膜科学与技术

改性水滑石复合纳滤膜的制备及染料/盐分离性能研究

作者：田陈，朱利苹，冯孝权，单美霞，张亚涛

单位： 1郑州大学化工学院，河南郑州450001； 2郑州市先进分离技术重点实验室，河南郑州450001

关键词：改性水滑石；复合纳滤膜；染料截留；脱盐

出版年,卷(期):页码： 2021,41(2):33-40

摘要：

纳滤膜在水处理领域应用广泛，但传统纳滤膜无法分离多价盐染料溶液。因此在传统纳滤膜的基础上，开发可分离多价离子与染料的新型复合纳滤膜，已成膜分离领域研究的热点之一。本文通过低饱和共沉淀法制备水滑石（LDH），采用反向原子转移自由基聚合（RATRP）法在水滑石片层表面接枝聚对苯乙烯磺酸钠（PSS），制备改性水滑石（LDH-PSS），最后采用层层自组装法制备LDH/LDH-PSS复合纳滤膜，并研究复合纳滤膜对染料与二价盐的分离效果以及不同添加量和LDH/LDH-PSS层数对其性能的影响。分析复合纳滤膜对一价盐、二价盐以及活性黑的截留性能和膜的纯水渗透率，研究复合纳滤膜的分离性能。结果表明：复合纳滤膜的纯水渗透率随着水滑石和改性水滑石层数的增加而降低，复合纳滤膜的纯水渗透率最高达到14.5 L/(m2?h?bar)。复合纳滤膜对活性黑5的截留率可达到96.7%，且对二价无机盐硫酸镁的截留率低至20%以下。

The hydrotalcite (LDH) was prepared by low saturated coprecipitation. Sodium p-styrene sulfonate (PSS) was then grafted onto the surface of hydrotalcite lamella by reverse atomic transfer radical polymerization (RATRP) to prepare LDH-PSS. Finally, LDH/LDH-PSS composite membranes were prepared by self-assembly method. The separation performance of dye and divalent salt of the prepared composite membrane was studied and the effect of the addition amount and layers of LDH/LDH-PSS on the membrane separation performance was further investigated. The rejection of monovalent salt, divalent salt and reactive black 5 and the pure water permeability of the composite membrane were analyzed to study the separation performance of the composite membrane. The results show that the pure water permeability of the composite membrane decreases as the number of hydrotalcite and modified hydrotalcite layers increases, the pure water flux of the membrane is 14.5 L/(m2·h·bar), the rejection rate of the membrane to reactive dye reaches over 96.7%, and the rejection of divalent inorganic salt magnesium sulfate is below 20%.

田陈(1994-03-14)，男，河南商丘人，硕士研究生，从事膜分离技术的研究。 E-mail：1690899743@qq.com。

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