State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China; School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China.
Tsinghua University High School, Beijing 100085, China.
J Colloid Interface Sci. 2017 Nov 1;505:421-429. doi: 10.1016/j.jcis.2017.06.037. Epub 2017 Jun 13.
The visible-light-driven plasmonic photocatalyst silver chloride enwrapped silver/nitrogen-doped reduced graphene oxide (AgCl@Ag/N-rGO) was prepared by a facile hydrothermal-in situ oxidation method and characterized by Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FTIR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). The characterization results reveal that Ag nanoparticles (NPs) were first grafted on N-rGO via N-groups as anchor sites and then enwrapped by AgCl by in situ oxidation. Close interfacial contact favors efficient electron transfer, leading to high photoactivity and photostability for the degradation of various toxic organic pollutants. The photocatalytic performance of this photocatalyst was significantly higher than that of AgCl@Ag/rGO and other related photocatalysts due to the in situ introduction of N-groups. Additionally, the used catalyst can be recycled without an appreciable loss of catalytic activity. Based on electron spin resonance and cyclic voltammetry analyses, the electron transfer processes were confirmed to occur from plasmon-induced Ag NPs to AgCl and from N-rGO to Ag NPs, and pollutants could be oxidized through the loss of electrons to N-rGO by the interaction between the pollutants and N-rGO. The active species of superoxide anion radicals (O), photogenerated holes (h) and surface-adsorbed OH played roles in pollutant photodegradation. Accordingly, the plasmon-induced electron transfer processes elucidated photostability of AgCl@Ag/N-rGO. AgCl@Ag/N-rGO has a potential application in water purification due to its high photoactivity and photostability.
可见光驱动的等离子体光催化剂氯化银包裹的银/氮掺杂还原氧化石墨烯（AgCl@Ag/N-rGO）通过简便的水热原位氧化法制备，并通过扫描电子显微镜（SEM）、X 射线衍射（XRD）、傅里叶变换-红外光谱（FTIR）、拉曼光谱、X 射线光电子能谱（XPS）和紫外-可见漫反射光谱（UV-vis DRS）进行了表征。表征结果表明，Ag 纳米颗粒（NPs）首先通过 N 基团作为锚定点接枝到 N-rGO 上，然后通过原位氧化被 AgCl 包裹。紧密的界面接触有利于高效的电子转移，从而使该光催化剂具有高的光活性和光稳定性，可用于降解各种有毒有机污染物。由于原位引入了 N 基团，该光催化剂的光催化性能明显高于 AgCl@Ag/rGO 和其他相关光催化剂。此外，所使用的催化剂可以回收而不会明显损失催化活性。基于电子自旋共振和循环伏安分析，证实了电子转移过程是从等离子体诱导的 Ag NPs 到 AgCl 以及从 N-rGO 到 Ag NPs 发生的，并且污染物可以通过污染物与 N-rGO 之间的相互作用通过 N-rGO 失去电子而被氧化。超氧阴离子自由基（O）、光生空穴（h）和表面吸附 OH 的活性物质在污染物光降解中起作用。因此，阐明了 AgCl@Ag/N-rGO 光稳定性的等离子体诱导电子转移过程。AgCl@Ag/N-rGO 由于其高的光活性和光稳定性，在水净化方面具有潜在的应用。
