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This Mini-Review provides the fundamentals and the state-of-the-art overview on geopolymers, novel inorganic polymeric materials (also known as alkali-bounded ceramics), synthesized from aluminosilicate sources and explores their current and potential sustainable environmental applications. It summarizes and examines concisely the recent scientific advances on geopolymers widely synthesized from abundantly available fly-ash-based aluminosilicate materials via alkaline activation at relatively low temperatures. Although geopolymerization is not a new concept and has offered valuable solutions to some environmental challenges as a low-cost and environmentally benign alternative to conventional energy-intensive Portland cement-based construction materials and has also been used as a barrier in immobilizing toxic and radioactive metals, the application of this technology to produce effective adsorptive materials for mitigation of liquid- and gas-phase contaminants is relatively recent. The valorization of the fly-ash waste in the sustainable and cost-effective development of geopolymeric adsorbents and catalysts for the treatment and control of environmental contaminants and energy production and storage could lead to many economic benefits due to the low cost and resource recycling of this globally abundant raw material. Perspectives on the synthesis and utilization of new geopolymer-based adsorbents for environmental and energy applications with insights into future research directions, prospects, and challenges for economic large-scale production are addressed.
Yusuf G. Adewuyi. Recent Advances in Fly-Ash-Based Geopolymers: Potential on the Utilization for Sustainable Environmental Remediation. ACS Omega 2021, 6, 15532 -15542.
AMA StyleYusuf G. Adewuyi. Recent Advances in Fly-Ash-Based Geopolymers: Potential on the Utilization for Sustainable Environmental Remediation. ACS Omega. 2021; 6 (24):15532-15542.
Chicago/Turabian StyleYusuf G. Adewuyi. 2021. "Recent Advances in Fly-Ash-Based Geopolymers: Potential on the Utilization for Sustainable Environmental Remediation." ACS Omega 6, no. 24: 15532-15542.
As a result of energy-related anthropogenic emissions to the atmosphere, greenhouse gases (GHG) like CO2 observed to be the most abundant continue to accumulate in the atmosphere at an alarming rate, with concomitant rise in its environmental impact; and hence, spurring research in technologies to mitigate climate change. This comprehensive review provides the state-of-the-art of CO2 capture using adsorbents prepared from various waste materials, which are categorized on the basis of their generation processes such as pyrolysis, combustion, smelting, and petroleum-related upgrading. These include biomass waste, sludge, polymer wastes, by-product of fuel and waste combustion processes such as fly ash and other biomass-based ashes, and byproducts of smelting and petroleum processes such as red mud, steel and iron slag, carbide slag, and petroleum and coal residues. In general, biomass waste derived adsorbents (up to 21 mmol/g and 3900 m2/g), and petroleum and coal-based sorbents (160–900 mg/g and 850 to 3800 m2/g) exhibited the highest CO2 adsorption capacities and the highest surface areas. The technological and economic feasibilities of these waste-derived sorbents for the simultaneous removal of multicomponent pollutants (SOx, NOx, Hg and CO2) need to be further assessed in future studies, focusing on the development of more resistant and kinetically stable adsorbents using adsorption capacity, temperature and pressure as a design metrics; and techno-economic and life-cycle assessments to aid in the scale-up of adsorbents with outstanding laboratory-scale performances to industrial applications.
Friday O. Ochedi; Yangxian Liu; Yusuf G. Adewuyi. State-of-the-art review on capture of CO2 using adsorbents prepared from waste materials. Process Safety and Environmental Protection 2020, 139, 1 -25.
AMA StyleFriday O. Ochedi, Yangxian Liu, Yusuf G. Adewuyi. State-of-the-art review on capture of CO2 using adsorbents prepared from waste materials. Process Safety and Environmental Protection. 2020; 139 ():1-25.
Chicago/Turabian StyleFriday O. Ochedi; Yangxian Liu; Yusuf G. Adewuyi. 2020. "State-of-the-art review on capture of CO2 using adsorbents prepared from waste materials." Process Safety and Environmental Protection 139, no. : 1-25.
Equilibrium reactive distillation (RD) process simulation and economic evaluation were carried out for the esterification of complex mixtures of several fatty acids and water (representative of crude bio-oils) with n-butanol using Aspen PLUS process simulator and economic analyzer. Complete design and optimization were carried out using evolutionary techniques from simplest system to the most rigorous one with introduction of intermittent progressive complexity. Prior to distillation design, esterification reaction kinetics and binary/ternary interactions were analyzed using Aspen RGibbs reactor module and Property PLUS, respectively. Simple distillation column was designed and optimized to obtain the initial trial parameters to be used in RD simulation. UNIQUAC is used as base property method and reaction equilibria estimated by minimization of Gibbs free energy. Near atmospheric column pressure, reflux ratio of 0.95, distillate to feed ratio of 0.505 and total 18 stages were found to be optimum based on attainable reaction conversion, ester separation, heat duties, and capital and operating costs. The effects of n-butanol:acid feeding ratio and water percent in bio-oil and their relationship were also analyzed to predict n-butanol requirement. The results of this study, including the optimized parameters, could serve as design platforms for pyrolysis bio-oil upgradation to transportation fuels.
