Micro/mesoporous powder structures and biofouling of marine microorganisms directly limit the potential of zeolite frameworks in uranium recovery from seawater.Herein,an anti-biofouling zeolite framework-8/chitosan/me...Micro/mesoporous powder structures and biofouling of marine microorganisms directly limit the potential of zeolite frameworks in uranium recovery from seawater.Herein,an anti-biofouling zeolite framework-8/chitosan/melamine sponge adsorbent with a three-dimensional porous structure was prepared successfully using zinc ions and chitosan as adjuvants to promote the growth of zeolite framework-8 on the surface of melamine sponge.The mechanical and anti-biofouling properties of the sponge were determined by compression and algae tests.Relative to the zeolite framework-8 powders,the zeolite framework-8/chitosan/melamine sponge exhibited superior mechanical and anti-biofouling properties with 0.565 MPa of compressive stress and a 35%algae cell death rate.The adsorption capacities of the zeolite framework-8/chitosan/melamine sponge were 129.90 mg g^(−1) at pH 8.0 and 95.47 mg g^(−1) at the fifth adsorption–desorption cycle,which were higher than that of ZIF-8 powder(91.45 mg g^(−1)).Furthermore,the excellent low-concentration U(Ⅵ)adsorption performance of zeolite framework-8/chitosan/melamine in natural seawater(Bohai)also confirmed its practical application potentiality.展开更多
基金supported by the Funding for school-level research projects of Yancheng Institute of Technology(xjr2021034)the National Natural Science Foundation of China(NSFC 21905066 and NSFC 51872057).
文摘Micro/mesoporous powder structures and biofouling of marine microorganisms directly limit the potential of zeolite frameworks in uranium recovery from seawater.Herein,an anti-biofouling zeolite framework-8/chitosan/melamine sponge adsorbent with a three-dimensional porous structure was prepared successfully using zinc ions and chitosan as adjuvants to promote the growth of zeolite framework-8 on the surface of melamine sponge.The mechanical and anti-biofouling properties of the sponge were determined by compression and algae tests.Relative to the zeolite framework-8 powders,the zeolite framework-8/chitosan/melamine sponge exhibited superior mechanical and anti-biofouling properties with 0.565 MPa of compressive stress and a 35%algae cell death rate.The adsorption capacities of the zeolite framework-8/chitosan/melamine sponge were 129.90 mg g^(−1) at pH 8.0 and 95.47 mg g^(−1) at the fifth adsorption–desorption cycle,which were higher than that of ZIF-8 powder(91.45 mg g^(−1)).Furthermore,the excellent low-concentration U(Ⅵ)adsorption performance of zeolite framework-8/chitosan/melamine in natural seawater(Bohai)also confirmed its practical application potentiality.
