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Indexed by:期刊论文

Date of Publication:2009-01-20

Journal:JOURNAL OF MEMBRANE SCIENCE

Included Journals:SCIE、EI

Volume:326

Issue:2

Page Number:429-434

ISSN No.:0376-7388

Key Words:Poly(phthalazinone ether amide); Interfacial polymerization; Composite nanofiltration membrane; Thermal stability; Dye desalination

Abstract:A thermal stable composite membrane was prepared by interfacial polymerization of piperazine (PIP) and trimesoyl chloride (TMC) on poly(phthalazinone ether amide) (PPEA) ultrafiltration membrane. The effect of reaction parameters on the performance of composite membranes was studied and optimized. The surface morphologies of the composite membrane and the substrate were observed by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The rejection of optimized composite membrane for dyes Congo red (CGR) and Acid chrome blue K (ACBK), the molecular weight (MW) of which is over 400, was over 99.2%, with a flux at about 180 L m(-2) h(-1). While the rejection for NaCl was only 18.2% with a flux over 270 L m-2 h-1, when tested at 1.0 MPa 60 degrees C. The composite membrane was applied in the desalination-purification experiment of dye ACBK and NaCl mixed solution. The flux of the membrane increased obviously as the operation pressure and/or temperature increased, while the rejection for dye was constant and kept over 99.3%. The purification experiments were accomplished effectively at 1.0 MPa, 80 degrees C. Only after five rounds of desalination-concentration experiment, about 160 min, the salt mixed in dye solution was fully removed. The initial flux of the eighth cycle was about 254 Lm(-2) h-1, which was only 20 L M(-2) h(-1) lower than that of the first round. The rejection of the membrane was constant and kept over 99.3% through out the eight cycles of purification experiment. (c) 2008 Elsevier B.V. All rights reserved.