Excellent visible light responsive photocatalytic behavior of N-doped TiO2 toward decontamination of organic pollutants
Excellent visible light responsive photocatalytic behavior of N-doped TiO2 toward decontamination of organic pollutants
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DOI：
10.1016/j.jhazmat.2020.123857
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发表时间：
2021-02-05
影响因子：
13.6
通讯作者：
Wang, Tao
中科院分区：
文献类型：
--
作者：
Huang, Jiao;Dou, Lin;Wang, Tao
本论文采用简单的水热法，在NH3气氛中焙烧，成功地合成了具有丰富的可调光催化活性的N掺杂TiO_2（N-TiO_2）。XPS和NBT-O-中心点（2）-定量反应表明，N掺杂提高了TiO 2表面羟基和超氧阴离子（O-中心点（2）-）的数量。低温电子自旋共振（ESR）结果证实了丰富和可调的OV，表明N掺杂到TiO 2中可以肯定地构建比参比TiO 2更高的OV。表面光电压谱（SPS）测试、荧光实验和电化学测试均表明，与纯TiO 2相比，含OV的N-TiO 2光催化剂具有更高的光生e-/h（+）对切断效率。光催化性能评价结果表明，N-TiO 2光催化剂对罗丹明B和四环素的去除效果优于参比TiO 2。在氨气氛中处理1 h的TiO 2光催化性能最好。在氨气氛中处理1h的TiO 2的可见光响应催化性能远高于商业TiO 2（P25）和纯TiO 2。N-TiO_2光催化剂可见光性能的改善主要是由于N的引入产生了丰富的氧空位，并促进了光活化的e-/h（+）的断开。
In this work, N-doped TiO2 (N-TiO2) with ample and tunable OVs was successfully synthesized, deriving from facile hydrothermal method and baked in the NH3 atmosphere. N-doping boosts the amount of surface hydroxyl and superoxide (O-center dot(2)-) of TiO2, demonstrated by XPS and nitroblue tetrazolium (NBT)-O-center dot(2)- quantitative reaction. Rich and tunable OVs were confirmed by low temperature electron spin resonance (ESR) results, demonstrating that doping of N into TiO2 can definitely construct higher OVs than the reference TiO2. Surface photovoltage spectrum (SPS) test, fluorescence experiments and electrochemical measurements all display that N-TiO2 photocatalysts with OVs have a higher severance efficiency of photogenerated e-/h(+) pairs than the pristine TiO2. Photocatalytic evaluation results exhibit that N-TiO2 photocatalysts demonstrate better performance than the reference TiO2 toward decontamination of rhodamine B and tetracycline. TiO2 treated in ammonia atmosphere for 1 h shows the highest photocatalytic property. The visible light responsive catalytic behavior of TiO2 treated in ammonia atmosphere for 1 h is much higher than that of commercial TiO2 (P25) and the pristine TiO2, separately. The ameliorated visible light behavior of N-TiO2 photocatalysts is attributable to rich oxygen vacancies produced through introducing N into TiO2 and the boosted severance of photoactivated e-/h(+).