Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
Sci Total Environ. 2017 Dec 1;601-602:713-722. doi: 10.1016/j.scitotenv.2017.05.219. Epub 2017 Jun 1.
Para arsanilic acid (p-ASA) is extensively used as feed additives in poultry industry, resulting contaminates soil and natural water sources through the use of poultry litter as a fertilizer in croplands. Thus, removal of p-ASA prior to its entering environments is significant to control their environmental risk. Herein, we studied Fe-Mn framework and cubic Fe(OH) as promising novel adsorbents for the removal of p-ASA from aqueous solution. The chemical and micro-structural properties of Fe-Mn framework and cubic Fe(OH) materials were characterized by X-ray diffraction patterns (XRD), nitrogen adsorption (S), zeta (ζ-) potential, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectra (XPS). The maximum adsorption capacity for p-ASA on Fe-Mn framework and cubic Fe(OH) was determined to be 1.3mmolg and 0.72mmolg at pH4.0, respectively. Adsorption of p-ASA decreased gradually with increasing pH indicated that adsorption was strongly pH dependent. Azophenylarsonic acid was identified as an oxidation intermediate product of p-ASA after adsorption on Fe-Mn framework. Plausible removal mechanism for p-ASA by Fe-Mn framework was proposed. The obtained results gain insight into the potential applicability of Fe-Mn framework, which can be potentially important for the removal of p-ASA from water.
对氨基苯砷酸（p-ASA）作为饲料添加剂被广泛应用于家禽养殖业，家禽粪便作为肥料施用于农田后，会污染土壤和天然水源。因此，在 p-ASA 进入环境之前将其去除对于控制其环境风险非常重要。本文研究了 Fe-Mn 骨架和立方 Fe(OH)作为从水溶液中去除 p-ASA 的新型吸附剂。通过 X 射线衍射图谱（XRD）、氮气吸附（S）、ζ-电位、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和 X 射线光电子能谱（XPS）对 Fe-Mn 骨架和立方 Fe(OH)材料的化学和微观结构特性进行了表征。在 pH4.0 时，Fe-Mn 骨架和立方 Fe(OH)对 p-ASA 的最大吸附容量分别为 1.3mmolg 和 0.72mmolg。吸附 p-ASA 随 pH 值的增加而逐渐降低，表明吸附强烈依赖于 pH 值。吸附后，Fe-Mn 骨架上的 p-ASA 被鉴定为偶氮苯砷酸的氧化中间产物。提出了 Fe-Mn 骨架去除 p-ASA 的可能机理。研究结果深入了解了 Fe-Mn 骨架的潜在适用性，这对于从水中去除 p-ASA 可能非常重要。