M. Arif Khan; Yusuf G. Adewuyi. Techno-economic modeling and optimization of catalytic reactive distillation for the esterification reactions in bio-oil upgradation. Chemical Engineering Research and Design 2019, 148, 86 -101.
AMA StyleM. Arif Khan, Yusuf G. Adewuyi. Techno-economic modeling and optimization of catalytic reactive distillation for the esterification reactions in bio-oil upgradation. Chemical Engineering Research and Design. 2019; 148 ():86-101.
Chicago/Turabian StyleM. Arif Khan; Yusuf G. Adewuyi. 2019. "Techno-economic modeling and optimization of catalytic reactive distillation for the esterification reactions in bio-oil upgradation." Chemical Engineering Research and Design 148, no. : 86-101.
Compared to land, the ocean is much richer in biomass resources. As an attempt to actively explore the utilization of these vast marine biomass resources, in this study, novel activated carbons were prepared from two representative seaweed species (sargassum and enteromorpha), and their efficiencies and mechanisms for Hg0 removal were evaluated in a fixed bed reactor. The effects of modification methods, modification temperatures and reaction temperatures on Hg0 removal were also studied. The experimental data were also tested with different adsorption kinetic models for the best fits, and standard thermodynamic parameters evaluated in order to elucidate Hg0 adsorption mechanisms. The results appear to reveal that the performances of seaweed biomass-based activated carbons (denoted SAC and EAC, respectively) for Hg0 removal, are by far more superior to those of seaweed biomass-based the same pyrolysis chars. The best activation temperature for both samples was found to be 800 °C (and hence denoted SAC-800 and EAC-800); and the Hg0 removal efficiency of both samples also increased with increasing reaction temperature. The kinetic results show that the Hg0 removal is controlled by the external mass transfer at 80 °C and controlled by the chemisorption at 120 °C and 160 °C. It was determined that the Hg0 process was a combination of physisorption and chemisorption; with the excellent physical properties (specific surface area and pore structure), and the surface active sites (C-Cl groups and oxygen species) responsible for the physisorption and chemisorption, respectively.
Ziyang Liu; Yusuf Adewuyi; Shuo Shi; Hui Chen; Ying Li; Dongjing Liu; Yangxian Liu. Removal of gaseous Hg0 using novel seaweed biomass-based activated carbon. Chemical Engineering Journal 2019, 366, 41 -49.
AMA StyleZiyang Liu, Yusuf Adewuyi, Shuo Shi, Hui Chen, Ying Li, Dongjing Liu, Yangxian Liu. Removal of gaseous Hg0 using novel seaweed biomass-based activated carbon. Chemical Engineering Journal. 2019; 366 ():41-49.
Chicago/Turabian StyleZiyang Liu; Yusuf Adewuyi; Shuo Shi; Hui Chen; Ying Li; Dongjing Liu; Yangxian Liu. 2019. "Removal of gaseous Hg0 using novel seaweed biomass-based activated carbon." Chemical Engineering Journal 366, no. : 41-49.
Mercury is a toxic and persistent environmental pollutant which has been recognized as a global threat to human health and our ecosystem because mercury bio-accumulates in the food chain and can be transformed into the more neurotoxic methylmercury. Among current and emerging abatement technologies for elemental mercury in flue gas, gas–solid heterogeneous oxidation is nowadays gaining increasing attention due to several inherent advantages. The catalysts and adsorbents are key materials that control the heterogeneous catalytic oxidation and adsorption of Hg0 from flue gas. Here we present a review of the recent developments on several catalysts and adsorbents, including noble metal-based catalysts, non-noble metal-based catalysts (transition metal oxides and selective catalytic reduction catalysts), activated carbon/coke-based sorbents, biochar-based sorbents, fly ash-based sorbents, mineral material-based sorbents and other novel catalysts. The key process parameters and kinetic reaction mechanisms and advantages and disadvantages of various emerging catalysts/adsorbents and technologies of Hg0 removal are described in detail.
Wei Yang; Yusuf G. Adewuyi; Arshad Hussain; Yangxian Liu. Recent developments on gas–solid heterogeneous oxidation removal of elemental mercury from flue gas. Environmental Chemistry Letters 2018, 17, 19 -47.
