In-situ decoration of metallic Bi on BiOBr with exposed (110) facets and surface oxygen vacancy for enhanced solar light photocatalytic degradation of gaseous n-hexane
In-situ decoration of metallic Bi on BiOBr with exposed (110) facets and surface oxygen vacancy for enhanced solar light photocatalytic degradation of gaseous n-hexane
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BiOBr 上金属 Bi 的原位修饰，具有暴露的 (110) 面和表面氧空位，用于增强太阳光光催化降解气态正己烷
DOI：
10.1016/s1872-2067(19)63496-0
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发表时间：
2020-10
影响因子：
16.5
通讯作者：
An Taicheng
中科院分区：
文献类型：
--
作者：
Yu Qingqing;Chen Jiangyao;Li Yanxu;Wen Meicheng;Liu Hongli;Li Guiying;An Taicheng
铋系半导体在太阳光照射下对气态污染物的光催化降解已引起人们的广泛关注。然而，它们在气态直链烷烃提纯中的应用还很少。本文采用溶剂热法合成了一系列BiOBr光催化复合材料，并将其应用于太阳光驱动光催化降解正己烷。表征结果表明，乙醇溶剂(从甲醇、乙二醇到甘油)官能团数目的增加和溶剂热温度的升高(从160℃和180℃到200℃)都有利于在具有裸露的(110)晶面的BiOBR纳米板上原位形成金属铋纳米球。同时，在这些暴露的面上观察到了铋与BiOBr之间的化学键，从而导致了表面氧空位的形成。此外，最佳表面氧空位在(110)晶面的协同作用使其具有较高的可见光响应、较窄的禁带宽度、较大的光电流、较低的载流子复合速率以及较强的·O2-和h+形成，在15ppmv的正己烷作用120min内，对BiOBR的去除效率最高，达到97.4%。我们的发现有效地拓宽了铋基光催化技术在石油化工排放的气态直链污染物净化中的应用。
Photocatalytic degradation of gaseous pollutants on Bi-based semiconductors under solar light irradiation has attracted significant attention. However, their application in gaseous straight-chain alkane purification is still rare. Here, a series of Bi/BiOBr composites were solvothermally synthesized and applied in solar-light-driven photocatalytic degradation of gaseousn-hexane. The characterization results revealed that both increasing number of functional groups of alcohol solvent (from methanol and ethylene glycol to glycerol) and solvothermal temperature (from 160 and 180 to 200 °C) facilitated the in-situ formation of metallic Bi nanospheres on BiOBr nanoplates with exposed (110) facets. Meanwhile, chemical bonding between Bi and BiOBr was observed on these exposed facets that resulted in the formation of surface oxygen vacancy. Furthermore, the synergistic effect of optimum surface oxygen vacancy on exposed (110) facets led to a high visible light response, narrow band gap, great photocurrent, low recombination rate of the charge carriers, and strong •O2–and h+formation, all of which resulted in the highest removal efficiency of 97.4% within 120 min of 15 ppmv ofn-hexane on Bi/BiOBr. Our findings efficiently broaden the application of Bi-based photocatalysis technology in the purification of gaseous straight-chain pollutants emitted by the petrochemical industry.
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