采用改进的Sol-gel法制备了S-TiO_2和TiO_2,用1 mol·L~(-1)的H_2SO_4对TiO_2进行表面修饰制成的SO_4~(2-)/TiO_2.采用XRD、IR、UV-Vis、SEM和EDS等技术对催化剂的结构进行了表征,以L酸(1-萘酚-5-磺酸)为目标物,考察了所制备的催化剂的性能.结果表明:S-TiO_2的禁带宽度明显降低,并且对400～650 nm区域的可见光都有一定的吸收,其可见光活性和紫外光活性均高于SO_4~(2-)/TiO_2和纯TiO_2.%The S-TiO_2 and TiO_2 were prepared by the improved sol-gel method, the SO_4~(2-)TiO_2 was prepared by SEM, EDS and the photocatalytic activities were evaluated by photodegradation of L-acid(1-naphthol-5-sulfonic acid) under ultraviolet and visible light radiation. The results showed that the band gap of S-TiO_2 was reduced obviously, the visible light absorption was extended to 400～650 nm, and the photocatalytic activities were higher than both SO_4~(2-)/TiO_2 and pure TiO_2 under either ultraviolet radiation or visible light radiation.
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