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首页> 外文期刊>Journal of Photochemistry and Photobiology, A. Chemistry >Preparation and characterization of bismuth oxychloride/reduced graphene oxide for photocatalytic degradation of rhodamine B under white-light light-emitting-diode and sunlight irradiation
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Preparation and characterization of bismuth oxychloride/reduced graphene oxide for photocatalytic degradation of rhodamine B under white-light light-emitting-diode and sunlight irradiation

机译：白光发光二极管下罗达胺B光催化降解氯甲烷烃/氧化锑/氧化石墨烯氧化物的制备及表征及阳光辐照

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摘要

Facile and template-free two-step synthesis of bismuth oxychloride/graphene oxide (BiOCl/GO) and bismuth oxychloride/reduced graphene oxide (BiOCl/rGO) photocatalysts for degradation of rhodamine B (RhB) under low-power white light-emitting diode (wLED) irradiation (1.6 W/cm(2)) and sunlight is demonstrated. These photocatalysts were characterized by transmission electron microscopy, scanning electron microscopy, energy dispersive X-ray spectrometry, X-ray diffraction, and micro-Raman, Fourier-transform infrared, X-ray photoelectron, and UV-Vis diffuse reflectance spectroscopy. Under wLED irradiation, the prepared BiOCl/rGO photocatalysts exhibited excellent photodegradation activity toward RhB through chromophore cleavage mechanism and toward phenol in the presence of RhB with notable dye-sensitized effect. Through scavenging experiments, superoxide radicals were notably involved in RhB degradation. With the highest charge separation efficiency and lowest recombination rate, the photocatalytic activity of BiOCl/rGO reached a maximum rate constant of 0.1899 min(-1), 2.0 and 3.0 times higher than those of BiOCl/GO and BiOCl, respectively. In the stability study, only a slight loss (4.5%) in photodegradation was observed after BiOCl/rGO was used in five cycles of photodegradation runs. Compared with commonly used photocatalyst such as TiO2 (P25), BiOCl/rGO demonstrated superior photocatalytic activity and stability under wLED irradiation for various dyestuffs (rhodamine 6 G, methylene blue, and fast green FCF) in different environmental water samples (lake, pond, and sea water).
机译：在低功率白色发光二极管下，无氧化氯化乙酰氯化物/石墨烯氧化物（BioCl / Go）和铋/氧化氧乙酰氧化物（BioCl / Rgo）光催化剂的乳酸氧烷烯（BioCl / Go）和乳酸铋/氧化物（BioCl / Rgo）光催化剂（WLED）辐照（1.6 W / cm（2））和阳光明显。这些光催化剂的特征在于透射电子显微镜，扫描电子显微镜，能量分散X射线光谱，X射线衍射和微拉曼，傅立叶变换红外，X射线光电子和UV-VI扩散反射光谱。在WLED照射下，制备的BioCl / Rgo光催化剂通过发色团裂解机制和苯酚在具有显着染料致敏作用的情况下向苯酚表现出优异的光降解活性。通过清除实验，超氧化物自由基显着参与RHB降解。具有最高电荷分离效率和最低重组率，BioCl / Rgo的光催化活性分别比BioCl / Go和BioCl的最大速率常数为0.1899 min（-1），2.0％和3.0倍。在稳定性研究中，在5个光降解运行的5个循环中使用后，仅观察到光降解中的轻微损失（4.5％）。与常用的光催化剂如TiO 2（P25），BioCl / Rgo在不同环境水样中的各种染料（罗丹明6g，亚甲基蓝色和快绿色Fcf）下显示出优异的光催化活性和稳定性，不同的环境水样（湖泊，池塘，和海水）。

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