Removal of Fe3+ Ions from Aqueous Solutions by Adsorption on Natural Eco-Friendly Brazilian Palygorskites

Mining Pub Date : 2024-01-19 DOI:10.3390/mining4010004

A. Middea, Luciana dos Santos Spinelli, F. G. de Souza Junior, Thais L. A. P. Fernandes, Luiz Carlos de Lima, Vitoria Maria Tupinamba Souza Barthem, Otávio da Fonseca Martins Gomes, Reiner Neumann

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Abstract

This work focuses on the characterization of five palygorskite clays from the Brazilian state of Piaui and their feasibility as eco-friendly adsorbents for the removal of Fe3+ ions from aqueous solutions. For characterization, we applied the techniques of X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS), size distribution measurements, density measurement by He pycnometry, superconducting quantum interference device (SQUID) magnetometry, Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA/DTA), zeta potential measurement, hydrophobicity determination by contact angle, Brunauer–Emmett–Teller surface area analysis (BET technique) and atomic force microscopy (AFM). Batch experiments were performed in function of process parameters such as contact time and initial concentration of Fe3+. The natural palygorskites (Palys) had excellent performance for the removal of Fe3+ from aqueous solutions by adsorption (around 60 mg/g), and the Langmuir is supposedly the best model fitted the experimental data.

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利用天然环保型巴西鳞片石吸附去除水溶液中的 Fe3+ 离子

这项研究的重点是巴西皮奥伊州的五种白云石粘土的特征及其作为环保型吸附剂去除水溶液中 Fe3+ 离子的可行性。在表征过程中，我们采用了 X 射线衍射 (XRD)、X 射线荧光 (XRF)、扫描电子显微镜与能量色散光谱 (SEM/EDS)、粒度分布测量、He pycnometry 密度测量、超导量子干涉装置 (SQUID) 磁力测量等技术、傅立叶变换红外光谱法 (FTIR)、热重分析法 (TGA/DTA)、ZETA 电位测量法、接触角疏水性测定法、布鲁诺-艾美特-泰勒表面积分析法 (BET 技术) 和原子力显微镜 (AFM)。根据接触时间和 Fe3+ 初始浓度等工艺参数进行了批量实验。天然鳞片菱锰矿（Palys）在通过吸附去除水溶液中的 Fe3+ 方面具有优异的性能（约 60 mg/g），Langmuir 是拟合实验数据的最佳模型。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Mining

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2.80

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