Highly efficient arsenate removal using novel La-GO/B granules: Performance evaluation and mechanistic exploration in simulated real water system

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2024-11-24 DOI:10.1016/j.molstruc.2024.140900

Lakshmi Prasanna Lingamdinne, Segyeong Kim, Janardhan Reddy Koduru, Yoon-Young Chang

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引用次数: 0

Abstract

This study addresses the primary challenge in arsenate [As(V)] remediation: developing an adsorbent that offers abundant active sites, high affinity, and capacity for As(V) removal while ensuring contaminant levels remain within safe limits. It introduces lanthanum oxide-modified graphene oxide/bentonite (La-GO/B) granules, synthesized in a porous sodium alginate matrix, which exhibit efficient As(V) removal. The granules maintain consistent performance across a pH range of 3–6 and are unaffected by competing ions, demonstrating robustness in complex water environments. With a Langmuir adsorption capacity of 138.45 mg/g at pH 6.0, they retain substantial capacity after five adsorption-desorption cycles. X-ray photoelectron spectroscopy and experimental analysis confirm inner-sphere complexation between As(V) and lanthanum as the main adsorption mechanism. The granules release no detectable lanthanum or by-products, ensuring safety and stability. In fixed-bed column tests, they treat up to 3,800 bed volumes of water, maintaining arsenate concentrations below WHO permissible limits, establishing La-GO/B granules as a promising arsenate adsorbent for water treatment applications.

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.