Catalytic technologies have been paid increasing attention in refractory pollutants abatement due to its practical and potential values in water purification. As effective and efficient approaches for water purificati...Catalytic technologies have been paid increasing attention in refractory pollutants abatement due to its practical and potential values in water purification. As effective and efficient approaches for water purification, Fenton＇s reagent, ozonation, electrochemical and photocatalytic methods have been widely studied and applied in different aspects and have been reviewed by several articles. In recent years, some novel catalytic processes based on above processes have been developed for enhancing the efficiency of removing the organics from water. This review emphasized on the recent development of heterogeneous catalytic ozonation, electrocatalysis in respect of novel electrodes and electro-Fenton method, photoelectrocatalysis process and photoelectron-Fenton in water purification. It was also an attempt to propose general ideas about mechanism and principle enhancing the catalytic efficiency for the degradation and the mineralization of organics in water.展开更多
以TiO_2/Ti为阳极,活性炭纤维(ACF)为阴极,建立新型光电-Fenton体系。采用Box-Behnken Design(BBD)响应曲面法设计实验,考察初始pH、反应时间、电流密度和曝气量4个因素及其交互作用对光电-Fenton体系中·OH生成量的影响,建立·...以TiO_2/Ti为阳极,活性炭纤维(ACF)为阴极,建立新型光电-Fenton体系。采用Box-Behnken Design(BBD)响应曲面法设计实验,考察初始pH、反应时间、电流密度和曝气量4个因素及其交互作用对光电-Fenton体系中·OH生成量的影响,建立·OH生成量与影响因素间的数学模型,并进行参数优化,探索光电-Fenton运行的最优参数值。研究表明,4因素对·OH生成量的影响强弱顺序为:pH>反应时间>电流密度>曝气量,且4因素两两之间均存在一定的交互作用,其中反应时间与pH和曝气量之间的交互效应尤为显著。在pH 4.49、反应时间130.49 min、电流密度6.99 m A·cm-2、曝气量1 474.90 m L·min^(-1)条件下,·OH的生成量最大。经实验验证,实际值与模型预测值拟合性良好,偏差仅为2.35%。展开更多
ZnFe2O4 nanoparticles （ZFNPs） were developed as catalyst for the degradation of benzotriazole （BTA） by heterogeneous photoelectro- Fenton （PE-Fenton） like process. ZFNPs were prepared by a co-precipitation proce...ZnFe2O4 nanoparticles （ZFNPs） were developed as catalyst for the degradation of benzotriazole （BTA） by heterogeneous photoelectro- Fenton （PE-Fenton） like process. ZFNPs were prepared by a co-precipitation process and then characterized with transmission electron microscopy （TEM）, X-ray fluorescence （XRF）, X-ray diffraction （XRD） and BET surface area. Using such ZFNPs as catalyst, the degradation of BTA was investigated. Due to the high catalytic activity of ZFNPs, PE-Fenton like process showed efficient degradation of BTA. The influencing factors such as pH, dosage of ZFNPs, applied potential and initial concentration of BTA were systematically investigated. Under the optimum conditions, 91.2% of BTA was removed after 180 rain treatment.展开更多
文摘Catalytic technologies have been paid increasing attention in refractory pollutants abatement due to its practical and potential values in water purification. As effective and efficient approaches for water purification, Fenton＇s reagent, ozonation, electrochemical and photocatalytic methods have been widely studied and applied in different aspects and have been reviewed by several articles. In recent years, some novel catalytic processes based on above processes have been developed for enhancing the efficiency of removing the organics from water. This review emphasized on the recent development of heterogeneous catalytic ozonation, electrocatalysis in respect of novel electrodes and electro-Fenton method, photoelectrocatalysis process and photoelectron-Fenton in water purification. It was also an attempt to propose general ideas about mechanism and principle enhancing the catalytic efficiency for the degradation and the mineralization of organics in water.
文摘以TiO_2/Ti为阳极,活性炭纤维(ACF)为阴极,建立新型光电-Fenton体系。采用Box-Behnken Design(BBD)响应曲面法设计实验,考察初始pH、反应时间、电流密度和曝气量4个因素及其交互作用对光电-Fenton体系中·OH生成量的影响,建立·OH生成量与影响因素间的数学模型,并进行参数优化,探索光电-Fenton运行的最优参数值。研究表明,4因素对·OH生成量的影响强弱顺序为:pH>反应时间>电流密度>曝气量,且4因素两两之间均存在一定的交互作用,其中反应时间与pH和曝气量之间的交互效应尤为显著。在pH 4.49、反应时间130.49 min、电流密度6.99 m A·cm-2、曝气量1 474.90 m L·min^(-1)条件下,·OH的生成量最大。经实验验证,实际值与模型预测值拟合性良好,偏差仅为2.35%。
基金supported by the National Natural Science Foundation of China (No. 20977037)the Fundamental Research Funds for the Central Universities (No.2011TS062)
文摘ZnFe2O4 nanoparticles （ZFNPs） were developed as catalyst for the degradation of benzotriazole （BTA） by heterogeneous photoelectro- Fenton （PE-Fenton） like process. ZFNPs were prepared by a co-precipitation process and then characterized with transmission electron microscopy （TEM）, X-ray fluorescence （XRF）, X-ray diffraction （XRD） and BET surface area. Using such ZFNPs as catalyst, the degradation of BTA was investigated. Due to the high catalytic activity of ZFNPs, PE-Fenton like process showed efficient degradation of BTA. The influencing factors such as pH, dosage of ZFNPs, applied potential and initial concentration of BTA were systematically investigated. Under the optimum conditions, 91.2% of BTA was removed after 180 rain treatment.
