孔道结构H3PW12O40/TiO2的制备及其可见光光催化降解水溶性染料的性能

 采用溶胶-凝胶方法制备了孔道结构复合材料H3PW12O40/TiO2,采用ICP-AES,UV/DRS,31P MAS NMR,TEM和N2吸附等技术对其组成和结构进行了表征. 结果表明,催化剂中活性组分H3PW12O40的基本骨架结构未发生改变,H3PW12O40的担载量为22.29%,催化剂平均粒径为40 nm,具有双孔结构,其平均微孔和介孔孔径分别为0.61和3.06 nm. 考察了催化剂可见光光催化降解6种水溶性染料的性能. 结果表明,6种染料均可不同程度地被降解和矿化. 通过对染料中性红的光催化降解实验,比较了H3PW12O40/TiO2,Degussa P-25和锐钛矿结构TiO2的可见光光催化活性,其中,H3PW12O40/TiO2活性最高,且催化剂最易分离,可循环使用.

Preparation of Porous H3PW12O40/TiO2 and Its Photocatalytic Activity for Degradation of Aqueous Dyes under Visible-Light

Porous titania supported Keggin unit, H 3PW 12 O 40 /TiO 2, was prepared by sol-gel method, and it was characterized by UV/DRS, ICP-AES, 31 P MAS NMR, TEM and nitrogen adsorption/desorption techniques. The results indicated that the Keggin structure was intact in H 3PW 12 O 40 /TiO 2 catalyst, and the loading of H 3PW 12 O 40 was 22.29%, the average micropore and mesopore diameter of H 3PW 12 O 40 /TiO 2 was 0.61 and 3.06 nm, respectively, and the particle size was ca. 40 nm. H 3PW 12 O 40 /TiO 2 was active to decompose six aqueous dyes, and its photocatalytic activity was higher than that of P-25 and TiO 2 (anatase). Meanwhile, it is easy to separate and recover H 3PW 12 O 40 /TiO 2 from the reaction system.