Performance investigation of Fe3O4 blended poly (vinylidene fluoride) membrane on filtration and benzyl alcohol oxidation: Evaluation of sufficiency for catalytic reactors

doi:10.1016/j.cjche.2018.05.006

摘要/Abstract

摘要： Fe₃O₄-PVDF membranes were prepared by blending of magnetic Fe₃O₄ powders with polyvinylidene fluoride to investigate whether those were usable or not in catalytic membrane reactors. Filtration performances and catalytic activity of membranes in microwave conditions were measured in separate processes. Composite Fe₃O₄-PVDF membranes were characterized by TG-DTA, FTIR, XRD, SEM and contact angle techniques. Disappearing of α-phases at PVDF was observed with increasing amount of additives from XRD diffraction patterns. Decomposition of polymer fastened due to catalytic effect of Fe₃O₄. Finger-like structures and large number of small pores were observed at the SEM images. Those provided effective transportation of substrate among the active sites of catalyst. At the experiments conducted in batch reactor, 51%, 77%, 66% and 63% benzyl alcohol conversion were recorded for 2%, 4%, 6% and 8% Fe₃O₄-PVDF composite pieces respectively. Catalyst were separated magnetically and reused several times. On the other hand Fe₃O₄ blended PVDF membranes provided improved flux and BSA rejection compared with performance of bare PVDF membrane; 41.6% BSA rejection was obtained with 4% Fe₃O₄-PVDF whereas it was only 6.7% for PVDF. Fe₃O₄-PVDF composites performed high activity for the benzyl alcohol oxidation in batch reactor and also better filtration at filtration cell. These results promise to obtain practical and low cost membrane material for catalytic reactors usable in microwave support to get fast results.

关键词: Benzyl alcohol oxidation, Magnetic iron oxide, Polymer supported catalyst, PVDF filtration membranes

Abstract: Fe₃O₄-PVDF membranes were prepared by blending of magnetic Fe₃O₄ powders with polyvinylidene fluoride to investigate whether those were usable or not in catalytic membrane reactors. Filtration performances and catalytic activity of membranes in microwave conditions were measured in separate processes. Composite Fe₃O₄-PVDF membranes were characterized by TG-DTA, FTIR, XRD, SEM and contact angle techniques. Disappearing of α-phases at PVDF was observed with increasing amount of additives from XRD diffraction patterns. Decomposition of polymer fastened due to catalytic effect of Fe₃O₄. Finger-like structures and large number of small pores were observed at the SEM images. Those provided effective transportation of substrate among the active sites of catalyst. At the experiments conducted in batch reactor, 51%, 77%, 66% and 63% benzyl alcohol conversion were recorded for 2%, 4%, 6% and 8% Fe₃O₄-PVDF composite pieces respectively. Catalyst were separated magnetically and reused several times. On the other hand Fe₃O₄ blended PVDF membranes provided improved flux and BSA rejection compared with performance of bare PVDF membrane; 41.6% BSA rejection was obtained with 4% Fe₃O₄-PVDF whereas it was only 6.7% for PVDF. Fe₃O₄-PVDF composites performed high activity for the benzyl alcohol oxidation in batch reactor and also better filtration at filtration cell. These results promise to obtain practical and low cost membrane material for catalytic reactors usable in microwave support to get fast results.

Key words: Benzyl alcohol oxidation, Magnetic iron oxide, Polymer supported catalyst, PVDF filtration membranes

Huseyin Gumus. Performance investigation of Fe₃O₄ blended poly (vinylidene fluoride) membrane on filtration and benzyl alcohol oxidation: Evaluation of sufficiency for catalytic reactors[J]. Chinese Journal of Chemical Engineering, 2019, 27(2): 314-321.

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Performance investigation of Fe₃O₄ blended poly (vinylidene fluoride) membrane on filtration and benzyl alcohol oxidation: Evaluation of sufficiency for catalytic reactors

Performance investigation of Fe₃O₄ blended poly (vinylidene fluoride) membrane on filtration and benzyl alcohol oxidation: Evaluation of sufficiency for catalytic reactors

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