N、Mn共掺杂TiO_2的制备、表征及光催化性能研究

应用溶胶凝胶法,以尿素、氯化锰和钛酸丁酯为原料制备了纯Ti O2、N掺杂、Mn掺杂及N、Mn共掺杂的Ti O2纳米粉体。采用XRD、SEM、EDS、UV-VIS等分析手段对样品的物相、形貌、成分和吸光性能进行了表征,并且以亚甲基蓝溶液为模拟污染物在阳光下进行了光催化实验。结果表明,样品主要为锐钛矿相二氧化钛及少量的金红石型二氧化钛;样品呈颗粒状,有一定程度的团聚;N掺杂、Mn掺杂及N、Mn共掺杂样品的吸收光谱分别红移至470、440、490 nm;光催化实验表明,在可见光照射下的光催化能力由强到弱依次为N、Mn共掺杂N掺杂Mn掺杂纯Ti O2。

Study on preparation,characterization and photocatalytic properties of N,Mn doped TiO2

The nanometer TiO2 powders with nitrogen doping,manganese doping and nitrogen/manganess co-doping as well as undoped TiO2 were prepared by sol-gel methods using urea.MnCl,and tetrabutyl-titanate as raw materials.The crystal,morphology,composition and spectral absorption properties of the powder were characterized by XRD,SEM,EDS and UV-Vis etc.And photocatalytic experiments were carried out under sunlight with methylene-blue solution as simulated pollutant.The results showed that the samples are mainly anatase titanium dioxide with a small amount of rutile-type titanium dioxide.The samples were made of granulas and agglomeration occurred on the doped ones.In addition the red shifts were found on the doped samples in the UV-Vis spectra and N-doped,Mn-doped and N/Mn-codoped samples shifted to 470,440,490 nm.respectively photocatalytic experimental results showed that the photocatalytic capacity order of the samples is：N/Mn-codoped TiO2N-doped TiO2Mn-doped TiO2pure TiO2 under the sunlight.