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This research is to study the preparation of graphene-monodispersed polypyrrole composite materials for uses as a counter electrode in dye-sensitized solar cells (DSSCs). The preparation started with the synthesis of graphene oxide (GO), followed by the preparation of composite films by polymerization method and the GO reduction process by ascorbic acid. The characterizations included thermal-gravimetric analysis (TGA), fourier transform infrared spectroscopy (FTIR), raman spectroscopy, X-ray diffraction (XRD), field-emission electron microscopy (FESEM) and cyclic voltammetry (CV). The DSSCs’ efficiency tests were also conducted and analyzed. Based on the test results, it was found that DSSCs prepared from PPy/RGO-5 composite films with 5% by weight of reduced graphene oxide (RGO) could give an optimal efficiency. Nevertheless, the efficiency of such solar cells was much less than that of DSSCs with platinum counter electrode. This could be due to incomplete reduction of graphene oxide, resulting low electron transfer ability and electrocatalytic activity toward the reduction of electrolyte solution.
Vorrada Loryuenyong; Anucha Khadthiphong; Jirapan Phinkratok; Jeerawat Watwittayakul; Woradetch Supawattanakul; Achanai Buasri. The fabrication of graphene-polypyrrole composite for application with dye-sensitized solar cells. Materials Today: Proceedings 2019, 17, 1675 -1681.
AMA StyleVorrada Loryuenyong, Anucha Khadthiphong, Jirapan Phinkratok, Jeerawat Watwittayakul, Woradetch Supawattanakul, Achanai Buasri. The fabrication of graphene-polypyrrole composite for application with dye-sensitized solar cells. Materials Today: Proceedings. 2019; 17 ():1675-1681.
Chicago/Turabian StyleVorrada Loryuenyong; Anucha Khadthiphong; Jirapan Phinkratok; Jeerawat Watwittayakul; Woradetch Supawattanakul; Achanai Buasri. 2019. "The fabrication of graphene-polypyrrole composite for application with dye-sensitized solar cells." Materials Today: Proceedings 17, no. : 1675-1681.
Nowadays, organo-lead halide is one of the most interesting materials for perovskite solar cells. This is because of its ease of fabrication, long absorption wavelength region, and long diffusion length. In this study, we investigated the bandgap tuning of hybrid mixed-halide perovskite films. The films were prepared by sequential two-step deposition technique, using 5-ammonium valeric acid iodide (5-AVAI), PbI2, and a mixture of CH3NH3I and CH3NH3Br as precursor solutions. The results confirmed the formation of 2D perovskites in the presence of 5-AVAI. The obtained films had higher moisture resistance, better surface coverage, and smaller grain size, compared to the films without 5-AVAI. With the introduction of Br− ions, the change in the lattice parameter was observed. The bandgap was also found to increase with increasing Br− content.
Vorrada Loryuenyong; Pajaree Thongpon; Sasathorn Saudmalai; Achanai Buasri. The Synthesis of 2D CH3NH3PbI3 Perovskite Films with Tunable Bandgaps by Solution Deposition Route. International Journal of Photoenergy 2019, 2019, 1 -7.
AMA StyleVorrada Loryuenyong, Pajaree Thongpon, Sasathorn Saudmalai, Achanai Buasri. The Synthesis of 2D CH3NH3PbI3 Perovskite Films with Tunable Bandgaps by Solution Deposition Route. International Journal of Photoenergy. 2019; 2019 ():1-7.
Chicago/Turabian StyleVorrada Loryuenyong; Pajaree Thongpon; Sasathorn Saudmalai; Achanai Buasri. 2019. "The Synthesis of 2D CH3NH3PbI3 Perovskite Films with Tunable Bandgaps by Solution Deposition Route." International Journal of Photoenergy 2019, no. : 1-7.
This research studied the preparation of titanium dioxide (TiO2) composite films with the incorporation of tin oxide and reduced graphene oxide (SnO2-RGO) for uses as photoanodes in dye-sensitized solar cells (DSSCs). The experimental procedure started with the synthesis of graphene oxide by Hummer's method, followed by the preparation of SnO2-RGO composite materials by hydrothermal process. The resultant SnO2-RGO was sequentially mixed with TiO2to prepare the composite films by doctor-blade method. The results indicated that the addition of graphene oxide into SnO2could reduce the band gap, avoid the agglomeration, and improve the dispersion of tin oxide particles (SnO2). According to the efficiency tests of the obtained photoanodes, a small amount of RGO could significantly affect the DSSC’s performance. Without RGO, TiO2-SnO2photoanodes exhibited very poor performance. This could be due to low dye-adsorption capability and low electron transfer ability. The addition of excess amount of RGO in photoanode could, however, lead to negative effects such as charge trapping and lower solar cell efficiency.
