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以钛酸丁酯为钛源,氯化铵为氮源,采用溶胶-凝胶法,不同煅烧温度条件制备N掺杂TiO_2纳米材料,采用X射线粉末衍射(XRD)、傅里叶变换红外(FT-IR)、扫描电镜(SEM)、紫外-可见漫反射(UV-Vis DRS)手段对其进行表征,并通过降解腐殖酸(HA)实验,探讨N-TiO_2可见光催化性能。结果表明,制备的光催化纳米材料为锐钛矿相,TiO_2光响应范围可拓宽到可见光区;煅烧温度是影响可见光催化活性的重要因素,350℃煅烧的N-TiO_2可见光催化活性最佳,光反应140min后,对初始浓度为5 mg/L的HA溶液降解率达80.32%,光催化反应过程符合准一级动力学,煅烧温度过高或过低,动力学反应速率常数呈现不同程度的减小,降解反应速率明显下降。
N-doped TiO_2 nanomaterials were prepared by sol-gel method and calcined at different calcination temperatures using butyl titanate as titanium source and ammonium chloride as nitrogen source. XRD, FT-IR, FT-IR, SEM and UV-Vis DRS. The photocatalytic activity of N-TiO 2 was also investigated by degradation of humic acid (HA). The results show that the prepared photocatalytic nanomaterials are anatase phase, and the range of TiO 2 light response can be broadened to visible light. The calcination temperature is an important factor affecting the visible light catalytic activity. The visible light catalytic activity of N-TiO 2 calcined at 350 ℃ is the best, After 140min reaction, the degradation rate of HA solution with the initial concentration of 5 mg / L was 80.32%. The photocatalytic reaction was in accordance with the quasi-first order kinetics. The calcination temperature was too high or too low, and the kinetic reaction rate constants decreased to some extent Small, degradation reaction rate decreased significantly.