【摘要】 以钛酸丁酯和硝酸镧为原料,采用溶胶-凝胶法制备了纯的和La掺杂活性炭负载TiO2催化剂,用XRD、UV-V is漫反射光谱和扫描电镜等测试技术对该催化剂的晶型和形貌进行了表征,并考察了La含量和焙烧温度对TiO2/AC催化剂的性质及光催化分解亚甲基蓝活性的影响。结果表明,La掺杂不仅抑制了TiO2由锐钛矿相向金红石相的转变,而且使TiO2的光响应范围向可见光区拓展。当掺杂摩尔分数为0.30%的La,可见光照射120 m in时,La-TiO2/AC催化剂的光催化分解率可达87%。更多还原

【Abstract】 The pure and La-doped TiO₂/AC catalysts were prepared on the surface of active carbon（AC） via the sol-gel method with tetrabutylorthotitanat and lanthanum nitrate as source materials.The crystalline（structures） and morphologies were characterized by means of XRD,UV-Vis and SEM.The effects of calcining temperature and La content on the properties and the photocatalytic activity of TiO₂/AC catalysts for the degradation of methylene blue have been carefully investigated.The results show that La dopant not only greatly（inhibits） TiO₂ crystal phase transformation from anatase to rutile,but also makes the optic response range of TiO₂ particle expand to visible light.It was found that the degradation rate of methylene blue reached 87% when the molar fraction of La in TiO₂ was 0.30% and the irradiation time was 120 min.更多还原