate double that of pristine SnO2.

ACS Style

Nadavala Siva Kumar; Mohammad Asif; T. Ranjeth Kumar Reddy; Gnanendra Shanmugam; Abdelhamid Ajbar. Silver Quantum Dot Decorated 2D-SnO2 Nanoflakes for Photocatalytic Degradation of the Water Pollutant Rhodamine B. Nanomaterials 2019, 9, 1536 .

AMA Style

Nadavala Siva Kumar, Mohammad Asif, T. Ranjeth Kumar Reddy, Gnanendra Shanmugam, Abdelhamid Ajbar. Silver Quantum Dot Decorated 2D-SnO2 Nanoflakes for Photocatalytic Degradation of the Water Pollutant Rhodamine B. Nanomaterials. 2019; 9 (11):1536.

Chicago/Turabian Style

Nadavala Siva Kumar; Mohammad Asif; T. Ranjeth Kumar Reddy; Gnanendra Shanmugam; Abdelhamid Ajbar. 2019. "Silver Quantum Dot Decorated 2D-SnO2 Nanoflakes for Photocatalytic Degradation of the Water Pollutant Rhodamine B." Nanomaterials 9, no. 11: 1536.

Journal article
Published: 16 October 2019 in Processes
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The present work discusses the adsorptive removal of a phenolic pollutant, i.e., 2,4,6-trichlorophenol (TCP), using low cost untreated agricultural waste pine cone powder (PCP). The present biosorbent was thoroughly characterized with the help of FTIR, SEM, XRD, and CHN analysis. The presence of amine (-NH2), hydroxyl (-OH) and carbonyl (C=O) functional groups was detected by the FTIR analysis. The important biosorption factors like agitation time, biomass dosage, initial adsorbate concentration, and the initial pH were examined by batch studies. The biosorption kinetic process was fast, reaching equilibrium in 75 min. The experimental kinetic data revealed an excellent agreement with the pseudo second order (PSO) model. On the other hand, the Langmuir isotherm model best described the equilibrium data with the maximum biosorption capacity (qmax) of 243.90 mg/g. These values are better than the adsorption capacities of most agro-based untreated adsorbents previously reported in the literature. Owing to fast removal rates and high biosorption capacity, PCP can be used for cost-effective treatment of TCP from aqueous streams.

ACS Style

Nadavala Siva Kumar; Mohammad Asif; Anesh Manjaly Poulose; Madala Suguna; Mansour I. Al-Hazza. Equilibrium and Kinetic Studies of Biosorptive Removal of 2,4,6-Trichlorophenol from Aqueous Solutions Using Untreated Agro-Waste Pine Cone Biomass. Processes 2019, 7, 757 .

AMA Style

Nadavala Siva Kumar, Mohammad Asif, Anesh Manjaly Poulose, Madala Suguna, Mansour I. Al-Hazza. Equilibrium and Kinetic Studies of Biosorptive Removal of 2,4,6-Trichlorophenol from Aqueous Solutions Using Untreated Agro-Waste Pine Cone Biomass. Processes. 2019; 7 (10):757.

Chicago/Turabian Style

Nadavala Siva Kumar; Mohammad Asif; Anesh Manjaly Poulose; Madala Suguna; Mansour I. Al-Hazza. 2019. "Equilibrium and Kinetic Studies of Biosorptive Removal of 2,4,6-Trichlorophenol from Aqueous Solutions Using Untreated Agro-Waste Pine Cone Biomass." Processes 7, no. 10: 757.

Journal article
Published: 03 October 2019 in Biological Control
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Ginseng (Panax ginseng Meyer) is one of the most important perennial medicinal plants. Ginseng is vulnerable to life-threatening diseases like root rot, blight, damping off, and spotting diseases because of its long cultivation period. Chemical control has numerous drawbacks for the plant and environment. Therefore, there is an immediate demand to replace the chemical agents with biological agents. We isolated and screened the bacterial endophytes from mountain-cultivated ginseng plants to use as them as biocontrol agents against ginseng pathogens. The bacterial endophyte Burkholderia stabilis EB159 (PG159, GenBank accession no. KU170189) was found to be the most effective against ginseng pathogens. Potential metabolites were isolated from a culture extract of PG159, and validated through spectral data analysis, which included UV, MS and NMR, and suggested that the role of pyrrolnitrin operates through the chromosomal prnABCD operon (5.59 kb). The whole genome sequence of PG159 showed significant similarity to those of the two available strains of B. stabilis. Overall, PG159 has great potential as a biocontrol agent against ginseng pathogens.

