氧化石墨烯/聚哌嗪酰胺复合纳滤膜在染料脱除中的应用研究
作者:王 进1,赵长伟2,吴 珍3,王 涛1,李 祥1,李继定1
单位: 1.清华大学化学工程系化学工程国家重点联合实验室,北京100084; 2.中国科学院生态环境研究中心环境水质学国家重点实验室,100085; 3. 鄂尔多斯市紫荆创新研究院,鄂尔多斯 017000
关键词: 氧化石墨烯;聚酰胺;纳滤膜;界面聚合;染料
分类号: TQ028.8
出版年,卷(期):页码: 2016,36(6):86-94

摘要:
 采用界面聚合的方法制备了抗污染的氧化石墨烯(GO)改性聚酰胺(PA)复合纳滤膜(GO-PA),并对其在脱除染料中的应用进行研究。以哌嗪(PIP)、氧化石墨烯(GO)混合分散液作为水相,均苯三甲酰氯(TMC)的正己烷溶液作为有机相,在聚醚砜(PES)超滤膜支撑层上采用界面聚合的方法制备复合纳滤膜(GO-PA)。通过表征,膜表面呈荷负电性,平均孔径0.4 nm左右,截留分子量774 Da左右。在0.6 MPa的操作压力下,膜的纯水通量可达87.6 L/(m2 •h),对无机盐的截留率为:Na2SO4 (98.2%) > MgSO4(96.5%)> NaCl (56.8%) > MgCl2 (50.5%)。复合膜的抗污染性实验结果表明,GO-PA膜的抗污染性能明显提高。最后,通过考察复合膜对酸性红、直接黑、直接黄三种染料的去除效果,结果表明,所制备的GO-PA复合膜对三种染料的截留率达到98% 以上。
 The anti-fouling graphene oxide modified polyamide composite nanofiltration membranes (GO-PA) were prepared through trimesoyl chloride (TMC) reacting with the GO dispersion in piperazine (PIP) aqueous solution via interfacial polymerization (IP) on the polyether sulfone (PES) UF substrates, and the prepared composite nanofiltration membrane was applied in removal of dye wastewater. The characterization results indicated that the negative charged membrane was successfully fabricated, and the mean effective pore size and the molecular weight cut-off (MWCO) were about 0.4 nm and 774 Da respectively. The pure water flux was 87.6 (L•m-2•h-1) under the operating pressure of 0.6 MPa, and the salt rejections of the membrane decrease in the order Na2SO4 (98.2%) > MgSO4 (96.5%)> NaCl (56.8%) > MgCl2 (50.5%). Fouling resistances of the membranes results revealed that the GO-PA membrane had improved the antifouling properties. The removal of the Silk Scarlet (GR GR), Direct Black 22 (DB), Sun Yellow (SY) was investigated in this study, the result suggested that the GO-PA membrane could effective remove the dyes and its rejection were above 98%.

基金项目:
基金项目:江苏先进生物与化学制造协同创新中心项目,国家自然科学基金项目(21576150);清华大学科学基金项目(20131089399);国家科技部科研院所技术开发研究专项资金(2013EG111129)。

作者简介:
作者简介:王进(1991-),男,北京,硕士研究生,从事纳滤膜材料以及过程等方向研究;电子邮箱:wangjinhnu@163.com。 ?联系作者:李继定(1954-),男,清华大学教授,从事膜分离与分离膜等方向研究,E-mail:lijiding@mail.tsinghua.edu.cn。

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