AMA StyleWei Yang, Yusuf G. Adewuyi, Arshad Hussain, Yangxian Liu. Recent developments on gas–solid heterogeneous oxidation removal of elemental mercury from flue gas. Environmental Chemistry Letters. 2018; 17 (1):19-47.
Chicago/Turabian StyleWei Yang; Yusuf G. Adewuyi; Arshad Hussain; Yangxian Liu. 2018. "Recent developments on gas–solid heterogeneous oxidation removal of elemental mercury from flue gas." Environmental Chemistry Letters 17, no. 1: 19-47.
This study evaluates the chemistry, kinetics, and mass transfer aspects of the removal of NO and SO2 simultaneously from flue gas induced by the combined heat and Fe2+ activation of aqueous persulfate. The work involves experimental studies and the development of a mathematical model utilizing a comprehensive reaction scheme for detailed process evaluation, and to validate the results of an experimental study at 30–70 °C, which demonstrated that both SO2 and Fe2+ improved NO removal, while the SO2 is almost completely removed. The model was used to correlate experimental data, predict reaction species and nitrogen-sulfur (N-S) product concentrations, to obtain new kinetic data, and to estimate mass transfer coefficient (KLa) for NO and SO2 at different temperatures. The model percent conversion results appear to fit the data remarkably well for both NO and SO2 in the temperature range of 30–70 °C. The conversions ranged from 43.2 to 76.5% and 98.9 to 98.1% for NO and SO2, respectively, in the 30–70 °C range. The model predictions at the higher temperature of 90 °C were 90.0 and 97.4% for NO and SO2, respectively. The model also predicted decrease in KLa for SO2 of 1.097 × 10−4 to 8.88 × 10−5 s−1 (30–90 °C) and decrease in KLa for NO of 4.79 × 10−2 to 3.67 × 10−2 s−1 (30–50 °C) but increase of 4.36 × 10−2 to 4.90 × 10−2 s−1 at higher temperatures (70–90 °C). This emerging sulfate-radical-based process could be applied to the treatment of flue gases from combustion sources.
Yusuf G. Adewuyi; Arif Khan. Simultaneous NO and SO2 removal by aqueous persulfate activated by combined heat and Fe2+: experimental and kinetic mass transfer model studies. Environmental Science and Pollution Research 2018, 27, 1186 -1201.
AMA StyleYusuf G. Adewuyi, Arif Khan. Simultaneous NO and SO2 removal by aqueous persulfate activated by combined heat and Fe2+: experimental and kinetic mass transfer model studies. Environmental Science and Pollution Research. 2018; 27 (2):1186-1201.
Chicago/Turabian StyleYusuf G. Adewuyi; Arif Khan. 2018. "Simultaneous NO and SO2 removal by aqueous persulfate activated by combined heat and Fe2+: experimental and kinetic mass transfer model studies." Environmental Science and Pollution Research 27, no. 2: 1186-1201.
Wen Xu; Yusuf G. Adewuyi; Yangxian Liu; Yan Wang. Removal of elemental mercury from flue gas using CuOx and CeO2 modified rice straw chars enhanced by ultrasound. Fuel Processing Technology 2018, 170, 21 -31.
AMA StyleWen Xu, Yusuf G. Adewuyi, Yangxian Liu, Yan Wang. Removal of elemental mercury from flue gas using CuOx and CeO2 modified rice straw chars enhanced by ultrasound. Fuel Processing Technology. 2018; 170 ():21-31.
Chicago/Turabian StyleWen Xu; Yusuf G. Adewuyi; Yangxian Liu; Yan Wang. 2018. "Removal of elemental mercury from flue gas using CuOx and CeO2 modified rice straw chars enhanced by ultrasound." Fuel Processing Technology 170, no. : 21-31.
The use of advanced oxidation processes (AOPs) to integrate flue gas treatments for SO, NO and Hg into a single process unit is rapidly gaining research attention. AOPs are processes that rely on the generation of mainly the hydroxyl radical. This work evaluates the effectiveness of the simultaneous removal of NO and SO from flue gas utilizing AOP induced by the combined heat and Fe activation of aqueous persulfate, and elucidates the reaction pathways. The results indicated that both SO in the flue gas and Fe in solution improved NO removal, while the SO is almost completely removed. Increased temperature led to increase in NO removal in the absence and presence of both Fe and SO, and in the absence of either SO or Fe, but the enhanced NO removal due to the presence of SO alone dominated at all temperatures. The removal of NO increased from 77.5% at 30 °C to 80.5% and 82.3% at 50 °C and 70 °C in the presence of SO alone, and from 35.3% to 62.7% and 81.2%, respectively, in the presence of Fe alone. However, in the presence of both SO and Fe, NO conversion is 46.2% at 30 °C, increased only slightly to 48.2% at 50 °C; but sharply increased to 78.7% at 70 °C compared to 63.9% for persulfate-only activation. Results suggest NO removal in the presence of SO is equally effective by heat-only or heat-Fe activation as the temperature increases. The results should be useful for future developments of advanced oxidation processes for flue gas treatments.
