Arsenic contamination in natural water has become a global issue because of arsenic’s high toxicity, accumulation in the human body, and carcinogenicity. In this study, a new yttrium–manganese binary composite was developed by a one-step coprecipitation method. The mean diameter of the adsorbent was 6.3 μm, and the point of zero charge was 7.1. The adsorbent had a chemical formula of Y₅Mn₆O₆(OH)₁₂(CO₃)₅·5H₂O according to the results obtained from the analysis of the element and functional group from X-ray photoelectron spectroscopy (XPS) study. The field emission scanning electron microscopy study showed that the adsorbent had a loose structure and was composed of nanosized flakes. The adsorption process was pH-dependent. The removal efficiency of arsenate by the adsorbent was much higher than that of arsenite. The optimal adsorption efficiency of arsenate was obtained at pH 6.0. The kinetics study showed that adsorption equilibrium of arsenate was reached within 25 h. The fit of the experimental data of the adsorption isotherm by the Langmuir model was better than that of the Freundlich model. The maximum arsenate adsorption capacity of 279.9 mg As/g was achieved at pH 7.0, much higher than most reported adsorbents. The presence of fluoride, sulfate, bicarbonate, phosphate, and humic acid had less influence on the arsenate adsorption, while the adsorption capacity was still above 220 mg As/g under the maximum concentration of coexisting substances. Fourier transform infrared spectroscopy and XPS analysis indicated that the hydroxyl group on the adsorbent played a more important role in the arsenate uptake.

中文翻译：

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引入钇-锰二元复合材料，该复合材料在不同水分条件下对砷的吸收具有极高的吸附能力

由于砷的高毒性，在人体中的蓄积和致癌性，天然水中的砷污染已成为全球性问题。在这项研究中，通过一步共沉淀法开发了一种新的钇-锰二元复合材料。吸附剂的平均直径为6.3μm，零电荷点为7.1。该吸附剂的化学式为Y ₅ Mn ₆ O ₆（OH）₁₂（CO ₃）₅ ·5H ₂O根据从X射线光电子能谱（XPS）研究中对元素和官能团的分析获得的结果得出。场发射扫描电子显微镜研究表明，吸附剂结构疏松，由纳米薄片组成。吸附过程是pH依赖性的。吸附剂对砷的去除效率远高于砷。在pH 6.0时获得了砷酸盐的最佳吸附效率。动力学研究表明，在25h内达到了砷酸根的吸附平衡。Langmuir模型对吸附等温线实验数据的拟合优于Freundlich模型。在pH 7.0时，砷的最大吸附量为279.9 mg As / g，远高于大多数报道的吸附剂。氟化物的存在 硫酸根，碳酸氢根，磷酸根和腐植酸对砷酸盐的吸附影响较小，而在共存物质最大浓度下，吸附量仍高于220 mg As / g。傅里叶变换红外光谱和XPS分析表明，吸附剂上的羟基在砷的吸收中起着更重要的作用。