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中文摘要：
采用溶剂热法合成了可见光响应的TiO2／g-C3N4复合光催化剂，并对TiO2／g—C3N4进行质子化处理。通过X射线衍射（XRD）、氮气吸附-脱附BET法、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶红外光谱（FT—IR）、紫外-可见漫反射（UV—vis DRS）和荧光光谱（PL）等方法对样品进行了表征，并以甲基橙（MO）光催化降解为模型反应，考察了可见光下制备的样品的光催化性能。结果表明，多孔TiO2纳米晶与g—C3N4形成具有“芝麻饼”形貌的复合结构；TiO2／g—C3N4复合光催化剂的光吸收带边扩展到465nm，较TiO2出现明显红移；TiO2与g—C3N4能带匹配耦合，有效地抑制了电子与空穴的复合；质子化处理过程能够提高可见光区吸收强度和电子的传导能力，增强了TiO2的光催化活性。
英文摘要：
TiO2/g-CaN4 composite photocatalyst with visible-light response was synthesized by the solvothermal method, and then the as-synthesized photocatalyst was protonated. The samples were characterized by X-ray diffraction（XRD）, nitrogen absorption-desorption, scanning electron microscope（SEM）, transmission electron microsope（TEM）, Fourier transform infrared spectrometer （FT-IR）, UV-vis diffuse reflect spectroscope （UV-vis DRS） and photoluminescence spectra （PL）. The photocatalytic performance of the TiO2/g-CaN4 was evaluated by the degradation of methylene orange （MO） under the visible light. The results show that porous Ti（）2 nanocrystalline and g-C_~ N~ are able to form ＂sesame cake＂ composite structure. The absorption edge of TiO2 / g-CaN4 photocatalyst expands to 465 nm, which appears remarkable red shift compared with TiOz. The coupling of TiO2 and g-C3N4 with suitably matching band level of conduction and valance bands provides TiO2/g-C3N4 photocatalyst with the driving forces to separate and transfer photogenerated electron-hole pairs. The protonation process can improve the absorption of visible light, increase electronic transfer ability and enhance the TiO2/g-C3N4 photocatalyst activity.
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