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| 1 | Efficient degradation of chlorobenzene in a non-thermal plasma catalytic reactor supported on CeO_2/HZSM-5 catalysts显示文摘Chlorobenzene removal was investigated in a non-thermal plasma reactor using CeO_2/HZSM-5catalysts.The performance of catalysts was evaluated in terms of removal and energy efficiency.The decomposition products of chlorobenzene were analyzed.The results show that CeO_2/HZSM-5 exhibited a good catalytic activity,which resulted in enhancements of chlorobenzene removal,energy efficiency,and the formation of lower amounts of by-products.With regards to CO_2 selectivity,the presence of catalysts favors the oxidation of by-products,leading to a higher CO_2 selectivity.With respect to ozone,which is considered as an unavoidable by-product in air plasma reactors,a noticeable decrease in its concentration was observed in the presence of catalysts.Furthermore,the stability of the catalyst was investigated by analyzing the evolution of conversion in time.The experiment results indicated that CeO_2/HZSM-5 catalysts have excellent stability:chlorobenzene conversion only decreased from 78%to 60%after 75 hr,which means that the CeO_2/HZSM-5 suffered a slight deactivation.Some organic compounds and chlorinated intermediates were adsorbed or deposited on the catalysts surface as shown by the results of Fourier Transform Infrared(FT-IR) spectroscopy,scanning electron microscope(SEM) and energy dispersive X-ray spectroscopy(EDS) analyses of the catalyst before and after the reaction,revealing the cause of catalyst deactivation. | Liying Jiang Guofeng Nie Runye Zhu Jiade Wang Jianmeng Chen Yubo Mao Zhuowei Cheng Willam A.Anderson | 2017 | Journal of Environmental Sciences2017，29，5： | 8 |
| 2 | Removal characteristics and kinetic analysis of an aerobic vapor-phase bioreactor for hydrophobic alpha-pinene显示文摘Biofiltration is considered an effective method to control volatile organic compounds(VOCs) pollution.This study was conducted to evaluate the potential use of a bacterial biofilter packed with wood chips and peat for the removal of hydrophobic α-pinene.When inoculated with two pure degraders and adapted activated sludge,a removal efficiency(RE) of more than 95% was achieved after a startup period of 11 days.The maximum elimination capacity(EC) of 50 g/(m 3 ·hr) with RE of 94% was obtained at empty bed retention time(EBRT) of 102 sec.When higher α-pinene concentrations and shorter EBRTs were applied,the REs and ECs decreased significantly due to mass-transfer and biological reaction limitations.As deduced from the experimental results,approximately 74% of α-pinene were completely mineralized by the consortiums and the biomass yield was 0.60 g biomass/g α-pinene.Sequence analysis of the selected bands excised from denaturing gradient gel electrophoresis revealed that the inoculated pure cultures could be present during the whole operation,and others were closely related to bacteria being able to degrade hydrocarbons.The kinetic results demonstrated that the whole biofiltration for α-pinene was diffusion-limit controlled owing to its hydrophobic characteristics.These findings indicated that this bacterial biofiltration is a promising technology for the remediation of hydrophobic industrial waste gases containing α-pinene. | Yifeng Jiang Shanshan Li Zhuowei Cheng Runye Zhu Jianmeng Chen | 2012 | Journal of Environmental Sciences2012，24，8： | 2 |
| 3 | Mechanism and kinetics of 2-chlorophenol decomposition using coupled ultrasound and electrocatalysis显示文摘A coupled ultrasound/electrocatalysis(US/EC) process was used to enhance the decomposition effi-ciency of organics.The synergetic kinetics and the mechanism of 2-chlorophenol(2-CP) decomposi-tion with coupled US/EC were studied.It was found that in a US/EC process 2-CP is attacked by active radicals(such as hydroxyl radicals) to form 2-chloro-p-benzoquinone,and the latter is oxidized to simple organic acids when the ring is opened.The enhancement factor expressed by the apparent rate constant of 2-CP decomposition with coupled US/EC is 1.324 at a current density of 20 mA·cm-2,an ultrasonic frequency of 20 kHz,an ultrasonic intensity of 0.27 W·cm-2,and a 2-CP initial concentration of 200 mg·L-1,which means that a synergetic effect exists.A model derived from Langmuir adsorption theory of solid surface and reaction kinetics equations can describe exactly the decomposition of 2-CP with coupled US/EC.The numerical values are in good agreement with the experimental data.The model parameters are associated with reaction conditions. | WANG JiaDe ZHU RunYe CHEN Xia CHEN JianMeng | 2008 | Science China Chemistry2008，51，6： | 2 |
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