以钛酸四丁酯、硫脲和硼酸为原料,采用溶胶-水热法制备了 B-S-TiO2光催化剂.通过 TG-DTA、XRD、FT-IR、UV-Vis、PL等手段对样品进行表征和分析,研究了不同热处理温度对共掺杂B-S-TiO2光催化剂晶体特性的影响.以亚甲基蓝(MB)作为目标降解物,研究了不同热处理温度下系列样品在可见光激发下的光催化性能.结果表明,B和S的共掺可以抑制样品由锐钛矿相向金红石相的转变,限制晶粒的生长,拓宽 TiO2的光谱响应范围至可见光区,减小了光生电子-空穴对的复合几率.当n(B)∶n(TiO2)＝1∶25,n(S)∶n(TiO2)＝1∶50,热处理温度为450℃时,B-S-TiO2样品在发光范围为可见光的普通日光灯下5 h 内对亚甲基蓝的降解率达92．52％,显著高于同等实验条件下P25的降解率(60．74％).
B-S-TiO2 photocatalysts were synthesized by sol-hydrothermal method using tetrabutyl titanate,thio-urea and boric acid as precursors and characterized by TG-DTA,XRD,FT-IR,UV-Vis and PL methods.The influences of different heat treated temperatures on properties were studied.The photocatalytic activity of B-S-TiO2 photocatalysts was investigated by measuring the degradation rate of methylene-blue (MB)under visible light irradiation.The results show that B,S codoping can not only inhabit the phase transition of anatase to ru-tile,restrain the growth of the grain but also broaden the absorption region to visible light and inhibit the re-combination of the photo-generated electrons and holes.The photocatalytic activity of the sample with molar ra-tio of n(B)∶n(TiO2 )=1∶25,n(S)∶n(TiO2 )=1∶50 and calcinated temperature of 450 ℃ was the best un-der the irradiation of fluorescent light,it was 92.52% within 5 hours and significantly higher than that of De-gussa P25(60.74%)under the same experimental conditions.
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