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Coupling membrane and Fe–Pd bimetallic nanoparticles for trichloroethene removing from water
Bangkai Li,Xi Chen,Kun Li,Chenghao Zhang,Yang He,Runhong Du,Jianzu Wang,Li Chen 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
A novel composite membrane with membrane pores loading acrylic acid microgels coated by Fe–Pdbimetallic nanoparticles (NPs) was prepared for the dechlorination of trichloroethene (TCE) in water. Thismembrane was prepared byfirstly immobilizing acrylic acid microgels in poly (vinylidenefluoride)(PVDF) membrane pores and then in-situ synthesis of Fe–Pd bimetallic nanoparticles (NPs). The Fe–PdNPs coupled with the porous membranes enabled dechlorination to be conducted in a cross-flow modelincluding a penetrativeflow and a tangentialflow. In such a model, a large number of dechlorinationoccurred in penetrativeflowfluid while no dechlorination occurred in tangentialflowfluid. Thus,products and reactants are always timely isolated in the cross-flow dechlorination process. Thecomposite membrane prevents Fe–Pd NPs from contamination because its nanosize surface pores stopcolloids and bovine serum albumin (BSA) from entering into the membrane interior. However, thesesmall surfaces pores cannot slow the diffusion of reactants into membrane pores, and thus make the asformedcomposite membrane also show a fast dechlorination rate in a batch reaction. All in all, TCEdechlorination by the composite membrane shows many advantages including the fast dechlorinationrate, the convenient operation, the timely isolation of products from reactants, and the ignorable extrasteps for separation of metal NPs.
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