摘要
以高岭土为载体、双氰胺为g-C_3N_4前驱体,采用液相浸渍联合热聚合工艺制备出一种可见光响应的高岭土基复合光催化材料。采用X射线衍射(XRD)、静态氮吸附仪(BET)、场发射扫描电镜(FESEM)、紫外-可见吸收光谱(UV-Vis)等手段对复合材料的晶相、孔结构、界面特性和光学性能进行了表征,并以罗丹明B作为目标污染物考察了不同催化剂的可见光光催化活性。结果表明,当高岭土和双氰胺的质量配比为2∶4,即g-C_3N_4的实际负载量为38.82%时,所制备的g-C_3N_4/高岭土复合材料光催化性较优,其光催化速率是纯g-C_3N_4的4.18倍;高岭石与g-C_3N_4紧密结合,该复合结构能够有效地抑制光生载流子的复合,改善纯g-C_3N_4材料的吸附性能与光催化活性。
Using purified kaolinite as carrier and dicyandiamide as g-C3N4precursor,a novel visible light respon-ding g-C3N4/kaolinite composite photocatalytic material was prepared through chemical impregnation combined with thermal polymerization method.The crystalline phase-pore structure?interface and optical properties of the obtained composites were characterized by X-ray diffraction(XRD),N2adsorption-desorption analysis(BET),field emission scanning electron microscope(FESEM)and UV-visible diffused reflectance spectroscopy(UV-Vis),respectively.Using rhodamine B(RhB)as the target pollutant,the visible-light photocatalytic ac-tivity of different photocatalyst was investigated.It indicated that when the mass ratio of kaolinite and dicyandi-amide is2:4,the as-synthesized CN/KA-4sample(g-C3N4content38.82%)significantly exhibited better pho-tocatalytic activity under visible-light irradiation,whose reaction constant rate is almost4.18times that of the pure g-CsN.i.The g-CsN.^nanosheets were firmly attached on the surface of kaolinite?which could effectively in-hibit the recombination of photogenerated carriers and further improve the adsorption capacity and photoactivity of g-C3N4photocatalyst.
作者
孙志明
李雪
马瑞欣
李春全
郑水林
SUN Zhiming;LI Xue;MA Ruixi;LI Chunquan;ZHENG Shuilin(School of Chemical and Environmental Engineering,China University of Mining andT echnology,Beijing100083,China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2017年第8期18-23,共6页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51504263)
中央高校基本科研业务费资助项目(2015QH01)
