碳酸氧铋纳米线增强的紫外-可见响应及其对黄原酸盐的降解和光催化反应机制。
Enhanced UV-visible response of bismuth subcarbonate nanowires for degradation of xanthate and photocatalytic reaction mechanism.
机构信息
Powder Metallurgy Research Institute, Central South University, Changsha 410083, China; School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
Powder Metallurgy Research Institute, Central South University, Changsha 410083, China.
出版信息
Chemosphere. 2016 Apr;149:245-53. doi: 10.1016/j.chemosphere.2016.01.111. Epub 2016 Feb 8.
(BiO)2CO3 nanowires were prepared by simple hydrothermal treatment of commercial Bi2O3 powders and characterized by X-ray diffractometry, scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of (BiO)2CO3 nanowires was studied through degradation of sodium isopropyl xanthate. Photocatalytic experimental results indicated that the as-prepared (BiO)2CO3 nanowires show high photocatalytic efficiency. Photocatalytic activity increased after two cycles. Time-dependent UV-vis spectra demonstrated that the final degradation products included isopropyl alcohol and carbon disulfide. UV-vis diffuse reflection spectra showed that the band gap of the as-prepared (BiO)2CO3 nanowires and recycled (BiO)2CO3 nanowires were 2.75 eV and 1.15 eV, respectively. XPS results indicated that formation of Bi2S3@(BiO)2CO3 core-shell nanowires occurred after recycled photodegradation of isopropyl xanthate owing to existence of two types of Bi configurations in the recycled (BiO)2CO3 nanowires. A probable degradation mechanism of isopropyl xanthate was also proposed.
（BiO）2CO3 纳米线通过简单的水热法处理商业 Bi2O3 粉末制备，并通过 X 射线衍射仪、扫描电子显微镜、透射电子显微镜（TEM）、高分辨率 TEM 和 X 射线光电子能谱（XPS）进行了表征。通过降解异丙基黄原酸钠研究了（BiO）2CO3 纳米线的光催化活性。光催化实验结果表明，所制备的（BiO）2CO3 纳米线具有很高的光催化效率。经过两次循环后，光催化活性增加。时间依赖性紫外可见光谱表明，最终的降解产物包括异丙醇和二硫化碳。紫外可见漫反射光谱表明，所制备的（BiO）2CO3 纳米线和回收的（BiO）2CO3 纳米线的带隙分别为 2.75 eV 和 1.15 eV。XPS 结果表明，由于回收的（BiO）2CO3 纳米线中存在两种类型的 Bi 构型，在异丙基黄原酸钠的回收光降解后形成了 Bi2S3@（BiO）2CO3 核壳纳米线。还提出了异丙基黄原酸钠的可能降解机制。
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