Effects of monometallic and bimetallic Au–Ag supported on sol–gel TiO2 on photocatalytic degradation of 4-chlorophenol and its intermediates
Effects of monometallic and bimetallic Au–Ag supported on sol–gel TiO2 on photocatalytic degradation of 4-chlorophenol and its intermediates
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DOI：
10.1016/j.desal.2011.01.016
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发表时间：
2011-05
期刊：
影响因子：
9.9
通讯作者：
Piriyaporn Wongwisate;S. Chavadej;E. Gulari;T. Sreethawong;P. Rangsunvigit
中科院分区：
文献类型：
--
作者：
Piriyaporn Wongwisate;S. Chavadej;E. Gulari;T. Sreethawong;P. Rangsunvigit
采用溶胶-凝胶法制备了TiO 2、Au/TiO 2、Ag/TiO 2和Au-Ag/TiO 2光催化剂，研究了它们对4-氯苯酚（4-CP）的光催化降解。实验在间歇式反应器中进行，其中光催化剂悬浮在反应溶液中，在11-W低压汞灯的照射下发射200- 280 nm波长范围内的UV光。通过高效液相色谱（HPLC）和总有机碳（TOC）分析仪对反应溶液进行定性分析。还测定了从4-CP降解获得的中间体的量。结果表明，负载少量（0.1%）的Au或Ag均能显著提高TiO 2的光催化活性，而负载0.1%的Au对TiO 2的光催化活性影响不大，其光催化活性与负载0.1% Ag/TiO 2的光催化活性基本相同。而0.1%Ag/TiO 2和Au-0.1%Ag/TiO 2的光催化活性最高。
In this work, photocatalytic degradation of 4-chlorophenol (4-CP) was investigated using TiO2, Au/TiO2, Ag/TiO2, and Au–Ag/TiO2photocatalysts prepared by a sol–gel method. Experiments were carried out in a batch reactor with a photocatalyst suspended in a reaction solution under irradiation from an 11-W low-pressure mercury lamp emitting UV light in the wavelength range of 200–280nm. Qualitative analysis of the reaction solution was performed by means of both a high performance liquid chromatograph (HPLC) and a total organic carbon (TOC) analyzer. The amounts of intermediates obtained from the 4-CP degradation were also determined. The results showed that the loading of a small amount (0.1%) of either Au or Ag onto the TiO2significantly improved the photocatalytic activity, but the loading of 0.1% Au onto the 0.1% Ag/TiO2slightly affected the photocatalytic activity, exhibiting almost the same photocatalytic activity as the host 0.1% Ag/TiO2. However, both the 0.1% Ag/TiO2and 0.1% Au–0.1% Ag/TiO2provided the highest photocatalytic activity in terms of TOC reduction.