Vorrada Loryuenyong; Bodin Jindawattanawong; Panpaporn Jaroenkun; Apichat Supannakool; Achanai Buasri. The Fabrication of Titanium Dioxide-Tin Oxide/Reduced Graphene Oxide Photoanodes for Dye-Sensitized Solar Cells. Key Engineering Materials 2018, 780, 32 -36.
AMA StyleVorrada Loryuenyong, Bodin Jindawattanawong, Panpaporn Jaroenkun, Apichat Supannakool, Achanai Buasri. The Fabrication of Titanium Dioxide-Tin Oxide/Reduced Graphene Oxide Photoanodes for Dye-Sensitized Solar Cells. Key Engineering Materials. 2018; 780 ():32-36.
Chicago/Turabian StyleVorrada Loryuenyong; Bodin Jindawattanawong; Panpaporn Jaroenkun; Apichat Supannakool; Achanai Buasri. 2018. "The Fabrication of Titanium Dioxide-Tin Oxide/Reduced Graphene Oxide Photoanodes for Dye-Sensitized Solar Cells." Key Engineering Materials 780, no. : 32-36.
This research studied the fabrication of graphene-reinforced aluminum composite via powder metallurgy and uniaxial pressing. The process started from mixing graphene with aluminum powder with various content of graphene (0.5, 1, 1.5, 2 and 4 wt.%) in acetone medium, followed by dispersion process at high frequency using an ultrasonic bath. The mixed composite powders were then formed into pellet and sintered at 600°C. The results showed that when graphene content in graphene reinforced aluminum composite is low (0.5wt.%, 1wt.% and 1.5wt.%), the hardness was enhanced. It was suspected that graphene could get into aluminum matrix and impede the grain growth of aluminum and dislocation movement. However, when excessive graphene content was added, graphene nanoplatelets tended to agglomerate, decreasing the hardness of composite. Similarly, the improvement of electrical and thermal conductivities was achieved with a low content of graphene. The well dispersion of graphene in aluminum matrix could facilitate the electron transport and to induce the pore reduction throughout the matrix.
Achanai Buasri; Chudeth Prasanwon; Bhornwalan Boonsong; Pantira Kohprasert; Vorrada Loryuenyong. The Fabrication of Graphene-Reinforced Aluminum Composites by Powder Metallurgy and Uniaxial Pressing. Key Engineering Materials 2018, 780, 10 -14.
AMA StyleAchanai Buasri, Chudeth Prasanwon, Bhornwalan Boonsong, Pantira Kohprasert, Vorrada Loryuenyong. The Fabrication of Graphene-Reinforced Aluminum Composites by Powder Metallurgy and Uniaxial Pressing. Key Engineering Materials. 2018; 780 ():10-14.
Chicago/Turabian StyleAchanai Buasri; Chudeth Prasanwon; Bhornwalan Boonsong; Pantira Kohprasert; Vorrada Loryuenyong. 2018. "The Fabrication of Graphene-Reinforced Aluminum Composites by Powder Metallurgy and Uniaxial Pressing." Key Engineering Materials 780, no. : 10-14.
Nowadays, researchers have made attempts to seek for cost-effective and eco-friendly catalyst for transesterification reaction. One possible way to reduce the costs of the catalysts is to use biomass or industrial waste as catalytic materials. The use of waste materials as catalysts also reduces the cost of waste handling and disposal. The objective of this study was to investigate the potential of the low cost, environmentally friendly calcined marlstones to be a viable catalyst in the transesterification of Jatropha seed oil. The calcination of marlstones was conducted at 900 °C for 4 h, and then the modification of calcined marlstones via hydration-dehydration treatment. The effects of different preparation conditions on biodiesel yield were investigated. The solid catalyst was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and the Brunauer-Emmett-Teller (BET) method. The highest biodiesel yield of 97.56% for modified calcium oxide (CaO) catalyst was obtained under the optimum condition (reaction time 5 min, microwave power 600 W, methanol/oil molar ratio 9:1, and catalyst dosage 7 wt%). It was showing potential applications of novel catalyst in biodiesel industry.
Achanai Buasri; Wachirapong Promsupa; Santi Wannato; Sujitra Wanta; Vorrada Loryuenyong. The Application of Modified Marlstones in Biofuel Technology. Materials Science Forum 2018, 926, 101 -106.
AMA StyleAchanai Buasri, Wachirapong Promsupa, Santi Wannato, Sujitra Wanta, Vorrada Loryuenyong. The Application of Modified Marlstones in Biofuel Technology. Materials Science Forum. 2018; 926 ():101-106.
Chicago/Turabian StyleAchanai Buasri; Wachirapong Promsupa; Santi Wannato; Sujitra Wanta; Vorrada Loryuenyong. 2018. "The Application of Modified Marlstones in Biofuel Technology." Materials Science Forum 926, no. : 101-106.
