摘要：

用NaOH碱熔-水热法处理得到的改性斜发沸石作为吸附交换剂,对模拟废水中以Cu²⁺尧Cr³⁺为代表的重金属离子进行吸附处理.研究了不同吸附时间尧投加量以及初始浓度条件下,改性斜发沸石对Cu²⁺尧Cr³⁺的去除效果.实验结果表明:改性沸石与水样中Cu²⁺尧Cr³⁺的质量比分别为18.75:1、13.33:1 时,对Cu²⁺、Cr³⁺的去除率分别达88.0%、87.4%,且为快速吸附平衡过程.此外,用NaCl 溶液和NaCl 溶液加氨水对吸附Cu²⁺饱和的改性沸石进行再生实验,再生率较高,改性斜发沸石可以多次重复利用.

关键词: 改性沸石, 重金属离子, 吸附

Abstract:

The modified clinoptilolite,which was obtained by NaOH alkali fusion-hydrothermal treatment process, has been used as an adsorption exchanger. Adsorption treatment of heavy metal ions,represented by Cu²⁺,and Cr³⁺ in simulated wastewater is conducted. Under different conditions,such as adsorption time,dosages and initial concentration,the removing effects of modified clinoptilolite on Cu²⁺ and Cr³⁺ from water samples are studied. The experimental results show that the mass ratio of modified clinoptilolite and Cu²⁺,Cr³⁺ in water samples is 18.75:1 and 13.33:1,respectively,the Cu²⁺ and Cr³⁺ removing rates are 88.0% and 87.4%,respectively. It is a rapid adsorption equilibrium process. In addition,the regeneration experiment on modified chinoptilolite,which was saturated with Cu²⁺ by sodium chloride solution and sodium chloride solution+ammonia,has been accomplished. The regenerating rate is pretty high and modified clinoptilolite can be used repeatedly many times.

Key words: modified clinoptilolite, heavy metal ions, adsorption

中图分类号: 

• X703