Adsorption of Cu(II) on soil humin: batch and spectroscopy studies

Li, Cuilan; Yan, Aichun; Xie, Xiaolin; Zhang, Jinjing

doi:10.1007/s12665-019-8502-y

Cited by 11 publications

(1 citation statement)

References 52 publications

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“…XPS is a surface analysis method that can give important information about the kinds of elements, chemical composition and related electronic structures on the surface of solid samples [43][44][45]. XPS can clarify the chemical state of atoms bound with Cu ions in soil [46][47][48][49]. In Figure 6, the survey scans of SAS contained O, C, Si, Ca, Al and Mg.…”

Section: Xps Analysis Of Biogas Residue and Saline-alkali Soilmentioning

confidence: 99%

Fate of Copper in Saline–Alkali Soil with Long-Term Application of Biogas Residue

et al. 2023

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The retention of copper (Cu) in saline–alkali soil (SAS) during long-term application of biogas residue (BR) with a high concentration of Cu raises concerns. In this work, the fate of Cu was detected using adsorption isotherms, scanning electron microscope—energy dispersive spectrometer, Fourier transform infrared spectrometer, X-ray diffraction, isothermal titration calorimetry, X-ray photoelectron spectroscopy, and microzone X-ray fluorescence spectrometer. The results showed that the main groups for Cu adsorption by SAS and BR were carboxyl, hydroxyl, amide and amine. The adsorption of Cu by the carboxyl group was entropy–enthalpy co-driven (|ΔH| < |TΔS|, ΔH < 0). The adsorption of Cu by the amine group was entropy-driven (|ΔH| > |TΔS|, ΔH > 0). The adsorption of Cu on the SAS and BR was achieved by organic matter rather than minerals. The degradation of BR in the SAS increases the content of Cu adsorption groups such as carboxyl and amine groups, and Cu was adsorbed on the surface or inside SAS through organic groups. This study provides further theoretical support for the application of BR in SAS.

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