In this research, we focused on silver (Ag) nanoparticles that exhibit various colors on the basis of their localized surface plasmon resonance (LSPR). The effects of step-voltage parameters on the coloration of the Ag deposition-based electrochromic device were investigated. Further, we report the use of reduced graphene oxide (RGO)/biaxially oriented polypropylene (BOPP) as the transparent conductive electrode. RGO was synthesized directly from graphite under a microwave heating system. BOPP film was coated with RGO by drop-casting method. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), energy dispersive spectroscopy (EDS), electrical resistance measurements and cyclic voltammetry (CV). The SEM and TEM images exist as typical wrinkled structure, folded region, transparent, indicating these layers are exfoliated to a very large extent. Our results primarily indicate that the novel BOPP/RGO/Ag/RGO/BOPP configuration presents an easy and expeditious way of preparing the voltage-tunable multicolor electrochromic device. The electrochromic device can be switched from the transparent state to the black state and yellow state.
Achanai Buasri; Suparak Ojchariyakul; Patinya Kaewmanechai; Waratchaya Eakviriyapichat; Vorrada Loryuenyong. The Fabrication of Multicolor Electrochromic Device Based on RGO/BOPP Using Ag Nanoparticles. Materials Science Forum 2018, 926, 79 -84.
AMA StyleAchanai Buasri, Suparak Ojchariyakul, Patinya Kaewmanechai, Waratchaya Eakviriyapichat, Vorrada Loryuenyong. The Fabrication of Multicolor Electrochromic Device Based on RGO/BOPP Using Ag Nanoparticles. Materials Science Forum. 2018; 926 ():79-84.
Chicago/Turabian StyleAchanai Buasri; Suparak Ojchariyakul; Patinya Kaewmanechai; Waratchaya Eakviriyapichat; Vorrada Loryuenyong. 2018. "The Fabrication of Multicolor Electrochromic Device Based on RGO/BOPP Using Ag Nanoparticles." Materials Science Forum 926, no. : 79-84.
The goal of this research was to test barium chloride (BaCl2) impregnated calcined razor clam shell as a solid catalyst for transesterification of rubber seed oil (RSO) in a packed bed reactor (PBR). The waste razor clam shells were crushed, ground, and calcined at 900 °C in a furnace for 2 h to derive calcium oxide (CaO) particles. Subsequently, the calcined shells were impregnated with BaCl2 by wet impregnation method and recalcined at 300 °C for 2 h. The synthesized catalyst was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), Brunauer-Emmett-Teller (BET) surface area, and basic strength measurements. The effects of various parameters such as residence time, reaction temperature, methanol/oil molar ratio, and catalyst bed length on the yield of fatty acid methyl ester (FAME) were determined. The BaCl2/CaO catalyst exhibited much higher catalytic activity and stability than CaO catalyst influenced by the basicity of the doped catalyst. The maximum fatty acid methyl ester yield was 98.7 % under optimum conditions (residence time 2.0 h, reaction temperature 60 °C, methanol/oil molar ratio 12:1, and catalyst bed length 200 mm). After 6 consecutive reactions without any treatment, fatty acid methyl ester yield reduced to 83.1 %. The option of using waste razor clam shell for the production of transesterification catalysts could have economic benefits to the aquaculture and food industries. Copyright © 2018 BCREC Group. All rights reserved.Received: 4th October 2017; Revised: 22nd January 2018; Accepted: 25th January 2018; Available online: 11st June 2018; Published regularly: 1st August 2018How to Cite: Buasri, A., Loryuenyong, V. (2018). Continuous Production of Biodiesel from Rubber Seed Oil Using a Packed Bed Reactor with BaCl2 Impregnated CaO as Catalyst. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (2): 320-330 (doi:10.9767/bcrec.13.2.1585.320-330)
Achanai Buasri; Vorrada Loryuenyong. Continuous Production of Biodiesel from Rubber Seed Oil Using a Packed Bed Reactor with BaCl2 Impregnated CaO as Catalyst. Bulletin of Chemical Reaction Engineering & Catalysis 2018, 13, 320 -330.
AMA StyleAchanai Buasri, Vorrada Loryuenyong. Continuous Production of Biodiesel from Rubber Seed Oil Using a Packed Bed Reactor with BaCl2 Impregnated CaO as Catalyst. Bulletin of Chemical Reaction Engineering & Catalysis. 2018; 13 (2):320-330.
Chicago/Turabian StyleAchanai Buasri; Vorrada Loryuenyong. 2018. "Continuous Production of Biodiesel from Rubber Seed Oil Using a Packed Bed Reactor with BaCl2 Impregnated CaO as Catalyst." Bulletin of Chemical Reaction Engineering & Catalysis 13, no. 2: 320-330.
