@article{Liu2026, 
author = {Bingbing Liu and Jin Li and Zhaoqin Shu and Lian Zhong},
title = {Synthesis of Gold-Silver Bimetallic Nanoparticles and Catalytic Reduction of 4-Nitrophenol},
year = {2026},
journal = {Periodical of Ocean University of China},
volume = {56},
number = {4},
pages = {49-59},
keywords = {gold-silver bimetallic nanoparticles, water-soluble chitosan, 4-nitrophenol, catalytic reduction performance},
url = {https://www.sciopen.com/article/10.16441/j.cnki.hdxb.20250102},
doi = {10.16441/j.cnki.hdxb.20250102},
abstract = {Gold-silver bimetallic nanoparticles (Au-Ag NPs) were successfully synthesized by simultaneous reduction of HAuCl4 and AgNO3 using water-soluble chitosan (WSC) as the reducing agent and stabilizer. The effects of the volume ratio of gold and silver precursors(V(HAuCl4)/V(AgNO3)), reaction temperature and time, NaOH and WSC concentration were investigated. The Au-Ag NPs were characterized by ultraviolet-visible absorption spectroscopy (UV-vis), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS). The catalytic reduction performance of Au-Ag NPs towards 4-nitrophenol (4-NP) was investigated. The results showed that spherical or nearly spherical Au-Ag NPs with an average particle size of 4 nm were prepared using WSC as the reducing agent and stabilizer. The catalytic reduction activity of Au-Ag NPs towards 4-NP was better than that of AuNPs and AgNPs, and the highest catalytic activity was obtained for Au0.5Ag0.5(V(HAuCl4)/V(AgNO3)=1∶1). When Au0.5Ag0.5 was used as catalyst, the conversion of 4-NP could reach 99.1% when the catalytic reaction was carried out at 30 ℃for 30 min, the reaction rate constant was 0.190 3 min-1, and the reaction activation energy Ea was 31.1 kJ·mol-1.}
}