Ultra-high arsenic adsorption by graphene oxide iron nanohybrid: Removal mechanisms and potential applications
Ultra-high arsenic adsorption by graphene oxide iron nanohybrid: Removal mechanisms and potential applications
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DOI：
10.1016/j.chemosphere.2020.126702
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发表时间：
2020-08-01
期刊：
影响因子：
8.8
通讯作者：
Bezbaruah, Achintya N.
中科院分区：
文献类型：
--
作者：
Das, Tonoy K.;Sakthivel, Tamil S.;Bezbaruah, Achintya N.
铁（Fe）基吸附剂因其成本低且易于扩大生产规模而被推广用于砷水溶液吸附。然而，迄今为止，它们的现场应用受到限制，因为它们的铁利用率低（即并非所有可用的铁都被使用）、吸附动力学慢和吸附容量低。在这项研究中，我们通过溶胶-凝胶工艺在氧化石墨烯（GO）表面修饰铁/氧化铁（Fe/FexOy）核壳结构的铁纳米粒子（FeNP），合成了氧化石墨烯铁纳米杂化物（GFeN）。 FeNPs在GO上沉积用于纳米杂化物（GFeN）提高了纳米杂化物中铁的利用效率和砷的迁移率，从而提高了砷的去除能力和动力学。使用 GFeN，我们实现了 306 mg/g As(III) 和 431 mg/g As(V) 的去除能力。快速减少（>99%
Iron (Fe)-based adsorbents have been promoted for aqueous arsenic adsorption because of their low cost and potential ease of scale-up in production. However, their field application is, so far, limited because of their low Fe use efficiency (i.e., not all available Fe is used), slow adsorption kinetics, and low adsorption capacity. In this study, we synthesized graphene oxide iron nanohybrid (GFeN) by decorating iron/iron oxide (Fe/FexOy) core-shell structured iron nanoparticles (FeNPs) on the surface of graphene oxide (GO) via a sol-gel process. The deposition of FeNPs on GO for the nanohybrid (GFeN) improves Fe use efficiency and arsenic mobility in the nanohybrid, thereby improving the arsenic removal capacity and kinetics. We achieved removal capacities of 306 mg/g for As(III) and 431 mg/g for As(V) using GFeN. Rapid reduction (>99% in