PDA夹层调控的荷正电纳滤膜的制备及在水处理中的应用

doi:10.11896/cldb.21090216

材料导报

2023, Vol. 37

Issue (6): 21090216-8 https://doi.org/10.11896/cldb.21090216

高分子与聚合物基复合材料

PDA夹层调控的荷正电纳滤膜的制备及在水处理中的应用

包亚晴¹, 黄李金鸿², 李新冬¹, 黄彪林³, 黄万抚^3,*

1 江西理工大学土木与测绘工程学院,江西赣州 341000
2 江西理工大学建筑与设计工程学院,江西赣州 341000
3 江西理工大学资源与环境工程学院,江西赣州 341000

Preparation of Positively Charged Nanofiltration Membrane Regulated by PDA Interlayer and Its Application in Water Treatment

BAO Yaqing¹, HUANG Lijinhong², LI Xindong¹, HUANG Biaolin³, HUANG Wanfu^3,*

1 School of Civil and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
2 School of Architecture and Design Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
3 School of Resource and Environmental Engineering,Jiangxi Unviersity of Science and Technology,Ganzhou 341000, Jiangxi, China

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摘要当前商用纳滤膜在溶液中多显示荷负电,而根据道南效应,荷正电纳滤膜在分离废水中的荷正电物质时更具优势。本工作在掺杂金属有机骨架(MOF)的混合基质基膜上构建聚多巴胺(PDA)中间层,再通过聚乙烯亚胺(PEI)和均苯三甲酰氯(TMC)的交联反应制备了荷正电聚酰胺复合纳滤膜。对多巴胺(DA)沉积浓度和时间及TMC有机相的添加条件进行优化;对比了PDA中间层添加前后两种复合纳滤膜对1 g/L的MgCl₂、NaCl、MgSO₄、Na₂SO₄溶液的渗透截留情况;重点考察了改性膜对含Cu²⁺、Ni²⁺和Pb²⁺的重金属溶液及五种阴阳离子染料的处理情况,最后评估了膜的耐污染性能。结果表明,将2 g/L的DA在超滤支撑层上沉积90 min,PEI水相浓度为1.2%、浸没时间为7 min、TMC有机相浓度为0.5%、交联时间为120 s时,所制备的改性膜的综合性能最佳,膜的接触角为51.5°,表面粗糙度下降,等电点在pH为9左右,在溶液中显示荷正电。改性膜对MgCl₂的截留率上升到94.26%,在0.8 MPa下,其对Cu²⁺、Ni²⁺、Pb²⁺溶液的水通量均在40 L/(m²·h)以上,且离子截留率分别为96.57%、95.23%、94.73%;同时,其对几种染料的截留率均能达到90%以上。因此,PDA中间层改性的荷正电纳滤膜在废水处理中具有良好的应用前景。

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	包亚晴
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关键词: 聚多巴胺(PDA) 聚乙烯亚胺(PEI) 荷正电纳滤膜重金属染料

Abstract: At present, most commercial nanofiltration membranes show negative charge in solution, while according to the Donnan effect, positively charged nanofiltration membranes have more advantages in separating positively charged substances in wastewater. In this work, polydopamine (PDA) interlayer was constructed on MOF doped mixed matrix base membrane, and then positively charged polyamide composite nanofiltration membrane was prepared by crosslinking reaction of polyethyleneimine (PEI) and homobenzoyl chloride (TMC). The concentration and time of dopamine (DA) deposition and the addition conditions of TMC organic phase were optimized; the permeation and interception of 1 g/L MgCl₂, NaCl, MgSO₄ and Na₂SO₄ solutions by two kinds of composite nanofiltration membranes before and after the addition of PDA interlayer were compared; the treatment of heavy metal solutions containing Cu²⁺, Ni²⁺ and Pb²⁺ and five anionic and ionic dyes by the modified membrane was investigated. Finally, the pollution resistance of the membrane was evaluated. The results showed that when 2 g/L DA was deposited on the ultrafiltration support layer for 90 min, the concentration of PEI aqueous phase was 1.2%, immersion time was 7 min, the concentration of TMC organic phase was 0.5% and crosslinking time was 120 s, the comprehensive performance of the modified membrane was the best. At this time, the hydrophilicity of the modified membrane was improved, the contact angle was 51.5°, the surface roughness of the membrane decreased, and its isoelectric point is about pH=9, showed positive charge in general solution.The retention rate of MgCl₂ by the modified membrane increased to 94.26%. At 0.8 MPa, the water flux to Cu²⁺, Ni²⁺ and Pb²⁺ solutions was more than 40 L/(m²·h), and the ion retention rates were 96.57%, 95.23% and 94.73% respectively. At the same time, the rejection rate of several dyes can reach more than 90%. Therefore, the positively charged nanofiltration membrane modified by PDA interlayer has a good application prospect in wastewater.

Key words: polydopamine (PDA) polyethyleneimine (PEI) positively charged nanofiltration membrane heavy metals dyes

发布日期: 2023-03-27

ZTFLH:

TQ028.8

基金资助: 国家自然科学基金(51864017;41662004)

通讯作者: *黄万抚,南昌大学和江西理工大学博士研究生导师,二级教授、博士(后),享受国务院政府特殊津贴专家。研究方向为膜分离、矿物加工和废水处理技术。1983年在中南矿冶学院获得工学学士学位,1988在南方冶金学院获得工学硕士学位,1999年在北京科技大学获得工学博士学位。澳大利亚科廷大学访问学者,清华大学高级访问学者。主持科研项目88项,发表论文160余篇,出版学术专著1部。Sim2008@sina.com

作者简介: 包亚晴,2019年7月毕业于安徽工程大学,获得工学学士学位,2019年9月至今在江西理工大学攻读工程硕士学位,研究方向为膜分离技术。

引用本文:

包亚晴, 黄李金鸿, 李新冬, 黄彪林, 黄万抚. PDA夹层调控的荷正电纳滤膜的制备及在水处理中的应用[J]. 材料导报, 2023, 37(6): 21090216-8.
BAO Yaqing, HUANG Lijinhong, LI Xindong, HUANG Biaolin, HUANG Wanfu. Preparation of Positively Charged Nanofiltration Membrane Regulated by PDA Interlayer and Its Application in Water Treatment. Materials Reports, 2023, 37(6): 21090216-8.

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http://www.mater-rep.com/CN/10.11896/cldb.21090216 或 http://www.mater-rep.com/CN/Y2023/V37/I6/21090216

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