Synergetic effect of BiOCl/Bi12O17Cl2 and MoS2: in situ DRIFTS investigation on photocatalytic NO oxidation pathway
Synergetic effect of BiOCl/Bi12O17Cl2 and MoS2: in situ DRIFTS investigation on photocatalytic NO oxidation pathway
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BiOCl/Bi12O17Cl2 和 MoS2 的协同效应：光催化 NO 氧化途径的原位 DRIFTS 研究
DOI：
10.1007/s12598-019-01230-5
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发表时间：
2019
期刊：
影响因子：
8.8
通讯作者：
Dong Fan
中科院分区：
文献类型：
--
作者：
Zhang Wen Dong;Dong Xing An;Liang Yi;Liu Rui;Sun Yan Juan;Dong Fan
采用一种简单的方法在室温下成功地合成了BiOCl/Bi12O17Cl2@MoS2（BOC-MS）复合材料。采用X射线衍射仪（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）、紫外-可见漫反射光谱（UV-Vis DRS）、光致发光（PL）、Brunauer-Emmett-Teller-Barrett-Joyner-Halenda（BET-BJH）和电子自旋共振（ESR）等手段对样品的理化性质进行了表征。此外，原位漫反射红外光谱（DRIFTS）被用来阐明吸附和光催化反应机理。优化后的BOC-MS-1.0复合材料具有良好的可见光催化活性（51.1%）和光化学稳定性，对NO具有良好的去除效果。DMPO-ESR自旋捕集结果表明，BOC-MS-1.0复合材料在可见光照射下产生的主要活性物种为·O2−自由基和·OH自由基。MoS 2的光催化性能的提高主要归因于MoS 2的正协同效应和有效的载体分离能力。
The BiOCl/Bi12O17Cl2@MoS2 (BOC-MS) composites were successfully synthesized by a facile method at room temperature. The physicochemical properties of the as-obtained samples were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), ultraviolet–visible diffuse reflection spectra (UV–Vis DRS), photoluminescence (PL), Brunauer–Emmett–Teller–Barrett–Joyner–Halenda (BET–BJH), and electron spin resonance (ESR) in detail. Moreover, the in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was applied to elucidate the adsorption and photocatalytic reaction mechanism. The optimized BOC-MS-1.0 composites exhibited excellent visible light photocatalytic capability (51.1%) and photochemical stability for removal of NO. Based on the DMPO-ESR spin trapping, the ·O2− radicals and ·OH radicals were identified as the main active species generated from BOC-MS-1.0 under visible light irradiation. The enhanced photocatalytic performance can be ascribed to the positive synergetic effect of the MoS2 and the effective carrier separation ability.