Zhang Dan, Wang Fei, Cao Suzhen, Duan Xiaoli
School of Energy and Environmental Engineering, University of Science and Technology Beijing Xueyuan Road No. 30, Haidian District Beijing 100083 PR China
RSC Adv. 2018 Feb 5;8(11):5967-5975. doi: 10.1039/c7ra13460f. eCollection 2018 Feb 2.
In this study, BiOI photocatalyst was successfully synthesized a simple and rapid microwave irradiation method. The characterization of prepared photocatalysts was determined by powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectrometry (EDS), UV-vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL). The photocatalytic performance was determines by the degradation of bisphenol A (BPA) under xenon lamp illumination. The BiOI catalyst exhibited superior photocatalytic performance and the first-order kinetic rate constant of BiOI was about 4.2 times greater than that of BiOI. The enhanced photocatalytic activity was associated with surface morphology, suitable band gap energy and low recombination rate of electron-hole pairs. Furthermore, the photocatalytic efficiency of BPA with BiOI was systematically investigated using a three factor, three level Box-Behnken experimental design and response surface methodology (RSM). A quadratic polynomial model was proposed. Experimental and predicted values exhibited a good correlation with a predicted value of 0.9016. A relative significance study of three independent variables showed that catalyst dosage had the most significant positive effect on the degradation of BPA, followed by initial concentration of BPA and pH value. The prepared BiOI is a promising photocatalyst for practical application in organic pollutant decomposition.
在本研究中，通过一种简单快速的微波辐照方法成功合成了BiOI光催化剂。采用粉末X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、能量色散光谱（EDS）、紫外可见漫反射光谱（DRS）和光致发光（PL）对制备的光催化剂进行了表征。通过在氙灯照射下双酚A（BPA）的降解来测定光催化性能。BiOI催化剂表现出优异的光催化性能，BiOI的一级动力学速率常数约为BiOI的4.2倍。光催化活性的增强与表面形貌、合适的带隙能量以及电子-空穴对的低复合率有关。此外，采用三因素、三水平的Box-Behnken实验设计和响应面方法（RSM）系统研究了BiOI对BPA的光催化效率。提出了一个二次多项式模型。实验值和预测值显示出良好的相关性，预测值为0.9016。对三个自变量的相对显著性研究表明，催化剂用量对BPA降解的正向影响最为显著，其次是BPA的初始浓度和pH值。所制备的BiOI是一种在有机污染物分解实际应用中具有前景的光催化剂。