This research demonstrated the preparation of composite materials between polypyrrole and graphene by cetyltrimethylammonium bromide (CTAB)-assisted polymerization method for use as a counter electrode in dye-sensitized solar cells (DSSCs). The properties of composites were investigated and analyzed by using X-ray diffraction (XRD), raman spectroscopy, fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and cyclic voltammetry (CV). The electrical conductivity and the efficiency of dye-sensitized solar cells with graphene-polypyrrole counter electrode were also studied. The results showed that the addition of graphene in polypyrrole could improve its conductivity due to the formation of bipolaron state. According to CV test, the addition of graphene did not degrade the electrocatalytic performance of polypyrrole. As a consequence, DSSCs based on polypyrrole-graphene counter electrodes exhibited an enhanced energy conversion efficiency, which was comparable to conventional Pt counter electrode.
Vorrada Loryuenyong; Jiravadee Sukitpong; Chutisa Nakpong; Anucha Khadthiphong; Achanai Buasri. Platinum-Free Counter Electrodes Comprised of Polypyrrole-Graphene Composite. Nanoscience and Nanotechnology Letters 2018, 10, 717 -721.
AMA StyleVorrada Loryuenyong, Jiravadee Sukitpong, Chutisa Nakpong, Anucha Khadthiphong, Achanai Buasri. Platinum-Free Counter Electrodes Comprised of Polypyrrole-Graphene Composite. Nanoscience and Nanotechnology Letters. 2018; 10 (5):717-721.
Chicago/Turabian StyleVorrada Loryuenyong; Jiravadee Sukitpong; Chutisa Nakpong; Anucha Khadthiphong; Achanai Buasri. 2018. "Platinum-Free Counter Electrodes Comprised of Polypyrrole-Graphene Composite." Nanoscience and Nanotechnology Letters 10, no. 5: 717-721.
In this work, the effects of halides on the properties of mixed-halide perovskite films are investigated. The films were prepared by sequential deposition two-step technique. PbI2 or PbI2-PbCl2 solution was first spin-coated on fluorine-doped tin oxide glasses, and CH3NH3 (Ix Bry) solution, with different molar ratio of I− and Br− (1:0, 2:1, 4:1, 1:4, 1:2, and 0:1), was subsequently coated on top. Then, the films were annealed at 90°C for 1 h and 100°C for 25 min to transform into perovskite structure. The characterisation of perovskite films included X-ray diffraction, ultraviolet–visible spectroscopy, photoluminescence spectroscopy, and scanning electron microscopy. The results indicated that the incorporation of Br− and/or Cl− in iodine-based perovskites, i.e. CH3NH3 Pb(I1−x Brx)3 and CH3NH3 Pb(I1−x −y Brx Cly)3, would enlarge their bandgap. However, with the use of PbI2 precursor, excess PbI2 occurred and resulted in minor affects on the structural and optical properties. The use of PbCl2 as chlorine source was also found to affect the quality of the film morphology. The analysis in this study could provide another insightful aspect for understanding the role of halides in the synthesis of mixed-halide perovskites.
Vorrada Loryuenyong; Nuchnapa Khiaokaeo; Worrapol Koomsin; Siripat Thongchu; Achanai Buasri. Crystallisation of CH 3 NH 3 PbX 3 (X = I, Br, and Cl) trihalide perovskite using PbI 2 and PbCl 2 precursors. Micro & Nano Letters 2018, 13, 486 -489.
AMA StyleVorrada Loryuenyong, Nuchnapa Khiaokaeo, Worrapol Koomsin, Siripat Thongchu, Achanai Buasri. Crystallisation of CH 3 NH 3 PbX 3 (X = I, Br, and Cl) trihalide perovskite using PbI 2 and PbCl 2 precursors. Micro & Nano Letters. 2018; 13 (4):486-489.
Chicago/Turabian StyleVorrada Loryuenyong; Nuchnapa Khiaokaeo; Worrapol Koomsin; Siripat Thongchu; Achanai Buasri. 2018. "Crystallisation of CH 3 NH 3 PbX 3 (X = I, Br, and Cl) trihalide perovskite using PbI 2 and PbCl 2 precursors." Micro & Nano Letters 13, no. 4: 486-489.
In this study, waste poly(ethylene terephthalate) (PET) bottle was depolymerized using excess ethylene glycol (EG) in the presence of cobalt(II) acetate tetrahydrate ((CH3COO)2Co·4H2O) as a catalyst. It was found that the reacted products consist mainly of bis-2-hydroxy ethylene terephthalate (BHET) monomer. Poly(ethylene terephthalate)-poly(lactic acid) (PET-PLA) copolymers were synthesized by the reaction of BHET with L-lactic acid (LLA) monomers using the catalytic system. The samples were analyzed by nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The 1H and 13C NMR studies confirm the incorporation of lactate units in PET chains after reaction. Further, we report the use of graphene conductive ink and PET-PLA as the electrochromic (EC) device. Copolymer film was coated with graphene ink by spin coating method. Our results primarily indicate that the configuration presents an easy and expeditious way.
