锐钛矿型TiO₂纳米颗粒的水热法合成及其特性

来源期刊：钢铁钒钛2011年第2期

论文作者：傅小明 徐艳 杨在志 刘照文

文章页码：1 - 4

关键词：纳米TiO₂； 水热法； 硫酸钛； 氨水； 蓝移

Key words：nano TiO₂； hydrothermal method； Ti(SO₄)₂； ammonia liquor； blue shift

摘    要：以硫酸钛为钛源,浓氨水为沉淀剂,通过水热法水解合成TiO₂。利用XRD、SEM和TEM对试样进行分析,结果表明:当硫酸钛溶液水解时不加入浓氨水,随着水解时间的延长,获得的锐钛矿型TiO₂颗粒的粒径没有明显的变化;当硫酸钛溶液水解时加入浓氨水,合成锐钛矿型TiO₂颗粒的粒径明显变小,在240℃、48.0h和pH=9.0条件下水热法合成了方形或者近椭圆形的TiO₂,分散性较好,其颗粒粒径约为20nm。对不同条件下水热法合成的TiO₂进行UV-VIS分析,其锐钛矿型TiO₂颗粒粒径的变小有利于TiO₂吸收峰的蓝移。

Abstract: Anatase TiO2 nanoparticles are synthesized with Ti(SO₄)₂ as titanium source and stronger ammonia water as precipitant using the hydrothernal method.The samples are characterized by XRD,SEM and TEM.The results showed that the change of size of anatase TiO₂ particles is not obvious with increase of the reaction time when stronger ammonia water is not joined Ti(SO₄)₂ solution.Anatase TiO₂ particles become small markedly under the same conditions when stronger ammonia water is joined Ti(SO₄)₂ solution.Anatase TiO₂ particles of about 20 nm are obtained with pH=9.0 at 240℃for 48.0 h by the hydrothernal method.The samples are characterized with UV-VIS.The decrease of TiO₂ particles is propitious to the blue shift of the absorption peak of TiO₂.