介孔钛硅分子筛的表面化学特征及除铅机制研究

Surface characteristics and adsorption mechanism of Pb 2+ on mesoporous titanosilicate molecular sieve

以表面活性剂在水溶液中形成的液晶相为模板剂，考察了钛含量对制备介孔钛硅分子筛性质的影响；应用表面络合反应关系式计算了介孔钛硅分子筛表面络合反应的基本特征参数．研究了溶液ｐＨ 值、温度等对Ｐｂ２＋ 离子在介孔钛硅分子筛表面吸附的影响；并就Ｐｂ２＋ 离子在介孔钛硅分子筛表面的吸附动力学。

Mesoporous titanosilicate molecular sieve samples in the presence of (CTMA)Br were prepared,and the effect of Si/Ti molar ratio on the characteristics of the samples was investigated.A simplified surface complexation model was used to calculate the conditional binding constants for surface complexation of Pb 2+ on mesoporous titanosilicate molecular sieve.Adsorption characteristics of Pb 2+ on the sample were also studied as a function of pH and temperature.Finally,the dynamics,isotherms and mechanism of the adsorption for Pb 2+ were discussed.