盐酸改性凹凸棒石条件对去除Cd^(2+)效果的影响

Influencing factors of Cd^(2+) removal by HCl modified attapulgite

以去除微污染原水中Cd2+为例,对经过高温预处理的天然凹凸棒石进行盐酸改性,考察了酸化浓度、酸化温度以及酸化时间对凹凸棒石去除Cd2+效果的影响。结果表明:最佳预处理温度为300℃;盐酸改性凹凸棒石的最佳酸化浓度为3 mol/L,最佳酸化温度为60℃,最佳酸化时间为2.0 h;在此条件下,盐酸改性凹凸棒石对水体中Cd2+的去除效果最好,去除率达到92.6%。

Natural attapulgite pretreated with high temperature was modified by HC1 and used to treat micro-polluted raw water, the influences of concentration, temperature and time of acidification on Cd2 re moval by the modified attapulgite were investigated. The results showed that, the optimal pretreatment tempera ture was 300 ℃, the optimal concentration, temperature and time of the acidification were 3 mol/L, 60 ℃, and 2.0 h respectively. Under the above condition, the highest removal rate of Cd2＋ by HC1 modified attapulgite could be obtained, and the removal rate reached 92.6%.