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Catalytic Membrane Reactor Immobilized with Alloy Nanoparticle-Loaded Protein Fibrils for Continuous Reduction of 4-Nitrophenol

Huang, Renliang, Zhu, Hongxiu, Su, Rongxin, Qi, Wei, He, Zhimin
Environmental Science & Technology 2016 v.50 no.20 pp. 11263-11273
alloys, antibacterial properties, batch systems, beta-lactoglobulin, copper, nanoparticles, p-nitrophenol, reducing agents
A catalytic membrane reactor, which contains a membrane matrix and a catalytic film of alloy nanoparticle-loaded β-lactoglobulin fibrils (NPs@β-LGF), was developed for the continuous-flow reduction of 4-nitrophenol (4-NP). The Cu–Ag and Cu–Ag–Au alloy NPs were synthesized using β-LGF as a scaffold and stabilizing agent. In this process, the Cu nanoclusters were formed in the initial stage and were able to promote the synthesis of Ag⁰, which acts as a reducing agent for the rapid formation of Au⁰. Furthermore, a catalytic membrane reactor was constructed by depositing the NPs@β-LGFs on a membrane matrix. The catalytic activity of the Cu–Ag–Au alloy NPs was higher than that of the Cu–Ag alloy NPs, using the reduction of 4-NP to 4-AP as a model reaction. The observed rate constant in the continuous-flow system is also higher than that in the batch system. In addition, these catalytic membrane reactors had good operating stability and antibacterial activity.