Pure analcime zeolite is successfully synthesized from spent glass via a hydrothermal method,and its adsorption capacity on heavy metals such as Pb2+,Cd2+and Cu2+from wastewater is studied.The impacts of pH value,conditioning temperature and contact duration on the adsorption amount are investigated through batch experiment.It is found that the initial pH has a significant impact on the adsorption capacity,while the temperature has a small influence on the equilibrium adsorption capacity.Accordingly,the optimal process parameters for the adsorption of Pb2+,Cd2+and Cu2+by analcime zeolite are obtained,and their adsorption process is fitted by means of Langmuir isotherm model.It is verified that the adsorption process belongs to homogeneous monolayer adsorption,the adsorption kinetic characteristics fits the quasi-secondary kinetic equation better,confirming that the process is mainly realized through ion exchange,chemical adsorption and surface complexing.This study provides a low-cost and high-efficiency method for the re-utilization of spent glass and the removal of heavy metals in wastewater.
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