以钛酸丁酯为原料,Na_2SnO_3作为添加剂,通过溶胶-凝胶法制备了锐钛矿型TiO_2晶体,用XRD、FT-IR对催化剂进行了表征.红外光谱表明,Na_2SnO_3掺杂使得TiO_2粒子的晶格振动吸收峰向高波数移动6 cm~(-1),并出现明显的宽化.以含TNT废水为降解对象研究了所制备TiO_2的光催化活性.结果显示,所制备的SnO_3~(2-)掺杂TiO_2具有比P25更高的催化活性,10 h后降解率达到了96% (P25,88%).机制分析认为,SnO_3~(2-)在制备过程中通过热分解产生SnO_2,抑制TiO_2粒子在热处理过程中生长,有利于形成更细小的晶体,同时由于Sn~(4+)离子的影响,使微粒表面缺陷和活性比表面积增加,有利于提高光催化活性.
TiO_2 crystal of anatase doped with SnO_3~(2-) was prepared by sol-gel method using Ti(OBu)_4 as raw material and Na_2SnO_3 as dopant. The as-prepared samples were characterized by FT-IR and XRD. FT-IR spectra of the TiO_2 doped with SnO_3~(2-) anion shows a broadened TiO_2 vibration adsorption peak with approximate 6 cm~(-1) shift to higher wave number compared with the undoped samples. Photo-catalytic tests of the degradation of TNT solution show that SnO_3~(2-) doping can increase the photo-catalytic activity of TiO_2, which is higher than that of P25. The degradating ratio of TNT solution reach to 96% (P25,88%) in 10 h. The possible reason is that SnO_3~(2-) may produce SnO_2 during the heating process due to its thermal instability, which will inhibit the growth of TiO_2 grain and improve the photo-catalytic activity.
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