摘要
选择偶氮染料橙黄Ⅱ和Cr(Ⅳ)为对象,以染料氧化脱色速率和Cr(Ⅵ)还原速率为指标,定量研究了β-环糊精(β-CD)对TiO_2光催化氧化还原能力的强化效果。结果表明,β-CD在TiO_2上存在表面吸附,最大吸附量在TiO_2等电点附近。β-CD可提高TiO_2对橙黄Ⅱ的光催化氧化速率和对Cr(Ⅵ)的光催化还原速率,氧化还原速率分别提高22.3和8.0倍,速率的提高与溶液的pH值有关。
Azo dye Orange Ⅱand K_2Cr_2O_7 solution were used as objects to investigate the effect of TiO_2 photocatalytic redox ability in the presence of β-cyclodextrin(β-CD) based on the quantification of the rates of dye decolouration and Cr( Ⅵ ). The experiment results showed that β-CD was adsorbed on TiO_2 surface and the maximal adsorption was obtained when the pH value of the object solution equals( isoelectric point). The oxidation rates of the Orange Ⅱ and deoxidization rates of Cr(Ⅵ) catalyzed by TiO_2 mixed with β-CD were 22.3 and 8.0 times, respectively of the neat TiO_2 solution related to value of pH of the solution.
出处
《应用化学》
CAS
CSCD
北大核心
2004年第4期348-351,共4页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(20177017)