Yusuf G. Adewuyi; Nana Y. Sakyi; M. Arif Khan. Simultaneous removal of NO and SO2 from flue gas by combined heat and Fe2+ activated aqueous persulfate solutions. Chemosphere 2018, 193, 1216 -1225.
AMA StyleYusuf G. Adewuyi, Nana Y. Sakyi, M. Arif Khan. Simultaneous removal of NO and SO2 from flue gas by combined heat and Fe2+ activated aqueous persulfate solutions. Chemosphere. 2018; 193 ():1216-1225.
Chicago/Turabian StyleYusuf G. Adewuyi; Nana Y. Sakyi; M. Arif Khan. 2018. "Simultaneous removal of NO and SO2 from flue gas by combined heat and Fe2+ activated aqueous persulfate solutions." Chemosphere 193, no. : 1216-1225.
Enzymatic hydrolysis of cellulose has been studied using a novel multifrequency ultrasonic reactor. The optimum experimental conditions resulted in the percent glucose yield of 41.4% after 5 h using Avicel microcrystalline cellulose and cellulase + cellobiase enzymes at 50 °C and pH 5.2. It was found that the effect of ultrasound is mainly physical in nature and increased mass transfer because of increased surface area resulting from cellulose fragmentation in the presence of ultrasound was responsible for the observed increase in the glucose yield. The best cellulose hydrolysis was observed at 611 kHz and 104 W. Up to 70% glucose yield was obtained with prolonged time (40–50 h). The effects of ultrasound and enzyme on the surface and structure of the cellulose were studied using Brunauer–Emmett–Teller (BET) and X-ray diffraction (XRD).
Yusuf Gbadebo Adewuyi; Vishwanath Deshmane. Intensification of Enzymatic Hydrolysis of Cellulose Using High-Frequency Ultrasound: An Investigation of the Effects of Process Parameters on Glucose Yield. Energy & Fuels 2015, 29, 4998 -5006.
AMA StyleYusuf Gbadebo Adewuyi, Vishwanath Deshmane. Intensification of Enzymatic Hydrolysis of Cellulose Using High-Frequency Ultrasound: An Investigation of the Effects of Process Parameters on Glucose Yield. Energy & Fuels. 2015; 29 (8):4998-5006.
Chicago/Turabian StyleYusuf Gbadebo Adewuyi; Vishwanath Deshmane. 2015. "Intensification of Enzymatic Hydrolysis of Cellulose Using High-Frequency Ultrasound: An Investigation of the Effects of Process Parameters on Glucose Yield." Energy & Fuels 29, no. 8: 4998-5006.
The chemistry and kinetics of NO removal by aqueous solutions of sodium persulfate (Na2S2O8) simultaneously activated by temperature and Fe2+ were studied in a bubble reactor. Reaction pathways were proposed and a mathematical model utilizing the pseudo-steady-state-approximation technique and film theory of mass transfer were developed. The model was solved numerically using the fourth order Runge–Kutta method in Matlab to obtain species concentrations; correlate experimental data; and estimate mass transfer and kinetic rate parameters. The model was used to investigate the effects of Na2S2O8 (0.01–0.2 M), Fe2+ (0–0.1 M), gas-phase NO (500–1000 ppm) concentrations and temperatures (23–90 °C), and is a follow-up to an experimental study, which demonstrated that Fe2+ activation further improved NO conversion by ∼10% at all temperatures. The model results, which appeared to fit those of the experiments remarkably well, were discussed and predicted kinetic data compared with available literature values.
Yusuf G. Adewuyi; M. Arif Khan; Nana Y. Sakyi. Kinetics and Modeling of the Removal of Nitric Oxide by Aqueous Sodium Persulfate Simultaneously Activated by Temperature and Fe2+. Industrial & Engineering Chemistry Research 2013, 53, 828 -839.
AMA StyleYusuf G. Adewuyi, M. Arif Khan, Nana Y. Sakyi. Kinetics and Modeling of the Removal of Nitric Oxide by Aqueous Sodium Persulfate Simultaneously Activated by Temperature and Fe2+. Industrial & Engineering Chemistry Research. 2013; 53 (2):828-839.