Achanai Buasri; Duangamol Ongmali; Pongsatorn Sriboonpeng; Sarinee Prompanut; Vorrada Loryuenyong. Synthesis of PET-PLA copolymer from recycle plastic bottle and study of its applications in the electrochromic devices with graphene conductive ink. Materials Today: Proceedings 2018, 5, 11060 -11067.
AMA StyleAchanai Buasri, Duangamol Ongmali, Pongsatorn Sriboonpeng, Sarinee Prompanut, Vorrada Loryuenyong. Synthesis of PET-PLA copolymer from recycle plastic bottle and study of its applications in the electrochromic devices with graphene conductive ink. Materials Today: Proceedings. 2018; 5 (5):11060-11067.
Chicago/Turabian StyleAchanai Buasri; Duangamol Ongmali; Pongsatorn Sriboonpeng; Sarinee Prompanut; Vorrada Loryuenyong. 2018. "Synthesis of PET-PLA copolymer from recycle plastic bottle and study of its applications in the electrochromic devices with graphene conductive ink." Materials Today: Proceedings 5, no. 5: 11060-11067.
Chuenkamon Rattanapan; Chakrit Jankaenkaew; Thornpong Sirithiwakorn; Vorrada Loryuenyong; Achanai Buasri. Application of bioplastics and thermal reduced graphene oxide in electrochromic devices. Materials Today: Proceedings 2018, 5, 14868 -14873.
AMA StyleChuenkamon Rattanapan, Chakrit Jankaenkaew, Thornpong Sirithiwakorn, Vorrada Loryuenyong, Achanai Buasri. Application of bioplastics and thermal reduced graphene oxide in electrochromic devices. Materials Today: Proceedings. 2018; 5 (7):14868-14873.
Chicago/Turabian StyleChuenkamon Rattanapan; Chakrit Jankaenkaew; Thornpong Sirithiwakorn; Vorrada Loryuenyong; Achanai Buasri. 2018. "Application of bioplastics and thermal reduced graphene oxide in electrochromic devices." Materials Today: Proceedings 5, no. 7: 14868-14873.
Titanium dioxide (TiO2) is one of the most well known photocatalytic materials. However, TiO2 is only photoactive to ultraviolet (UV) light, and the lifetime of the electron-hole pair recombination is too short. In this work, TiO2 anatase nanotubes with an energy band gap of 3.01 eV and specific surface area of 112.46 m2/g were synthesized via hydrothermal method. The results showed that, by incorporating graphene oxide (XGO) and reduced graphene oxide (RGO), the photodegradation efficiency could be enhanced by increasing electron lifetime and charge carrier separation, as well as narrowing the energy band gap. The examination of photodegradation activity under UVC irradiation indicated that a maximum photodegradation efficiency was achieved with TiO2-XGO nanocomposite due to its high specific surface area and strong hydrophilic property.
Vorrada Loryuenyong; Khajornsak Intong; Vannapa Pongpraphan; Watcharothai Suksakkhee; Achanai Buasri. Photocatalytic Application of Graphene-Based TiO2 Nanocomposite. Solid State Phenomena 2017, 266, 79 -83.
AMA StyleVorrada Loryuenyong, Khajornsak Intong, Vannapa Pongpraphan, Watcharothai Suksakkhee, Achanai Buasri. Photocatalytic Application of Graphene-Based TiO2 Nanocomposite. Solid State Phenomena. 2017; 266 ():79-83.
Chicago/Turabian StyleVorrada Loryuenyong; Khajornsak Intong; Vannapa Pongpraphan; Watcharothai Suksakkhee; Achanai Buasri. 2017. "Photocatalytic Application of Graphene-Based TiO2 Nanocomposite." Solid State Phenomena 266, no. : 79-83.
In this study, the effects of graphene content (0, 0.1, 0.3, 0.5, and 1.0 wt.% of cement) on the mechanical and physical properties of cement composites in the form of mortars were investigated. Graphene was simply and successfully synthesized using a kitchen blender and household detergent. All cement mixtures had a water : cement : sand ratio of 0.4:1:1.5 by weight and 1.25 wt.% polycarboxylate water reducer. The specimens were cured in water for 14 days before testing. The results indicated that the addition of graphene greatly shortened the setting time of cement paste. It was also found that the compressive strength of cement mortars was maximized with 0.1 wt.% graphene reinforcement. This reinforcing effect was attributed to two mechanisms: (1) the uniform dispersion of reinforcing graphene and (2) the acceleration of hydration process and the enhanced degree of hydration, which led to pore refinement and densification of the cement mortars.
Vorrada Loryuenyong; Kanistha Pluemmalung; Pattarawadee Rattanapanya; Arayakamol Waeokhum; Achanai Buasri. The Reinforcement of Graphene Produced by Kitchen Blender in Cement Mortar. Key Engineering Materials 2017, 744, 77 -82.