ACS Style

Hoki Kim; Tapan Kumar Mohanta; Young-Hwan Park; Soo-Chul Park; Gnanendra Shanmugam; Jin-Soo Park; Junhyun Jeon; Hanhong Bae. Complete genome sequence of the mountain-cultivated ginseng endophyte Burkholderia stabilis and its antimicrobial compounds against ginseng root rot disease. Biological Control 2019, 140, 104126 .

AMA Style

Hoki Kim, Tapan Kumar Mohanta, Young-Hwan Park, Soo-Chul Park, Gnanendra Shanmugam, Jin-Soo Park, Junhyun Jeon, Hanhong Bae. Complete genome sequence of the mountain-cultivated ginseng endophyte Burkholderia stabilis and its antimicrobial compounds against ginseng root rot disease. Biological Control. 2019; 140 ():104126.

Chicago/Turabian Style

Hoki Kim; Tapan Kumar Mohanta; Young-Hwan Park; Soo-Chul Park; Gnanendra Shanmugam; Jin-Soo Park; Junhyun Jeon; Hanhong Bae. 2019. "Complete genome sequence of the mountain-cultivated ginseng endophyte Burkholderia stabilis and its antimicrobial compounds against ginseng root rot disease." Biological Control 140, no. : 104126.

Journal article
Published: 28 August 2019 in Scientific Reports
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Recently, bacterial endophytes (BEs) have gained importance in the agricultural sector for their use as biocontrol agents to manage plant pathogens. Outbreak of the pine wilt disease (PWD) in Korea has led researchers to test the feasibility of BEs in controlling the pine wood nematode (PWN) Bursaphelenchus xylophilus. In this study, we have reported the diversity and biocontrol activity of BEs against the PWN. By employing a culture-dependent approach, 1,622 BEs were isolated from the needle, stem, and root tissues of P. densiflora, P. rigida, P. thunbergii, and P. koraiensis across 18 sampling sites in Korea. We classified 389 members based on 16S rDNA analysis and taxonomic binning, of which, 215 operational taxonomic units (OTUs) were determined. Using Shannon’s indices, diversity across the Pinus species and tissues was estimated to reveal the composition of BEs and their tissue-specific preferences. When their ethyl acetate crude extracts were analysed for biocontrol activity, 44 candidates with nematicidal activity were obtained. Among these, Stenotrophomonas and Bacillus sp. exhibited significant inhibitory activity against PWN during their developmental stages. Altogether, our study furnishes a basic comprehension of bacterial communities found in the Pinus species and highlights the potential of BEs as biocontrol agents to combat PWD.

ACS Style

Lakshmi Narayanan Ponpandian; Soon Ok Rim; Gnanendra Shanmugam; Junhyun Jeon; Young-Hwan Park; Sun-Keun Lee; Hanhong Bae. Phylogenetic characterization of bacterial endophytes from four Pinus species and their nematicidal activity against the pine wood nematode. Scientific Reports 2019, 9, 1 -11.

AMA Style

Lakshmi Narayanan Ponpandian, Soon Ok Rim, Gnanendra Shanmugam, Junhyun Jeon, Young-Hwan Park, Sun-Keun Lee, Hanhong Bae. Phylogenetic characterization of bacterial endophytes from four Pinus species and their nematicidal activity against the pine wood nematode. Scientific Reports. 2019; 9 (1):1-11.

Chicago/Turabian Style

Lakshmi Narayanan Ponpandian; Soon Ok Rim; Gnanendra Shanmugam; Junhyun Jeon; Young-Hwan Park; Sun-Keun Lee; Hanhong Bae. 2019. "Phylogenetic characterization of bacterial endophytes from four Pinus species and their nematicidal activity against the pine wood nematode." Scientific Reports 9, no. 1: 1-11.