ZSM-5沸石对水溶液中铅离子的吸附性能

Adsorption Properties of ZSM-5 Zeolite on Lead Ions in Water

研究了ZSM-5沸石对水溶液中铅离子(Pb^(2+))的吸附性能,考察了pb^(2+)初始浓度、吸附剂用量、pH值和吸附时间等因素对吸附的影响。结果表明:ZSM-5沸石对水溶液中铅离子有较好的去除效果,当其用量为40g/L时,水溶液中铅离子的吸附去除率达到96.09%;吸附过程在180 min时达到吸附平衡;溶液pH值和初始浓度对水溶液中铅离子的去除也有显著的影响,中性和碱性条件下的去除率大于酸性时的去除率;平衡吸附量与吸附平衡浓度之间的关系较好符合Freundlich和Langmuir等温吸附方程所描述的规律。

The adsorpton properties of ZSM -5 zeolite on lead ions （Pb^2＋ ） were studied, and the influence of the factors including the initial concentration of Pb^2＋ , the dosage of zeolite, pH value and the adsorption time on the adsorption result, were investigated, respectively. The results were as follows： ZSM -5 zeolite possessed good adsorbability for Pb^2＋ in aqueous solution. The adsotption rate of Pb^2＋ ions could attain up to 96.09% with a ZSM -5 zeolit concentration of 40 g/L. The adsorption process reached balance after 180 min. Moreover, the pH value and the initial concentration of Pb^2＋ ions had distinct effects on the adsorption result, and the removal rates of the Pb^2＋ ions in neutral and alkaline solution were higher than that in acidic solution. The relationship between the adsorbing capacity and equilibrium mass con- centration was in good accordance with the isotheimal adsorption equations of Freundlich and Langmuir, respectively.