分子筛对重金属废水吸附性能的实验研究

为验证分子筛对重金属废水的处理效果,以实际含锰废水为研究对象,采用13X分子筛,通过实验研究了吸附材料用量、吸附时间、搅拌转速和溶液pH对Ca2+、Mn2+、Mg2+吸附效果的影响。结果表明:吸附材料用量增加对Mn2+、Mg2+的吸附影响较大;随着吸附时间增长,各金属离子去除率增加;适当的转速有利于金属离子的吸附,但各金属离子对应的最佳转速各不相同;pH提高,能够促进分子筛对金属离子的吸附。13X分子筛对金属离子的吸附机理为离子交换吸附和表面吸附。研究表明,13X分子筛在处理低浓度含锰重金属废水方面表现出良好的应用前景。

Study on adsorption of heavy metals from wastewater by zeolite

In order to verify the treatment effect of zeolite to heavy metal bearing wastewater,taking the manganiferous wastewater as study object and 13X zeolite as the sorbent,the influences of dosage of adsorption material,adsorption time,stirring speed,and pH of the solution on the adsorption effect of Ca(Ⅱ),Mn(Ⅱ),and Mg(Ⅱ) were investigated.Results showed,the dosage of 13X zeolite had important effect on the adsorption of Mn(Ⅱ) and Mg(Ⅱ);with the increasing of adsorption time,the removal efficiency of various metals increased;proper stirring speed was beneficial to the adsorption,but the optimum stirring speeds were different to the 3 metals;and low pH had negative effect on the adsorption.The ion exchange and surface sorption were suggested to be the major adsorption mechanisms in the experiments.Results showed that 13X zeolite had extensive application prospects in disposing mangeniferous wastewater with low concentration.