AMA StyleVorrada Loryuenyong, Kanistha Pluemmalung, Pattarawadee Rattanapanya, Arayakamol Waeokhum, Achanai Buasri. The Reinforcement of Graphene Produced by Kitchen Blender in Cement Mortar. Key Engineering Materials. 2017; 744 ():77-82.
Chicago/Turabian StyleVorrada Loryuenyong; Kanistha Pluemmalung; Pattarawadee Rattanapanya; Arayakamol Waeokhum; Achanai Buasri. 2017. "The Reinforcement of Graphene Produced by Kitchen Blender in Cement Mortar." Key Engineering Materials 744, no. : 77-82.
Nowadays, utilization of biomass is considered to have the potential to solve many environmental problems and provide a source of renewable and environmentally-friendly energy. Research on green and low cost catalysts is needed for economical production of biodiesel. The goal of this work was to test potassium iodide (KI)-impregnated calcined razor clam shell as a heterogeneous catalyst for transesterification of Jatropha curcas oil in a microwave reactor. The effects of different preparation conditions on biodiesel yield were investigated and the structure of the catalyst was characterized. The raw material and the resulting solid catalyst were characterized using X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM) and the Brunauer-Emmett-Teller (BET) method. The waste shell displays a typical layered architecture. The sample had the surface area 16.51 m2/g, pore diameter 22.18 nm and pore volume 0.14 cm3/g, and presented a uniform pore size. The highest fatty acid methyl ester (FAME) yield of 96.99% for potassium iodide-calcium oxide (KI-CaO) catalyst was obtained under the optimum condition (reaction time 5 min, microwave power 600 W, methanol/oil molar ratio 12:1, and catalyst dosage 3 wt%). It was showing potential applications of catalyst in biodiesel industry.
Achanai Buasri; Pittayarat Chaibundit; Metawee Kuboonprasert; Arnan Silajan; Vorrada Loryuenyong. Preparation of KI-Impregnated Razor Clam Shell as a Catalyst and its Application in Biodiesel Production from Jatropha curcas Oil. Key Engineering Materials 2017, 744, 506 -510.
AMA StyleAchanai Buasri, Pittayarat Chaibundit, Metawee Kuboonprasert, Arnan Silajan, Vorrada Loryuenyong. Preparation of KI-Impregnated Razor Clam Shell as a Catalyst and its Application in Biodiesel Production from Jatropha curcas Oil. Key Engineering Materials. 2017; 744 ():506-510.
Chicago/Turabian StyleAchanai Buasri; Pittayarat Chaibundit; Metawee Kuboonprasert; Arnan Silajan; Vorrada Loryuenyong. 2017. "Preparation of KI-Impregnated Razor Clam Shell as a Catalyst and its Application in Biodiesel Production from Jatropha curcas Oil." Key Engineering Materials 744, no. : 506-510.
Electrochromism refers to the reversible change of color of thin films due to a small change in the voltage. This is important for smart windows and display applications. The color change takes place because of intercalation and deintercalation of ions, which is controlled by voltage applied between transparent conductive oxide (TCO) layers. In this research, the use of graphene nano-ink and post-consumer poly(ethylene terephthalate) (PET) bottles as the flexible electrochromic windows was reported. PET film was coated with graphene ink by spin coating method. The sheet resistance value of PET/graphene electrode was 19 W/sq. The polypyrrole (PPy) also was electroactive and had good adhesion towards transparent substrate. Our results primarily indicated that the novel PET/graphene/PPy/graphene/PET electrochromic device offered an optical modulation, in which the color of the device switched from the black color to the yellow color under the applied potential at ± 2.0 V. The graphene in the electrochromic device demonstrated a potential for replacing indium tin oxide (ITO) in flexible electrochromic windows.
Achanai Buasri; Duangamol Ongmali; Pongsatorn Sriboonpeng; Sarinee Prompanut; Vorrada Loryuenyong. Development of Transparent Electrodes Using Graphene Nano-Ink and Post-Consumer PET Bottles for Electrochromic Application. Key Engineering Materials 2017, 744, 463 -467.
AMA StyleAchanai Buasri, Duangamol Ongmali, Pongsatorn Sriboonpeng, Sarinee Prompanut, Vorrada Loryuenyong. Development of Transparent Electrodes Using Graphene Nano-Ink and Post-Consumer PET Bottles for Electrochromic Application. Key Engineering Materials. 2017; 744 ():463-467.
Chicago/Turabian StyleAchanai Buasri; Duangamol Ongmali; Pongsatorn Sriboonpeng; Sarinee Prompanut; Vorrada Loryuenyong. 2017. "Development of Transparent Electrodes Using Graphene Nano-Ink and Post-Consumer PET Bottles for Electrochromic Application." Key Engineering Materials 744, no. : 463-467.
