摘要
以TiCl_3为TiO_2钛源,二聚氰胺为g-C_3N_4前驱体,制备了g-C_3N_4/TiO_2复合材料;通过透射电子显微镜(TEM)、X射线衍射(XRD)和紫外可见光吸收光谱(UV-vis)等对g-C_3N_4/TiO_2复合材料进行形貌、元素和催化活性的表征.结果表明,TiO_2能很好地依附在g-C_3N_4的表面;吸收光发生了红移,扩大了TiO_2的吸收光谱范围;催化剂活性实验研究表明g-C_3N_4与TiO_2按1:9的质量掺杂比例制备出的g-C_3N_4-10/TiO_2复合材料对布洛芬(IBU)的光催化降解效果最好;实验同时研究了g-C_3N_4-10/TiO_2复合材料对IBU光催化降解的影响机制.IBU的光催化反应符合准一级动力学规律;酸性环境下有利于IBU的降解;使用异丙醇作为·OH分子探针,检测到·OH存在于g-C_3N_4/TiO_2光催化体系中,并计算得出·OH的贡献率为73.7%,表明·OH在降解中起到主要作用.
In this experiment,titanium trichloride was chosen as the titanium source of TiO2and dicyandiamide wasselected as the precursor of g-C3N4to prepare the g-C3N4/TiO2composites.The morphology,elements,and catalyticproperties characterization of g-C3N4/TiO2were characterized by transmission electron microscope(TEM),X-raydiffraction(XRD)and ultraviolet-visible absorption spectrum(UV-vis).The results showed that TiO2could be attached onthe surface of g-C3N4well.The doping ratio1:9of C3N4and TiO2showed the highest photocatalytic activity on thedegradation of IBU due to the red-shift of the catalyst.The photocatalytic degradation of IBU followed pseudo-first-orderkinetics.Acidity increased the photocatalytic degradation of IBU.The quenching experiment demonstrated that thecontribution rate of·OH was73.7%,indicating that·OH played a major role in the photocatalytic degradation of IBU.
作者
苏海英
王盈霏
王枫亮
苏跃涵
蔡宗苇
刘国光
吕文英
姚琨
李富华
陈平
SU Hai-ying;WANG Ying-fei;WANG Feng-liang;SU Yue-han;CAI Zong-wei;LIU Guo-guang;Lü Wen-ying;YAO Kun;LI Fu-hua;CHEN Ping(School of Environmental Science and Engineering, Guangdong University of Technology,Guangzhou 510006, China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2017年第1期195-202,共8页
China Environmental Science
基金
国家自然科学基金资助项目(21377031)
广东省科技项目(2013B020800009)
