纳米二氧化钛光催化剂形态和活性的研究

Morphology and Activities of Nanometer TiO 2 Photocatalysts

应用微乳液反应法合成水合 Ｔｉ Ｏ２ ，经煅烧获得纳米 Ｔｉ Ｏ２ 粒子．采用 Ｔ Ｅ Ｍ 、 Ｘ Ｒ Ｄ、 Ｂ Ｅ Ｔ 比表面积测试等手段对粒子进行表征．结果表明，经６５０ ℃煅烧后粒子为锐钛矿型，平均晶粒尺寸为２４．６ ｎｍ ，比表面积为５３．８ ｍ ２ ／ｇ，经１０００ ℃煅烧后粒子为金红石型，平均晶粒尺寸为５３．５ ｎｍ ，比表面积为２０．３ ｍ ２ ／ｇ．考察 Ｔｉ Ｏ２ 粒子晶型对光催化降解苯酚溶液活性的影响，结果表明锐钛矿型纳米 Ｔｉ Ｏ２

The precursor of nanometer TiO 2 particles, titanium hydroxides, were synthesized in nonionic water in oil microemulsions. The hydroxide particles were calcined at 650℃ and 1000℃ to form TiO 2 particles. The structure of the particles was characterized by XRD,TEM,BET surface area experiments. It was found that the samples calcined at 650℃ were anatase phase, and the average grain size and BET specific surface area were 24.6 nm and 53.8 m 2/g respectively, and the samples calcined at 1000℃ were rutile phase, and the average grain size and BET specific surface area were 53.5 nm and 20.3 m 2/g respectively. The photocatalytic degradation of phenol in aerated solution with suspensions of the as prepared and commercial titania particles were investigated. The photoactivity of nanometer anatase TiO 2 particles is higher than that of commercial particles and that of rutile particles as well.