Cobalt promoted TiO2/GO for the photocatalytic degradation of oxytetracycline and Congo Red
Cobalt promoted TiO2/GO for the photocatalytic degradation of oxytetracycline and Congo Red
复制标题
DOI：
10.1016/j.apcatb.2016.08.022
复制
发表时间：
2017-02-01
影响因子：
22.1
通讯作者：
Karthikeyan, S.
中科院分区：
文献类型：
--
作者：
Jo, Wan-Kuen;Kumar, Santosh;Karthikeyan, S.
通过溶胶-凝胶和水热两种途径合成的二氧化钛基纳米复合材料在光催化降解土霉素和刚果红两种典型水污染物方面表现出优异的性能。低负荷的Co3O4纳米颗粒分散在锐钛矿TiO2表面，通过产生的异质结和减小的带隙，为有机物的水相分解提供了可见光活性。随后，在二胺连接剂的存在下，用微量氧化石墨烯纳米片修饰这些Co3O4/TiO2复合材料，通过增强光响应和随之产生的自由基，进一步促进了模拟太阳和可见光照射下土霉素和刚果红的光降解。自由基猝灭和荧光实验表明，孔自由基和羟基自由基分别是负责污染物氧化光降解的主要和次要活性物质。(C) 2016年作者。这是一篇基于CC by许可的开放获取文章。
A family of titania derived nanocomposites synthesized via sol-gel and hydrothermal routes exhibit excellent performance for the photocatalytic degradation of two important exemplar water pollutants, oxytetracycline and Congo Red. Low loadings of Co3O4 nanoparticles dispersed over the surfaces of anatase TiO2 confer visible light photoactivity for the aqueous phase decomposition of organics through the resulting heterojunction and reduced band gap. Subsequent modification of these Co3O4/TiO2 composites by trace amounts of graphene oxide nanosheets in the presence of a diamine linker further promotes both oxytetracycline and Congo Red photodegradation under simulated solar and visible irradiation, through a combination of enhanced photoresponse and consequent radical generation. Radical quenching and fluorescence experiments implicate holes and hydroxyl radicals as the respective primary and secondary active species responsible for oxidative photodegradation of pollutants. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.