CIESC Journal ›› 2020, Vol. 71 ›› Issue (6): 2795-2803.DOI: 10.11949/0438-1157.20200205

• Material science and engineering, nanotechnology • Previous Articles     Next Articles

Fabrication and stability of GO/Al2O3 composite nanofiltration membranes

Ju WANG1(),Shufeng NIU2,Ying FEI1,Hong QI1()   

  1. 1.Membrane Science and Technology Research Center, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, China
    2.Hongyi Ceramic Membranes Research Institute, Nanjing Hongyi Ceramic Nanofiltration Membranes Co. , Ltd. , Nanjing 210009, Jiangsu, China
  • Received:2020-02-28 Revised:2020-04-07 Online:2020-06-05 Published:2020-06-05
  • Contact: Hong QI

GO/Al2O3复合纳滤膜的制备及其稳定性能研究

汪菊1(),牛淑锋2,费莹1,漆虹1()   

  1. 1.南京工业大学膜科学技术研究所,材料化学工程国家重点实验室,江苏 南京 210009
    2.翃翌陶瓷膜研究院,南京翃翌陶瓷纳滤膜有限公司,江苏 南京 210009
  • 通讯作者: 漆虹
  • 作者简介:汪菊(1995—),女,硕士研究生,2543303804@qq.com
  • 基金资助:
    国家自然科学基金项目(21490581);中国石油化工股份有限公司资助项目(317008-6)

Abstract:

Using an tubular Al2O3 ultrafiltration membrane with an average pore diameter of 20 nm as the carrier, after modified by dopamine, a pressure-driven deposition method was used to successfully prepare a GO/Al2O3 composite nanofiltration membrane that can be stable in aqueous solution for a long time. The thickness of GO layer can be controlled by changing the loading amount. The results showed that the pure water permeability of all GO/Al2O3 composite nanofiltration membranes decreased and then reached a steady state during the cross-flow filtration. In addition, the pure water permeability of GO/Al2O3 composite nanofiltration membranes decreased as the GO loading amount increased. The permeability and rejection of GO/Al2O3 composite nanofiltration membranes remained stable when GO loading amount was greater than 90 mg/m2. As the storage time (in pure water) extended, the cross-linking of GO sheets caused by residual salt ions during tests led to a higher rejection of GO/Al2O3 composite nanofiltration membranes towards monovalent and divalent salts. After being immersed in pure water for 680 h, the GO/Al2O3 composite nanofiltration membrane with GO loading amount of 140 mg/m2 showed the highest Na2SO4 rejection of 91.0%. The rejections of GO/Al2O3 composite nanofiltration membranes towards four salt solutions were as follows: R(Na2SO4) > R(MgSO4) > R(NaCl) > R(MgCl2).

Key words: graphene oxide, tubular Al2O3 membranes, dopamine, loading amount, nanofiltration, stability

摘要:

以平均孔径为20 nm的Al2O3管式超滤膜为载体,经多巴胺改性后,利用压力驱动沉积法成功制备出能在水溶液中长期稳定的GO/Al2O3复合纳滤膜,并通过改变负载量实现了对GO层厚的调控。结果表明,随错流时间的延长,不同GO负载量下GO/Al2O3复合纳滤膜的纯水渗透系数均呈现先降低后稳定的趋势。且随着GO负载量的增加,稳态纯水渗透系数逐渐降低;当GO负载量增加到90 mg/m2后,GO/Al2O3复合纳滤膜对一二价盐的渗透系数与截留率均无显著变化。同时,由于盐测试过程中残余的盐离子在GO片层间产生了交联作用,从而导致随着在纯水中存放时间的延长,不同GO负载量的GO/Al2O3复合纳滤膜对一二价盐的截留率均呈上升趋势。GO负载量为140 mg/m2的GO/Al2O3复合纳滤膜在水中浸泡680 h后对1 mmol/L Na2SO4的截留率可达到91.0%。GO/Al2O3复合纳滤膜对四种一二价盐的截留率满足:R(Na2SO4) > R(MgSO4) > R(NaCl) > R(MgCl2)。

关键词: 氧化石墨烯, Al2O3管式膜, 多巴胺, 负载量, 纳滤, 稳定性

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