Synthesis experiment design and practice of modified silica/pp composites and their effects on properties
二氧化钛光催化剂的改性及其对亚甲基蓝的降解性能研究

摘要

随着环境污染的问题越来越来严重，光催化技术利用其绿色高效无污染的特点，成为了环境治理方面的研究热点。本研究通过铁掺杂以及聚乙二醇（PEG）表面修饰的方法对二氧化钛（TiO₂）进行改性，采用溶胶-凝胶法成功制备了光催化剂。随后，利用傅里叶变换红外光谱（FTIR）和紫外-可见漫反射光谱（UV-Vis DRS）等技术对其结构与光学性能进行了表征分析，并以亚甲基蓝作为目标污染物，在常温常压条件下对其降解性能进行了检验。结果表明，铁掺杂有效减小TiO2禁带宽度，PEG表面修饰增强了光催化剂的分散性，二者共同作用使光生载流子复合率显著降低。改性后的TiO2光催化剂在常温常压下对亚甲基蓝展现出优异的降解性能，为高效光催化材料的开发提供了新思路。

Abstract

With the increasingly severe environmental pollution, photocatalysis technology has become a research hotspot in environmental governance due to its green, efficient, and pollution-free characteristics. In this study, TiO₂ was modified through iron doping and polyethylene glycol (PEG) surface modification. We successfully prepared the photocatalyst via the sol-gel method. Subsequently, Fourier transform infrared spectroscopy (FTIR) and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) were used to characterize their structural and optical properties. The degradation performance was evaluated using methylene blue as the target pollutant under normal temperature and pressure conditions. The results show that iron doping effectively reduces the bandgap of TiO₂, while PEG modification enhances the dispersibility of the photocatalyst. The combined effect significantly reduces the recombination rate of photogenerated carriers. The modified TiO₂ photocatalyst demonstrates excellent degradation performance toward methylene blue under normal temperature and pressure, providing new insights for the development of high-efficiency photocatalytic materials.