Facile Photochemical Synthesis of Au/Pt/g-C3N4 with Plasmon-Enhanced Photocatalytic Activity for Antibiotic Degradation
Facile Photochemical Synthesis of Au/Pt/g-C3N4 with Plasmon-Enhanced Photocatalytic Activity for Antibiotic Degradation
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DOI：
10.1021/acsami.5b01212
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发表时间：
2015-05-13
影响因子：
9.5
通讯作者：
He, Man
中科院分区：
文献类型：
--
作者：
Xue, Jinjuan;Ma, Shuaishuai;He, Man
采用快速煅烧-光沉积技术制备了新型等离子体光催化剂Au/Pt/g-C3N4。通过x射线衍射、能谱、透射电子显微镜和紫外-可见漫反射光谱对样品进行了表征，结果表明，Au和Pt纳米颗粒（7 ~ 15 nm）在g-C3N4表面分布良好。Au/Pt共修饰的g-C3N4异质结构对抗生素盐酸四环素（TC-HCl）的降解表现出增强的光催化活性，在可见光照射下的降解率是纯g-C3N4的3.4倍。光催化活性的增强可归因于Au的表面等离子体共振效应和Pt纳米粒子的电子汇功能，它们改善了g-C3N4的光学吸收性能和光生载流子的分离，协同促进了光催化过程。最后，初步提出了Au/Pt/g-C3N4异质结构光催化降解TC-HCl的可能机理。
A novel plasmonic photocatalyst, Au/Pt/g-C3N4, was prepared by a facile calcination-photodeposition technique. The samples were characterized by X-ray diffraction, energy-dispersive spectroscopy, transmission electron microscopy, and UV-vis diffuse reflectance spectroscopy, and the results demonstrated that the Au and Pt nanoparticles (7-15 nm) were well-dispersed on the surfaces of g-C3N4. The Au/Pt codecorated g-C3N4 heterostructure displayed enhanced photocatalytic activity for antibiotic tetracycline hydrochloride (TC-HCl) degradation, and the degradation rate was 3.4 times higher than that of pure g-C3N4 under visible light irradiation. The enhancement of photocatalytic activity could be attributed to the surface plasmon resonance effect of Au and electron-sink function of Pt nanoparticles, which improve the optical absorption property and photogenerated charge carriers separation of g-C3N4, synergistically facilitating the photocatalysis process. Finally, a possible photocatalytic mechanism for degrading TC-HCl by Au/Pt/g-C3N4 heterostructure was tentatively proposed.