Adsorption and regeneration characteristics of type-A molecular sieve synthesized from natural zeolite
SUN Tong, HAO Rui-xia, WU Xu-yuan, LI Jia-wen, LI Peng
Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
Abstract：The deep denitrification problem of sewage plant effluent was addressed using type-A molecular sieve, with high purity, regular crystalline shape, uniform size, and large adsorption capacity. It was prepared by hydrothermal synthesis using natural zeolite. The ammonia adsorption and regeneration properties of such zeolitic molecular sieve were examined, and the related mechanisms were analyzed from Zeta potential, FTIR and XRD results. The results showed that both the quasi-first and quasi-second order reaction kinetics could well represent the ammonia nitrogen adsorption process, which can be described by the Langmuir isothermal adsorption model. The maximum saturated adsorption capacity of ammonia nitrogen reached 41.68mg/g. The regeneration of molecular sieve with adsorption saturation was simple and easy, and its adsorption capacity could be recovered after desorption by 2mol/L NaCl solution. The regeneration rate was above 95% after five cycles of adsorption and desorption. Both the adsorption and regeneration were reversible processes of each other, involving ion exchange reactions of Na+ and NH4+. The application of zeolitic molecular sieves provided an economic and feasible new idea for the deep denitrification in sewage treatment plant.
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