不同离子交联海藻酸盐水凝胶膜活化过硫酸盐对染料的快速去除OA

In order to solve the problem that the heterogeneous catalytic system of traditional advanced oxidation technology has low mass transfer efficiency and reduces its catalytic effect on pollutants,alginate(MAlg)hydrogel films with different transition metal ions(Co2+,Ni2+,Cu2+,and Zn2+)were prepared by using sodium alginate(NaAlg)as membrane material.Combined with membrane separation technology and persulfate advanced oxidation technolo-gy,the mass transfer process was accelerated by cross-flow filtration,and the degradation performance of the membrane on Orange G(OG)dye was investigated.The species of free radicals in the catalytic system were iden-tified by radical quenching experiment and electron paramagnetic resonance(EPR).The results showed that the cobalt alginate(CoAlg)hydrogel film had the best catalytic performance,and the dye removal rate was close to 100%within 1 min,indicating that the application of membrane separation technology significantly improved the catalytic degradation performance.In the catalytic system,sulfate radical(SO4·-)and hydroxyl radical(·OH)play a leading role.