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化工进展  2015 

磷酸盐调控纳米TiO2微结构及其表面羟基密度

DOI: 10.16085/j.issn.1000-6613.2015.05.036, PP. 1401-1405

Keywords: 纳米TiO2,磷酸根,金红石,锐钛矿,表面羟基密度

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Abstract:

以冰乙酸作诱导剂,研究磷酸盐在溶胶-凝胶法合成纳米二氧化钛过程中对其微结构及其表面羟基密度的影响,并利用XRD、BET、EDS、SEM、FT-IR和TGA等方法对二氧化钛相变过程和表面结构变化进行表征.结果表明合成过程中添加磷酸根可增加纳米二氧化钛的表面羟基密度,500℃、700℃煅烧6h,其表面羟基密度分别为10.74nm-2、4.03nm-2,而对照样在500℃煅烧条件下其表面羟基密度为4.95nm-2;同时磷酸根的添加,有利于锐钛型晶相结构的热稳定性,锐钛型向金红石转变的相变温度达800℃.这可能是由于PO43-与TiO2晶相生长基元[TiO6]八面体易发生多齿螯合,不利于金红石相形成.

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