摘要
[目的]高效、低成本地治理装修涂料所释放的甲醛是改善室内空气质量的关键和难点.[方法]以次磷酸和缺陷型TiO2 水溶胶为原料,通过湿化学氧化还原法制备了不同磷掺杂量的TiO2.利用X射线衍射(XRD)、氮气物理吸脱附、拉曼光谱、透射电镜(TEM)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱、电化学测量等技术手段对光催化剂的组成、结构和光电化学性质进行表征.根据带隙数据和莫特-肖特基曲线,探讨了磷掺杂TiO2 光催化降解甲醛的机理.[结果]以Ti元素与次磷酸的物质的量比为1∶1所制备的磷掺杂TiO2在紫外光下催化降解甲醛的性能最优,2 h内甲醛的降解率达到90.8%,是未使用催化剂时的45倍和使用未改性TiO2时的4.5倍.由于磷元素的引入,材料的光响应能力增强,比表面积增大,光生载流子的分离和传递加快,光催化性能显著提高.[结论]磷掺杂TiO2材料具有成本低、效率高、易于生产、环境友好等优点,在空气净化方面具有较大的应用潜力.
Abstract
[Introduction]Highly efficient and low-cost treatment of formaldehyde released from decorative coatings is the key and difficulty to improve indoor air quality.[Method]TiO2 doped with different amounts of phosphorus were prepared from defective TiO2 hydrosol and hypophosphorous acid by wet chemical oxidation-reduction method.The composition,structure,and photoelectrochemical properties of the photocatalysts were characterized by X-ray diffraction(XRD),nitrogen adsorption-desorption measurement,Raman spectroscopy,transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),ultraviolet-visible diffuse reflectance spectroscopy,and electrochemical measurement.The mechanism for photocatalytic degradation of formaldehyde by P-doped TiO2 was proposed based on the bandgap data and Mott-Schottky curves.[Result]The P-doped TiO2 prepared at a molar ratio of Ti element to hypophosphorous acid of 1:1 showed the best performance in catalyzing the degradation of formaldehyde under ultraviolet light.The formaldehyde degradation rate of the P-doped TiO2 within 2 hours was 90.8%,which was 45 times that in the absence of photocatalyst and 4.5 times that of the undoped TiO2.Due to the introduction of phosphorus element,the light response capability of TiO2 is enhanced,the specific surface area is increased,the separation and transfer of photogenerated carriers are accelerated,and hence the photocatalytic performance is significantly improved.[Conclusion]P-doped TiO2 has advantages of low cost,high efficiency,easy production,and environmental friendliness,and has great potential for application in air purification.
基金项目
江苏省高等学校基础科学(自然科学)面上研究项目(23KJB430035)
泰州市科技支撑计划社会发展(指导性)项目(31)
泰州市"凤城英才"青年科技人才托举计划项目()
泰州职业技术学院院级一般科研项目(TZYKY-22-13)
2023年江苏高校"青蓝工程"优秀教学团队资助()
NETL
NSTL
万方数据