Tuo Ya, Liu Guangfei, Dong Bin, Yu Huali, Zhou Jiti, Wang Jing, Jin Ruofei
Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China.
Environ Sci Pollut Res Int. 2017 Feb;24(6):5249-5258. doi: 10.1007/s11356-016-8276-7. Epub 2016 Dec 21.
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 NaBH 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.
由于几何结构和电子性质的变化，双金属纳米颗粒通常被认为具有更高的催化活性和稳定性。在本研究中，嗜铁素还原希瓦氏菌MR-1在有无醌类物质存在的条件下合成了生物源钯（bio-Pd）、生物源铂（bio-Pt）和生物源钯铂（bio-PdPt）纳米颗粒。与直接微生物还原过程相比，添加蒽醌-2,6-二磺酸盐（AQDS）可提高钯（II）或/和铂（IV）的还原效率，并导致颗粒尺寸减小。所有类型的纳米颗粒都能催化硼氢化钠还原4-硝基苯酚，其催化活性顺序如下：bio-PdPt（AQDS）～bio-PdPt > bio-Pd（AQDS）> bio-Pd > bio-Pt（AQDS）～bio-Pt。此外，bio-PdPt（AQDS）纳米颗粒可重复使用6次。我们认为，这种简单高效的生物合成方法对于合成双金属生物源PdPt纳米催化剂，进而制备活性和稳定性良好的催化剂具有重要意义。
