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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
引用本文:陆薇薇,陈国松,张红漫,张之翼,陆小华.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[J].影像科学与光化学,2007,25(3).
作者姓名:陆薇薇  陈国松  张红漫  张之翼  陆小华
基金项目:国家自然科学基金 , 国家自然科学基金 , 江苏省环保科研项目
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.

关 键 词:Hg2+  纳米TiO2  光催化  微型反应器  三波长法

Study on the Effect of Photocatalytic Reduction of Hg2+ by Using Nano TiO2 with Three-Wavelength Spectrophotometry
LU Wei-wei,CHEN Guo-song,ZHANG Hong-man,ZHANG Zhi-yi,LU Xiao-hua.Study on the Effect of Photocatalytic Reduction of Hg2+ by Using Nano TiO2 with Three-Wavelength Spectrophotometry[J].Imaging Science and Photochemistry,2007,25(3).
Authors:LU Wei-wei  CHEN Guo-song  ZHANG Hong-man  ZHANG Zhi-yi  LU Xiao-hua
Abstract:A self-made micro-reactor of nano-TiO2 photocatalysis was used to carry out photocatalytic reduction experiments of Hg(Ⅱ) with different initial concentrations.Then the residual Hg(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 Hg(Ⅱ) in industrial waste water samples were investigated.It was showed that photocatalytic reduction of Hg2+ 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 Hg(Ⅱ) in industrial waste water samples.
Keywords:Hg2+  nano-TiO2  photocatalysis  micro-reactor  three-wavelength spectrophotometry
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