Department of Chemistry, Shahreza Branch, Islamic Azad University, P. O. Box, 311-86145, Shahreza, Isfahan, Islamic Republic of Iran.
Chemosphere. 2022 Nov;307(Pt 2):135925. doi: 10.1016/j.chemosphere.2022.135925. Epub 2022 Aug 8.
The synergistic photocatalytic activity was obtained when CdS and BiVO nanoparticles (NPs) were coupled. The samples were characterized by XRD, FTIR, SEM-EDX, and UV-DRS techniques, and their pHpzc was also estimated. The crystallite size of the coupled sample was estimated at 37.3 and 12.5 nm by the Scherrer and Williamson-Hall equations, respectively. The band gaps and the potential positions of VB and CB levels of the semiconductors used were determined. The highest boosted photocatalytic activity was obtained when the CdS: BiVO mole ratio was 1:1. RSM studied the simultaneous interactions between the selected variables, and the model F-value of 110.61> F = 2.4 accompanied by the LOF F-value of 5.20 < F = 8.79 confirm the model significance. The correlation coefficients of R = 0.9861, the adjusted R = 0.9710, and the predicted R = 0.9417, also establish a satisfactory model for processing the experimental data. In the scavenging agent study, photodegradation mechanisms were suggested; among them, the direct Z-scheme mechanism is more favorable for illustrating the EBT-photodegradation by the binary CdS-BiVO photocatalyst. The proposed system, especially the direct Z-scheme mechanism, is suitable as a potential hydrogen production system.
当 CdS 和 BiVO 纳米粒子 (NPs) 耦合时，会获得协同光催化活性。使用 XRD、FTIR、SEM-EDX 和 UV-DRS 技术对样品进行了表征，并估计了它们的 pHpzc。通过谢勒和威廉姆森-霍尔方程，分别估计了耦合样品的晶粒尺寸为 37.3 和 12.5nm。确定了半导体的带隙和 VB 和 CB 能级的电位位置。当 CdS:BiVO 摩尔比为 1:1 时，获得了最高的增强光催化活性。RSM 研究了所选变量之间的同时相互作用，F 值为 110.61>F=2.4，伴随失拟 F 值为 5.20<F=8.79，证实了模型的显著性。相关系数 R=0.9861、调整后的 R=0.9710 和预测的 R=0.9417，也为处理实验数据建立了令人满意的模型。在清除剂研究中，提出了光降解机制；其中，直接 Z 型机制更有利于说明二元 CdS-BiVO 光催化剂对 EBT 的光降解。所提出的系统，特别是直接 Z 型机制，适合作为潜在的制氢系统。
