Liu Ruihua, Liu Juan, Kong Weiqian, Huang Hui, Han Xiao, Zhang Xing, Liu Yang, Kang Zhenhui
Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, China.
Dalton Trans. 2014 Jul 28;43(28):10920-9. doi: 10.1039/c4dt00630e.
Carbon dots (CDs) with abundant functional groups (-OH, -COOH, C=O) on their surface were specially designed to enhance the adsorption capacity and the catalytic activity of gold nanoparticles (AuNPs). The CDs stabilized gold nanoparticles (AuNPs-CDs) were greenly synthesized by a one-step reduction of HAuCl4 with CDs which were used as both the reductant and the stabilizer under visible light irradiation. The resulting AuNPs-CDs exhibit a high catalytic activity towards the reduction of 4-nitrophenol, with a good linear correlation of ln(C(i)/C0) versus time and a kinetic rate constant about 0.68 min(-1). Further detailed adsorption kinetics data indicated that the present adsorption system follows a predominantly second-order rate model, and the CDs capped on the surface of the AuNPs also enhanced the adsorption capacity and the catalytic activity of the AuNPs.
表面具有丰富官能团（-OH、-COOH、C=O）的碳点（CDs）经过特殊设计，以提高金纳米颗粒（AuNPs）的吸附能力和催化活性。通过在可见光照射下用CDs一步还原HAuCl4，绿色合成了由CDs稳定的金纳米颗粒（AuNPs-CDs），其中CDs既用作还原剂又用作稳定剂。所得的AuNPs-CDs对4-硝基苯酚的还原表现出高催化活性，ln(C(i)/C0)与时间具有良好的线性相关性，动力学速率常数约为0.68 min(-1)。进一步详细的吸附动力学数据表明，当前的吸附系统主要遵循二级速率模型，并且包覆在AuNPs表面的CDs也提高了AuNPs的吸附能力和催化活性。
