Z型异质结BiVO4-Pt-TiO2纳米管的制备及光电催化降解头孢唑啉钠的性能研究
- Preparation of Z-type heterojunction BiVO4-Pt-TiO2 nanotubes and photoelectrocatalytic degradation of sodium cefazolin
- 基金项目：陕西省重点研发计划项目(2023-YBSF-475)
- 摘要：新污染物抗生素的大量使用,对水环境健康产生了巨大的威胁.本文通过光沉积法和水热法制备了Z型异质结构的BiVO4-Pt-TiO2纳米管电极,对其进行了结构表征与电化学分析,并应用于头孢唑啉钠模拟废水的降解.通过SEM、XPS等分析,TiO2纳米管的管径约为90 nm,表面存在少量Pt单质和BiVO4纳米片. I-t、EIS和M-S分析结果表明,改性后纳米管的光电流密度提高了10倍,电子-空穴对分离效率更高.以BiVO4-Pt-TiO2纳米管作为工作电极,对头孢唑啉钠溶液光电催化降解实验表明,BiVO4上的电子e-通过Pt单质转移到TiO2,形成了Z型异质结,从而显著提升了光电催化活性.降解反应中起主要作用的活性物质是,遵循一级反应动力学模型.通过甲基化、羟基化、开环、脱酰胺等反应,头孢唑啉钠( CFZ )最终被矿化为SO42-、NO3-、CO32-、H2O等无毒小分子物质.
- Abstract：The extensive use of antibiotics in new pollutants poses a significant threat to the health of the aquatic environment. In this study, the Z-type heterostructured BiVO4-Pt-TiO2 nanotube electrodes were prepared by photodeposition and hydrothermal methods, and its structure was characterized and electrochemical analysis was carried out, which was applied to the degradation of simulated wastewater of cefazolin sodium. The diameter of TiO2 nanotubes was about 90 nm, and a slight amount of Pt monomers and BiVO4 nanosheets existed on the surface, as shown by SEM and XPS measurements. The results of I-t, EIS and M-S analyses showed that the photocurrent density of the modified nanotubes was increased by 10 times and the electron-hole pair separation efficiency was higher. Photoelectrocatalytic degradation experiments of cefazolin sodium solution were performed with BiVO4-Pt-TiO2 nanotubes as working electrodes. The degradation experiments showed that the electron e- on BiVO4 was transferred to TiO2 via Pt monomers, forming a Z-type heterojunction, which significantly enhanced the photoelectrocatalytic activity. was the active substance that played a main role in the degradation reaction. The degradation reaction followed a one-stage reaction kinetics model. Through processes that involved methylation, hydroxylation, ring opening and deamidation, cefazolin ( CFZ ) was eventually mineralised into small,non-toxic molecules with SO42-、NO3-、CO32-, and H2O.