Achanai Buasri; Vorrada Loryuenyong. Application of waste materials as a heterogeneous catalyst for biodiesel production from Jatropha Curcas oil via microwave irradiation. Materials Today: Proceedings 2017, 4, 6051 -6059.
AMA StyleAchanai Buasri, Vorrada Loryuenyong. Application of waste materials as a heterogeneous catalyst for biodiesel production from Jatropha Curcas oil via microwave irradiation. Materials Today: Proceedings. 2017; 4 (5):6051-6059.
Chicago/Turabian StyleAchanai Buasri; Vorrada Loryuenyong. 2017. "Application of waste materials as a heterogeneous catalyst for biodiesel production from Jatropha Curcas oil via microwave irradiation." Materials Today: Proceedings 4, no. 5: 6051-6059.
We used a microwave heating system to increase Jatropha biodiesel yield, and to reduce both reaction time and energy consumption. The feasibility of converting natural and non-edible feedstocks including arcuate mussel shells and dolomitic rocks, into a novel high-performance, reusable, low-cost and heterogeneous catalyst for the synthesis of biodiesel was also explored. Arcuate mussel shells and dolomitic rocks were first ground and calcined at 900 °C for 2 h. After calcination, calcium oxide (CaO) or a mixed oxide of calcium and magnesium (CaO·MgO) was obtained as white powder, which was then chemically activated to improve the physical, chemical and surface properties, and catalytic activities of the catalysts. By heating CaO from waste shells in an excess dehydrated methanol under 65 °C at 8 h with nitrogen (N2) flow, calcium methoxide (Ca(OCH3)2) catalyst was prepared. The CaO from natural rocks was, however, turned into calcium glyceroxide complex, by combining with methanol and glycerol of the by-product. It was determined that calcium glyceroxide (Ca[O(OH)2C3H5]2) was formed during the transesterification and acted as the most active phase. Catalyst characterization was by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR), and Brunauer-Emmett-Teller (BET) surface area and basic strength measurements. The reaction parameters, including reaction time, microwave power, methanol/oil molar ratio, catalyst dosage and catalyst reusability, were studied for fatty acid methyl esters (FAME) yield. The results indicated that Ca(OCH3)2 and Ca[O(OH)2C3H5]2 catalysts derived from waste shells and natural rocks showed good reusability, high energy efficient, environmental-friendly, low cost and facile route for the synthesis of biodiesel.
Achanai Buasri; Methasit Lukkanasiri; Raviporn Nernrimnong; Surachai Tonseeya; Kanokphol Rochanakit; Wasupon Wongvitvichot; Uraiporn Masa-Ard; Vorrada Loryuenyong. Rapid transesterification of Jatropha curcas oil to biodiesel using novel catalyst with a microwave heating system. Korean Journal of Chemical Engineering 2016, 33, 3388 -3400.
AMA StyleAchanai Buasri, Methasit Lukkanasiri, Raviporn Nernrimnong, Surachai Tonseeya, Kanokphol Rochanakit, Wasupon Wongvitvichot, Uraiporn Masa-Ard, Vorrada Loryuenyong. Rapid transesterification of Jatropha curcas oil to biodiesel using novel catalyst with a microwave heating system. Korean Journal of Chemical Engineering. 2016; 33 (12):3388-3400.
Chicago/Turabian StyleAchanai Buasri; Methasit Lukkanasiri; Raviporn Nernrimnong; Surachai Tonseeya; Kanokphol Rochanakit; Wasupon Wongvitvichot; Uraiporn Masa-Ard; Vorrada Loryuenyong. 2016. "Rapid transesterification of Jatropha curcas oil to biodiesel using novel catalyst with a microwave heating system." Korean Journal of Chemical Engineering 33, no. 12: 3388-3400.
This research aims to study the physical, mechanical and thermal properties of poly (butylene succinate)/graphene oxide (PBS/XGO) nanocomposites. The polymer nanocomposites were successfully prepared by solution processing in conjunction with compression molding at various contents of XGO from 0-1.0 wt%. The structure, tensile properties and thermal stability of materials have been investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), mechanical test, and thermogravimetric analysis. The results revealed that PBS and XGO could mix with each other homogeneously, and uniform dispersion of XGO in the PBS matrix occurred when the filler content was less than 1.0 wt%. Young′s modulus and degradation temperature (Td) of biopolymer were greatly improved by the addition of a small amount of XGO (1.0 wt%). The nanocomposites have potential application as packing materials.
Achanai Buasri; Udon Kampichit; Panupong Salacharoen; Pouvadon Sangsawee; Vorrada Loryuenyong. The Improvement in Mechanical and Thermal Properties of Biodegradable Poly(Butylene Succinate) (PBS) Nanocomposites with Low Loadings of Graphene Oxide (XGO). Materials Science Forum 2016, 872, 235 -241.
