摘要
采用溶剂绿7(SG)对氧化石墨烯(GO)片层进行修饰制备得到SG@GO复合材料,以层层自组装法制备SG@GO/聚二甲基二烯丙基氯化铵(PDDA)复合膜并考察该复合膜的有机溶剂纳滤性能.通过透射电镜、原子力显微镜、红外光谱(FTIR)等表征验证了SG对GO的成功改性,改性后GO片层厚度明显增加,同时FTIR谱图中出现磺酸根的特征峰.随着组装的进行,Zeta电位结果显示膜表面电荷呈规律性交替变化,X射线衍射谱图中GO的特征峰增强,扫描电镜图中膜层的厚度增加,证明了SG@GO与PDDA的成功组装.同时考察了组装层数、SG浓度、染料种类等条件对复合膜分离性能的影响.结果表明,当SG浓度为1.5g/L,组装层数为3.5层时,制备的(SG@GO/PDDA)3.5复合膜对甲基蓝/甲醇显示出良好的分离性能,其通量及截留率分别可达到50L/(m^2·h·MPa)及95.2%.此外,该复合膜在400min连续性能测试过程中,表现出良好的稳定性.
Solvent Green(SG)has been utilized to modify graphene oxide(GO)nanosheets and then Solvent Green@graphene oxide/poly(dimethyldiallylammonium chloride)(SG@GO/PDDA)multilayer membranes were fabricated from the as-prepared SG@GO composite via layer-by-layer self-assembly.The preparation of SG@GO was confirmed by TEM,AFM,FTIR and XPS.The results showed that the thickness of GO nanosheets increased from 2.2 nm to 2.7 nm due to the deposition of SG molecules.The regular alternation of Zeta potential on the surface indicated the successful assembly of SG@GO and PDDA.This was confirmed by the increase in intensity of the characteristic GO peak in the XRD patterns.The performance of SG@GO/PDDA membranes in organic solvent nanofiltration was studied.The optimized flux and dye retention for methyl blue/methanol solution reached50 L/(m^2·h·MPa)and 95.2%,respectively,when the concentration of SG was 1.5 g/L and the number of assembled layers was 3.5.Furthermore,400 min continuous nanofiltration tests demonstrated that the SG@GO/PDDA membrane had high stability.
作者
汪林
申洪泮
王乃鑫
纪树兰
WANG Lin;SHEN Hongpan;WANG Naixin;JI Shulan(Beijing Key Laboratory for Green Catalysis and Separation,College of Environmental and Energy Engineering,Beijing University of Technology,Beijing,100124,China)
出处
《膜科学与技术》
CAS
CSCD
北大核心
2018年第6期48-55,62,共9页
Membrane Science and Technology
基金
国家自然科学基金资助项目(21576003)
关键词
氧化石墨烯
层层自组装
有机溶剂纳滤
溶剂绿
染料脱除
graphene oxide
layer-by-layer self-assembly
organic solvent nanofiltration
Solvent Green
dye removal
