Environmental Sciences Division, Instituto Potosino de Investigación Científica y Tecnológica A. C., 78216, San Luis Potosí, S.L.P., México.
Surface Chemistry Lab, Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, 78210, San Luis Potosí, S.L.P., México.
Environ Sci Pollut Res Int. 2020 Sep;27(26):33362-33372. doi: 10.1007/s11356-020-09492-8. Epub 2020 Jun 12.
Arsenic in groundwater for human consumption has negative effects on human's health worldwide. Due to the above, it is essential to invest in the development of new materials and more efficient technology for the elimination of such priority contaminants as arsenic. Therefore, in the present work, it was synthesized an amorphous hybrid material ZrOx-FeOx with a high density of OH groups, to improve the arsenic adsorption capacity of iron (FeOx) and zirconium (ZrOx) that makes up the bimetallic oxyhydroxide. The spectra of FT-IR and pK's distribution suggest that in the synthesized binary oxides, a new union between the two metallic elements is formed by means of an oxygen (metal-O-metal). In addition, TEM profiles suggest that there are chemical interactions between both metals since no individual particles of iron oxide and zirconium oxide were found. According to the results, the adsorption capacity of the ZrOx-FeOx material increases 4.5 and 1.4 times with respect to FeOx and ZrOx, respectively. At pH 6, the maximum adsorption capacity was 27 mg g, but at pH greater than 7, the arsenic adsorption capacity onto ZrOx-FeOx decreased 66%. Graphical Abstract.
饮用水中的砷会对全世界人类的健康产生负面影响。鉴于此，必须投资开发新型材料和更有效的技术，以去除砷等优先污染物。因此，在本工作中，合成了一种具有高密度 OH 基团的无定形杂化材料 ZrOx-FeOx，以提高构成双金属氢氧化物的铁 (FeOx) 和锆 (ZrOx) 的砷吸附能力。FT-IR 谱和 pK 的分布表明，在合成的二元氧化物中，通过氧（金属-O-金属）在两种金属元素之间形成了新的结合。此外，TEM 图谱表明两种金属之间存在化学相互作用，因为没有发现单独的氧化铁和氧化锆颗粒。结果表明，ZrOx-FeOx 材料的吸附能力分别比 FeOx 和 ZrOx 提高了 4.5 和 1.4 倍。在 pH 值为 6 时，最大吸附容量为 27mg/g，但在 pH 值大于 7 时，ZrOx-FeOx 对砷的吸附能力下降了 66%。
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