膜科学与技术

高盐染色废水脱盐用中空纤维超滤膜的制备和应用

作者：杨瑞元，陈金媛，李翠霞，吕伯昇，魏秀珍

单位：浙江工业大学环境学院、杭州市 310014

关键词：聚砜，磺化聚醚砜，共混改性，高盐染色废水

出版年,卷(期):页码： 2021,41(2):96-103

摘要：

在聚砜（PSf）铸膜液中加入磺化聚醚砜（SPES），引入亲水性磺酸基团（-SO3H），采用非溶剂致相分离法（NIPS）制备PSf/SPES共混改性超滤膜。通过扫描电镜（SEM）表征膜的形貌结构，过滤实验研究超滤膜的分离性能。结果表明，改性膜最佳制备条件为SPES添加量0.25 wt %，芯液组成（DMAc：H2O）为2：8，此时制备的共混改性膜在0.1 MPa压力下，纯水水通量为282.5 L/(m2·h)，对100 mg/L的活性艳橙KE-2R、活性深蓝KE-R、直接混纺黄D-3RNL的截留率分别为95.6 %、94.7 %、97.4 %；在100 g/L高浓度Na2SO4存在时，PSf/SPES共混改性膜对活性艳红X-7B的截留率仍超60 %，并可使绝大部分Na2SO4分子渗透通过，实现了对高盐染色废水中染料分子与盐分质回收的目的；此外，共混改性膜持续运行48 h处理染色废水时渗透通量和截留率变化较小，具有较好的运行稳定性，可应用于实际染色废水处理。

Hydrophilic sulfonic acid group (-SO3H) was introduced into polysulfone (PSf) bulk solution by adding sulfonated polyethersulfone (SPES) into PSf casting solution, and blend modified PSf/SPES ultrafiltration (UF) membrane were prepared by non-solvent induced phase separation (NIPS) method. The morphology and structure of the membrane were characterized by scanning electron microscope (SEM), and the separation performance of UF membrane was studied by filtration experiments. The optimal addition amount of SPES is 0.25 wt%, and the core fluid composition (DMAc: H2O) is 2:8. At this time,the pure water flux is 282.5 L/(m2·h), and the rejection rates of the modified membrane for 100 mg/L reactive brilliant orange KE-2R, reactive dark blue KE-R and direct blended yellow D-3RNL are 95.6%, 94.7%, and 97.4%, respectively under 0.1 MPa. PSf/SPES modified membrane can reject over 60% Reactive Brilliant Red X-7B and penetrate most of Na2SO4 even if the concentration of Na2SO4 was as high as 100 g/L. Thus, the dye molecules and salt molecules in the high-salt dyeing wastewater can be separated and purified. In addition, the permeation flux and rejection rate of the modified membrane changed a little during the modified membrane was used to treat dyeing wastewater for 48 hours continuously indicating the modified membrane has good operational stability and can be applied to actual dyeing wastewater treatment.

杨瑞元（1996-），男，浙江金华人，硕士生，从事聚砜膜的制备、改性和应用研究，E-mail：1822723985@qq.com.

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