腐植酸对Pb^(2+)、Ni^(2+)、Cr^(6+)吸附性能的研究

Study on Adsorption Performance of Humic Acid on Pb(Ⅱ),Ni(Ⅱ),Cr(Ⅵ)

研究了不溶性腐植酸对废水中重金属离子Pb2+、Ni2+、Cr6+的吸附性能及其影响因素,通过对反应接触时间、pH、初始浓度等影响因子的实验比较,确定了最佳反应条件,并分别以Frendlich方程和Langmuir方程拟合了不溶性腐植酸对以上3种离子的吸附等温线。结果显示,腐植酸对Pb2+、Ni2+的吸附等温线符合Frendlich方程,属于Frendlich吸附,而对Cr6+的吸附等温线符合Langmuir方程,属于Langmuir吸附。此外,通过实验证明重金属在不溶性腐植酸上的吸附主要以物理吸附为主。不溶性腐植酸对重金属离子具有强烈的吸附作用且吸附率稳定,可广泛用于去除污水中的重金属离子。

In this paper,the adsorption performance of insoluble humic acid(IHA) on Pb2+,Ni2+ and Cr6+,and its influence factors,such as reaction time,pH and primary concentrations were investigated,and the optimum reaction conditions were determined. Meantime,this paper analyzed the adsorption experimental data using two different isotherm models of Langmuir and Frendlich. The results showed that Frendlich isotherm equation was fitted for adsorption of IHA on Pb(Ⅱ) and Ni(Ⅱ),and Langmuir isotherm equation was fitted for that of Cr(Ⅵ). The adsorption type of IHA on Pb(Ⅱ),Ni(Ⅱ) and Cr(Ⅵ) was physisorption. IHA was a potentially effi cient absorbent to purify water contaminanted with heavy metals.