POSS-Functionalized Graphene Oxide/PVDF Electrospun Membranes for Complete Arsenic Removal Using Membrane Distillation.
POSS-Functionalized Graphene Oxide/PVDF Electrospun Membranes for Complete Arsenic Removal Using Membrane Distillation.
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DOI：
10.1021/acsapm.0c01402
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发表时间：
2021-04-09
影响因子：
5
通讯作者：
Gorgojo P
中科院分区：
文献类型：
--
作者：
Leaper S;Avendaño Cáceres EO;Luque-Alled JM;Cartmell SH;Gorgojo P
这项工作证明了非常高的去除率（低于0.045 ppb的检测限）的无机砷从水中使用电纺聚偏二氟乙烯（PVDF）膜，通过在膜蒸馏中添加官能化的氧化石墨烯增强。这显示了在世界许多受砷污染地下水影响的地区应用的潜力。这些膜通过将用超疏水多面体低聚倍半硅氧烷分子（POSS-rGO）官能化的还原氧化石墨烯添加到纺丝溶液中来增强。性能最好的rGO增强膜（含有2重量% POSS-rGO）的通量比纯PVDF膜的通量高21.5%，并且在测试24小时后几乎是商业聚四氟乙烯（PTFE）膜的两倍，截留率超过99.9%。此外，该膜的通量在连续测试的5天内是稳定的（1028 L m-2 h-1），并且在处理碳酸钙和硫酸铁（III）七水合物的浓缩污垢溶液时比PTFE和对照膜的通量更稳定。在这些条件下，它还实现了更高的渗透物质量。性能最好的膜的杨氏模量和极限拉伸强度分别增加了38%和271%，相比于纯聚合物膜，而两者具有相似的孔隙率为1.91%。
This work demonstrates very high removal rates (below the detection limit of 0.045 ppb) of inorganic arsenic from water using electrospun polyvinylidene difluoride (PVDF) membranes enhanced by the addition of functionalized graphene oxide in membrane distillation. This shows potential for applications in the many parts of the world suffering from arsenic-contaminated groundwater. These membranes were enhanced by the addition of reduced graphene oxide functionalized with superhydrophobic polyhedral oligomeric silsesquioxane molecules (POSS-rGO) into the spinning solutions. The flux of the best-performing rGO-enhanced membrane (containing 2 wt % POSS-rGO) was 21.5% higher than that of the pure PVDF membrane and almost double that of a commercial polytetrafluoroethylene (PTFE) membrane after 24 h of testing, with rejection values exceeding 99.9%. Furthermore, the flux of this membrane was stable over 5 days (∼28 L m–2 h–1) of continuous testing and was more stable than those of the PTFE and control membranes when treating a concentrated fouling solution of calcium carbonate and iron(III) sulfate heptahydrate. It also achieved higher permeate quality in these conditions. The Young’s modulus and ultimate tensile strength of the best-performing membrane increased by 38 and 271%, respectively, compared to the pure polymer membrane, while both had similar porosities of ∼91%.
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