Organosilane-functionalized graphene oxide for enhanced antifouling and mechanical properties of polyvinylidene fluoride ultrafiltration membranes
Organosilane-functionalized graphene oxide for enhanced antifouling and mechanical properties of polyvinylidene fluoride ultrafiltration membranes
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有机硅烷功能化氧化石墨烯增强聚偏二氟乙烯超滤膜的防污和机械性能
DOI：
10.1016/j.memsci.2014.01.050
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发表时间：
2014-05
影响因子：
9.5
通讯作者：
Xiaoming Qian
中科院分区：
文献类型：
--
作者：
Baodong Li;Jiarong Niu;Baoming Zhou;Xiaoming Qian
通过3-氨丙基三乙氧基硅烷（APTS）的简单共价官能化反应合成了功能化氧化石墨烯（f-GO）。通过浸渍沉淀法制备了不同比例的氧化石墨烯（GO）和f-GO杂化聚偏氟乙烯（PVDF）超滤膜。Zeta电位分析表明，APTS共价修饰GO有利于GO在有机溶剂中的均匀分散。SEM照片显示，添加剂的加入使表层出现了很大的孔道。此外，PVDF/f-GO膜表现出上级的亲水性，水通量，BSA通量和截留率比初生PVDF膜和PVDF/GO膜。过滤结果表明，由于杂化膜的亲水性增强，膜的污染阻力参数显著下降。原子力显微镜（AFM）分析表明，膜与污垢之间的粘附力按以下顺序增加：PVDF/f-GO<PVDF/GO<PVDF。在BSA溶液内污染过程中，PVDF/f-GO膜的水通量恢复率（FRR）高于PVDF/GO膜。与此同时，PVDF/f-GO膜的拉伸强度和断裂伸长率分别比PVDF/GO膜提高了69.01%和48.38%，这可能是由于GO的共价功能化使f-GO与基体之间产生了较强的界面相互作用。因此，GO功能化将提供一种有前途的方法来制备具有有效增强的渗透、渗透和机械性能的石墨烯基杂化膜。
Functionalized graphene oxide (f-GO) was synthesized by a simple covalent functionalization with 3-aminopropyltriethoxysilane (APTS). The hybrid polyvinylidene fluoride (PVDF) ultrafiltration membranes were then prepared by adding different ratios of graphene oxide (GO) and f-GO via phase inversion induced by immersion precipitation technique. Zeta potential demonstrated that covalent functionalization of GO with APTS was favorable for their homogeneous dispersion in organic solvents. SEM images showed that very large channel appeared in top-layer by the addition of additives. Furthermore, the PVDF/f-GO membranes exhibited superior hydrophilicity, water flux, BSA flux and rejection rate than nascent PVDF membranes and PVDF/GO membranes. Filtration results indicated that the fouling resistance parameters were significantly declined due to higher hydrophilicity of hybrid membranes. An atomic force microscope (AFM) analysis with a BSA-immobilized tip revealed that the adhesion forces between membrane and foulants increased in the following order: PVDF/f-GO<PVDF/GO<PVDF. After a ternary cycle BSA solution inner fouling process, PVDF/f-GO membranes exhibited higher water flux recovery ratio (FRR) value than that of PVDF/GO. Meanwhile, tensile strength and elongation-at-break of PVDF/f-GO membranes were increased by 69.01% and 48.38% compared with those of PVDF/GO membranes, which is believed to be attributed to the strong interfacial interaction between f-GO and matrix by covalent functionalization of GO. As a result, GO functionalization will provide a promising method to fabricate graphene-based hybrid membranes with effective reinforced permeation, antifouling and mechanical performance.
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DOI：
10.1016/j.memsci.2013.02.009
发表时间：
2013-06
期刊：
J. Membr. Sci.
影响因子：
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作者：
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作者：
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影响因子：
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作者：
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影响因子：
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作者：
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影响因子：
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