高活性碳氮共掺杂二氧化钛纳米线的制备与应用  

Preparation and Application of Carbon,Nitrogen-Codoped Nanowire with High Reactivity

作　　者：张延霖[1] 吴宏海[1] 蔡文娟[1] 

机构地区：[1]华南师范大学化学与环境学院环境理论化学省部共建教育部重点实验室,广州510006

出　　处：《华南师范大学学报（自然科学版）》2015年第3期39-44,共6页Journal of South China Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(4137050)

摘　　要：一维纳米线(尤其是非金属掺杂的一维纳米线)具有电荷移动速度快和载流子复合率低的特点,其在温和条件下的制备备受关注.以硫酸钛为钛源、异丙醇为保护剂水热法制备了碳掺杂及碳氮共掺杂两种Ti O2纳米线,并进行了XRD、SEM、HRTEM、SAED、XPS、BET和UV-Vis等表征.结果表明,经500℃煅烧得到的碳氮共掺杂Ti O2纳米线含有Ti O2(B)和锐钛矿相,并在600℃时完全转变为锐钛矿相;在可见光激发下,相比于碳氮共掺杂纳米颗粒和碳掺杂纳米线,制备的碳氮共掺杂纳米线对阿特拉津的降解效果更好.原因在于:其一,碳和氮的引入有缩短催化剂价带、有效分离光生电子空穴和增加光生电子等作用;其二,600℃以上煅烧能延长锐钛矿到金红石的转化温度,避免产生催化活性低的金红石相.One-dimensional （1 D） nanowire material （especially nonmetal doped 1 D nanowires） synthesized by a facile way is of great significance and greatly desired as it has high charge carrier mobility and low carrier recombi nation rate. C-doped and C, N-codoped TiO2 nanowires were synthesized using titanium sulfate as a precursor and isopropanol as a protective capping agent by a hydrothermal route. The obtained doped nanowires were characterized by XRD, SEM, HRTEM, SAED, XPS, BET and UV-Vis absorption spectrum. The as-synthesized C,N-codoped TiO2 nanowires calcined at 500 ℃ have TiO2 （B） and anatase phase and then are completely transformed to anatase phase at the calcination temperature of 600 ℃. Photocatalytic activity measurement shows that the C, N-co- doped TiO2 nanowires calcined at 600 ℃ reveals the best photocatalytic performance for the degradation of atrazine under visible light irradiation compared to C, N-eodoped TiO2 nanopartieles and C-doped TiO2 nanowires, which was attributed to （i） the synergistic effect of C and N doping in narrowing the band gap, separating electron-hole pairs and increasing the photoinduced electrons, and （ii） extending the anatase-to-rutile transformation temperature above 600℃.

关 键 词：纳米线 碳氮共掺杂 可见光激发 水热法 

分 类 号：X52[环境科学与工程—环境工程]