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吸附模式对有机物光催化降解的影响3.MEA-Langmuir-Hinshelwood光催化降解动力学方程 被引量:7
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作者 潘纲 刘媛媛 《环境化学》 CAS CSCD 北大核心 2006年第1期11-15,共5页
传统的LangmuirHinshelwood方程式不能定性、定量地解释H酸在TiO2表面的吸附平衡常数KL与其在TiO2悬浮液中的光催化降解速率r之间的关系.这是因为在实际测定中,吸附平衡常数KL一般是通过给定有机物的平衡吸附量和平衡浓度而求得的.这样... 传统的LangmuirHinshelwood方程式不能定性、定量地解释H酸在TiO2表面的吸附平衡常数KL与其在TiO2悬浮液中的光催化降解速率r之间的关系.这是因为在实际测定中,吸附平衡常数KL一般是通过给定有机物的平衡吸附量和平衡浓度而求得的.这样的KL不能表达给定有机物不同吸附模式吸附力的差别.因而以往的理论方法不能描述吸附力对光催化降解动力学的影响,而只能描述吸附量对r的影响.亚稳平衡态吸附(MEA)理论认为,同一吸附质在相同的热力学条件下可以不同的MEA态(包括同一溶质的不同吸附构型/模式)达到实际的吸附终态.从MEA的概念对LangmuirHinshelwood模型进行半经验性修正,可以较好地描述吸附量和吸附力(吸附模式)共同对H酸在TiO2悬浮液中光催化降解动力学的影响. 展开更多
关键词 H-酸 TIO2 Langmuir—Hinshelwood模型 吸附 光催化降解动力学.
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Kinetics of Photocatalytic Degradation of Gaseous Organic Compounds on Modified TiO_2/AC Composite Photocatalyst 被引量:4
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作者 杨青山 廖永进 毛玲玲 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第3期572-576,共5页
This study is focused on the kinetic characteristics of photocatalytic degradation of gaseous organic compounds on modified titanium dioxide/activated carbon composite photocatalyst(MTA).The MTA,which co-doping with i... This study is focused on the kinetic characteristics of photocatalytic degradation of gaseous organic compounds on modified titanium dioxide/activated carbon composite photocatalyst(MTA).The MTA,which co-doping with iron(Fe) and nitrogen(N),was synthesized by a sol-gel method,and its photocatalytic performance was investigated under different reaction conditions.The experimental data obtained were tested by the zero,first and second order kinetic model,and the factors affecting the kinetic model were analyzed.It was clearly demonstrated that the experimental data of toluene and acetone on MTA fit quite well with second order kinetic model equation,but the experimental data of formaldehyde fits well with zero order kinetic model equation. 展开更多
关键词 titanium dioxide activated carbon PHOTOCATALYST kinetic model
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Kinetic Modeling of the Photocatalytic Degradation of Methyl Orange by Supported TiO2 被引量:2
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作者 N. Barka S. Qourzal A. Assabbane Y. Ait-Ichou 《Journal of Environmental Science and Engineering》 2010年第5期1-5,共5页
The photocatalytic degradation of methyl orange (MO) in UV/Supported-TiO2 system was investigated and a kinetic model was presented. The experimental results show that the photocatalytic degradation rate is favored ... The photocatalytic degradation of methyl orange (MO) in UV/Supported-TiO2 system was investigated and a kinetic model was presented. The experimental results show that the photocatalytic degradation rate is favored by high concentration of dye in solution and is enhanced by the solution temperature. A simple kinetic model has been proposed which can describe the discoloration process in an adequate way. The calculated results obtained were in good agreement with experimental data. The model predicts the concentration of MO during the photocatalytic degradation process. 展开更多
关键词 Kinetics modeling PHOTOCATALYSIS methyl orange supported TiO2.
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Studies of Photocatalytic Kinetics on the Degradation of Bisphenol A (BPA) by Immobilized ZnO Nanoparticles in Aerated Photoreactors
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作者 Yong Tao Zuolian Cheng +1 位作者 Kok Eng Ting Xi Jiang Yin 《Journal of Environmental Science and Engineering(A)》 2012年第2期187-194,共8页
The photocatalytic kinetics of BPA (4, 4'-isopropylidenediphenol), a representative endocrine disruptor, was explored using immobilized ZnO nanoparticles as a photocatalyst in a laboratory scale photocatalytic reac... The photocatalytic kinetics of BPA (4, 4'-isopropylidenediphenol), a representative endocrine disruptor, was explored using immobilized ZnO nanoparticles as a photocatalyst in a laboratory scale photocatalytic reactor. The conditions of photocatalytic degradation were optimized. Direct photocatalytic degradation of BPA was undertaken in an aqueous solution containing ZnO nanoparticles under the optimized experimental conditions. The effects of various factors, such as initial BPA concentrations, initial pH values and various anions (CI, NO3, COa2, SO42-, HCO3") were investigated. In the case of the nanoparticles derived films, the photocatalytic efficiency was found not to be remarkably related with the calcination temperature employed in the coating process. Screen-printed ZnO nanoparticles films obtained in the optimal processing conditions showed that the photocatalytic activity is comparable to ZnO nanoparticles in aqueous suspensions. Over 90% degradation efficiency of BPA was achieved under the optimum conditions. The degradation rates in all photocatalytic experiments were linear with the degradation efficiencies of BPA by regression analysis (r ≥ 0.99). The results showed that the degradation kinetics of BPA in the reactor with immobilized nano-ZnO film as photocatalyst was in agreement with a pseudo-first order rate law. 展开更多
关键词 Bisphenol A (BPA) immobilized ZnO film high performance liquid chromatography (HPLC) photocatalyticdegradation photocatalytic kinetics.
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