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Efficient removal of malachite green dye onto nickel oxide-based adsorbent: experimental and theoretical approaches

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Abstract

Waterborne hazardous organic pollutants, including malachite green (MG) dye, remain a major environmental concern due to their detrimental effects on ecosystems and humans. In the present paper, the MG dye removal from aqueous solutions by nickel oxide (NiO) is investigated; used NiO has been prepared using the precipitation method. Structural characterization and properties of the adsorbent were performed via various physicochemical methods such as X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and N2 adsorption/desorption measurements. The results revealed that the maximum adsorption capacity and removal rate were 800 mg/g and about 99%, respectively. On the other hand, the adsorption kinetics follows the pseudo-second-order model. However, thermodynamics showed that: (i) ΔS° > 0 indicated an increase of disorder in the solid/liquid interface, (ii) ΔH° > 0 confirmed the endothermic nature of the adsorption process, and (iii) ΔG° < 0 demonstrated the spontaneous nature of MG adsorption. The calculated adsorption energies MCS/SAA EGas =  − 409.638 kcal and EAqueous =  − 416.856 kcal confirmed that the MG removal by adsorption on NiO is theoretically and experimentally favorable. In addition, MG molecules are adsorbed in a planar orientation on the NiO surface sites; the optimal interfacial contact is achieved. Finally, a mechanism was proposed to explain the adsorption of MG dye onto nickel oxide.

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Acknowledgements

The authors would like to thank Dr. Youness Abdellaoui the Universidad Autónoma de Yucatán, Mérida, Mexico. The work is supported by National Natural Science Foundation of China (52305103), Changsha Natural Science Foundation Project (kq2208025), Distinguished Young Scholars Fund of National Natural Science Foundation of China (52025082) and Key Support Project of National Natural Science Foundation of China - "Ye Qisun" Science Foundation (U2141242).

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All authors contributed to the conception and design of the study. The preparation of the material, data collection, and analysis were carried out by Y.D., Y.B., R.O., A.D., M.A.E.H., and I.A. The first version of the manuscript was written by Y.D., Y.B., R.O., A.D., M.A.E.H., I.A., B.E.I., R.C., Y.B., T.L., A.A., G.G-V., A.S., and E.C.L. All authors have commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Y. Dehmani.

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Editorial responsibility: Palanivel Sathishkumar.

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Dehmani, Y., Bengamra, Y., Aadnan, I. et al. Efficient removal of malachite green dye onto nickel oxide-based adsorbent: experimental and theoretical approaches. Int. J. Environ. Sci. Technol. 21, 3037–3052 (2024). https://doi.org/10.1007/s13762-023-05153-8

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  • DOI: https://doi.org/10.1007/s13762-023-05153-8

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