The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Guilin Zhou - One of the best experts on this subject based on the ideXlab platform.
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Activated Carbon Adsorbents with micro-mesoporous structure derived from waste biomass by stepwise activation for toluene removal from air
Journal of Environmental Chemical Engineering, 1Co-Authors: Guizhi Zhang, Bingman Lei, Shengming Chen, Hongmei Xie, Guilin ZhouAbstract:Abstract The waste biomass was used as raw materials to prepare Activated Carbon Adsorbents with micro-mesoporous structure. And the prepared Activated Carbon Adsorbents were used to adsorption remove toluene from air, which can achieve the goal of “treat waste with waste”. In this paper, biomass Activated Carbon Adsorbents with micro‒mesoporous structure were prepared by two-stage process of “low temperature Carbonization‒high temperature activation” using waste biomass as raw materials and H3PO4 as activator. The obtained results show that the activation temperature can significantly affect the structural characteristics, graphitization degree and surface chemical properties of the prepared Adsorbents, and the toluene adsorption and regeneration performances of the Adsorbent are significantly affected by its physicochemical properties. High thermal desorption temperature (100 °C) can destroy the strong interaction between the oxygen atoms of the oxygen-containing functional groups on the surface of the Adsorbent and the p-electrons of toluene aromatic ring, thus realizing the desorption of corresponding adsorbed toluene molecules. The low heat treatment temperature of 60 °C can destroy the strong adsorption from narrow micropores for toluene and π‒π conjugation effect between the Adsorbent and toluene molecules, which can realize the corresponding adsorbed toluene molecules to be desorbed. When the activation temperature is 650 °C, the Activated Carbon Adsorbent with surface area of 1006.2 m2/g, micro-mesoporous structure and mesoporous proportion of 65.5% can be prepared. The adsorption capacity of toluene can reach 417.0 mg/g, and the toluene thermal desorption regeneration can be realized at 60 °C. The results indicate that it is a promising Adsorbent material for toluene removal from air
Guizhi Zhang - One of the best experts on this subject based on the ideXlab platform.
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Activated Carbon Adsorbents with micro-mesoporous structure derived from waste biomass by stepwise activation for toluene removal from air
Journal of Environmental Chemical Engineering, 1Co-Authors: Guizhi Zhang, Bingman Lei, Shengming Chen, Hongmei Xie, Guilin ZhouAbstract:Abstract The waste biomass was used as raw materials to prepare Activated Carbon Adsorbents with micro-mesoporous structure. And the prepared Activated Carbon Adsorbents were used to adsorption remove toluene from air, which can achieve the goal of “treat waste with waste”. In this paper, biomass Activated Carbon Adsorbents with micro‒mesoporous structure were prepared by two-stage process of “low temperature Carbonization‒high temperature activation” using waste biomass as raw materials and H3PO4 as activator. The obtained results show that the activation temperature can significantly affect the structural characteristics, graphitization degree and surface chemical properties of the prepared Adsorbents, and the toluene adsorption and regeneration performances of the Adsorbent are significantly affected by its physicochemical properties. High thermal desorption temperature (100 °C) can destroy the strong interaction between the oxygen atoms of the oxygen-containing functional groups on the surface of the Adsorbent and the p-electrons of toluene aromatic ring, thus realizing the desorption of corresponding adsorbed toluene molecules. The low heat treatment temperature of 60 °C can destroy the strong adsorption from narrow micropores for toluene and π‒π conjugation effect between the Adsorbent and toluene molecules, which can realize the corresponding adsorbed toluene molecules to be desorbed. When the activation temperature is 650 °C, the Activated Carbon Adsorbent with surface area of 1006.2 m2/g, micro-mesoporous structure and mesoporous proportion of 65.5% can be prepared. The adsorption capacity of toluene can reach 417.0 mg/g, and the toluene thermal desorption regeneration can be realized at 60 °C. The results indicate that it is a promising Adsorbent material for toluene removal from air
Hosein Shojaee- Farah Abady Leila Nematpour - One of the best experts on this subject based on the ideXlab platform.
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Removal of styrene by the synthesized ZnO nanoparticles coated on the Activated Carbon Adsorbent in the presence of UV irradiation
2019Co-Authors: Mojtaba Nakhaei Pour Hossein Ali Rangkooy, Fereshteh Jahani, Ameneh Golbaghi, Hosein Shojaee- Farah Abady Leila NematpourAbstract:Background: Volatile organic compounds are the major environmental pollutants causing adverse effects on the human health and the environment, therefore, tremendous effort has been put toward eliminating these compounds. Methods: In this study, the effect of synthesized nanoparticles on the removal of styrene from gas phase by photocatalytic process under UV irradiation in the cylindrical photoreactor was studied. The Activated Carbon-zinc oxide (AC-ZnO) catalysts were prepared at different weight ratios (6%, 12%, and 18%) of ZnO. The prepared catalyst was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and Brunauer-Emmett-Teller (BET) analyses. The effects of various parameters, such as concentrations of styrene, various weight percentage (wt%) of nanoparticles, and UV irradiation, were investigated. The efficiency of the AC-ZnO catalyst was determined based on its adsorption capacity, breakthrough time, and removal efficiency. Results: It was revealed that the photocatalytic removal efficiency of styrene was high in the presence of both ZnO nanoparticle and AC under UV light. Under optimal conditions, the efficiency of UV/ACZnO 18%, UV/AC-ZnO 12%, and UV/AC-ZnO 6% catalysts was 77%, 86%, and 83%, respectively. By increasing the concentration of input styrene, the photocatalytic removal efficiency was reduced, while the adsorption capacity of styrene increased. Conclusion: According to the results, the AC-ZnO 12% exhibited higher activity compared to other photocatalysts. Also, the amount of stabilized ZnO nanoparticles on the Activated Carbon affects the elimination rate of styrene. Keywords: Photocatalysis, Activated Carbon, Styrene, Zinc oxid
Leila Nematpour - One of the best experts on this subject based on the ideXlab platform.
