Wen Xiao-Ju, Niu Cheng-Gang, Zhang Lei, Zeng Guang-Ming
College of Environmental Science Engineering, Key Laboratory of Environmental Biology Pollution Control, Ministry of Education, Hunan University, Changsha 410082, China.
Dalton Trans. 2017 Apr 11;46(15):4982-4993. doi: 10.1039/c7dt00106a.
Recently, visible-light-driven photocatalysts have been widely used in environmental pollutant remediation. In the present study, BiOI/CeO p-n junction photocatalysts were successfully fabricated using a facile in situ chemical bath method. The BiOI/CeO p-n junction photocatalysts exhibited excellent photoactivity for the decomposition of the refractory pollutant bisphenol A (BPA) and methylene orange (MO) under visible light illumination. The sample with a 1 : 1 mole ratio of BiOI : CeO possessed the highest photocatalytic performance out of all of the as-obtained catalysts. Mott-Schottky plots indicated that p-n junctions were successfully constructed between BiOI and CeO. The optical and electrical properties of the materials demonstrate that the introduction of BiOI can broaden the visible-light absorption region of CeO, and the transfer rate of the electron-hole pairs dramatically improves through forming a p-n junction. Furthermore, the BPA degradation efficiency exhibited excellent photostability after four consecutive cycles. These features show that the BiOI/CeO p-n junction has great application potential for refractory pollutant removal from wastewater.
近年来，可见光驱动的光催化剂已被广泛应用于环境污染物修复。在本研究中，采用简便的原位化学浴法成功制备了BiOI/CeO p-n结光催化剂。BiOI/CeO p-n结光催化剂在可见光照射下对难降解污染物双酚A（BPA）和亚甲基橙（MO）的分解表现出优异的光活性。在所有制备的催化剂中，BiOI与CeO摩尔比为1:1的样品具有最高的光催化性能。莫特-肖特基曲线表明BiOI和CeO之间成功构建了p-n结。材料的光学和电学性质表明，BiOI的引入可以拓宽CeO的可见光吸收区域，通过形成p-n结，电子-空穴对的转移速率显著提高。此外，经过四个连续循环后，BPA的降解效率表现出优异的光稳定性。这些特性表明，BiOI/CeO p-n结对废水中难降解污染物的去除具有巨大的应用潜力。
