Preparation and characterization of low fouling novel hybrid ultrafiltration membranes based on the blends of GO - TiO2 nanocomposite and polysulfone for humic acid removal
Preparation and characterization of low fouling novel hybrid ultrafiltration membranes based on the blends of GO - TiO2 nanocomposite and polysulfone for humic acid removal
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DOI：
10.1016/j.memsci.2016.02.005
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发表时间：
2016-05-15
影响因子：
9.5
通讯作者：
Lawler, Jenny
中科院分区：
文献类型：
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作者：
Kumar, Mahendra;Gholamvand, Zahra;Lawler, Jenny
本工作以氧化石墨烯(GO)纳米片状悬浮液为原料，以异丙醇钛为前驱体，在pH=2的条件下，采用原位溶胶凝胶法制备了GO-二氧化钛纳米复合材料。利用合成的二氧化钛纳米复合材料作为填料，制备了新型杂化超滤膜，用于去除水溶液中的腐植酸。以不同负载量(0~5wt%)的聚砜和二氧化钛聚合物共混液为原料，采用非溶剂诱导相分离(NIPS)法制备膜。通过接触角、原子力显微镜、扫描电子显微镜、傅立叶变换红外光谱和外表面Zeta电位等测试手段对膜的表面粗糙度、结构、表面性质和电荷进行了表征。结果表明，多孔亲水杂化膜具有不对称结构，表面粗糙度得到改善。含10ppm HA溶液的杂化膜的透水率和抗污染能力与GO-TiO2的负载量有关。研究发现，在HA溶液中加入GO-TiO2纳米复合材料可以改善膜的抗污染性能。随着二氧化钛纳米复合材料负载量的增加(wt%)，不可逆羟基磷灰石的结垢大大减少。当纳米复合材料的质量分数为5wt%(占PSF、MG5总质量分数的百分比)时，膜的不可逆污染率最低(3.2%)。在pH=7、进料压力为1bar的条件下，用杂化膜对不同浓度的HA溶液进行了超滤研究。杂化膜对HA的去除效率受膜表面电荷浓度、孔隙率和HA排除率的影响。在pH=7.时，膜MG 5对10ppm HA溶液的去除效率最高。(C)2016 Elsevier B.V.保留所有权利。
In this work, graphene oxide (GO) TiO2 nanocomposite was synthesized by in situ sol gel reaction at pH = 2 using GO nanosheets suspension and titanium isopropoxide precursor. The synthesized GO TiO2 nanocomposite was explored as a filler to fabricate improved antifouling novel hybrid ultrafiltration membranes for removal of humic acid from aqueous solution. Membranes were fabricated from polymer blend solutions containing polysulfone and GO TiO2 with varied loading amount (0-5 wt%) by the non solvent induced phase separation (NIPS) method. Contact angle, atomic force microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy and outer surface zeta potential studies were conducted in order to characterise the membranes in terms of roughness, structure, surface properties and charge. The porous hydrophilic hybrid membranes were shown to have an asymmetric structure with improved surface roughness. The water permeability and antifouling capacity of hybrid membranes with 10 ppm HA solution were dependent on the loading amount of GO-TiO2. Incorporation of GO-TiO2 nanocomposite was found to improve the antifouling characteristics of the membranes when challenged with HA solutions. Irreversible HA fouling was substantially reduced with increased loading of GO TiO2 nanocomposite (wt%). The lowest irreversible fouling ratio (3.2%) was obtained for the membrane containing 5 wt% nanocomposite (to total wt% of PSf, MG 5). Ultrafiltration of HA solutions of varied concentrations using hybrid membranes was studied at pH= 7 and 1 bar feed pressure. The removal efficiency of hybrid membranes for HA was controlled by the membrane surface charge concentration, porosity and HA exclusion. The membrane MG 5 had the highest HA removal efficiency for 10 ppm HA solution at pH = 7. (C) 2016 Elsevier B.V. All rights reserved.