Chicago/Turabian StyleYusuf G. Adewuyi; M. Arif Khan; Nana Y. Sakyi. 2013. "Kinetics and Modeling of the Removal of Nitric Oxide by Aqueous Sodium Persulfate Simultaneously Activated by Temperature and Fe2+." Industrial & Engineering Chemistry Research 53, no. 2: 828-839.
Nitric oxide (NO) removal by aqueous sodium persulfate (Na2S2O8) simultaneously activated by temperature and Fe2+ was studied in a lab-scale bubble reactor. The effects of Na2S2O8 (0.01–0.20 M), Fe2+ (0.00–0.10 M), gas-phase NO (500–1000 ppm) concentrations, and temperatures (23–90 °C) were investigated. NO fractional conversion at all temperatures with and without the presence of Fe2+ increased sharply with persulfate concentration up to about 0.10 M before leveling off. At 0.10 M Na2S2O8 and 0.01 M Fe2+ concentrations, conversions of up to 79% and approximately 100% were observed at 70 and 90 °C, respectively. Increased temperature led to increased conversions of NO at all persulfate levels, and activation by 0.01 M Fe2+ further improved NO conversion by ∼10% at all temperatures. The chemistry of NO removal and proposed reaction pathways are discussed. The results demonstrated the feasibility of improved NO aqueous scrubbing by temperature- and Fe2+-activated persulfate.
Yusuf G. Adewuyi; Nana Y. Sakyi. Removal of Nitric Oxide by Aqueous Sodium Persulfate Simultaneously Activated by Temperature and Fe2+ in a Lab-scale Bubble Reactor. Industrial & Engineering Chemistry Research 2013, 52, 14687 -14697.
AMA StyleYusuf G. Adewuyi, Nana Y. Sakyi. Removal of Nitric Oxide by Aqueous Sodium Persulfate Simultaneously Activated by Temperature and Fe2+ in a Lab-scale Bubble Reactor. Industrial & Engineering Chemistry Research. 2013; 52 (41):14687-14697.
Chicago/Turabian StyleYusuf G. Adewuyi; Nana Y. Sakyi. 2013. "Removal of Nitric Oxide by Aqueous Sodium Persulfate Simultaneously Activated by Temperature and Fe2+ in a Lab-scale Bubble Reactor." Industrial & Engineering Chemistry Research 52, no. 41: 14687-14697.
The absorption–oxidation of nitrogen oxide (NO) induced by aqueous solutions of sodium persulfate (Na2S2O8) in the presence of SO2 has been studied in a bubble column reactor operated in semibatch mode. The effects of Na2S2O8 concentration (0.01–0.20 M), temperature (23–70 °C), 1550 ppm gas-phase SO2, and solution pH on NO removal (1000 ppm gas-phase concentration) were investigated. The presence of SO2 dramatically improved NO gas absorption and oxidation while it was itself completely removed. The NO fractional conversions in the presence of SO2 ranged from 77% to 83%, with the greatest effect occurring at lower temperatures (23 and 30 °C). While persulfate concentration of 0.1 M appeared optimal for aqueous NO removal, both in the absence and presence of SO2, significant improvements in NO removal were observed for persulfate concentrations of >0.05 M but antagonistic effects were observed with concentrations of <0.05 M in the presence of SO2, compared to without SO2. The pH range of 6.5–8.5 appears to be ideal for NO removal in the presence of SO2. The individual and simultaneous chemistry of NOx and SO2 removal by persulfate is discussed. The results demonstrate the feasibility of removing NOx and SOx simultaneously by aqueous scrubbing.
Yusuf G. Adewuyi; Nana Y. Sakyi. Simultaneous Absorption and Oxidation of Nitric Oxide and Sulfur Dioxide by Aqueous Solutions of Sodium Persulfate Activated by Temperature. Industrial & Engineering Chemistry Research 2013, 52, 11702 -11711.
AMA StyleYusuf G. Adewuyi, Nana Y. Sakyi. Simultaneous Absorption and Oxidation of Nitric Oxide and Sulfur Dioxide by Aqueous Solutions of Sodium Persulfate Activated by Temperature. Industrial & Engineering Chemistry Research. 2013; 52 (33):11702-11711.
Chicago/Turabian StyleYusuf G. Adewuyi; Nana Y. Sakyi. 2013. "Simultaneous Absorption and Oxidation of Nitric Oxide and Sulfur Dioxide by Aqueous Solutions of Sodium Persulfate Activated by Temperature." Industrial & Engineering Chemistry Research 52, no. 33: 11702-11711.
Vishwanath Deshmane; Yusuf G. Adewuyi. Synthesis of thermally stable, high surface area, nanocrystalline mesoporous tetragonal zirconium dioxide (ZrO2): Effects of different process parameters. Microporous and Mesoporous Materials 2012, 148, 88 -100.
