撞击流-旋转填料床一步法制备氮掺杂二氧化钛的研究

One step preparation of nitrogen doped titanium dioxide by impinging stream-rotating packed bed

以尿素为氮源、硫酸氧钛为钛源、氨水为沉淀剂,采用撞击流-旋转填料床一步法成功地制备了N掺杂TiO_(2)纳米粒子。利用SEM、TEM、UV-Vis、TG-DSC等对催化剂的形貌和性能进行了表征。结果表明,N掺杂TiO_(2)纳米粒子形貌为球形,粒径分布均匀,粒子大小为13 nm;EDS图谱中检测到了N元素,表明N均匀掺杂到TiO_(2)中;与纯TiO_(2)相比,N掺杂TiO_(2)禁带宽度明显降低。以苯酚为目标污染物,考察了N/Ti摩尔比、催化剂质量浓度、溶液pH等因素对苯酚去除率的影响,与纯TiO_(2)相比,改性催化剂去除率提高了40%。

Nitrogen doped TiO_(2)nanoparticles are successfully prepared by impinging stream-rotating packed bed method using urea as the nitrogen source,titanium oxysulfate as the titanium source and ammonia as the precipitant.The morphology and properties of the catalyst are characterized by SEM,TEM,UV-Vis and TG-DSC.It is shown that N-doped TiO_(2)nanoparticles exhibit spherical morphology with uniform particle size distribution,and the particle size is 13 nm.Nitrogen element is detected in EDS,indicating that nitrogen is uniformly doped into TiO_(2).Compared with pure TiO_(2),the band gap of N-doped TiO_(2)is significantly reduced.Taking phenol as the target pollutant,the impacts of N/Ti ratio,catalyst dosage and pH value of solution on phenol removal rate by N-doped TiO_(2)are studied.The removal rate of phenol by modified catalyst is 40%higher than that by pure TiO_(2).