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Preparation and property of thin film composite polyamide (TFC-PA) forward osmotic (FO) membranes from polyethylene substrates modified with in situ grown ZIF-8 nano-particles

Authors： MA Junmei, XUE Xuping, LIN Mingjie, LI Shiyang，WANG Qingyi，XUE Lixin

Units： 1 Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China; 2 College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China

KeyWords： Polyethylene; ZIF-8; in situ grown; polyamide; forward osmotic membrane.

ClassificationCode：TQ051.893

year,volume(issue):pagination： 2023,43(3):64-73

Abstract：

Polyamide (PA) based thin film composite forward osmosis (TFC-FO) membranes were prepared from two-time interfacial polymerization (IP) processes between m-phenylene diamine (MPD) and trimesoyl chloride (TMC) on porous polyethylene (PE) substrates pre-modified with intermediate layers containing in situ grown ZIF-8 nano particles from the reaction of Zn(II) cations with 2-methylimidizole (2MIM) ligands. The impact of the ZIF-8 intermediate layers on the surface morphology, roughness, hydrophilicity and FO performance of the formed TFC-FO membranes were investigated. The effects from co-solvent modulation and from alcohol activation on the formed TFC-FO membranes were further studied. It was found that ZIF-8 modification could increase the surface roughness and hydrophilicity of the PE porous substrates, leading to the formation of PA layers with improved water flux and salt rejection rates. Under optimized conditions, the water flux of formed PE/ZIF-8 /PA2 TFC-FO membranes reached 28.11 L/(m²·h) with a low reverse salt flux value of 0.39 mol/(m²·h)) using 1 mol/L NaCl as drawing solution and pure water as feeding solution.

Funds：

国家自然科学基金项目（NSFC-21975222，NSFC-U1809213）。

AuthorIntro：

马俊梅（1998—），女，硕士研究生，山东日照人，研究方向为膜科学与技术。E-mail： SBXFSN@163.com

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