AMA StyleVishwanath Deshmane, Yusuf G. Adewuyi. Synthesis of thermally stable, high surface area, nanocrystalline mesoporous tetragonal zirconium dioxide (ZrO2): Effects of different process parameters. Microporous and Mesoporous Materials. 2012; 148 (1):88-100.
Chicago/Turabian StyleVishwanath Deshmane; Yusuf G. Adewuyi. 2012. "Synthesis of thermally stable, high surface area, nanocrystalline mesoporous tetragonal zirconium dioxide (ZrO2): Effects of different process parameters." Microporous and Mesoporous Materials 148, no. 1: 88-100.
Yusuf G. Adewuyi; Nymul Khan. Modeling the ultrasonic cavitation-enhanced removal of nitrogen oxide in a bubble column reactor. AIChE Journal 2011, 58, 2397 -2411.
AMA StyleYusuf G. Adewuyi, Nymul Khan. Modeling the ultrasonic cavitation-enhanced removal of nitrogen oxide in a bubble column reactor. AIChE Journal. 2011; 58 (8):2397-2411.
Chicago/Turabian StyleYusuf G. Adewuyi; Nymul Khan. 2011. "Modeling the ultrasonic cavitation-enhanced removal of nitrogen oxide in a bubble column reactor." AIChE Journal 58, no. 8: 2397-2411.
A new method for the determination of peroxydisulfate using ion chromatography has been developed. Elution of peroxydisulfate was effected by isocratic elution using 200 mM NaOH at 40°C. A modification of the method using gradient elution was able to simultaneously determine other common inorganic ions (nitrate, nitrite, sulfate and chloride) down to significantly low concentrations in a peroxydisulfate matrix. The relative standard deviations (RSD) were in the range of 0.5-5%, for peak areas and <0.2% for peak retention times. The recoveries were between 95% and 120% for a concentration range of about 0.5-42 ppm. The limit of detection for peroxydisulfate ion was 0.2 ppm and for the other ions were ≤2×10(-2) ppm. The calibration curves were linear with slope and intercepts close to 1 and 0, respectively.
Nymul Khan; Yusuf G. Adewuyi. A new method of analysis of peroxydisulfate using ion chromatography and its application to the simultaneous determination of peroxydisulfate and other common inorganic ions in a peroxydisulfate matrix. Journal of Chromatography A 2011, 1218, 392 -397.
AMA StyleNymul Khan, Yusuf G. Adewuyi. A new method of analysis of peroxydisulfate using ion chromatography and its application to the simultaneous determination of peroxydisulfate and other common inorganic ions in a peroxydisulfate matrix. Journal of Chromatography A. 2011; 1218 (3):392-397.
Chicago/Turabian StyleNymul Khan; Yusuf G. Adewuyi. 2011. "A new method of analysis of peroxydisulfate using ion chromatography and its application to the simultaneous determination of peroxydisulfate and other common inorganic ions in a peroxydisulfate matrix." Journal of Chromatography A 1218, no. 3: 392-397.
Two things are needed for any technology to be suitable for use in the industry, viz. 1. Technical feasibility and 2. Economical feasibility. The use of ultrasound for waste water treatment has been shown to be technically feasible by numerous reports in the literature over the years. But there are hardly any exhaustive reports which address the issue of economical feasibility of the use of ultrasound for waste water treatment on industrial scale. Hence an attempt was made to estimate the cost for the waste water treatment using ultrasound. The costs have been calculated for 1000 L/min capacity treatment plant. The costs were calculated based upon the rate constants for pollutant degradation. The pollutants considered were phenol, trichloroethylene (TCE) and reactive azo dyes. Time required for ninety percent degradation of pollutant was taken as the residence time. The amount of energy required to achieve the target degradation was calculated from the energy density (watt/ml) used in the treatability study. The cost of treatment was calculated by considering capital cost and operating cost involved for the waste water treatment. Quotations were invited from vendors to ascertain the capital cost of equipments involved and operating costs were calculated based on annual energy usage. The cost was expressed in dollars per 1000 gallons of waste water treated. These treatment costs were compared with other established Advanced Oxidation Process (AOP) technologies. The cost of waste water treatment for phenol was in the range of $89 per 1000 gallons for UV/US/O3 to $15,536 per 1000 gallons for US alone. These costs for TCE were in the range of $25 per 1000 gallons to $91 for US + UV treatment and US alone, respectively. The cost of waste water treatment for reactive azo dyes was in the range of $65 per 1000 gallon for US + UV + H2O2 to $14,203 per 1000 gallon for US alone. This study should help in quantifying the economics of waste water treatment using ultrasound on industrial scale. We strongly believe that this study will immensely help the researchers working in the area of applications of ultrasound for waste water treatment in terms of where the technology stands today as compared to other available commercial AOP technologies. This will also help them think for different ways to improve the efficiency of using ultrasound or search for other ways of generating cavitation which may be more efficient and help reduce the cost of treatment in future.
