矿渣基碳粉-海藻酸钠复合膜的制备及其对水体中Cr(Ⅵ)的高效吸附OA

Sodium alginate was used as the matrix to load self-made slag-purified carbon powder,and a new type of slag-based carbon powder-sodium alginate composite membrane was prepared through double crosslinking with polyethyleneimine and glutaraldehyde.The aim was to treat waste with waste,to promote the value of slag as a resource,and to develop highly efficient and renewable adsorption materials to deal with Cr(Ⅵ)pollution in water.The adsorption performance,regeneration ability and applicability of the composite membrane for Cr(Ⅵ)to simulated wastewater were systematically investigated.The results showed that the adsorption capacity was the best at pH=2.The adsorption equilibrium can be reached in about 73 h with increasing temperature and initial Cr(Ⅵ)mass concentration.The adsorption process conformed to the pseudo-second-order kinetics and Langmuir model,and the theoretical maximum adsorption capacity of Cr(Ⅵ)was 471.970 mg·g−1.The thermodynamic analysis showed that the adsorption was a spontaneous endothermic reaction.In the simulated wastewater containing a variety of metal ions,the competitive effect had a certain influence on the adsorption performance.After three adsorption-desorption cycles,the adsorption capacity of the composite membrane decreased,but it still maintained good structural stability.The characterizations of SEM-EDS,FTIR and XPS showed that the structureof the material was porous and functional groups(—COOH,—NH2,etc.)were involved in the adsorption,and some Cr(Ⅵ)was reduced to Cr(Ⅲ),which confirmed that the adsorption of Cr(Ⅵ)by the composite membrane was the result of electrostatic binding and the synergistic effect of chemical coordination and redox.