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Removal of As(V) from groundwater using functionalized magnetic adsorbent materials: Effects of competing ions

机译：使用功能化磁性吸附材料去除地下水中的As（V）：竞争离子的影响

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The occurrence of arsenic is frequently observed in groundwaters around the world and harshly affects several million people. Although different technologies have been proven to be efficient to face this environmental threat, adsorption with functionalized magnetic nanomaterials is one of the best alternatives, due to its flexibility and efficient energy use. However, the presence of competing ions typically found in natural waters might affect the arsenic removal efficacy. This paper reports the effect of the presence of carbonate, sulphate, nitrate, silicate, phosphate, chloride, fluoride and iron ions on the arsenate adsorption onto magnetic SiO2/Fe3O4 functionalized with aminoalkoxysilane groups incorporating Fe3+. The adsorption equilibrium of arsenate in the concentration range 50-1000 mu g L-1 was satisfactorily described by linear isotherms with values of the equilibrium parameter KH,298K = 278.8 L g(-1) in monocomponent systems and K-H,K-298K = 1.80 L g(-1) in the presence of competing ions. Carbonate and especially phosphate are demonstrated to be the main species affecting the process with contributions to the loss of efficacy around 70%. Finally, the material reuse after five adsorption cycles and one regeneration stage with NaOH was assessed under several composition scenarios reaching adsorption yields similar to those obtained with fresh materials. (C) 2015 Elsevier B.V. All rights reserved.
机译：在世界各地的地下水中经常观察到砷的产生，并严重影响了数百万人。尽管已证明不同的技术可以有效地应对这一环境威胁，但功能化的磁性纳米材料的吸附由于其灵活性和高效的能耗而成为最好的选择之一。但是，通常在天然水中发现的竞争性离子的存在可能会影响除砷效果。本文报道了碳酸根，硫酸根，硝酸根，硅酸根，磷酸根，氯离子，氟离子和铁离子的存在对砷在吸附有Fe3 +的氨基烷氧基硅烷基团官能化的磁性SiO2 / Fe3O4上的吸附作用。线性等温线令人满意地描述了砷酸盐在50-1000μg L-1浓度范围内的吸附平衡，其平衡参数KH，298K = 278.8 L g（-1）在单组分系统中，KH，K-298K =在竞争离子的存在下为1.80 L g（-1）。碳酸盐，尤其是磷酸盐被证明是影响该过程的主要物质，其功效降低了约70％。最终，在几种组成情况下评估了五个吸附循环和一个NaOH再生阶段后材料的再利用，达到了与新鲜材料相似的吸附产量。 （C）2015 Elsevier B.V.保留所有权利。

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