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In order to reduce the loss of particles during the cycling operation, a technology for the granulation of short channel SBA-15 adsorbent was developed. The adsorption behavior of obtained granules was studied under various factors including initial pH value, contact time in different initial concentration and acid stability by batch experiments. A continuous packed column loaded with granules was performed to remove U(VI) from aqueous solution. The uranium concentration was highly enriched than feed solution. The granules packed in column exhibited excellent reusability through cycling test. The result showed promising application prospect in the uranium extraction from aqueous solution. [ABSTRACT FROM AUTHOR]

A new bio-inspired method was applied in this study to simultaneously improve the monovalent anion selectivity and antifouling properties of anion exchange membranes (AEMs). Three-layer architecture was developed by deposition of polydopamine (PDA) and electro-deposition of N-O-sulfonic acid benzyl chitosan (NSBC). The innermost and outermost layers were PDA with different deposition time. The middle layer was prepared by NSBC. Fourier transform infrared spectroscopy and scanning electron microscopy confirmed that PDA and NSBC were successfully modified on the surfaces of AEMs. The contact angle of the membranes indicated an improved hydrophilicity of the modified membranes. A series of electrodialysis experiments in which Cl−/SO42− separation was studied, demonstrating the monovalent anion selectivity of the samples. The Cl−/SO42− permselectivity of the modified membranes can reach up to 2.20, higher than that of the commercial membrane (only 0.78) during 90 minutes in electrodialysis (ED). The increase value of the resistance of the membranes was also measured to evaluate the antifouling properties. Sodium dodecyl benzene sulfonate (SDBS) was used as the fouling material in the ED process and the membrane area resistance of modified membrane increase value of was only 0.08 Ωcm2 30 minutes later. [ABSTRACT FROM AUTHOR]