纳米氧化锌改性蛭石对Pb2+的吸附性能研究

摘要

通过将天然蛭石加入硫酸锌的碱性溶液中,制得纳米氧化锌改性蛭石,研究了该类改性蛭石对Pb2+的吸附动力学和热力学效果,并得出以下结论:(1)纳米氧化锌改性蛭石对Pb2+的吸附动力学可用准二级动力学方程描述;(2)对Pb2+的吸附等温线均符合Langmuir和Freundlich方程;(3)pH在6~7时,对Pb2+的吸附平衡量达48 mg/g;(4)对Pb2+的吸附效果比天然蛭石好,平衡吸附量提高40%.实验表明,纳米氧化锌改性蛭石可以有效处理含铅废水.%The adsorption kinetics and thermodynamic effects of the modified vermiculite on Pb2+ were studied by adding natural vermiculite to alkaline solution of zinc sulfate.The following conclusions were drawn: The adsorption kinetics of Pb2+ modified by nano-zinc oxide-modified vermiculite can be described by quasi-second order kinetic equation.The adsorption isotherms of Pb2+ were in accordance with the Langmuir and Freundlich equations.In pH 6~7, the adsorption of Pb2+ balance quantity was up to 48 mg/g.The adsorption of Pb2+ effect was better than natural vermiculite, equilibrium adsorption capacity increased by 40%.The experimental results showed that nano-zinc oxide-modified vermiculite can effectively lead wastewater treatment.