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【期刊论文】Kinetic modeling of electro-Fenton reaction in aqueous solution
刘鸿, H. Liua, X.Z. Li b, *, Y.J. Leng c, C. Wang a
WATER RESEARCH 41 (2007) 1161-1167,-0001,():
-1年11月30日
To well describe the electro-Fenton (E-Fenton) reaction in aqueous solution, a new kinetic model was established according to the generally accepted mechanism of E-Fenton reaction. The model has special consideration on the rates of hydrogen peroxide (H2O2) generation and consumption in the reaction solution. The model also embraces three key operating factors affecting the organic degradation in the E-Fenton reaction, including current density, dissolved oxygen concentration and initial ferrous ion concentration. This analytical model was then validated by the experiments of phenol degradation in aqueous solution. The experiments demonstrated that the H2O2 gradually built up with time and eventually approached its maximum value in the reaction solution. The experiments also showed that phenol was degraded at a slow rate at the early stage of the reaction, a faster rate during the middle stage, and a slow rate again at the final stage. It was confirmed in all experiments that the curves of phenol degradation (concentration vs. time) appeared to be an inverted ‘‘S’’ shape. The experimental data were fitted using both the normal first-order model and our new model, respectively. The goodness of fittings demonstrated that the new model could better fit the experimental data than the first-order model appreciably, which indicates that this analytical model can better describe the kinetics of the E-Fenton reaction mathematically and also chemically.
E-Fenton, H2O2, Kinetic Model, Phenol
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刘鸿, 冷文华, 吴合进, 成少安, 吴鸣, 张鉴清, 李文钊, 曹楚南
催化学报,2000,21(3):209~212,-0001,():
-1年11月30日
建立了以刮浆工艺制得的TiO2/Ni为工作电极、泡沫镍为对电极、饱和汞电极为参比电极的光电催化反应体系,研究了在磺基水杨酸(SSal)的光电催化降解过程中,外加电压和溶液pH值对降解速度的影响。实验发现,外加阳极偏压为700mV时,SSal能发生有效降解,降解速率受溶液pH值的影响;随着SSal降解的进行,阴极表面电阻出现较大的变化,另外还研究了SSal光电催化降解过程中的电流变化特征。
二氧化钛, 光电催化, 泡沫镍, 磺基水杨酸, 降解反应
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刘鸿, 肖羽堂, 陈拥军, 张晶晶, 孙承林, 吴鸣
中国给水排水,2002,18(7):48~50,-0001,():
-1年11月30日
采用光-fenton试剂预处理低浓度H酸废水(COD为300~500mg/L、色度为400~600倍、pH值为4.5~5.5)的试验结果表明,在最佳预处理条件[pH值为5、FeSO4(10g/L)用量为0.5%、H2O2(3%)用量为2.2%、催化剂m-TiO2的用量为0.02%、反应时间为90min]下对COD的去除率为52.4%~62.7%,对色度的去除率>82%,废水的CODp/COD值显著提高。
Fenton试剂, 光催化氧化, H酸废水
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刘鸿, 吴合进, 吴鸣), 谢茂松, 杨民, 孙福侠, 杜鸿章
分子催化,2000,14(4):241~242,-0001,():
-1年11月30日
A three dimensional electro assisted photocatalytic system was constituted with granular TiO2 as the photocatalyst. The photocatalydc efficiency of phenol degradation was observed to be 10% and 33.6%, respectively, for common water electrolysis and photocatalysis, while it is increased to 82.8% for the combination of them i. e., the electro assisted photocatalytic system. According to the experimental results, both water electrolysis and anode bias were considered to be responsible for the electro synergism, which may effectively provide active oxygen source and prevent further recombination of photo generated charges.
光催化, 电助协同效应, 有机物降解, TiO2, 立体电极
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刘鸿, Junxi Liu a, Hong Liu a, ∗, Chuan Wang a, Xiangzhong Li b, Yexiang Tong a, Xiaoli Xuana, b, Guofeng Cui a
Journal of Hazardous Materials 151 (2008) 761-769,-0001,():
-1年11月30日
The conventionally employed zero-valent iron (Fe0) particles suffer a formation of surface oxides to lower their activity prior to use. During their using process for contaminant remediation, such oxide formation is also encountered, while the cumbersome handling of particles impedes the Fe0 recovery. To conquer the drawbacks, a Fe0 film was synthesized by electrodepositing ferrous ion cathodically on titanium (Ti) substrate to form a new Fe0/Ti system. X-ray diffraction (XRD) revealed that the freshly electrodeposited (FED) Fe0 film was free of oxides, which was attributed to the particularity of electrodeposition procedure. Reduction results of 10.0 mg/L chromium [Cr(VI)] indicated that the FED Fe0 film had higher activity than the oxide-covered counterpart. Further analysis of the pH-dependent Cr(VI) reduction reaction indicated that the Fe0/Ti system kept its activity and could be reused for further Cr(VI) reduction at pH 3.0 and 4.0, while it was inactivated at pH 5.0 and 7.0. Due to the easy handling of Fe0/Ti system, the inactivated Fe0 was recovered significantly through a cathodic reduction.
Zero-valent iron, Electrodeposition, Surface oxides, Chromium(, VI), , Reduction
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