Naresh Mahamuni; Yusuf G. Adewuyi. Advanced oxidation processes (AOPs) involving ultrasound for waste water treatment: A review with emphasis on cost estimation. Ultrasonics Sonochemistry 2010, 17, 990 -1003.
AMA StyleNaresh Mahamuni, Yusuf G. Adewuyi. Advanced oxidation processes (AOPs) involving ultrasound for waste water treatment: A review with emphasis on cost estimation. Ultrasonics Sonochemistry. 2010; 17 (6):990-1003.
Chicago/Turabian StyleNaresh Mahamuni; Yusuf G. Adewuyi. 2010. "Advanced oxidation processes (AOPs) involving ultrasound for waste water treatment: A review with emphasis on cost estimation." Ultrasonics Sonochemistry 17, no. 6: 990-1003.
An analytical method has been developed using Fourier transform infrared spectroscopy (FTIR) to determine biodiesel content in the reaction mixture to monitor the transesterification reaction. It is also shown that it can be used to determine biodiesel content in biodiesel−petrodiesel blends. The method with small modifications can also be used to determine the oil content in the adulteration of biodiesel−petrodiesel blends. Soybean oil is used as the model oil, and its methyl ester is used as biodiesel. The method uses a software viz. Enformatic FTIR Collection Manager (EFCM) to develop a calibration model and predict the concentration of biodiesel and oil. The software uses the nonlinear classical least square (CLS) method for calibration. It is shown that the method can be used to measure the amount of biodiesel accurately to the extent of 98.11% accuracy for biodiesel−oil mixtures and biodiesel content in the biodiesel−petrodiesel mixture (blend) with an accuracy of 99.99%. The method has also been used to determine the oil content and biodiesel content in the biodiesel−petrodiesel−oil mixture (blend adulteration) with an accuracy of about 95.32%.
Naresh Mahamuni; Yusuf G. Adewuyi. Fourier Transform Infrared Spectroscopy (FTIR) Method To Monitor Soy Biodiesel and Soybean Oil in Transesterification Reactions, Petrodiesel−Biodiesel Blends, and Blend Adulteration with Soy Oil. Energy & Fuels 2009, 23, 3773 -3782.
AMA StyleNaresh Mahamuni, Yusuf G. Adewuyi. Fourier Transform Infrared Spectroscopy (FTIR) Method To Monitor Soy Biodiesel and Soybean Oil in Transesterification Reactions, Petrodiesel−Biodiesel Blends, and Blend Adulteration with Soy Oil. Energy & Fuels. 2009; 23 (7):3773-3782.
Chicago/Turabian StyleNaresh Mahamuni; Yusuf G. Adewuyi. 2009. "Fourier Transform Infrared Spectroscopy (FTIR) Method To Monitor Soy Biodiesel and Soybean Oil in Transesterification Reactions, Petrodiesel−Biodiesel Blends, and Blend Adulteration with Soy Oil." Energy & Fuels 23, no. 7: 3773-3782.
The effects of sulfur dioxide (SO2), sodium chloride (NaCl), and peroxymonosulfate or oxone (2KHSO5·KHSO4·K2SO4 with active ingredient, HSO5-) on the sonochemical removal of nitric oxide (NO) have been studied in a bubble column reactor. The initial concentration of NO studied ranged from about 500 to 1040 ppm. NaCl in the concentration range of 0.01−0.5 M was used as the electrolyte to study the effect of ionic strength. At the low NaCl concentration (0.01 M), the percent fractional removal of NO with initial concentration of 1040 ppm was enhanced significantly, while as the NaCl concentration increased, the positive effects were less pronounced. The presence of ∼2520 ppm SO2 in combination with 0.01 M NaCl further enhanced NO removal. However, with a NO initial concentration of 490 ppm, the addition of NaCl was detrimental to NO removal at all NaCl concentration levels. The combinative effect of sonication and chemical oxidation using 0.005−0.05 M oxone was also studied. While the lower concentrations of HSO5- enhanced NO removal efficiency, higher concentrations were detrimental depending on the initial concentration of NO. It was also demonstrated that in the presence of ultrasound, the smallest concentration of oxone was needed to obtain optimal fractional conversion of NO.
