ZSM-5 Zeolite Nanosheet-Based Membranes on Porous Polyvinylidene Fluoride for High-Flux Desalination
ZSM-5 Zeolite Nanosheet-Based Membranes on Porous Polyvinylidene Fluoride for High-Flux Desalination
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DOI：
10.1021/acsanm.1c00046
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发表时间：
2021-03-05
影响因子：
5.9
通讯作者：
Dong, Junhang
中科院分区：
文献类型：
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作者：
Cao, Zishu;Iskhakova, Landysh;Dong, Junhang
采用简单的真空过滤-涂布法在大孔聚偏氟乙烯（PVDF）基底上制备了亚微米厚的分子筛/沸石纳米片叠层（ZNL）膜。该膜具有优异的水通量（类似于11 kg/m（2）.h）和脱盐率（类似于99.9%）在具有22wt%的总溶解盐（TDS）（包括Li+、Na+、K+、Mg 2+、Cl-和SO 42-）的多组分盐水的渗透蒸发（PV）脱盐中，高盐度盐水的脱盐对于许多工业生产的沃茨的处理和有益使用是关键的。大的纵横比（>100）和优选的b-取向的密集分层的纳米片使溶液脱水速率超过在纳米级纳米片间空间的离子扩散速率。这种独特的传输行为有效地防止了溶解的盐通过ZNL层迁移，并稳定了水通量和离子截留率。支撑的多层ZNL膜，这是互锁的基板型PVDF粘合剂，在高TDS盐水的PV脱盐表现出结构和性能稳定性。
A submicrometer-thick molecular sieve zeolite nanosheet laminated (ZNL) membrane has been synthesized on macroporous polyvinylidene fluoride (PVDF) substrate via the simplistic vacuum filtration-coating method. The membrane has been demonstrated with extraordinary water flux (similar to 11 kg/m(2).h) and salt rejection (similar to 99.9%) in pervaporation (PV) desalination of a multicomponent brine with 22 wt % of total dissolved salts (TDS) including Li+, Na+, K+, Mg2+, Cl-, and SO42-, etc. The desalination of high-salinity brines is critical to treatment and beneficial use of many industrial produced waters. The large aspect ratios (>100) and preferable b-orientation of the densely layered nanosheets make the solution dewatering rate surpass the ion diffusion rates in the nanoscale internanosheet spaces. This unique transport behavior effectively prevents the dissolved salts from migrating through the ZNL layer and stabilizes the water flux and ion rejection rates. The supported multilayered ZNL membrane, which is interlocked by the substrate-type PVDF binder, exhibits structure and performance stability in PV desalination of high-TDS brines.