Simultaneous adsorption and oxidation of antimonite onto nano zero-valent iron sludge-based biochar: Indispensable role of reactive oxygen species and redox-active moieties.,Journal of Hazardous Materials

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Simultaneous adsorption and oxidation of antimonite onto nano zero-valent iron sludge-based biochar: Indispensable role of reactive oxygen species and redox-active moieties.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-01-27 , DOI: 10.1016/j.jhazmat.2020.122057
Dongning Wei ₁ , Bingyu Li ₂ , Lin Luo ₁ , Yongxin Zheng ₁ , Liuhui Huang ₁ , Jiachao Zhang ₁ , Yuan Yang ₁ , Hongli Huang ₁

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The nano zero-valent iron sludge-based biochar (nZVI-SBC) was prepared in this study to eliminate Sb(III) from aqueous solutions, which was characterized by BET, SEM, XRD, TEM, FTIR, XPS. Our results proved that the incorporated nZVI on SBC matrix could significantly enhance eliminating Sb(III), and the max-adsorption capacity (160.40 mg g-1) can be achieved at pH = 4.8 ± 0.2 and temperature of 298 K. The effect of co-existing anions and natural organic matters on the Sb(III) adsorption efficiencies were systematically investigated. The surface complexation is the possible adsorption mechanisms by FTIR and XPS. Furthermore, mechanistic investigation revealed that •OH and hydroquinone radical (H-SQ•-) could be the primary oxidants for the transformation of Sb(III) under oxic conditions, while 9,10-phenanthrene quinone radical (P-SQ•-) were responsible under anoxic conditions. Thus, the enhanced elimination of Sb(III) from aqueous solution was ascribed to the combined adsorption and oxidation. The potential engineering application of nZVI-SBC can be proved through three actual water matrix experiments, including lake water, river water and acid mine drainage. Our present findings proved that nZVI-SBC could be a potential adsorbent, given the excellent performance in the adsorption processes, as well as the toxicity alleviating ability and economic advantages, especially under sub-surface water.

中文翻译：

锑矿在纳米零价铁污泥基生物炭上的同时吸附和氧化：活性氧和氧化还原活性部分的不可或缺的作用。

本研究制备了基于零价铁污泥的纳米生物炭（nZVI-SBC），以从水溶液中去除Sb（III），并通过BET，SEM，XRD，TEM，FTIR，XPS对其进行了表征。我们的结果证明，在SBC基质上掺入nZVI可以显着增强Sb（III）的消除，在pH = 4.8±0.2和298 K的温度下可以实现最大吸附容量（160.40 mg g-1）。系统地研究了共存阴离子和天然有机物对Sb（III）的吸附效率。表面络合是FTIR和XPS可能的吸附机理。此外，机理研究表明，•OH和氢醌自由基（H-SQ•-）可能是在有氧条件下转化Sb（III）的主要氧化剂，而9，10-菲醌自由基（P-SQ•-）在缺氧条件下起作用。因此，从水溶液中消除Sb（III）的原因是结合了吸附和氧化作用。nZVI-SBC的潜在工程应用可以通过湖水，河水和酸性矿山排水三个实际水基质实验来证明。我们目前的发现证明，nZVI-SBC可能是一种潜在的吸附剂，因为它在吸附过程中表现出出色的性能，并且具有缓解毒性的能力和经济优势，尤其是在地下水下。nZVI-SBC的潜在工程应用可以通过湖水，河水和酸性矿山排水三个实际水基质实验来证明。我们目前的发现证明，nZVI-SBC可能是一种潜在的吸附剂，因为它在吸附过程中表现出出色的性能，并且具有缓解毒性的能力和经济优势，尤其是在地下水下。nZVI-SBC的潜在工程应用可以通过湖水，河水和酸性矿山排水三个实际水基质实验来证明。我们目前的发现证明，nZVI-SBC可能是一种潜在的吸附剂，因为它在吸附过程中表现出出色的性能，并且具有缓解毒性的能力和经济优势，尤其是在地下水下。

更新日期：2020-01-27

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