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Adsorption of Phosphate and Nitrate Ions on Oxidic Substrates Prepared with a Variable-Charge Lithological Material
Water ( IF 3.4 ) Pub Date : 2022-08-09 , DOI: 10.3390/w14162454
José Gregorio Prato, Fernando Carlos Millán, Luisa Carolina González, Anita Cecilia Ríos, Esteban López, Iván Ríos, Siboney Navas, Andrés Márquez, Julio César Carrero, Juan Isidro Díaz

This work evaluates phosphate and nitrate ion adsorption from aqueous solutions on calcined adsorbent substrates of variable charge, prepared from three granulometric fractions of an oxidic lithological material. The adsorbent material was chemically characterized, and N2 gas adsorption (BET), X-ray diffraction, and DTA techniques were applied. The experimental conditions included the protonation of the beds with HCl and H2SO4 and the study of adsorption isotherms and kinetics. The lithological material was moderately acidic (pH 5) with very little solubility (electrical conductivity 0.013 dS m−1) and a low cation exchange capacity (53.67 cmol (+) kg−1). The protonation reaction was more efficient with HCl averaging 0.745 mmol versus 0.306 mmol with H2SO4. Likewise, the HCl-treated bed showed a better adsorption of PO4−3 ions (3.296 mg/100 g bed) compared to the H2SO4-treated bed (2.579 mg/100 g bed). The isotherms showed great affinity of the PO4−3 ions with the oxide surface, and the data fit satisfactorily to the Freundlich model, suggesting a specific type of adsorption, confirmed by the pseudo-second-order kinetic model. In contrast, the nitrate ions showed no affinity for the substrate (89.7 µg/100 g for the HCl-treated bed and 29.3 µg/100 g bed for the H2SO4-treated bed). Amphoteric iron and aluminum oxides of variable charges present in the lithological material studied allow for their use as adsorbent beds as an alternative technique to eliminate phosphates and other ions dissolved in natural water.

中文翻译:

用可变电荷岩性材料制备的氧化基质上的磷酸根和硝酸根离子的吸附

这项工作评估了水溶液中磷酸盐和硝酸根离子在由氧化岩性材料的三个粒度级分制备的可变电荷的煅烧吸附剂基质上的吸附。对吸附材料进行了化学表征,并应用了 N 2气体吸附 (BET)、X 射线衍射和 DTA 技术。实验条件包括用 HCl 和 H 2 SO 4对床进行质子化以及吸附等温线和动力学的研究。岩性材料呈中等酸性(pH 5),溶解度很小(电导率 0.013 dS m -1)和低阳离子交换容量(53.67 cmol (+) kg -1)。平均 0.745 mmol 的 HCl 与 H 2 SO 4的 0.306 mmol 相比,质子化反应更有效。同样,与H 2 SO 4处理的床(2.579 mg/100 g床)相比,HCl处理的床显示出更好的PO 4 -3离子吸附(3.296 mg/100 g床)。等温线显示PO 4 -3离子与氧化物表面的亲和力很大,数据与Freundlich模型令人满意地吻合,表明一种特定的吸附类型,由准二级动力学模型证实。相比之下,硝酸根离子对底物没有亲和力(HCl 处理床为 89.7 µg/100 g,H 2 SO 4床为 29.3 µg/100 g处理过的床)。研究的岩性材料中存在的可变电荷的两性铁和铝氧化物允许将它们用作吸附床,作为消除溶解在天然水中的磷酸盐和其他离子的替代技术。
更新日期:2022-08-09
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