Enhancing visible-light-induced photocatalytic activity of BiOI microspheres for NO removal by synchronous coupling with Bi metal and graphene
Enhancing visible-light-induced photocatalytic activity of BiOI microspheres for NO removal by synchronous coupling with Bi metal and graphene
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通过与Bi金属和石墨烯同步耦合增强BiOI微球去除NO的可见光诱导光催化活性
DOI：
10.1016/j.apsusc.2018.10.246
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发表时间：
2019-02
影响因子：
6.7
通讯作者：
Yang Woochul
中科院分区：
文献类型：
--
作者：
Zhu Gangqiang;Hojamberdiev Mirabbos;Zhang Shaolin;Din Syed Taj Ud;Yang Woochul
为了进一步提高其光催化活性，通过Bi金属和石墨烯在溶剂热条件下同步偶联来活化BiOI微球。特别研究了合成温度（160-200°C）对结晶度、形貌和光催化活性的影响。正如预期的那样，在 180°C 下合成的三元 Bi-BiOI/石墨烯光催化剂在可见光照射下表现出比单独的 BiOI、二元 Bi-BiOI 和 BiOI/石墨烯复合材料更高的光催化活性。在180℃合成的三元Bi-BiOI/石墨烯光催化剂在可见光照射30分钟内光催化去除NO的效率达到51.8%。三元Bi-BiOI/石墨烯光催化剂的光催化活性增强归因于（I）光生电子从BiOI和Bi到石墨烯的有效转移，导致光生电子-空穴对的有效分离和（II）复合光催化剂中Bi纳米粒子的表面等离子体共振效应。此外，清除剂实验和DMPO-ESR自旋捕获测量的结果表明，在可见光照射下180BOI/GR复合材料氧化去除NO的过程中，自由基dotO2−自由基物种发挥着最关键的作用，空穴作为次要活性物种。
In order to further improve its photocatalytic activity, the BiOI microspheres were activated by a synchronous coupling of Bi metal and graphene under solvothermal conditions. The effects of the synthesis temperature (160–200 °C) on crystallinity, morphology, and photocatalytic activity were studied in particular. As expected, the ternary Bi-BiOI/graphene photocatalyst synthesized at 180 °C exhibited higher photocatalytic activity for NO oxidation removal under visible light irradiation than individual BiOI, and binary Bi-BiOI and BiOI/graphene composites. The photocatalytic efficiency for the NO removal of the ternary Bi-BiOI/graphene photocatalyst synthesized at 180 °C reached 51.8% within 30 min of visible light irradiation. The enhanced photocatalytic activity of the ternary Bi-BiOI/graphene photocatalyst is attributed to (I) the efficient transfer of photo-generated electrons from BiOI and Bi to graphene, leading to the effective separation of the photo-generated electron-hole pairs and (II) the surface plasmon resonance effect of Bi nanoparticles in the composite photocatalyst. Furthermore, the results of the scavenger experiments and DMPO-ESR spin-trapping measurements reveal that radical dotO2−radical species play the most critical role and holes serve as a secondary active species in the oxidative removal process of NO by 180BOI/GR composite under visible light irradiation.
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影响因子：
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