Adsorption Properties of Acid Modified Sludge-based Composite Ceramsite on Pb2+
The ceramsite was prepared by using sludge,phosphorus tailings and red mud as raw materials,then modified with hydrochloric acid,nitric acid and citric acid,and its adsorption effect on Pb2+in water was studied.The adsorption mechanism was analyzed by scanning electron microscope(SEM),surface groups,zero charge point(pHPZC)and Fourier infrared spectroscopy(FTIR).The results showed that the ceram-site modified with low concentration of hydrochloric acid or nitric acid had a good removal rate of Pb2+.The re-moval rate of Pb2+by citric acid modified ceramsite was lower than that of unmodified ceramsite.Acid modi-fied ceramsite had the characteristics of large specific surface area,developed pore structure,high content of acid groups and low isoelectric point.The ceramsite performed both physical and chemical adsorption on Pb2+,which could be used as treatment materials for Pb2+-containing wastewater.
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