China Nonferrous Metallurgy

To address the low efficiency of gallium extraction, the present study synthesized a gallium-imprinted chitosan resin with good adsorption performance for gallium by using chitosan as the carrier, grafting acrylic functional monomers through cross-linking of glutaraldehyde and combining with ion-imprinting technology, and characterized the functional groups and morphology on the surface of the resin with the help of FT-IR spectroscopy and scanning electron microscopy, studied the adsorption kinetic process of the synthesized resin in simulated dissolution solution by adsorption tests, and investigated the reusability of the synthetic resin. The adsorption kinetic process of the synthetic resin in the simulated dissolution solution, the effects of solution pH and competing ions on the adsorption performance of the resin, and the reusability of the synthetic resin were investigated by adsorption tests.The results showed that the surface of the gallium-imprinted resin formed a rough and porous structure; the adsorption of gallium by the resin conformed to the quasi-secondary kinetic model and the Langmuir adsorption isothermal model, and the adsorption process was a monomolecular layer adsorption mainly controlled by chemical adsorption, with the saturated adsorption capacity of 16.28mg·g^-1; the optimal use of this resin was in the pH range of 5~7; the adsorption selectivity of gallium for vanadium and aluminum was higher than that of gallium for the simulated dissolution solution. The optimal pH range of the resin was 5~7; the selectivity coefficients of gallium relative to vanadium and aluminum were 12.50 and 9.87, respectively, which showed better gallium adsorption performance; the adsorption capacity of the resin remained at 80% of the original capacity after repeating the adsorption and desorption cycles for seven times, which had a good reuse effe.