摘要
以水洗高岭土为载体,采用盐酸对g-C_3N_4进行质子化处理,通过浸渍法制备了g-C_3N_4/高岭土复合光催化材料。采用X射线衍射(XRD)、场发射扫描电镜(FESEM)和紫外–可见吸收光谱(UV-Vis)等手段对复合材料的晶体结构、微观形貌和光学性能进行了表征,并以罗丹明B为目标降解物,研究了复合材料在可见光下的光催化性能。结果表明:当高岭土和g-C_3N_4的质量配比为6︰3时,g-C_3N_4/高岭土具有较优的光催化性能,其光催化速率是纯g-C_3N_4的8.62倍;高岭土和g-C_3N_4通过静电吸引力紧密结合在一起,该复合结构能够有效地降低光生电子和空穴的复合几率,改善了纯g-C_3N_4光催化材料的吸附性能,进而有效提高了其光催化性能。
g-C3N4/kaolinite composite photocatalysts were prepared via impregnation method. The microstructure, optical and interface properties of the obtained composites were characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM） and UV-visible diffused reflectance spectroscope （UV-Vis DRS）, respectively. The as-synthesized KA/g-C3N4（H^＋）-6 ： 3 sample exhibits significantly enhanced photocatalytic activity under visible-light irradiation towards degradation of rhodamine B, which is 8.62 times that of the pure g-C3N4. The g-C3N4 and kaolinite are firmly combined together via electrostatic force. The enhanced photocatalytic activity of the g-C3N4/ kaolinite composite is attributed to the improved adsorption capacity and the synergistic effect of the g-C3N4 and kaolinite, which restrains the recombination of electron-hole pairs.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2016年第9期929-934,共6页
Journal of Inorganic Materials
基金
国家自然科学基金(51504263)~~
关键词
高岭土
g-C3N4
可见光光催化
浸渍法
kaolinite
g-C3N4
visible-light photocatalysis
impregnation method
