改性沸石对废水中Cu2+、Cr3+的去除作用研究

摘要

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.%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+、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、投加量以及初始浓度条件下，改性斜发沸石对Cu2+、Cr3+的去除效果。实验结果表明：改性沸石与水样中Cu2+、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。