Defect-meditated efficient catalytic activity toward p-nitrophenol reduction: A case study of nitrogen doped calcium niobate system.
Defect-meditated efficient catalytic activity toward p-nitrophenol reduction: A case study of nitrogen doped calcium niobate system.
复制标题
DOI：
10.1016/j.jhazmat.2015.04.036
复制
发表时间：
2015-09
影响因子：
13.6
通讯作者：
Yiguo Su;Shushu Huang;Tingting Wang;Liman Peng;Xiaojing Wang
中科院分区：
文献类型：
--
作者：
Yiguo Su;Shushu Huang;Tingting Wang;Liman Peng;Xiaojing Wang
本工作报道了一系列氮含量可调的掺氮Ca2Nb2O7催化剂的合成，发现它们是催化还原对硝基苯酚的高效、绿色的无贵金属催化剂。XPS和ESR结果表明，Ca2Nb2O7中氮的引入导致了大量的氮和氧缺陷物种的产生。发现缺陷氮和氧物种在对硝基苯酚的还原中起到协同作用。其潜在的机制与已报道的金属纳米颗粒完全不同。此外，较负的导带边缘电位使掺氮Ca2Nb2O7在紫外光照射下表现出光协同效应，加速了对硝基苯酚的还原速率。这项工作可能为通过调节化学组成、电子结构和表面缺陷化学来调节催化剂的性能提供一种策略。
This work reported on the synthesis of a series of nitrogen doped Ca2Nb2O7with tunable nitrogen content that were found to be efficient and green noble-metal-free catalysts toward catalytic reduction ofp-nitrophenol. XPS and ESR results indicated that the introduction of nitrogen in Ca2Nb2O7gave rise to a large number of defective nitrogen and oxygen species. Defective nitrogen and oxygen species were found to play synergetic roles in the reduction ofp-nitrophenol. The underlying mechanism is completely different from those reported for metallic nanoparticles. Moreover, the more negative conduction band edge potential enabled nitrogen doped Ca2Nb2O7to show photo-synergistic effects that could accelerate the reduction rate towardp-nitrophenol under UV light irradiation. This work may provide a strategy for tuning the catalytic performance by modulating the chemical composition, electronic structure as well as surface defect chemistry.