Hu Binjing, Sun Qiang, Zuo Chengyi, Pei Yunxin, Yang Siwei, Zheng Hui, Liu Fangming
College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, P.R. China.
Particulate Fluids Processing Centre, Department of Chemical Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia.
Beilstein J Nanotechnol. 2019 Jun 3;10:1157-1165. doi: 10.3762/bjnano.10.115. eCollection 2019.
A mild and simple method was developed to synthesize a highly efficient photocatalyst comprised of Ce-doped ZnO rods and optimal synthesis conditions were determined by testing samples with different Ce/ZnO molar ratios calcined at 500 °C for 3 hours via a one-step pyrolysis method. The photocatalytic activity was assessed by the degradation of a common dye pollutant found in wastewater, rhodamine B (RhB), using a sunlight simulator. The results showed that ZnO doped with 3% Ce exhibits the highest RhB degradation rate. To understand the crystal structure, elemental state, surface morphology and chemical composition, the photocatalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and inductively coupled plasma emission spectroscopy (ICP), respectively. The newly developed, robust, field-only surface integral method was employed to explore the relationship between the remarkable catalytic effect and the catalyst shape and porous microstructure. The computational results showed that the dipole-like field covers the entire surface of the rod-like Ce-doped ZnO photocatalyst and is present over the entire range of wavelengths considered. The optimum degradation conditions were determined by orthogonal tests and range analysis, including the concentration of RhB and catalyst, pH value and temperature. The results indicate that the pH value is the main influential factor in the photocatalytic degradation process and the optimal experimental conditions to achieve the maximum degradation rate of 97.66% in 2 hours are as follows: concentration (RhB) = 10 mg/L, concentration (catalyst) = 0.7 g/L, pH 9.0 and = 50 °C. These optimum conditions supply a helpful reference for large-scale wastewater degradation containing the common water contaminant RhB.
开发了一种温和且简单的方法来合成由铈掺杂的氧化锌棒组成的高效光催化剂，并通过一步热解方法对不同铈/氧化锌摩尔比的样品在500℃下煅烧3小时进行测试，确定了最佳合成条件。使用阳光模拟器通过降解废水中常见的染料污染物罗丹明B（RhB）来评估光催化活性。结果表明，掺杂3%铈的氧化锌表现出最高的RhB降解率。为了了解晶体结构、元素状态、表面形态和化学成分，分别通过X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）和电感耦合等离子体发射光谱（ICP）对光催化剂进行了表征。采用新开发的、稳健的、仅场表面积分方法来探索显著的催化效果与催化剂形状和多孔微观结构之间的关系。计算结果表明，偶极样场覆盖了棒状铈掺杂氧化锌光催化剂的整个表面，并且在所考虑的整个波长范围内都存在。通过正交试验和极差分析确定了最佳降解条件，包括RhB和催化剂的浓度、pH值和温度。结果表明，pH值是光催化降解过程中的主要影响因素，在2小时内实现最大降解率97.66%的最佳实验条件如下：浓度（RhB）=10mg/L，浓度（催化剂）=0.7g/L，pH 9.0，温度=50℃。这些最佳条件为大规模降解含有常见水污染物质RhB的废水提供了有益的参考。
