Zeng Xingye, Xiao Xinyan, Chen Jiayi, Wang Yi, Wang Hanlu
School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Guangzhou 510640, PR China; College of Chemical Engineering, Guangdong University of Petrochemical Technology, Maoming, 525000, PR China.
School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Guangzhou 510640, PR China.
J Hazard Mater. 2020 Jun 5;391:122198. doi: 10.1016/j.jhazmat.2020.122198. Epub 2020 Jan 30.
Two kinds of well-crystallized BiOCl singlet-crystalline sheets (BOC-01 with twin-facet co-exposure of {001} and {110} and BOC-02 with tri-facet co-exposure of {001}, {110}, and {010}) were prepared and characterized. The photocatalytic desulfurization performance of BOC-01 and BOC-02 was tested by using n-decane and tetradecane as model oil containing heterocyclic sulfur-containing compounds (benzothiophene, or dibenzothiophene, or 4,6-dimethyldibenzothiophene). The desulfurization performance showed that twin-facet co-exposed BOC-01 had a slightly higher photocatalytic activity than tri-facet co-exposed BOC-02. The differences of photocatalytic activity between BOC-01 and BOC-02 were further explored by paramagnetic resonance spectroscopy, ultraviolet diffuse reflectance spectroscopy, steady-state and time-resolved prompt fluorescencespectra. The results disclosed that the exciton effect in BOC-01 played a key role in photocatalytic activation of molecular oxygen, while BOC-02 mainly produced reactive oxygen species by charge transfer. Theoretical calculations further indicated that the photogenerated electrons are mainly distributed on the {110} facets and the photogenerated holes are mainly distributed on the {001} facets in BOC-01 and BOC-02. This work provides a useful clue for an in-depth understanding of the effects of co-exposed facets in BiOCl on photocatalytic performance.
制备并表征了两种结晶良好的BiOCl单晶片（BOC-01具有{001}和{110}的双晶面共暴露，BOC-02具有{001}、{110}和{010}的三晶面共暴露）。以正癸烷和十四烷作为含杂环硫化合物（苯并噻吩、二苯并噻吩或4,6-二甲基二苯并噻吩）的模型油，测试了BOC-01和BOC-02的光催化脱硫性能。脱硫性能表明，双晶面共暴露的BOC-01比三晶面共暴露的BOC-02具有略高的光催化活性。通过顺磁共振光谱、紫外漫反射光谱、稳态和时间分辨瞬态荧光光谱进一步探究了BOC-01和BOC-02之间光催化活性的差异。结果表明，BOC-01中的激子效应在分子氧的光催化活化中起关键作用，而BOC-02主要通过电荷转移产生活性氧物种。理论计算进一步表明，在BOC-01和BOC-02中，光生电子主要分布在{11}晶面上，光生空穴主要分布在{001}晶面上。这项工作为深入理解BiOCl中共暴露晶面对光催化性能的影响提供了有用的线索。
