Abstract
Alginate is a natural polysaccharide polymer.Hydrogel filtration membranes prepared from alginate show excellent fouling resistance and controllable separation performance,but poor mechanical properties limit the use of algae hydrogels.In this study,Ba2+/Ca2+co-crosslinked alginate(Ba/CaAlg)hydrogel mem-brane was prepared by cross-linking sodium alginate with a blend aqueous solution of barium ions and calcium ions,and the membrane was applied to the separation of dyes/salts from dyeing wastewater.Compared with the CaAlg membrane,the Ba/CaAlg hydrogel membrane exhibited more stable structure,and the mechanical properties and salt tolerance of the membrane were significantly improved.The flux of Ba/CaAlg membrane for methyl blue/sodium chloride mixed solution reached 43.5 L m-2 h-1,which was significantly higher than that of CaAlg membrane.Besides,the Ba/CaAlg membrane showed higher dye rejection(＞99.6％)and lower salt rejection(＜8.2％).The structure of Ba/CaAlg membrane was pre-liminarily simulated by molecular dynamics,and the pore size and distribution of the membrane were calculated.The Ba/CaAlg membrane has a broad application prospect in dyes/salts separation.
基金项目
国家自然科学基金(22078244)
Scientific research and development project of SINOPEC(222443)
Science and Technology Plans of Tianjin(20JCYBJC00120)
万方数据