High-efficiency fluoride removal using hierarchical flower-like magnesium oxide: Adsorption characteristics and mechanistic insights

IF 2.7 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY New Journal of Chemistry Pub Date : 2024-09-13 DOI:10.1039/d4nj03012e

Liting Zhang, Chenyuan Cui, Chunmei Zhu, Lu Gong, Min Li, Siwei Xiang, Bo Yu

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Abstract

In this study, hydrothermally synthesized magnesium oxide demonstrated effective fluoride adsorption, with a maximum capacity of 199.67 mg·g^–1 and equilibrium achieved within 60 min. The morphology of magnesium oxide and adsorption mechanism were investigated by SEM, FTIR, BET and XPS. The adsorption process conformed to the Freundlich isotherm and pseudo-second-order kinetic models. The ΔH and ΔS of fluoride adsorption by this material were 44.58 kJ·mol^-1 and 163.31 J·mol^-1·K^-1, respectively. Indicating surface heterogeneity and specific adsorption kinetics. Optimal fluoride removal was observed in the pH range of 4-11, with the highest adsorption capacity achieved at pH 5.0. Co-existing ions significantly influenced the adsorption performance(Cl⁻ < NO₃⁻ < SO₄²⁻ < HCO₃⁻ < PO₄³⁻). These findings underscore the potential application of magnesium oxide in water treatment and suggest avenues for further optimization of synthesis and operational parameters.

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利用分层花状氧化镁高效去除氟化物：吸附特性与机理启示

在这项研究中，水热合成的氧化镁表现出了有效的氟化物吸附能力，最大吸附量为 199.67 mg-g-1，并在 60 分钟内达到平衡。扫描电镜、傅立叶变换红外光谱、BET 和 XPS 对氧化镁的形貌和吸附机理进行了研究。吸附过程符合 Freundlich 等温线和伪二阶动力学模型。该材料吸附氟化物的 ΔH 和 ΔS 分别为 44.58 kJ-mol-1 和 163.31 J-mol-1-K-1。这表明表面具有异质性和特定的吸附动力学。在 pH 值为 4-11 的范围内，氟的去除效果最佳，pH 值为 5.0 时的吸附能力最高。共存离子对吸附性能有很大影响（Cl- < NO₃- < SO₄²- < HCO₃- < PO₄³-）。这些发现强调了氧化镁在水处理中的潜在应用，并提出了进一步优化合成和操作参数的途径。

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