AMA StyleAchanai Buasri, Udon Kampichit, Panupong Salacharoen, Pouvadon Sangsawee, Vorrada Loryuenyong. The Improvement in Mechanical and Thermal Properties of Biodegradable Poly(Butylene Succinate) (PBS) Nanocomposites with Low Loadings of Graphene Oxide (XGO). Materials Science Forum. 2016; 872 ():235-241.
Chicago/Turabian StyleAchanai Buasri; Udon Kampichit; Panupong Salacharoen; Pouvadon Sangsawee; Vorrada Loryuenyong. 2016. "The Improvement in Mechanical and Thermal Properties of Biodegradable Poly(Butylene Succinate) (PBS) Nanocomposites with Low Loadings of Graphene Oxide (XGO)." Materials Science Forum 872, no. : 235-241.
This research studied the preparation of polyaniline/graphene hybrid material as a counter electrode in dye-sensitised solar cells by drop casting onto fluorine-doped tin oxide glass slides. Scanning electron microscope measurement revealed the rough surface of the hybrid films. The results have also shown that 1:2 ratio of PANI/graphene hybrid counter electrode provided a synergy that offered a comparable conversion efficiency to that of conventional Pt electrode.
Vorrada Loryuenyong; Sajjarinee Yaotrakool; Pratya Prathumted; Julaluck Lertsiri; Achanai Buasri. Synergistic effects of graphene–polyaniline counter electrode in dye‐sensitised solar cells. Micro & Nano Letters 2016, 11, 77 -80.
AMA StyleVorrada Loryuenyong, Sajjarinee Yaotrakool, Pratya Prathumted, Julaluck Lertsiri, Achanai Buasri. Synergistic effects of graphene–polyaniline counter electrode in dye‐sensitised solar cells. Micro & Nano Letters. 2016; 11 (2):77-80.
Chicago/Turabian StyleVorrada Loryuenyong; Sajjarinee Yaotrakool; Pratya Prathumted; Julaluck Lertsiri; Achanai Buasri. 2016. "Synergistic effects of graphene–polyaniline counter electrode in dye‐sensitised solar cells." Micro & Nano Letters 11, no. 2: 77-80.
Reduced graphene oxide (RGO)/TiO₂ nanocomposite was successfully prepared by UV-assisted photocatalytic reduction of graphene oxide (XGO) by TiO₂ nanoparticles in ethanol. The effects of XGO and RGO addition in TiO₂were characterized by transmission electron microscopy (TEM), X-ray diffractometer (XRD), diffuse reflectance UV-vis spectrophotometer (UV-vis), fourier-transform infrared spectroscopy (FTIR), photoluminescence (PL), and Brunauer-Emmett-Teller (BET) and Barrett-Joiner-Halenda (BJH) porosity analysis. The photocatalytic activity of prepared nanocomposites was evaluated from the kinetics of the photocatalytic degradation of cationic methylene blue dye under UV irradiation. Bandgap, the electron-hole recombination, specific surface area, surface functional groups, and adsorption capacity of nanocomposites were found to play a significant role in the degradation. The results revealed that RGO/TiO₂ and XGO/TiO₂ nanocomposites exhibited efficient charge separation and enhanced photocatalytic activity, compared to pristine TiO₂. Nearly 500% improvement was observed in this work.
Vorrada Loryuenyong; Jaruwan Charoensuk; Rachaya Charupongtawitch; Amika Usakulwattana; Achanai Buasri; Loryuenyong Vorrada; Charoensuk Jaruwan; Charupongtawitch Rachaya; Usakulwattana Amika; Buasri Achanai. Kinetics of Photocatalytic Degradation of Methylene Blue by TiO2-Graphene Nanocomposites. Journal of Nanoscience and Nanotechnology 2016, 16, 296 -302.
AMA StyleVorrada Loryuenyong, Jaruwan Charoensuk, Rachaya Charupongtawitch, Amika Usakulwattana, Achanai Buasri, Loryuenyong Vorrada, Charoensuk Jaruwan, Charupongtawitch Rachaya, Usakulwattana Amika, Buasri Achanai. Kinetics of Photocatalytic Degradation of Methylene Blue by TiO2-Graphene Nanocomposites. Journal of Nanoscience and Nanotechnology. 2016; 16 (1):296-302.
Chicago/Turabian StyleVorrada Loryuenyong; Jaruwan Charoensuk; Rachaya Charupongtawitch; Amika Usakulwattana; Achanai Buasri; Loryuenyong Vorrada; Charoensuk Jaruwan; Charupongtawitch Rachaya; Usakulwattana Amika; Buasri Achanai. 2016. "Kinetics of Photocatalytic Degradation of Methylene Blue by TiO2-Graphene Nanocomposites." Journal of Nanoscience and Nanotechnology 16, no. 1: 296-302.