铍、氮共掺杂TiO2的制备及其可见光下光解水制氢性能研究  

Preparation of beryllium-nitrogen-codoped TiO_2 and performance of photocatalytic hydrogen evolution under visible light irradiation

作　　者：潘高峰[1] 李越湘[1] 彭绍琴[1] 吕功煊[2] 李树本[2] 

机构地区：[1]南昌大学化学系,江西南昌330031 [2]中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室,甘肃兰州730000

出　　处：《功能材料》2008年第4期632-635,共4页Journal of Functional Materials

基　　金：国家重点基础研究发展计划(973计划)资助项目(2003CB214503);江西省自然科学基金资助项目(0620047);江西省教育厅基金资助项目([2006]24)

摘　　要：通过煅烧硫酸钛与氨水水解沉淀物制备氮掺杂TiO2(N-TiO2),用浸渍法制备了铍、氮共掺杂TiO2光催化剂(Be-N-TiO2)。通过可见光光还原沉积法载铂,以可见光(λ≥420nm)光催化制氢为探针反应考察了催化剂的活性,发现当煅烧温度为300℃,Be2+的掺杂量为1.5%(原子分数)时,制备的Pt/Be-N-TiO2制H2活性最高。通过XRD、DRS、FT-IR等手段对掺杂催化剂进行了表征,N掺杂可在TiO2中形成O—Ti—N键,使其具有可见光吸收能力;掺入Be2+可以有效的分离光生电子和空穴,减少了两者的复合,同时能够消除由于氮掺杂引入的氧空位,使共掺杂催化剂相对于单一的N-TiO2具有较高的可见光制H2活性。The nitrogen doping TiO2 （N-TiO2） was prepared by the calcinations of hydrolysis product of titanium sulphate with aqueous ammonia. Using the N-TiO2 and BeSO4 solution, Be-N-co-doped TiO2 was prepared by impregnation method. The Pt was deposited on Be-N-TiO2 by photochemical deposition with irradiation of visible light. The activities of Pt/Be-N-TiO2 catalyst under visible light（λ≥420nm）were evaluated by photocatalytic hydrogen production. When calcinated temperature is 300℃ and Be doped amount is 1.5ate,the Pt/Be-N-TiO2 have the highest activity for visible light evolvtion of H2. X-ray diffraction, UV-vis diffuse reflectance spectroscopy,fourier transform infrared spectroscopy were used to characterize the catalyst. The results showed that the Ti-O-N bond formed in the catalyst could extend the absorption edge to the visible light region. Due to Be^2＋ doping,the separation of photoinduced electron-hole pairs can be effectively promoted and the oxygen vacancy produced by nitrogen doping can be removed,and thus the evolved H2 activity is improved compared to N-TiO2.

关 键 词：光催化 铍、氮共掺杂 TiO2 可见光 制氢 

分 类 号：O643[理学—物理化学]