ABSTRACT

Contamination of water with arsenic is a major global health problem. The use of adsorbent materials for the removal of As from aqueous systems is a plausible solution to this problem. In this work, the use of commercial bentonites (purified and modified with iron (III)) for the removal of As from water was studied. The samples were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier Transformed Infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and nitrogen adsorption/desorption isotherms to determine their physicochemical properties. The arsenic removal capacities of adsorbent materials were studied from 1 mg/L solutions of As (III) using the colorimetric technique of molybdenum blue. High adsorption capacity (0.33 mg/g) of As (III) was obtained in aqueous systems after 1 h of treatment with unmodified bentonite. The incorporation of iron improved the removal performance in short times. The obtained results could be the starting point for the development of a low-cost filtration system that contributes to solve the problem of arsenic in water.

摘要

砷污染水是一个主要的全球健康问题。使用吸附材料从水系统中去除 As 是解决这个问题的合理方法。在这项工作中，研究了使用商业膨润土（用铁 (III) 纯化和改性）去除水中的 As。通过 X 射线荧光 (XRF)、X 射线衍射 (XRD)、X 射线光电子能谱 (XPS)、傅里叶变换红外光谱 (FTIR)、热重分析 (TGA) 和氮吸附/脱附等温线对样品进行表征以确定它们的物理化学性质。使用钼蓝比色技术从 1 mg/L As (III) 溶液中研究吸附材料的砷去除能力。高吸附容量（0. 在用未改性膨润土处理 1 小时后，在含水体系中获得了 33 mg/g) As (III)。铁的加入提高了短时间内的去除性能。获得的结果可能是开发有助于解决水中砷问题的低成本过滤系统的起点。