Interface modulation of bacteriogenic Ag/AgCl nanoparticles by boosting the catalytic activity for reduction reactions using Co2+ ions

Hao Zhou; Lin Che; Xuyun Guo; Xue Wang; Jingjing Zhan; Minghuo Wu; Yufeng Hu; Xianliang Yi; Xuwang Zhang; Lifen Liu

doi:10.1039/c7cc00684e

Interface modulation of bacteriogenic Ag/AgCl nanoparticles by boosting the catalytic activity for reduction reactions using Co²⁺ ions

Chem Commun (Camb). 2017 May 2;53(36):4946-4949. doi: 10.1039/c7cc00684e.

Authors

Hao Zhou¹, Lin Che, Xuyun Guo, Xue Wang, Jingjing Zhan, Minghuo Wu, Yufeng Hu, Xianliang Yi, Xuwang Zhang, Lifen Liu

Affiliation

¹ Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Food and Environment, Dalian University of Technology, Panjin, China. zhouhao@dlut.edu.cn.

PMID: 28422204
DOI: 10.1039/c7cc00684e

Abstract

Boosting the low catalytic activity of bacteriogenic Ag/AgCl nanoparticles (NPs) by adding Co²⁺ in a model reaction, i.e. p-nitrophenol (PNP) reduction, was observed. Under optimal conditions, Co-Ag/AgCl NPs show an apparent rate constant (k_app) of 0.0837 s^-1 upon PNP reduction. Considering the trace amount of Co-Ag/AgCl NPs used in catalysis (about 1.2 μg), the activity parameter κ (which is the ratio of k_app and catalyst mass) can reach more than 6.97 × 10⁴ s^-1 g^-1, which is 214-fold higher than that of pristine Ag/AgCl NPs. Meanwhile, this κ value is also the highest value reported to date. In addition, the biogenic Co-Ag/AgCl NPs exhibit superior catalytic activities over other substrates, such as m-nitrophenol, o-nitrophenol, methyl orange and rhodamine B. The activity enhancement mechanism is supposed to be that Co²⁺ acts as a Lewis acid, and coordinates with the surface peptides to affect the electric field distribution at the Ag/AgCl NP interface.