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Removal of styrene by the synthesized ZnO nanoparticles coated on the Activated Carbon Adsorbent in the presence of UV irradiation
Environmental Health Engineering and Management, 2019Co-Authors: Mojtaba Nakhaei Pour, Hossein Ali Rangkooy, Fereshteh Jahani, Ameneh Golbaghi, Hosein Shojaee Farah Abady, Leila NematpourAbstract:Background: Volatile organic compounds are the major environmental pollutants causing adverse effects on the human health and the environment, therefore, tremendous effort has been put toward eliminating these compounds. Methods: In this study, the effect of synthesized nanoparticles on the removal of styrene from gas phase by photocatalytic process under UV irradiation in the cylindrical photoreactor was studied. The Activated Carbon-zinc oxide (AC-ZnO) catalysts were prepared at different weight ratios (6%, 12%, and 18%) of ZnO. The prepared catalyst was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and Brunauer-Emmett-Teller (BET) analyses. The effects of various parameters, such as concentrations of styrene, various weight percentage (wt%) of nanoparticles, and UV irradiation, were investigated. The efficiency of the AC-ZnO catalyst was determined based on its adsorption capacity, breakthrough time, and removal efficiency. Results: It was revealed that the photocatalytic removal efficiency of styrene was high in the presence of both ZnO nanoparticle and AC under UV light. Under optimal conditions, the efficiency of UV/ACZnO 18%, UV/AC-ZnO 12%, and UV/AC-ZnO 6% catalysts was 77%, 86%, and 83%, respectively. By increasing the concentration of input styrene, the photocatalytic removal efficiency was reduced, while the adsorption capacity of styrene increased. Conclusion: According to the results, the AC-ZnO 12% exhibited higher activity compared to other photocatalysts. Also, the amount of stabilized ZnO nanoparticles on the Activated Carbon affects the elimination rate of styrene.
Robert E. Critoph - One of the best experts on this subject based on the ideXlab platform.
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Study of thermal conductivity, permeability, and adsorption performance of consolidated composite Activated Carbon Adsorbent for refrigeration
Renewable Energy, 2011Co-Authors: Liwei Wang, Robert E. Critoph, Zacharie Tamainot-telto, Roger Thorpe, Steven J. Metcalf, Ruzhu WangAbstract:Abstract Composite Adsorbents, comprising Activated Carbon and expanded natural graphite, have been developed, and their thermal conductivity, permeability and adsorption performance were tested. The thermal conductivity varied with the ratio of Activated Carbon to expanded natural graphite. Thermal conductivity increased as the ratio of expanded graphite increased. Considering that the density of Activated Carbon for the composite Adsorbent should not be lower than 200 kg/m3, otherwise the volumetric cooling capacity would be unacceptably low, the highest thermal conductivity obtained from experiments was 2.47 W m−1 K−1. The permeability was also measured, and the best result obtained was 4.378 × 10−12 m2. In order to evaluate the influence of heat and mass transfer on adsorption performance, the adsorption rate was tested using a Rubotherm magnetic suspension balance, and results showed that for the freezing conditions lower than −10 °C the performance of granular Activated Carbon was better than that of solidified Adsorbent because of the reduced mass transfer of ammonia at low saturated pressure. The adsorption performance of consolidated Adsorbents increased rapidly when the evaporating temperature was higher than −10 °C. When the evaporating temperature was 8 °C, the adsorption rate of consolidated Adsorbent was improved by 29% if compared with that of granular Adsorbent.
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Solar sorption refrigerator
Renewable Energy, 1997Co-Authors: Robert E. Critoph, Zacharie Tamainot-telto, E. MunyebvuAbstract:Abstract The performance of a solar sorption refrigerator is studied experimentally for three configurations of its collector cover: with single glazing, with double glazing and with single glazing plus transparent insulation. The collector consists of fifteen stainless steel tubes having a selective surface (with good thermal absorption coefficient) and contains granular Activated Carbon Adsorbent with ammonia refrigerant. The collector surface area is approximately 1.43 m2 and contains about 17 kg of Carbon. The collector operates with good efficiency (36 to 47% depending on conditions) when in the single glazing configuration.