将UiO-66-NH₂晶体加入SiO₂-ZrO₂溶胶中,通过溶胶-凝胶法在陶瓷载体上制备出UiO-66-NH₂/SiO₂-ZrO₂膜,利用UiO-66-NH₂的多孔结构和亲水基团改进SiO₂-ZrO₂膜的纳滤性能。考察了不同UiO-66-NH₂加入量对杂化膜纳滤双氯芬酸钠(DCF)水溶液的影响,并对杂化膜进行表征,以聚乙烯醇截留分子质量评价膜孔径。结果表明,在DCF的纳滤测试中,随着UiO-66-NH₂质量分数的增大,UiO-66-NH₂/SiO₂-ZrO₂膜水通量先增大后降低,但均高于未添加的SiO₂-ZrO₂膜,对DCF的截留率均保持在98.7%以上;最佳UiO-66-NH₂/SiO₂-ZrO₂掺杂为0.3时,杂化膜通量提高至4.8 L/(h·m²),通量增加了84%。随着操作压力和料液温度的提高,膜通量增大,截留率变化较小。在70℃、0.6 MPa下,杂化膜通量达到14.25 L/(h·m²),对DCF水溶液的截留率为98.1%。

UiO-66-NH₂/SiO₂-ZrO₂ hybrid membranes are prepared on ceramic support via a sol gel method by adding UiO-66-NH₂ crystal into SiO₂-ZrO₂ sol.The nanofiltration performance of SiO₂-ZrO₂ membranes are improved by utilizing porous structure and hydrophilicity of UiO-66-NH₂.The influences of UiO-66-NH₂ dosage on nanofiltration of the hybrid membrane for diclofenac sodium (DCF) aqueous solution are investigated,and the membranes are characterized.The pore size of the membranes is evaluated with molecular weight cut-off of polyvinyl alcohol.It is found from DCF nanofiltration test that the water flux of the hybrid membrane increases firstly and decreases then as the content of UiO-66-NH₂ increases in the membranes.But the water flux of the hybrid membrane always remains higher than that of SiO₂-ZrO₂ membrane.The retention rates of DCF by the hybrid membrane are always above 98.7%.UiO-66-NH₂/SiO₂-ZrO₂ membrane with the optimal UiO-66-NH₂ doping ratio of 0.3 shows a flux of 4.8 L/(h·m²),increasing by 84%.With increasing operation pressure and liquid temperature,membrane flux increases and the retention rate decreases.Under 70℃ and 0.6 MPa conditions,the hybrid membrane shows a flux of 14.25 L/(h·m²) and a retention rate of 98.1% to aqueous solution.

刘若妍(2002-),女,本科生,研究方向为膜分离,20442307@smail.cczu.edu.cn