Preparation and characterization of polyimide membranes in iron wastewater removal by membrane distillation

International Conference on Process Engineering and Advanced Materials 2018

Lee, S.S.^1 ; Chong, K.C.^1 ; Lai, S.O.^1 ; Koo, C.H.^1 ; Lau, W.J.^2 ; Ngu, T.W.^1 ; De, C.H.^1

Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Jalan Sungai Long, Bandar Sungai Long, 43300 Kajang, Malaysia^1

Advanced Membrane Technology Research Centre (AMTEC), Universiti Teknologi Malaysia, Skudai, Johor

81310, Malaysia^2

关键词: Coating concentration;    Direct contact membrane distillation;    Energy dispersive x-ray;    Feed inlet temperature;    Hollow fiber membranes;    Membrane distillation;    N-methyl-2-pyrrolidone;    Phase-inversion method;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/458/1/012028/pdf
DOI  :  10.1088/1757-899X/458/1/012028

来源: IOP

【 摘 要 】

Polyimide (PI) polymer is a polymeric material with superior thermal, chemical and mechanical properties allowing it to be possesses the advantages of commercially viable materials to be applied in membrane distillation (MD) process. The PI hollow fiber membranes were fabricated by phase inversion method using N-Methyl-2-pyrrolidone (NMP) as solvent. The effect of feed inlet temperature and polydimethysiloxane (PDMS) coating concentration on the permeate flux performance were studied. The characteristics test conducted suggest that the membrane possesses dense morphology with tear-drop structure. The results from energy dispersive X-ray (EDX) depicted PDMS solution was successfully coated on the membrane surface. In addition, direct contact membrane distillation experiment in the iron (III) oxide rejection shows that the feed inlet temperature had a positive effect on the permeate flux performance attributed to the higher transmembrane vapor pressure while the rejection rate was found to be consistent at 95.10 ± 0.15%. Besides, the rejection rate of iron (III) oxide for PI hollow fiber membrane coated with PDMS increases from 95.13 to 97.58% with the increase of PDMS coating concentration. This is due to the enhanced surface layer nonetheless further optimization on the concentration is required to improve the permeate flux performance.