Facile one-step synthesis of 3D hierarchical flower-like magnesium peroxide for efficient and fast removal of tetracycline from aqueous solution.,Journal of Hazardous Materials

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Facile one-step synthesis of 3D hierarchical flower-like magnesium peroxide for efficient and fast removal of tetracycline from aqueous solution.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-05-13 , DOI: 10.1016/j.jhazmat.2020.122877
Jing Liu ₁ , Yamei Yue ₁ , Wei Wang ₁ , Fatang Tan ₁ , Hongliang Xia ₁ , Xinyun Wang ₁ , Xueliang Qiao ₁ , Po Keung Wong ₂

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Hierarchically three dimensional (3D) flower-like magnesium peroxide (MgO2) nanostructures were synthesized through a facile one-step precipitation method. The effects of magnesium salt, reaction temperature, precipitant and surfactant on the morphology and structure of MgO2 were systematically investigated. The as-obtained samples using magnesium sulfate, ammonia and trisodium citrate were composed of 3D flowers assembled by numerous nanosheets, and SO42- played a vital role in the formation of flower-like nanostructures. The 3D flower-like MgO2 possessed high active oxygen content of 24.10 wt% and large specific surface area of 385 m2/g. Ten mg of flower-like MgO2 could efficiently degrade 90 % of tetracycline (TC) within 60 min under stirring condition. ESR tests and radical quenching experiments suggested that hydroxyl radicals were crucial for TC degradation. Moreover, the column filled with flower-like MgO2 could quickly and efficiently eliminate TC with the assistance of air flow, and the degradation efficiency almost had no decrease even after twenty consecutive runs. Significantly, the concentrations of magnesium and iron ions dissolved in the filtrate from the column were far below the limits of drinking water standards. Additionally, the possible degradation pathways of TC were also proposed according to the determination of generated intermediates during the degradation process.

中文翻译：

轻松一步合成3D分层花状过氧化镁，可从水溶液中快速有效地去除四环素。

通过一种简便的一步沉淀法合成了三维（3D）花状过氧化镁（MgO2）纳米结构。系统研究了镁盐，反应温度，沉淀剂和表面活性剂对MgO2的形貌和结构的影响。所获得的使用硫酸镁，氨水和柠檬酸三钠制成的样品由许多纳米片组装而成的3D花组成，而SO42-在花状纳米结构的形成中起着至关重要的作用。3D花状MgO2具有24.10 wt％的高活性氧含量和385 m2 / g的大比表面积。在搅拌条件下，在60分钟内，十毫克花状MgO2可以有效降解90％的四环素（TC）。ESR测试和自由基猝灭实验表明，羟基自由基对TC降解至关重要。而且，填充有花状MgO2的色谱柱可以借助气流快速有效地消除TC，即使连续运行20次，降解效率也几乎没有降低。值得注意的是，从色谱柱中分离出的滤液中溶解的镁和铁离子的浓度远远低于饮用水标准的限值。此外，根据降解过程中生成中间体的确定，还提出了TC可能的降解途径。即使连续运行二十次，降解效率也几乎没有降低。值得注意的是，从色谱柱中分离出的滤液中溶解的镁和铁离子的浓度远远低于饮用水标准的限值。此外，根据降解过程中生成中间体的确定，还提出了TC可能的降解途径。即使连续运行二十次，降解效率也几乎没有降低。值得注意的是，从色谱柱中分离出的滤液中溶解的镁和铁离子的浓度远远低于饮用水标准的限值。此外，根据降解过程中生成中间体的确定，还提出了TC可能的降解途径。

更新日期：2020-05-13

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