膨润土对Cd<sup>2+</sup>的吸附作用及影响因素

膨润土对Cd²⁺的吸附作用及影响因素

摘要: 研究了盐亭钙基膨润土的理化性质及其对Cd²⁺的吸附作用。实验研究结果表明, 该膨润土对重金属离子Cd²⁺有较好的吸附作用, 吸附作用受溶液 pH值影响明显。膨润土对重金属离子的吸附主要通过离子交换作用进行, 增加膨润土吸附剂添加量或加大溶液中Cd²⁺浓度, 均有利于提高膨润土对Cd²⁺的吸附总量。膨润土对Cd²⁺的吸附模式符合Frendlish方程。

Abstract: The paper has studied the physical-chemical properties of Ca-bentonite in Yanting and adsorption to Cd²⁺ in solution.The study shows that bentonite has a good adsorption to Cd²⁺ and adsorption is affected by pH of solution.Bentonite adsorb heavy mental by iron exchange.It is advantageous to adsorption of Cd²⁺ that adsorbent or consistency of solution is increased.Adsorb model of bentonite to Cd²⁺ is belong to Frendlish adsorption equation.