Yusuf G. Adewuyi; Samuel O. Owusu. Ultrasound-Induced Aqueous Removal of Nitric Oxide from Flue Gases: Effects of Sulfur Dioxide, Chloride, and Chemical Oxidant. The Journal of Physical Chemistry A 2006, 110, 11098 -11107.
AMA StyleYusuf G. Adewuyi, Samuel O. Owusu. Ultrasound-Induced Aqueous Removal of Nitric Oxide from Flue Gases: Effects of Sulfur Dioxide, Chloride, and Chemical Oxidant. The Journal of Physical Chemistry A. 2006; 110 (38):11098-11107.
Chicago/Turabian StyleYusuf G. Adewuyi; Samuel O. Owusu. 2006. "Ultrasound-Induced Aqueous Removal of Nitric Oxide from Flue Gases: Effects of Sulfur Dioxide, Chloride, and Chemical Oxidant." The Journal of Physical Chemistry A 110, no. 38: 11098-11107.
Recent advances in advanced oxidation technologies for applications in environmental remediation involve the use of acoustic cavitation. Cavitation is the formation, growth, and implosive collapse of gas- or vapor-filled microbubbles formed from acoustical wave-induced compression/rarefaction in a body of liquid. Cavitation is effective in treating most liquid-phase pollutants but it is highly energy intensive and not economical or practically feasible when used alone. One of the most interesting topics in the recent advances in environmental sonochemistry is the intensification of the ultrasonic degradation process by coupling ultrasound with other types of energy, chemical oxidants, or photocataysts. In Part II of this series, a critical review of the applications of ultrasound in environmental remediation focusing on the simultaneous or hybrid use of ultrasonic irradiation and photocatalysis in aqueous solutions, namely, sonophotocatalytic oxidation processes, is presented.
Yusuf G. Adewuyi. Sonochemistry in Environmental Remediation. 2. Heterogeneous Sonophotocatalytic Oxidation Processes for the Treatment of Pollutants in Water. Environmental Science & Technology 2005, 39, 8557 -8570.
AMA StyleYusuf G. Adewuyi. Sonochemistry in Environmental Remediation. 2. Heterogeneous Sonophotocatalytic Oxidation Processes for the Treatment of Pollutants in Water. Environmental Science & Technology. 2005; 39 (22):8557-8570.
Chicago/Turabian StyleYusuf G. Adewuyi. 2005. "Sonochemistry in Environmental Remediation. 2. Heterogeneous Sonophotocatalytic Oxidation Processes for the Treatment of Pollutants in Water." Environmental Science & Technology 39, no. 22: 8557-8570.
Sonoprocessing is the utilization of sonic and ultrasonic waves in chemical synthesis and processes. It is a new and rapidly growing research field with broad applications in environmental engineering, green chemical synthesis, and processing. The application of this environmentally benign technique in environmental remediation is currently under active research and development. Sonochemical oxidation is effective in treating toxic effluents and reducing toxicity. However, the ultrasonic treatment is highly energy intensive since sonication is relatively inefficient with respect to total input energy and is therefore not economically attractive or feasible alone. Hence, sonochemistry has not yet received much attention as an alternative for industrial and large-scale chemical and environmental processes. One of the most interesting topics in the recent advances in sonochemistry is the possibility of double or more excitations with ultrasound and other types of energy. The coupling of ultrasound with other free energy sources (i.e., UV) or chemical oxidation utilizing H2O2, O3, or ferrous ion presents interesting and attractive approaches. Therefore, many recent efforts have been devoted to improving the efficiency of sonochemical reactions by exploiting the advantages of combinative or hybrid processes involving the simultaneous or sequential use of ultrasonic irradiation and other advanced oxidation processes, electrochemical processes, and biological treatment. This paper provides a critical review of the applications of ultrasound in environmental remediation, focusing on recent developments and unifying analysis of combinative or hybrid systems, namely, sonophotochemical oxidation processes.
Yusuf G. Adewuyi. Sonochemistry in Environmental Remediation. 1. Combinative and Hybrid Sonophotochemical Oxidation Processes for the Treatment of Pollutants in Water. Environmental Science & Technology 2005, 39, 3409 -3420.
AMA StyleYusuf G. Adewuyi. Sonochemistry in Environmental Remediation. 1. Combinative and Hybrid Sonophotochemical Oxidation Processes for the Treatment of Pollutants in Water. Environmental Science & Technology. 2005; 39 (10):3409-3420.
Chicago/Turabian StyleYusuf G. Adewuyi. 2005. "Sonochemistry in Environmental Remediation. 1. Combinative and Hybrid Sonophotochemical Oxidation Processes for the Treatment of Pollutants in Water." Environmental Science & Technology 39, no. 10: 3409-3420.