【摘要】 采用柠檬酸酸催化溶胶-凝胶法合成了N掺杂介孔TiO₂,并用XRD、HRTEM、XPS、BET、UV-vis等手段表征了N-TiO₂。测试结果表明,煅烧前的样品是无定形TiO₂,低温煅烧后的产物是锐钛矿TiO₂,而750℃煅烧产物是金红石型。少量N元素的掺杂致使TiO₂的吸收带边位置发生少许红移,移向可见光区域。N₂吸附-脱附和光解甲基橙结果显示,N掺杂介孔TiO₂（3.0 at.%）的BET面积为102 m²/g,孔尺寸大小约为9.8 nm,具有比P25更强的光催化降解甲基橙的能力。更多还原

【Abstract】 N-doped mesoporous TiO₂ was prepared via a facile sol-gel route catalyzed by citric acid,and N-TiO₂ was characterized using powder X-ray diffraction（XRD）,High-resolution transmission electron microscope（HRTEM）,X-ray photoelectron spectrum（XPS）,N₂ adsorption（BET）,UV-xis diffused reflectance spectra（UV-vis）.The results revealed that uncalcined N-TiO₂ was amorphous,and the products calcined under lower temperatures were anatase,while the one annealed at 750℃was rutile The doping of a little N element resulted in a red shift of the absorption edge,shifting to the visible light region of mesoporous TiO₂.N₂ adsorption isotherm showed that the BET surface area and the average pore size of N-doped TiO₂ were about 102 m²/g and 9.8 nm,respectively.Compared with P25 TiO₂,N-doped mesoporous TiO₂ exhibited improved photocatalysis activities for photodegradation of methyl orange.更多还原