Departamento de Ingeniería Química, Facultad de Ciencias, Campus de Teatinos, Universidad de Málaga, Málaga, E-29071, Spain; University of Sfax, Faculty of Sciences, BP1171-3018, Sfax, Tunisia.
Departamento de Ingeniería Química, Facultad de Ciencias, Campus de Teatinos, Universidad de Málaga, Málaga, E-29071, Spain.
Chemosphere. 2021 Apr;269:128703. doi: 10.1016/j.chemosphere.2020.128703. Epub 2020 Oct 22.
In this study, a facile and effective route to prepare hybrid photocatalysts (paper-TiO, paper-TiO-AgBr and paper-AgBr-TiO) has been reported. The preparation procedure consisted of the direct adsorption of the previously synthesized titania nanoparticles (TiO sol) to generate the TiO nanosphere and the immersion process in an aqueous suspension of AgBr to form the AgBr nanoclusters on paper fibers. The synthesis technology is economic, efficient, environmentally friendly and easy to implement even at industrial scale. A cellulose-based structure with well dispersed TiO particles of around 1 μm and a pseudo-liquid coating of Ag and AgBr species was obtained. All the prepared photocatalysts demonstrated effective photocatalytic performance in gaseous phase ethanol degradation with simulated sunlight illumination, through the direct mineralization to CO and the parallel reaction via acetaldehyde degradation. A relevant improvement in the photocatalytic activity was noticed when TiO was associated with AgBr nanocrystals, with a higher effect observed when AgBr was loaded onto the paper surface prior to TiO. Ag-Ti interaction reduces the pair recombination rate and increases the available charge carriers generating reactive OH- radicals from both Ag-species and TiO, and O radicals from Ag-AgBr species, which would be involved in the ethanol degradation process.
在这项研究中，报告了一种简便有效的制备杂化光催化剂（纸-TiO、纸-TiO-AgBr 和纸-AgBr-TiO）的方法。制备过程包括将预先合成的二氧化钛纳米粒子（TiO 溶胶）直接吸附到生成 TiO 纳米球上，以及将其浸入 AgBr 的水悬浮液中，在纸纤维上形成 AgBr 纳米簇。该合成技术经济、高效、环保，即使在工业规模上也易于实施。得到了具有良好分散的约 1μm 的 TiO 颗粒和 Ag 和 AgBr 物种的类液态涂层的纤维素基结构。所有制备的光催化剂在模拟太阳光照射下的气相乙醇降解中都表现出有效的光催化性能，通过直接矿化生成 CO 和通过乙醛降解的平行反应。当 TiO 与 AgBr 纳米晶体结合时，光催化活性得到了相关的提高，当 AgBr 先负载到纸表面上再负载 TiO 时，效果更高。Ag-Ti 相互作用降低了电子-空穴对的复合速率，并增加了来自 Ag 物种和 TiO 的活性 OH-自由基以及来自 Ag-AgBr 物种的 O 自由基，它们将参与乙醇降解过程。
