Preparation and performances of chitosan/zeolite molecular sieve composite adsorbed particles

The optimum preparation method of chitosan/zeolite molecular sieve composite adsorbed particles was confirmed through the modified conditions for the removal of NH₄⁺-N and NO₃^--N simultaneously. And the surface physicochemical properties of the chitosan/zeolite molecular sieve composite adsorbed particles were analyzed by SEM, specific surface area (BET), FTIR and XPS, respectively. The results show that when the mixed solution of acetic acid and chitosan with the concentration of 4vol% and 7 g/L is vibrated for 10 h at the temperature of 30℃, the adsorption capacity of the prepared chitosan/zeolite molecular sieve particles for NH₄⁺-N and NO₃^--N is 0.636 mg/g and 1.952 mg/g and the removal rate reachs 81.60% and 40.28%, respectively. More protrusions and micropores are also found on the surface of chitosan/zeolite molecular sieve particles with the specific surface area of 391.52 m²/g. FTIR analysis shows that -NH₂ and -CH₃, the characteristic function groups of chitosan are already loaded into the basic framework of zeolite molecular sieve and the XPS analysis indicates that the element O1s plays an important role in the attachment of chitosan to zeolite molecular sieves. The findings of the research can provide a theoretical basis for the upgrading of water purification plant in the northern cold region.