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Microbial synthesis of bimetallic PdPt nanoparticles for catalytic reduction of 4-nitrophenol
- Tuo, Ya, Liu, Guangfei, Dong, Bin, Yu, Huali, Zhou, Jiti, Wang, Jing, Jin, Ruofei
- Environmental science and pollution research international 2017 v.24 no.6 pp. 5249-5258
- Shewanella oneidensis, biosynthesis, catalysts, catalytic activity, geometry, nanoparticles, p-nitrophenol
- Bimetallic nanoparticles are generally believed to have improved catalytic activity and stability due to geometric and electronic changes. In this work, biogenic-Pd (bio-Pd), biogenic-Pt (bio-Pt), and biogenic-PdPt (bio-PdPt) nanoparticles were synthesized by Shewanella oneidensis MR-1 in the absence or presence of quinone. Compared with direct microbial reduction process, the addition of anthraquinone-2,6-disulfonate (AQDS) could promote the reduction efficiency of Pd(II) or/and Pt(IV) and result in decrease of particles size. All kinds of nanoparticles could catalyze 4-nitrophenol reduction by NaBH₄ and their catalytic activities took the following order: bio-PdPt (AQDS) ∼ bio-PdPt > bio-Pd (AQDS) > bio-Pd > bio-Pt (AQDS) ∼ bio-Pt. Moreover, the bio-PdPt (AQDS) nanoparticles could be reused for 6 cycles. We believe that this simple and efficient biosynthesis approach for synthesizing bimetallic bio-PdPt nanocatalysts is important for preparing active and stable catalysts.