g-C_3N_4/TiO_2可见光催化降解磺胺二甲基嘧啶的研究  

Photocatalytic Degradation of Sulfamethazine by Using Synthesized g-C_3N_4/TiO_2 under Visible Light

作　　者：李余杰 朱翔 张智[1] 卢鹏 蔡松柏[2] 李俊辉 彭竹葳 魏婷[1] 

机构地区：[1]重庆大学城市建设与环境工程学院,重庆400045 [2]中国市政工程西南设计研究院,成都610000

出　　处：《人工晶体学报》2017年第11期2190-2196,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51108481);国家水体污染控制与治理科技重大专项(2012ZX07102001-003);重庆市研究生科研创新项目(CYB15039);中央高校基本科研业务费(CDJRC11210002;106112012CDJZR210027);污染控制与资源化国家重点实验室开放课题(PCRRF12021)

摘　　要：以商用TiO_2颗粒和三聚氰胺为原料,采用高温煅烧法制备g-C_3N_4/TiO_2复合光催化材料。利用X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)、低温氮气物理吸附和紫外-可见漫反射光谱仪(UV-vis)对g-C_3N_4/TiO_2的进行表征,并研究在可见光条件下g-C_3N_4/TiO_2对溶液中磺胺二甲基嘧啶(Sulfamethazine,SMT)的光催化降解效果。结果表明:TiO_2颗粒附着在层状结构g-C_3N_4/表面,形成具有孔隙结构和更大比表面积的g-C_3N_4/TiO_2,有利于污染物的吸附。g-C_3N_4/TiO_2的光吸收带边移动到430 nm,具有可见光响应。在可见光照射下,当g-C_3N_4/TiO_2投加量为0.2 g/L时,初始浓度为0.5 mg/L的SMT在3 h内去除率可达98.8%。在相同条件下,g-C_3N_4和TiO_2只能分别去除57.8%和9.7%的SMT。活性物质掩蔽实验表明g-C_3N_4/TiO_2光催化降解SMT过程中,超氧自由基(·O2-)和光生空穴(h+)在降解SMT时起主要作用。Graphitic carbon nitride/titanium dioxide （ g-C3N4/T i0 2 ） hybrid photocatalysts were synthesized by heating mixtures of commercial Ti02 particles and melamine. The g-C3N4/Ti02 samples were characterized by X-ray diffraction （ XRD） , scanning electron microscopy （ SEM） , transmission electron microscopy （ TEM） , low temperature nitrogen adsorption and UV-visible diffused reflectance spectroscopy （ UV-vis DRS） . The photocatalytic degradation of sulfamethazine （ SMT） was investigated by using g-C3N4/Ti02 under visible light. The results show that Ti02 is distribute on layered structure of g-C3N4, and form g-C3N4/Ti02 with pore structure and larger specific surface areas. The g-C3N4/Ti02 has visible light response with absorption edge of 430 nm. When the dosage of g-C3N4/Ti02 is 0.2g/L, about 98. 8% of SMT in solution is removed in 3 h with an initial concentration of 0. 5 mg/L under visiblelight, much higher than g-C3N4 （57. 8% ） and Ti02 （9. 7% ） . The results of active species trapping experiments reveal that the holes （ h ＋ ） and superoxide radical （ 〇2 ） make a major contribution in photocatalytic degradation of SMT by g-C3N4/Ti02.

关 键 词：g-C3N4/TiO2 磺胺二甲基嘧啶 可见光 光催化降解 

分 类 号：O643.3[理学—物理化学]