氟铜共掺杂TiO2空心微球的制备及可见光催化性能

来源期刊:中国有色金属学报2017年第8期

论文作者:陈赞宇 陈艳波 李强 汪形艳

文章页码:1643 - 1651

关键词:二氧化钛;共掺杂;空心微球;光催化;阳离子蓝溶液

Key words:titanium dioxide; co-doping; hollow microspheres; photocatalysis; cationic blue

摘    要:以钛酸四丁酯为钛源、氢氟酸为氟源、硝酸铜为铜源,乙醇为溶剂,采用蒸汽热法制备氟铜共掺杂的TiO2空心微球,采用SEM、XRD、UV-Vis、BET等对氟铜共掺杂的TiO2空心微球的形貌特征、晶相结构、吸光性能及氟、铜的存在形式进行表征,以阳离子蓝的光催化降解为目标反应,评价其光催化活性。结果表明:氟铜共掺杂的TiO2空心微球主要通过水蒸气产生的气泡为模板获得,氟铜共掺杂增大TiO2的比表面积,其中TiO2以锐钛矿存在,Cu2+进入TiO2晶格中,大部分F以化学吸附态存在于TiO2的表面形成≡Ti—F基团,少量F进入晶格内部。相比纯TiO2空心微球,氟铜共掺杂的TiO2空心微球的光催化活性明显提高,用氙灯模拟可见光,对初始浓度为20 mg/L的阳离子蓝溶液进行光催化降解,30 min后其降解率达到99.8%。

Abstract: F and Cu co-doping TiO2 hollow microspheres were synthesized via steam heat method, using tetrabutyl orthotitanate as Ti source, hydrofluoric acid as F source, cupric nitrate as Cu source and ethanol as solvent. The structure and properties of the resulting samples were characterized by SEM, XRD, UV-Vis, BET and so on. Photocatalytic degradation of cationic blue was used as a probe reaction to evaluate their photocatalytic activity. The results indicate that the F and Cu co-doping TiO2 hollow microspheres are anatase phase structure, Cu2+ enters into the TiO2 lattice, the fluorine atoms mainly distributed on the surface of TiO2, and exist in forms of chemical-adsorption, the F and Cu co-doping TiO2 hollow microspheres are achieved by the template of water vapor bubbles. The F and Cu co-doping TiO2 hollow microspheres increase the specific surface area of TiO2. Compared to pure TiO2 hollow microspheres, the F and Cu co-doping TiO2 hollow microspheres show much higher degradation efficiency under xenon lamp irradiation, and the degradation rate of which can be up to 99.8% during the photodegradation of cationic blue with the initial concentration of 20 mg/L for 30 min.

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