A novel Au-loaded Na2Ta2O6 multifunctional catalyst: Thermocatalytic and photocatalytic elimination of the poisonous nitrobenzene derivatives from wastewater under natural condition
A novel Au-loaded Na2Ta2O6 multifunctional catalyst: Thermocatalytic and photocatalytic elimination of the poisonous nitrobenzene derivatives from wastewater under natural condition
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新型载金Na2Ta2O6多功能催化剂：自然条件下热催化和光催化消除废水中有毒硝基苯衍生物
DOI：
10.1016/j.jallcom.2016.10.177
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发表时间：
2017-02-25
影响因子：
6.2
通讯作者：
Wang, Xiaojing
中科院分区：
文献类型：
--
作者：
Liu, Xiaoqing;Su, Yiguo;Wang, Xiaojing
本文采用化学还原法制备了一系列Au负载的Na 2 Ta 2 O 6纳米复合光催化剂。结果表明，纳米Au颗粒（约5 nm）均匀地固定在Na_2 Ta_2 O_6颗粒表面，具有良好的八面体结晶形貌。所制备的样品表现出高效率和良好的可回收性，对有毒的硝基苯还原为无毒的氨基苯。在模拟太阳光照射下，硝基苯（NB）衍生物的还原速率为2666.7 min（-1）g（-1）。结果表明，在4 min内，对硝基苯酚可完全转化为对氨基苯，转化率是黑暗条件下的2.35倍。通过对几种具有代表性的载体材料在不同反应条件下的活性评价，提出了一种新的光协同催化机理。在热催化过程中，可见光激发下Au纳米粒子的表面等离子体共振，以及紫外光辅助下电子从Na_2 Ta_2 O_6半导体到Au纳米粒子的转移，都对实现太阳光下对硝基苯酚的高效还原做出了显著贡献。(C)2016爱思唯尔B. V.保留所有权利。
In this work, a series of Au-loaded Na2Ta2O6 nanocomposite photocatalysts were prepared via a chemical reduction process. It was observed the tiny Au nanoparticles (similar to 5 nm) uniformly anchored on the surface of Na2Ta2O6 nanoparticles with a well crystallized octahedral morphology. The as-prepared samples demonstrated high efficiency and good recyclability toward reduction of toxic nitrobenzenes to nontoxic aminobenzene. Significantly, a very quickly rate of 2666.7 min(-1) g(-1) under the simulated solar light irradiation was observed for nitrobenzenes (NB) derivatives reduction. It was found 4-nitrophenol can be completely converted to 4-aminobenzene in only 4 min, 2.35 times higher than that in dark. By evaluate activities over several representative support materials under different reaction conditions, a new photo-synergistic catalytic mechanism was proposed. In the thermocatalytic process, the surface plasmons resonance of Au nanoparticles excited by visible light, and the electron transfer from Na2Ta2O6 semiconductor to Au nanoparticle assisted by ultraviolet light, all make the significantly contributions to achieve the efficient reduction of 4-nitrophenol under solar illumination. (C) 2016 Elsevier B.V. All rights reserved.