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介孔so42-/tio2的一步法制备及其光催化性能

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Abstract:

?通过对tioso4溶液热水解用一步法制备出大比表面积、高活性的介孔so42-/tio2光催化剂.用低温氮吸附-脱附等温线、xrd、hammett指示剂、艾氏卡等方法对so42-/tio2催化剂进行了表征,以亚甲基蓝的光催化氧化降解反应考察了催化剂的光催化性能.结果表明,在焙烧过程中硫酸根和偏钛酸孔壁上的自由羟基键合,不仅有效地抑制了tio2晶粒的长大和晶相转变,而且起到了孔结构形成的导向及支撑作用,使tio2保持了介孔结构、较高的比表面积和锐钛矿相,同时s=o键的强电子诱导效应还使邻近的ti成为超强酸中心,促进了tio2光生电子-空穴对的分离,延长了电子-空穴对的寿命,从而有效地提高了tio2的光催化活性.

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