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利用水热处理结合焙烧的方法分别制备了Zr、Al掺杂及Zr–Al共掺的ZnO光催化剂。研究了制备的光催化剂样品的相结构和光谱性能;以紫外光(λ=254nm)为光源,酸性橙Ⅱ为降解对象,进行光催化活性测试;考察了Zr、Al掺杂对ZnO光催化剂反应活性的影响。研究表明,制备的产物均为六方晶系纤锌矿结构的ZnO;Zr、Al掺杂及Zr–Al共掺的ZnO样品的光催化活性相对于纯ZnO均有较大程度的提高,而且Zr–Al共掺的ZnO的光催化性能明显优于单一掺杂的。Zr–Al共掺可以明显改善ZnO表面状态,使ZnO具有更丰富的表面羟基,同时可以抑制光生电子–空穴对的复合,从而有利于光催化活性和稳定性的提高。
Abstract：Zr-doped,Al-doped,and Zr–Al co-doped ZnO photocatalysts were prepared via a hydrothermal synthesis method and sub-sequent calcination treatment.The structure and spectral properties of the prepared photocatalysts were investigated.The photocata-lytic activity of the prepared catalysts was evaluated by the photocatalytic degradation of acid orangeⅡunder an ultraviolet light(λ = 254 nm) irradiation.The results show that the products prepared are a hexagonal wurtzite structure of ZnO.Compared to pure ZnO,the photocatalytic activity of Zr-doped,Al-doped,and Zr–Al co-doped ZnO photocatalyst samples had a greater improvement,and the photocatalytic performance of the Zr–Al co-doped ZnO was significantly better than that of Zr or Al-doped ZnO.The increased photocatalytic activity for the Zr–Al codoped ZnO sample could be attributed to that the Zr–Al co-doped ZnO photocatalyst had the more OH groups on the surface of doped sample than the pure ZnO.The co-doping could effectively suppress the recombination of photo-generated electron–hole pairs,thus favoring the improvement of photocatalytic activity and stability of ZnO.
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基本信息:
DOI：10.14062/j.issn.0454-5648.2012.03.012
中图分类号:O643.36
引用信息:
[1]余长林,杨凯,吴琼,等.Zr–Al共掺对ZnO光催化剂结构和催化性能的影响[J].硅酸盐学报,2012,40(03):396-401.DOI:10.14062/j.issn.0454-5648.2012.03.012.
基金信息:
国家自然科学基金(21067004);; 江西省自然科学基金(2010-GZH0048);; 厦门大学固体表面物理化学国家重点实验室开放基金(200906)资助项目
2012-02-17
2012-02-17
2012-02-17