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Synthesis of novel ZnO nanoparticles with exceptional crystalline and photocatalytic features toward recalcitrant pollutant: Fluorescein dye
Optical Materials ( IF 3.9 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.optmat.2020.110597
E.M. Ezz elregal , M.A. Ahmed , M.F. Abdel-Messih , Z.M. Abou-Gamra

Abstract ZnO is one of the most semiconductors used in vital photocatalytic applications as water splitting to produce H2 fuel and water treatment for the degradation of various water contaminants. In current work, ZnO nanoparticles were fabricated by a facile Template-free sol-gel method and characterized by TGA, XRD, FTIR, FESEM, TEM, EDX, DRS, XPS, and nitrogen adsorption-desorption isotherm. The optical property was investigated by photoluminescence (PL) spectra. As prepared ZnO nanoparticles showed strong UV emission at 398 nm, and three low-intensity bands cover most of the visible range, 450–600 nm, which attributed to the defects in ZnO, including oxygen-vacancy and interstitial Zn defects which reflects its high catalytic activity. The photocatalytic activity of the prepared ZnO nanoparticles was investigated toward the photodegradation of photostable Fluorescein dye (Flu); at pH 7, almost 100% of Fluorescein dye has been disappeared in 150 min. The photodegradation of dye obeys 1st-order kinetics. Besides, the influenceses of various factors like pH, dye concentration, and catalyst dose on the photodegradation were investigated. The reduction in TOC of dye displayed that not only did decolorization occur, but complete mineralization of Fluorescein dye also was achieved. Reusability study showed the catalyst is stable for four times.

中文翻译:

合成具有特殊结晶和光催化特性的新型 ZnO 纳米粒子对顽固污染物:荧光素染料

摘要 ZnO 是在重要的光催化应用中使用最多的半导体之一,如分解水以产生 H2 燃料和用于降解各种水污染物的水处理。在目前的工作中,ZnO 纳米颗粒通过简便的无模板溶胶-凝胶法制备,并通过 TGA、XRD、FTIR、FESEM、TEM、EDX、DRS、XPS 和氮吸附-解吸等温线进行表征。通过光致发光(PL)光谱研究光学性质。制备的 ZnO 纳米粒子在 398 nm 处显示出强烈的紫外线发射,三个低强度波段覆盖了大部分可见光范围,450-600 nm,这归因于 ZnO 中的缺陷,包括氧空位和间隙 Zn 缺陷,反映了其高催化活性。研究了制备的 ZnO 纳米粒子对光稳定荧光素染料 (Flu) 的光降解的光催化活性;在 pH 值为 7 时,150 分钟内几乎 100% 的荧光素染料已消失。染料的光降解服从一级动力学。此外,研究了各种因素如pH值、染料浓度和催化剂剂量对光降解的影响。染料 TOC 的降低表明,不仅发生了脱色,而且还实现了荧光素染料的完全矿化。可重复使用性研究表明催化剂稳定四次。和催化剂剂量对光降解的影响。染料 TOC 的降低表明,不仅发生了脱色,而且还实现了荧光素染料的完全矿化。可重复使用性研究表明催化剂稳定四次。和催化剂剂量对光降解的影响。染料 TOC 的降低表明,不仅发生了脱色,而且还实现了荧光素染料的完全矿化。可重复使用性研究表明催化剂稳定四次。
更新日期:2021-01-01
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