Preparation and Rejection Properties of Free-standing Anti-fouling Calcium Alginate Hydrogel Filtration Membranes
Author(s): An-hou Xu, Xin-xin Zhang, Kong-yin Zhao, Jia-jie Li, Wen-kui Cui, School of Chemistry and Chemical Engineering, University of Jinan, Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, State Key Laboratory of separation membranes and membrane processes, Tianjin Polytechnic University
Pages: 913-920
Year: 2015 Issue: 8
Journal: Acta Polymerica Sinica
Keyword: Calcium alginate; Hydrogel filtration membrane; Mechanical properties; Anti-fouling; Nanofiltration;
Abstract: A free-standing calcium alginate( CA) hydrogel filtration membrane was prepared using polyethylene glycol( PEG) as the pore-forming agent. The surface morphology of the filtration membrane was studied through SEM and digital photos. The relationships between flux and compression ratio,mechanical behavior of the filtration membranes were studied. The effects of the concentrations of sodium alginate( SA)and polyethylene glycol on the pure water flux( PWF) and filtration properties of lysozyme( Lyz) solutions were investigated. Results showed that CA filtration membrane prepared using a low SA concentration and a high PEG concentration had a high flux and compression rate. The PWF increased with increase in the pressure initially,and then reached a stable value. The fluxes of Lyz and bovine serum albumin( BSA) solutions were89. 97% and 94. 6% of the PWF,respectively,indicating that the CA filtration membrane exhibited good antifouling properties. The filtration performance of the membranes was also evaluated using an oil-water emulsion and the flux was 93. 04% of the PWF with a rejection rate of 99. 85%. The rejection of CA filtration membranes prepared with PEG of different molecular weight was characterized by rejecting solutions of PEG with different molecular weight. The results showed that the rejection of PEG with the molecular weight bigger than that of the pore-forming agent reached above 90%. Dyes rejection studies conducted that the free-standing membrane prepared with low molecular weight of PEG can achieve the rejection rate of brilliant blue G250 as high as 99. 75% and can be used as a nano-filtration membrane.
Pages: 913-920
Year: 2015 Issue: 8
Journal: Acta Polymerica Sinica
Keyword: Calcium alginate; Hydrogel filtration membrane; Mechanical properties; Anti-fouling; Nanofiltration;
Abstract: A free-standing calcium alginate( CA) hydrogel filtration membrane was prepared using polyethylene glycol( PEG) as the pore-forming agent. The surface morphology of the filtration membrane was studied through SEM and digital photos. The relationships between flux and compression ratio,mechanical behavior of the filtration membranes were studied. The effects of the concentrations of sodium alginate( SA)and polyethylene glycol on the pure water flux( PWF) and filtration properties of lysozyme( Lyz) solutions were investigated. Results showed that CA filtration membrane prepared using a low SA concentration and a high PEG concentration had a high flux and compression rate. The PWF increased with increase in the pressure initially,and then reached a stable value. The fluxes of Lyz and bovine serum albumin( BSA) solutions were89. 97% and 94. 6% of the PWF,respectively,indicating that the CA filtration membrane exhibited good antifouling properties. The filtration performance of the membranes was also evaluated using an oil-water emulsion and the flux was 93. 04% of the PWF with a rejection rate of 99. 85%. The rejection of CA filtration membranes prepared with PEG of different molecular weight was characterized by rejecting solutions of PEG with different molecular weight. The results showed that the rejection of PEG with the molecular weight bigger than that of the pore-forming agent reached above 90%. Dyes rejection studies conducted that the free-standing membrane prepared with low molecular weight of PEG can achieve the rejection rate of brilliant blue G250 as high as 99. 75% and can be used as a nano-filtration membrane.
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