PVDF membranes containing reduced graphene oxide: Effect of degree of reduction on membrane distillation performance
PVDF membranes containing reduced graphene oxide: Effect of degree of reduction on membrane distillation performance
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DOI：
10.1016/j.desal.2018.11.014
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发表时间：
2019-02-15
期刊：
影响因子：
9.9
通讯作者：
Gorgojo, Patricia
中科院分区：
文献类型：
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作者：
Abdel-Karim, Ahmed;Luque-Alled, Jose Miguel;Gorgojo, Patricia
疏水性聚偏氟乙烯(PVDF)膜已成功地用于膜蒸馏(MD)的海水淡化，但在水通量和盐截留率方面仍有改进的空间。本工作将不同还原程度的氧化石墨烯(RGO)纳米片(XPS表征为氧的脱除程度分别为36%、58%、65%和69%)作为填料加入到PVDF中，以评价填料的氧含量对机械弥散性能的影响。用紫外-可见光谱和拉曼光谱对所制备的rGO进行了表征。用扫描电子显微镜(SEM)分析了所制备的混合基质膜(MMM)的形态变化，这与填料的加入增加了铸膜液的亲水性和粘度有关。含有0.5wt%rGO的MMMS的最佳还原程度为58%，表现出较好的MD性能，通量接近7.0PVDFm(-2)h(-1)(LMH)，与普通PVDF膜相比提高了169%，而不影响盐截留率(>；99.99%)。长达96小时的连续测试表明，所开发的MMM性能稳定，不会影响渗透液的质量。
Hydrophobic polyvinylidene fluoride (PVDF) membranes have been successfully used in membrane distillatio (MD) for desalination applications; however, there is still room for performance enhancements both regarding water flux and salt rejection. In this work, reduced graphene oxide (rGO) nanoplatelets with different degrees of reduction (36%, 58%, 65 and 69% removal of oxygen, as characterized by XPS) were incorporated as fillers in PVDF matrices in order to evaluate the effect of the oxygen content of the fillers in the MD performance. UV-Vis and Raman spectroscopies were also used to characterize the fabricated rGO. Changes in morphology of the prepared mixed matrix membranes (MMMs) were assessed via scanning electron microscopy (SEM) and were related to the increased hydrophilicity and viscosity of the casting solutions when fillers were added. MMMs containing 0.5 wt% rGO with an optimum degree of reduction of 58% exhibited an improved MD performance with fluxes of similar to 7.0 L m(-2)h(-1) (LMH), representing an enhancement of similar to 169% in comparison with the plain PVDF membrane, without compromising salt rejection ( > 99.99%). Continuous testing for up to 96 h showed stable performance of the developed MMMs, without compromising the quality of the permeate.