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多巴胺接枝的GO-Al2O3膜对Na+/Mg2+的分离性能

作者：王晨颖，汪菊，漆虹

单位：（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，南京 210009）

关键词：氧化石墨烯；Al2O3管式膜；多巴胺；截留性能

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2018,38(5):55-61

摘要：

以Al2O3管式膜作为载体，采用简单的浸浆法制备GO-Al2O3膜，考察了用多巴胺接枝和未用多巴胺接枝的GO-Al2O3膜对纯水渗透性能和一二价离子截留性能的影响。结果表明，GO成功地涂覆在Al2O3管式膜表面。用多巴胺接枝的GO-Al2O3膜的纯水通量为33 L/(m2·h·bar)，比未用多巴胺接枝的GO-Al2O3膜下降了45%，相比较Al2O3膜降低了83%。在压力为3 bar，盐溶液浓度10 mM，膜面流速为1.3 m/s的条件下，Al2O3管式膜对四种无机盐溶液均无截留性能。多巴胺接枝GO-Al2O3膜和GO-Al2O3膜对四种盐溶液的截留顺序为：R(Na2SO4)＞R(NaCl)＞R(MgSO4)＞R(MgCl2)，并且多巴胺接枝GO-Al2O3膜对四种盐溶液的截留率，相对于GO-Al2O3膜，有了明显的提高。

GO-Al2O3 membrane was fabricated on Al2O3 tubular support via dip-coating method. The effects of dopamine-grafted GO-Al2O3 membrane and GO-Al2O3 membrane on the permeation of pure water and rejection of monovalent and divalent ion were investigated. The results show that GO were successfully coated on the inner surface of Al2O3 tubular support. The pure water flux of dopamine-grafted GO-Al2O3 membrane was 33 L/(m2·h·bar), which was decreased by 45% and 83% from GO-Al2O3 membrane and Al2O3 tubular support, respectively. At the pressure of 3 bar, solution concentration of 10 Mm and membrane surface velocity of 1.3 m/s, Al2O3 tubular support had no rejection of four inorganic salt solutions. Dopamine-grafted GO-Al2O3 and GO-Al2O3 membrane exhibited a decreasing rejection rate in the sequence as follow: R(Na2SO4)＞R(NaCl)＞R(MgSO4)＞R(MgCl2). Compared to GO-Al2O3 membrane, the rejection of four inorganic salt solutions with dopamine-grafted GO-Al2O3 membrane had significant increase.

基金项目：

国家自然基金项目（21490581），中国石油化工股份有限公司资助项目（317008-6），广西创新驱动发展专项资金项目（桂科AA17204092）

作者简介：

第一作者简介：王晨颖（1993-），女，江苏南京人，硕士研究生，主要从事氧化石墨烯陶瓷复合膜的制备及表征研究，E-mail: cyingwang@sina.com 通讯作者，E-mail: hqi@njtech.edu.cn

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