| 纳米TiO_2光催化降解硝基酚类污染物动力学及机理的研究 |
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| 引用本文： | 常江,陈晖.纳米TiO_2光催化降解硝基酚类污染物动力学及机理的研究[J].环境工程学报,2009,3(1). |
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| 作者姓名： | 常江 陈晖 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所气体地球化学重点实验室,兰州,730000;兰州大学资源环境学院,兰州,730000
2. 兰州大学资源环境学院,兰州,730000 |
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| 基金项目： | 国家自然科学基金，甘肃省科技攻关项目 |
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| 摘 要： | 采用纳米TiO2(P25)粉末作为催化剂,研究了几种典型硝基取代酚在TiO2/UV悬浮体系下的光催化降解.研究表明,这些化合物的降解过程符合Langmuir-Hinshelwood动力学方程,其表观速率常数(kapp)的大小为:2-氨基-4硝基酚(2-A,4-NP)>4-硝基酚(4-NP)>2-硝基酚(2-NP)>3-硝基酚(3-NP)>2,4-二硝基酚(2,4-DNP)>2,4,6-三硝基酚(2,4,6-TNP),而吸附平衡常数(KL)却与Kapp成反比.苯环上取代基的种类和数日对有机物光催化降解活性有很大的影响,硝基的加入降低了光催化活性,并且kapp与Hammett常数(σ)具有较好的线性关系.
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| 关 键 词： | 光催化降解 动力学 反应机理 硝基酚 |
Photodegradation of nitrophenols in UV/TiO_2 suspension system: mechanistic and kinetic investigations |
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| Chang Jiang,Chen Hui.Photodegradation of nitrophenols in UV/TiO_2 suspension system: mechanistic and kinetic investigations[J].Techniques and Equipment for Environmental Pollution Control,2009,3(1). |
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| Authors: | Chang Jiang Chen Hui |
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| Institution: | 1.State Key Laboratory of Organic Geochemistry;Institute of Geology and Geophysics;Chinese Academy of Sciences;Lanzhou 730000;2.College of Earth and Environmental Science;Lanzhou University;Lanzhou 730000 |
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| Abstract: | The photocatalytic degradation of nitrophenols in TiO2/UV suspension system was studied.The results show that the degradation kinetics can be described by Langmuir-Hinshelwood expression,and the apparent rate constants(kapp) are in the order: 2-A,4-NP>4-NP>2-NP>3-NP>2,4-DNP>2,4,6-TNP.Whereas the adsorption equilibrium constants(KL) are in inverse proportion to the apparent rate constants(kapp).The substituents on the aromatic ring significantly influence the photocatalytic activity,the addition of the nitro... |
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| Keywords: | photocatalytic degradation kinetics reaction mechanism nitrophenols |
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