β-环糊精修饰二氧化钛吸附Cd2+的研究
首发时间:2013-07-26
摘要:以β-环糊精和二氧化钛等为原料,制备出经β-环糊精修饰的二氧化钛P25-S1-CD。然后将P25-S1-CD与未经β-环糊精修饰的P25对比,在一定条件下,P25-S1-CD可有效提高对Cd2+的吸附率。同时考察了P25-S1-CD剂量、pH值和Cd2+初始浓度对Cd2+吸附效率的影响。结果表明: P25-S1-CD对Cd2+吸附率随P25-S1-CD的投加量的增加而增加,随初始pH的升高而上升,随Cd2+的初始浓度增加而降低。当Cd2+初始浓度为0.5mg/L-2.5mg/L范围时,对P25-S1-CD吸附Cd2+相关数据进行拟合,其线性关系较好(R2>0.99),符合准二级动力学方程。
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Adsorption of cadmium ions in aqueous solutions in the presence of titanium dioxide modified by β-cyclodextrin
Abstract:β-cyclodextrin and TiO2 were taken as raw materials, were then synthesized into titanium dioxide modified by β-cyclodextrin (P25-S1-CD). Compared with P25, the adsorption rate of Cd2+ by P25-S1-CD could effectively been improved under certain conditions. The effects of P25-S1-CD dosage, initial pH and Cd2+ concentration on the adsorption of Cd2+ were also investigated. The results showed that the adsorption rate of Cd2+ increased with the increase of P25-S1-CD and initial pH,and decreased with the increase of Cd2+ concentration. When the concentration of Cd2+ within 0.5mg/L-2.5mg/L, the adsorption rate of the Cd2+ fitted pseudo-second order kinetic equation well (R2>0.99), which indicated that the adsorption kinetic process was in accordance with pseudo-second order kinetic equation.
Keywords: β-cyclodextrin Modified TiO2 Adsorption Cd2+
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