Rha Sunwon, Jo Ho Young
Department of Earth and Environmental Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
Department of Earth and Environmental Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
J Hazard Mater. 2021 Jun 15;412:125290. doi: 10.1016/j.jhazmat.2021.125290. Epub 2021 Feb 2.
This study evaluates the use of waste foundry dust (WFD) as a reactive material for mitigating water pollution using As(III) and Cr(VI) as model contaminants. A detailed structural characterization of WFD was performed using X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). Batch removal experiments and kinetic studies for removal of both As(III) and Cr(VI) were conducted at various initial pH values (2-10), concentrations (1-100 mg/L), and solid-to-liquid ratios (2.5-125 g/L). The results show that WFD consisted of small particles (< 30 µm) with magnetic properties, mainly composed of quartz (SiO2) and magnetite (Fe3O4). The maximum removal capacity of WFD was 12.6 mg/g for As(III) at pH 3.0 and 6.1 mg/g for Cr(VI) at pH 5.0. WFD was effective in a wide pH range, from 3.0 to 8.0, and in high concentrations, up to 100 mg/L. WFD removed As(III) and Cr(VI) from aqueous solutions through complex processes including adsorption, precipitation, and redox reactions by oxidation of Fe(II). The results of this study suggest that WFD can be used as a reactive material for removal of As(III) and Cr(VI) from aqueous solutions.
本研究评估了将铸造废尘（WFD）用作活性材料，以砷（III）和铬（VI）作为模型污染物来减轻水污染的情况。使用X射线衍射（XRD）、X射线荧光光谱（XRF）、扫描电子显微镜-能量色散X射线光谱（SEM-EDX）、傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）对WFD进行了详细的结构表征。在不同的初始pH值（2-10）、浓度（1-100mg/L）和固液比（2.5-125g/L）下，进行了去除砷（III）和铬（VI）的批次去除实验及动力学研究。结果表明，WFD由具有磁性的小颗粒（<30µm）组成，主要成分是石英（SiO₂）和磁铁矿（Fe₃O₄）。在pH值为3.0时，WFD对砷（III）的最大去除容量为12.6mg/g；在pH值为5.0时，对铬（VI）的最大去除容量为6.1mg/g。WFD在pH值3.0至8.0的较宽范围内以及高达100mg/L的高浓度下均有效。WFD通过包括吸附、沉淀以及Fe（II）氧化引发的氧化还原反应等复杂过程，从水溶液中去除砷（III）和铬（VI）。本研究结果表明，WFD可作为从水溶液中去除砷（III）和铬（VI）的活性材料。
