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首页> 外文期刊>Separation and Purification Technology >Fabrication of TiO2-doped single layer graphitic-C3N4 and its visible-light photocatalytic activity
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Fabrication of TiO2-doped single layer graphitic-C3N4 and its visible-light photocatalytic activity

机译：TiO2掺杂单层石墨-C3N4的制备及其可见光光催化活性

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In this work, TiO2-doped single layer graphitic carbon nitride (TiO2/SL g-C3N4) was successfully prepared by a facile stirring and calcination route. The as-prepared TiO2/SL g-C3N4 photocatalysts were systematically characterized to elucidate their morphologies, chemical and photocatalytic properties. The obtained anatase TiO2 nanoparticles dispersed well on the surface of the single layer g-C3N4 sheets. TiO2/SL g-C3N4 displayed increased visible light absorption with a certain extent red-shift of the absorption edge to visible region as compared to pure TiO2. Under visible light irradiation, the optimal TiO2/SL g-C3N4 (the mass ratio of TiO2 and SL g-C3N4 to be 1:5) exhibited enhanced photocurrent response, achieving a photocurrent approximately 2-times higher than SL g-C3N4. All the TiO2/SL g-C3N4 samples had enhanced photodecomposition performance than pure TiO2 or SL g-C3N4. The pseudo-first-order kinetic constant of Rhodamine B (RhB) decomposition on optimal TiO2/SL g-C3N4 was 3.4 times as great as that of pure SL g-C3N4 under the conditions of visible light irradiation with light wavelength more than 400 nm and 150 min treatment after 30 min adsorption equilibrium. The excellent photocatalytic performance TiO2/SL g-C3N4 under visible light irradiation mainly benefited from enhanced separation of photo-generated electron-hole pairs as well as the extended optical absorption edge. Active species trapping experiments indicated that 11(+) played crucial role in photocatalytic process and a possible mechanism for the improved photocatalytic activity was proposed. (C) 2017 Elsevier B.V. All rights reserved.
机译：在这项工作中，通过容易搅拌和煅烧途径成功地制备了TiO2掺杂的单层石墨碳氮化物（TiO2 / SL G-C3N4）。制备的AS制备的TiO2 / SL G-C3N4光催化剂被系统地进行了系统，以阐明它们的形态，化学和光催化性能。所得锐钛矿TiO2纳米颗粒分散在单层G-C3N4片材的表面上。与纯TiO 2相比，TiO2 / SL G-C3N4显示出可见光吸收的可见光吸收随着一定程度的吸收边缘向可见区域的红色移位。在可见光照射下，最佳TiO2 / SL G-C3N4（TiO 2和SL G-C3N4的质量比为1：5）表现出增强的光电流响应，从而实现比SL G-C3N4高约2倍的光电流。所有TiO2 / SL G-C3N4样品的样品具有比纯TiO2或SL G-C3N4增强的光分解性能。在最佳TiO2 / SL G-C3n4上的罗丹明B（RHB）分解的伪第一阶动力学常数在具有大于400nm的光波长的可见光照射条件下的纯SL G-C3n4的纯度为3.4倍。 30分钟吸附平衡后150分钟处理。可见光照射下优异的光催化性能TiO2 / S1 G-C3N4主要受益于增强光产生的电子 - 空穴对的分离以及延伸的光学吸收边缘。活性物种诱捕实验表明，11（+）在光催化过程中发挥了至关重要的作用，提出了改进的光催化活性的可能机制。 （c）2017 Elsevier B.v.保留所有权利。

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