光降解
壳体(结构)
芯(光纤)
复合材料
材料科学
光催化
化学
催化作用
生物化学
作者
Baolai Wang,Kaili Wei,Xi Mo,Jianhang Hu,Guannan He,Yinzhen Wang,Wei Li,Qinyu He
出处
期刊:ES materials & manufacturing
[Engineered Science Publisher]
日期:2019-01-01
被引量:16
摘要
Recycling of photocatalysts is necessary for cost reduction.However, the photocatalytic properties of most reused photocatalysts deteriorate with recycled times.Thus, it is imperative to determine the dominant factor that affects the photocatalytic properties of recycled photocatalysts and find a way to improve the photocatalytic properties of recycled photocatalysts.In this work, microsized magnetic Fe O powders were 3 4 successfully encapsulated by carbon-doped anatase titanium (C-TiO ) by the sol-gel method to form a core (Fe O )-shell (C-TiO ) structure 2 3 4 2(DTF).The core-shell particles were characterized by X-ray diffraction, UV-vis diffuse reflectance spectral analysis, high-resolution transmission electron microscopy, specific surface area and magnetic properties.In addition, photocatalytic properties as well as the recovery rate were measured.It was evidenced that the as-prepared DTF powder has a larger specific surface area and a much higher dark adsorption than the nanosized C-TiO and commercial Fe O .Moreover, DTF has a high recovery rate and a first-order kinetic function k.Furthermore, it 2 3 4 was evidenced that pH significantly affected the photodegradation efficiency of DTF.Thus, a strategy that the solution pH was modulated to a constant value of 3 was carried out, resulting in improved photodegdradation efficiency of recycled DTF.The present work could provide a new route to improving the photocatalysis efficiency and the recycles of photocatalysts. RESEARCH PAPER2 photocatalyst and is immensely studied, as it is stable, eco-friendly, 1 economic, and has a strong intrinsic oxidizing power.In previous studies, many efforts were made to increase its surface area to maximize the photocatalytic surface reactions by proposing various forms of TiO 2 2 3 4 nanomaterials such as nanoparticles, nanowires, and nanotubes.However, three drawbacks remain for anatase TiO : 1) limited 2 absorption wavelength range (< 380 nm; only 5% of sunlight) owing to 5 3 4 carbon doped anatase TiO (C-TiO ) and formed core-shell composites 2 2 (Fe O @(C-TiO , denoted as DTF).The Fe O powder used in this work
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