One-pot approach for synthesis of N-doped TiO2/ZnFe2O4 hybrid as an efficient photocatalyst for degradation of aqueous organic pollutants.
One-pot approach for synthesis of N-doped TiO2/ZnFe2O4 hybrid as an efficient photocatalyst for degradation of aqueous organic pollutants.
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DOI：
10.1016/j.jhazmat.2015.02.042
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发表时间：
2015-06
影响因子：
13.6
通讯作者：
Yunjin Yao;Jiacheng Qin;Hao Chen;F. Wei;Xueting Liu;Jianlong Wang;Shaobin Wang
中科院分区：
文献类型：
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作者：
Yunjin Yao;Jiacheng Qin;Hao Chen;F. Wei;Xueting Liu;Jianlong Wang;Shaobin Wang
采用一锅法将氮掺杂的TiO 2与ZnFe 2 O 4偶联，成功制备了氮掺杂的TiO 2/ZnFe 2 O 4催化剂。所制备的催化剂的物理化学性质已被其特征在于使用各种光谱和显微技术。考察了光催化剂用量、染料种类、催化剂稳定性对有机染料光催化降解的影响。并对降解动力学和机理以及N掺杂、ZnFe 2 O 4和TiO 2的作用进行了分析。结果表明，与TiO 2/ZnFe 2 O 4或ZnFe 2 O 4相比，N掺杂的TiO 2/ZnFe 2 O 4由于在界面处形成异质结构以及N物种的引入而表现出更好的性能。活性物种，如空穴，电子，羟基自由基，和超氧自由基参与的光降解过程中检测到通过使用不同类型的清除剂。由于混合物中存在ZnFe 2 O 4，催化剂表现出铁磁性，因此在光催化实验后，混合催化剂很容易从反应混合物中分离出来。本工作不仅为制备N掺杂的TiO 2/ZnFe 2 O 4杂化材料提供了一种简单的方法，而且为水的净化提供了一种有效且可回收利用的光催化剂。
N-doped TiO2/ZnFe2O4catalysts were successfully prepared by coupling nitrogen modified TiO2with ZnFe2O4via a one-pot vapor-thermal method. The physicochemical properties of the as-prepared catalysts have been characterized using various spectroscopic and microscopic techniques. The UV–vis-light-driven photocatalytic activities of the hybrids were evaluated and the effects of the amount of photocatalyst, different types of dyes, catalyst stability on photodegradation of organic dyes were investigated. Moreover, degradation kinetics and mechanism as well as the roles of N doping, ZnFe2O4and TiO2have been analyzed. It was revealed that N-doped TiO2/ZnFe2O4exhibited an improved performance compared with TiO2/ZnFe2O4or ZnFe2O4because of the formation of a heterostructure at the interface as well as the introduction of N species. Active species such as holes, electrons, hydroxyl radicals, and superoxide radicals involved in the photodegradation process were detected by using different types of scavengers. Because of ZnFe2O4in the hybrid, the catalyst shows ferromagnetism, and thus, the hybrid catalyst is easily isolated from the reaction mixture after the photocatalytic experiments. This work not only offers a simple method for the fabrication of N doped TiO2/ZnFe2O4hybrids, but also provides an effective and conveniently recyclable photocatalyst for the purification of water.