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本文以水溶性壳聚糖(Water-soluble chitosan, WSC)为还原剂和稳定剂，同步还原HAuCl4和AgNO3,成功制备了金银双金属纳米粒子(Au-Ag NPs)。考察了金银前驱体体积比(V(HAuCl4)/V(AgNO3))、反应温度和时间、NaOH及WSC浓度的影响。采用紫外-可见吸收光谱(UV-vis)、傅里叶变换红外光谱(FT-IR)、透射电子显微镜(TEM)及能量色散X射线光谱(EDS)对Au-Ag NPs进行了表征。考察了Au-Ag NPs对4-硝基苯酚(4-NP)的催化还原性能。结果表明，以WSC为还原剂和稳定剂制备了平均粒径4 nm左右的球形或近球形Au-Ag NPs。Au-Ag NPs对4-NP的催化还原活性优于AuNPs和AgNPs, Au0.5Ag0.5(V(HAuCl4)/V(AgNO3)=1∶1)的催化活性最高。以Au0.5Ag0.5为催化剂时，在30℃下催化反应30 min, 4-NP的转化率可达到99.1%,反应速率常数为0.190 3 min-1,反应活化能Ea为31.1 kJ·mol-1。
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.
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基本信息:
DOI：10.16441/j.cnki.hdxb.20250102
中图分类号:O643.36;O621.251
引用信息:
[1]刘冰冰,李瑾,束召芹,等.金银双金属纳米粒子的制备及其对4-硝基苯酚的催化还原性能[J].中国海洋大学学报(自然科学版),2026,56(04):49-59.DOI:10.16441/j.cnki.hdxb.20250102.
基金信息:
山东省自然科学基金项目(ZR2021ME153)资助~~
2025-03-24
2025
2025-05-18
2025-05-20
2025
1
2026-03-31
2026-03-31