Co/N/S共掺杂纳米TiO_2的制备及其可见光催化活性  

On the preparation of cobalt,nitrogen and sulfur co-doped nano-TiO_2 and its visible light catalytic activity

作　　者：赵鑫[1] 翟永佳 林朝阳[1] 尹妮[1] 

机构地区：[1]苏州科技大学化学生物与材料工程学院江苏省环境功能材料重点实验室,江苏苏州215009

出　　处：《安全与环境学报》2015年第4期268-272,共5页Journal of Safety and Environment

基　　金：住建部科研基金项目(2008-K7-29)

摘　　要：为提高纳米Ti O2的可见光催化活性,采用溶胶-凝胶法制备了一种掺杂型纳米可见光催化剂Co/N/S/Ti O2,并用正交试验法对其制备工艺进行了优化;用紫外-可见漫反射光谱（DRS）、X射线衍射（XRD）、透射电子显微镜（TEM）等方法对其吸光性能和结构进行了表征;以活性艳蓝X-BR溶液为光降解模型,对其可见光催化活性进行了评价,并与Degussa P25进行对比。结果表明,在Co∶N∶S∶Ti物质的量比为0.15∶0.2∶0.2∶1、煅烧温度为400℃、煅烧时间为1h的最佳制备条件下,所制得的Co/N/S/Ti O2光催化剂为单一锐钛矿晶相,平均粒径为8~10 nm,比表面积约为192.19 m2/g。Co/N/S/Ti O2光催化剂吸收边可红移至近900 nm,可见光催化活性突出,在纯粹可见光（λ〉400 nm）下光解活性艳蓝X-BR溶液120 min的降解率可达91.5%,与Degussa P25相比,其可见光催化活性提高了80.1%,且重复使用性能良好。The given paper intends to introduce its experimental results on the preparation of cobalt,nitrogen and sulfur co-doped nano-Ti O2 and ways to improve its visible light catalytic activity,a novel nano-particle photocatalyst prepared with the method of sol-gel. Actually,the orthogonal experiment we have done has helped to optimize the preparing technology of the said nanoTi O2. In preparing for our experiment,we have investigated the photocatalytic activities of the nanoparticle photocatalyst Co / N / S /Ti O2 by degrading the brilliant reactive blue X-BR solution and analyzed the optical absorption features of the crystallite structure and the micromorphology of the nanoparticle photocatalyst Co / N /S / Ti O2 by means of UV-Vis diffusion reflectance spectroscopy（ DRS）,the X-ray diffraction（ XRD） and transmission electronic microscopy（ TEM）. The experimental results indicate that the nano-particle photocatalyst Co / N / S / Ti O2 under study can be prepared in a desired manner under the condition of annealing temperature at 400 ℃ for one hour and keeping the mol ratio at a proportion of Co： N： S： Ti being 0. 15： 0. 2： 0. 2： 1. And it possesses the single anatase phase. The other results we have gained include： its particle size is about 8-10 nm with its specific surface area being about 192. 19 m2/ g. Furthermore,the aforementioned method can also contribute to the effective restraining of the nano-Ti O2 phase transition from anatase to rutile. In addition,it can also influence the controlling growth of the crystal particles. What is more,since the absorption edge of the said Co / N /S / Ti O2 tends to shift noticeably toward the longer wavelength close to 900 nm,its optical absorption intensity can be significantly enhanced in the ultraviolet and visible light area,for which the said Co / N / S / Ti O2 tends to display much stronger visible light of the photocatalytic activity due to the corporative actions of the three kinds of elements Co,N and S. Besides,the photocatalytic decompos

关 键 词：环境科学技术基础学科 光催化 共掺杂纳米TiO2 可见光 

分 类 号：X13[环境科学与工程—环境科学] O643[理学—物理化学]