摘要
为了更好的利用太阳能,以钛酸正丁酯为前驱体,硝酸铵和钨酸铵为掺杂离子给体,通过溶胶-凝胶法,室温下成功制备了纯TiO2和钨、氮掺杂和共掺杂的TiO2光催化剂。表征结果显示,共掺杂催化剂为锐钛矿型,外观呈球形,感光范围拓展到可见光区域。以甲基橙为降解物,氙灯为模拟太阳光光源,进行光催化降解实验,钨、氮共掺杂TiO2在光照120min后,对甲基橙溶液的降解率达到了92%以上。降解结果显示,共掺杂的催化剂活性高于单掺杂和未掺杂催化剂。共掺杂TiO2具有较高的光催化活性,其原因可能是氮掺杂降低了TiO2的禁带宽度,钨掺杂能有效的抑制电子和空穴复合。
TiO2 photocatalysis technology was applied to photodegradation of organic contaminants by utilizing solar energy effectively.Pure and doped or co-doped TiO2 catalysts with tungsten and nitrogen were obtained by a sol-gel process,in which tetrabutyl titanate was used as precursor and ammonium tungstate,ammonium nitrate as ion donors.The prepared photocatalysts were found to be of anatase phase,spherical appearance,and visible response by means of XRD,FE-SEM and UV-vis spectra analysis.The co-doped TiO2 catalysts showed higher photocatalytic activity in degradation of methyl orange under Xe lamp than that of pure and single doped ones.The degradation rate of methyl orange is more than 92% after a light exposure for 120 min.The higher photocatalytic activity of co-doped TiO2 was attributed to the doped nitrogen and tungsten.Nitrogen decreased the band gap.Tungsten effectly inhabited the recombination of electrons and holes.
出处
《化工科技》
CAS
2011年第6期15-18,22,共5页
Science & Technology in Chemical Industry
基金
辽宁省教育厅高等学校科研项目(2009S080)
关键词
光催化
TIO2
掺杂
甲基橙
Photocatalsis
TiO2
Co-doped
Methyl orange
