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首页> 外文期刊>Chemical engineering journal >Selective sequestration of p-arsanilic acid from water by using nano-hydrated zirconium oxide encapsulated inside hyper-cross-linked anion exchanger
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Selective sequestration of p-arsanilic acid from water by using nano-hydrated zirconium oxide encapsulated inside hyper-cross-linked anion exchanger

机译：通过使用纳米水合氧化锆包封在超交联阴离子交换器内的氧化锆氧化物的选择性螯合来自水的氧化物

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摘要

Aromatic organoarsenic compounds (AOCs) are widely used as animal feed additives worldwide. Their concentration in waters is often much lower than the ubiquitous anions or natural organic matters (NOMs), e.g., below 1 mg.L-1. The efficient removal of AOCs from waters still remains challenging owing to their high stability and mobility. Herein, we employed a recently developed nanocomposite HZO@HCA, i.e., nano-hydrated zirconium oxide (HZO) encapsulated inside hyper-cross-linked anion exchanger (HCA), to decontaminate water from p-arsanilic acid (p-ASA), a representative AOC. Due to the specific interaction between nano-HZO and arsenic moieties, HZO@HCA exhibited preferable p-ASA adsorption (> 23.00 mg.g(-1)) even in presence of massive sulfate, chloride and nitrate (300 mg.L-1). Moreover, the hyper-cross-linked nature of HCA host endowed HZO@HCA with abundant micropores (< 2 nm), which prevented humic acid (HA, a representative NOM) diffusing inside the nanocomposite because of size exclusion. Thereby, the adsorption of HZO@HCA toward p-ASA was almost unaffected by the coexisting HA (2-10 mg.L-1). A successive 5-cyclic adsorption-regeneration assay suggested that the exhausted adsorbent could be fully refreshed by NaOH-NaCl binary solution for repeated use without any loss in adsorption efficiency. Fixed-bed adsorption demonstrated that HZO@HCA column could successively generate similar to 680 bed volume (BV) effluent from a synthetic surface water containing p-ASA to meet surface water quality standards of China ([As] < 50 mu g.L-1), while the HCA column could only generate similar to 80 BV effluent under otherwise identical conditions. This study may provide new opportunity for advanced treatment of AOCs-contaminated water.
机译：芳族有机静脉化合物（AOC）广泛用作全球动物饲料添加剂。它们在水中的浓度通常远低于无处不在的阴离子或天然有机物质（NOM），例如，低于1mg.L-1。由于其高稳定性和流动性，从水中的高效除去AOC仍然仍然具有挑战性。在此，我们使用最近开发的纳米复合材料HZO-HCA，即包封在超交联阴离子交换剂（HCA）内的纳米水合氧化锆（HZO），以从对芳酸（P-ASA）的水净化水，a代表性AOC。由于纳米 - HZO和砷部分之间的特异性，HZO @ HCA即使存在大规模硫酸盐，氯化物和硝酸盐（300mg.L-1），也表现出优选的P-ASA吸附（> 23.00mg.g（-1）） ）。此外，HCA宿主的超交联性质赋予HZO @ HCA，具有丰富的微孔（<2nm），其由于尺寸排阻而防止纳米复合材料内的腐殖酸（HA，代表性NOM）。由此，HZO @ HCA朝向P-ASA的吸附几乎不受共存HA（2-10mg.L-1）的影响。连续的5循环吸附 - 再生测定结果表明，通过NaOH-NaCl二元溶液完全刷新排气吸附剂，用于重复使用，而无需任何吸附效率。固定床吸附表明，HZO @ HCA柱可以连续地产生与含有P-ASA的合成表面水的680床体积（BV）流出物，以满足中国的地表水质标准（[AS] <50亩GL-1） ，而HCA柱只能在否则相同的条件下产生类似于80 BV流出物。本研究可为AOCS污染水进行先进治疗提供新的机会。

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