Ag-single atoms modified S_(1.66) -N_(1.91)/TiO_(2 -x) for photocatalytic activation of peroxymonosulfate for bisphenol A degradation
Ag-single atoms modified S_(1.66) -N_(1.91)/TiO_(2 -x) for photocatalytic activation of peroxymonosulfate for bisphenol A degradation
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Ag单原子修饰S_(1.66)-N_(1.91)/TiO_(2-x)光催化活化过一硫酸盐降解双酚A
DOI：
10.1016/j.cclet.2021.08.085
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发表时间：
2022
影响因子：
9.1
通讯作者：
Niu Junfeng
中科院分区：
文献类型：
--
作者：
Wang Tian;Zhou Jianjun;Wang Wenjuan;Zhu Yunqing;Niu Junfeng
本研究采用原位光还原法制备了Ag 0.23/（S1.66-N1.91/TiO 2-x）单原子光催化剂，并将其用于可见光下过硫酸钾（PMS）的非均相活化降解双酚A（BPA）。采用X射线衍射（XRD）、拉曼光谱、X射线光电子能谱（XPS）、高分辨透射电子显微镜（HR-TEM）、紫外-可见漫反射光谱（UV-vis DRS）、电子顺磁共振（EPR）等测试手段对样品的结构、物理化学性质、形貌和电子性质进行了表征。Ag_（0.23）/（S_（1.66）-N_（1.91）/TiO_（2 -x））单原子光催化剂对BPA的协同降解活性是其对应物的2.4倍，BPA的矿化率也达到48.73%。这归因于均匀分散的金属Ag原子作为活性位，用于加速光生载流子的迁移速率以产生高活性自由基。EPR实验表明，SO_4 · -和· OH共同参与了BPA的降解。
In this study, Ag 0.23/(S_(1.66) -N_(1.91)/TiO_(2 -x)) single-atom photocatalyst was synthesized by in-situ photoreducing of silver on S,N-TiO_(2 -x) nanocomposite and used to degrade bisphenol A (BPA) through heterogeneous activation of potassium peroxymonosulfate (PMS) under visible-light illumination. The structure, physicochemical property, morphology, and electronic property were evalutated by X-ray diffraction (XRD), Raman spectrum, X-ray photoelectron spectra (XPS), high-resolution transmission electron microscopy (HR-TEM), UV-vis diffuse reflectance spectra (UV-vis DRS), electron paramagnetic resonance (EPR) spectrum. Ag_(0.23)/(S_(1.66) -N_(1.91)/TiO_(2 -x)) single-atom photocatalyst exhibited 2.4 times higher activity for the synergetic degradation of BPA than that of its counterpart, and 48.73% mineralization rate of BPA also achieved. It was ascribed to the uniformly-dispersed metallic Ag atoms as the active site for accelerating the migration rate of photo-generated carrier for generation of high reactive radicals. The EPR experiments indicated that SO_4 · - and · OH was jointly involved in BPA degradation.