三波长分光光度法研究纳米TiO_2对Hg^(2+)的光催化还原效果  

Study on the Effect of Photocatalytic Reduction of Hg^(2+) by Using Nano TiO_2 with Three-Wavelength Spectrophotometry

作　　者：陆薇薇[1] 陈国松[1] 张红漫[1] 张之翼[1] 陆小华[2] 

机构地区：[1]南京工业大学应用化学系,江苏南京210009 [2]南京工业大学化学化工学院,江苏南京210009

出　　处：《感光科学与光化学》2007年第3期230-237,共8页Photographic Science and Photochemistry

基　　金：国家杰出青年科学基金(29925616);国家自然科学基金(20246002;20236010);江苏省2003年环保科技计划项目(2003025)资助

摘　　要：利用自制微型纳米TiO2光催化反应器对不同初始浓度的Hg2+溶液进行光催化还原实验,利用Hg2+-硫氰酸盐-罗丹明B离子缔合物分光光度法测定溶液中剩余Hg2+的浓度,表征Hg2+的光催化还原效果.采用三波长分光光度法有效地消除了TiO2悬浮体系中的浑浊对测定的干扰.讨论了光催化还原的最佳条件及其在消除工业废水中有毒物质Hg(Ⅱ)方面的应用.结果表明:纳米TiO2对低浓度Hg2+溶液光催化还原效果显著,还原率可达90%以上,并且可以大幅降低工业废水中Hg(Ⅱ)的浓度.A self-made micro-reactor of nano-TiO2 photocatalysis was used to carry out photocatalytic reduction experiments of Fig（ Ⅱ） with different initial concentrations. Then the residual Fig（ Ⅱ ） in the solutions was determined by using spectrophotometry with Thiocyanate-Rhodamine B- Polyvinyl Alcohol. Considering the influence of TiO2 suspension system on the absorbency, three- wavelengths spectrophotometry was proposed to eliminate the interference of TiO2. The optimum conditions and effect of photocatalytic reduction of Hg2 ＋ by TiO2 as well as its application in removing toxic Fig（ Ⅱ ） in industrial waste water samples were investigated. It was showed that photo- catalytic reduction of Fig2＋ by TiO2 had a remarkable effect on low concentrations of mercury and the reduction rate was over 90 %. The method could dramatically reduced the content of toxic Fig（ Ⅱ ） in industrial waste water samples.

关 键 词：HG^2+ 纳米TIO2 光催化 微型反应器 三波长法 

分 类 号：O644.1[理学—物理化学]