Solar photocatalytic degradation of azo dye:: comparison of photocatalytic efficiency of ZnO and TiO2
Solar photocatalytic degradation of azo dye:: comparison of photocatalytic efficiency of ZnO and TiO2
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DOI：
10.1016/s0927-0248(02)00255-6
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发表时间：
2003-04-30
影响因子：
6.9
通讯作者：
Murugesan, V
中科院分区：
文献类型：
--
作者：
Sakthivel, S;Neppolian, B;Murugesan, V
研究了商品ZnO粉体的光催化活性，并与Degussa P25 TiO 2的光催化活性进行了比较。以酸性棕14为模型污染物，对ZnO和TiO 2催化剂的性能进行了评价。以太阳光为能源进行光催化实验，考察了催化剂的比表面积、粒径和结晶度。研究了染料初始浓度、催化剂负载量、光照时间、pH值、ZnO和TiO 2对酸性棕14的吸附、光强度等因素的影响，并比较了不同商业催化剂的光催化活性。采用高效液相色谱法（HPLC）监测底物浓度的变化，紫外-可见分光光度计（UV-VIS）测定吸光度，研究了酸性棕14的光催化降解过程。光降解率进行了测定，每个实验和观察到的最高值的ZnO表明，它吸收大部分的太阳光谱和吸收更多的光量子比TiO 2的完全矿化证实了总有机碳（TOC）分析，COD测量和估计的无机离子，如NH 4+，NO3，Cl-和SO 42-的形成。(C)2002 Elsevier Science B. V.保留所有权利。
The photocatalytic activity of commercial ZnO powder has been investigated and compared with that of Degussa P25 TiO2. Laboratory experiments with acid brown 14 as the model pollutant have been carried out to evaluate the performance of both ZnO and TiO2 catalysts. Solar light was used as the energy source for the photocatalytic experiments, These catalysts were examined for surface area, particle size and crystallinity. The effect of initial dye concentration, catalyst loading, irradiation time, pH, adsorption of acid brown 14 on ZnO and TiO2 intensity of light and comparison of photocatalytic activity with different commercial catalysts were Studied. The progress of photocatalytic degradation of the acid brown 14 has been observed by monitoring the change in substrate concentration of the model compound employing HPLC and measuring the absorbance in UV-Visible spectrophotometer for decolourisation. The photodegradation rate was determined for each experiment and the highest values were observed for ZnO suggesting that it absorbs large fraction of the solar spectrum and absorption of more light quanta than TiO2 The complete mineralisation was confirmed by total organic carbon (TOC) analysis, COD measurement and estimation of the formation of inorganic ions such as NH4+, NO3, Cl- and SO42-. (C) 2002 Elsevier Science B.V. All rights reserved.