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首页> 外文期刊>Environmental research >Efficient removal of As(Ⅲ) via simultaneous oxidation and adsorption by magnetic sulfur-doped Fe-Cu-Y trimetal oxide nanoparticles
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Efficient removal of As(Ⅲ) via simultaneous oxidation and adsorption by magnetic sulfur-doped Fe-Cu-Y trimetal oxide nanoparticles

机译：磁性硫掺杂Fe-Cu-Y三金属氧化物纳米粒子同时氧化和吸附有效去除As（Ⅲ）

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摘要

A novel magnetic sulfur-doped Fe-Cu-Y trimetal oxide (MST) nanomaterial was successfully synthesized by a chemical coprecipitation method to remove As(Ⅲ) via simultaneous oxidation and adsorption and then characterized by BET, VSM, FESEM, XPS, and FTIR techniques. The effect of solution initial pH on the adsorption of As(Ⅲ), and the adsorption kinetics and isotherm were investigated in detail. The results indicated that the MST nanoparticles exhibited an excellent performance for As(Ⅲ) removal in a pH range of 7-10 and were easily separated from aqueous solution with a magnet. The maximum removal capability for As(Ⅲ) reached 202.0 mg/ g at pH 7.0. The adsorption of As(Ⅲ) was well fitted by the pseudo-second-order kinetic model and Langmuir isotherm model, respectively. The investigation of mechanism revealed that As(Ⅲ) could be oxidized to As(Ⅴ) by O_2·~- and • OH free radicals, generated via the dissolved O_2 obtaining an electron from Cu(Ⅰ) on the surface of the adsorbent and Fenton/Fenton-like reaction, respectively. Meanwhile, the produced As(Ⅴ) was adsorbed onto the surface of the nanoparticles through the electrostatic attraction or diffusion. The adsorbed As(Ⅴ) further interacted with -OH groups via ion exchange or with Y(Ⅲ) on the surface of the adsorbent to form a precipitate. Therefore, the MST nanoparticles are promising for the removal of arsenic from water.
机译：通过化学共沉淀法成功合成了一种新型的磁性掺杂硫的Fe-Cu-Y三金属氧化物纳米材料，同时氧化吸附同时去除了As（Ⅲ），并用BET，VSM，FESEM，XPS和FTIR进行了表征。技术。详细研究了溶液初始pH值对As（Ⅲ）的吸附，吸附动力学和等温线的影响。结果表明，MST纳米粒子在7-10的pH范围内表现出优异的As（Ⅲ）去除性能，并且容易用磁铁从水溶液中分离出来。在pH 7.0下，As（Ⅲ）的最大去除能力达到202.0 mg / g。准二级动力学模型和Langmuir等温模型分别拟合了As（Ⅲ）的吸附。机理研究表明，As（Ⅲ）可被溶解的O_2所产生的O_2·〜-和•OH自由基氧化为As（Ⅴ），从而在吸附剂和Fenton表面上从Cu（Ⅰ）获得电子/ Fenton样反应。同时，通过静电吸引或扩散将产生的As（Ⅴ）吸附到纳米颗粒的表面上。吸附的As（Ⅴ）通过离子交换进一步与-OH基团相互作用，或与吸附剂表面的Y（Ⅲ）相互作用形成沉淀。因此，MST纳米颗粒有望从水中去除砷。

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  • 来源
    《Environmental research》 |2020年第1期|14.1-14.9|共9页
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    College of Sciences Nanjing Agricultural University Nanjing 210095 PR China;

    Academic Affairs Office of Nanjing Agricultural University Nanjing 210095 PR China;

    College of Resources and Environmental Sciences Nanjing Agricultural University Nanjing 210095 PR China Technology Center China Tobacco Jiangsu Industrial Co. Ltd. Nanjing 210019 PR China;

    College of Resources and Environmental Sciences Nanjing Agricultural University Nanjing 210095 PR China;

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  • 正文语种 eng
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  • 关键词

    Sulfur-doped Fe-Cu-Y trimetal oxides; As(Ⅲ) removal; Adsorption; Oxidation; Magnetic separation;

    机译：硫掺杂的Fe-Cu-Y三金属氧化物;砷（Ⅲ）的去除;吸附;氧化;磁选;

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