Abstract
In this study, mercaptosuccinic acid capped CdSe nanocrystals were successfully synthesized and used as photocatalyst for the effective removal of methylene blue (MB) inaqueous solution under visible light and sunlight irradiations including its analysis with statistical physics theory. Dye adsorption properties of these nanocrystals were investigated via experimental kinetics and equilibrium studies. These experimental data were modeled via the application of statistical physics theory to explain the corresponding adsorption mechanism and to characterize the steric and energetic parameters involved in the dye removal. A maximum adsorption capacity of 27.07 mg g−1 (80% of dye removal) was observed in 10 min using an initial concentration of 30 mg L−1. Statistical physics calculations indicated that the adsorption energy was lower than 40 kJ mol−1. It was also established that the dye adsorption was associated to the electrostatic interactions and hydrogen bonding where dye aggregation and multi-molecular adsorption were expected. Overall, the dye removal was a spontaneous, feasible and exothermic. It was concluded that adsorption properties of CdSe-MSA nanocrystals improved the dye photo-catalytic degradation efficiency under visible light thus achieving up to 80% degradation efficiency in 60 min. The synergic effect of adsorption and photo-catalytic degradation performance was mainly due to the surface area (136.43 m2 g−1), small size (3.7 nm), and structural defects (selenium vacancies Se, interstitial of cadmium ICd) of CdSe nanocrystals, which enhanced both the response of these nanomaterials to visible light and their photo-catalytic activity. In summary, these nanocrystals are promising materials to be used in wastewater treatment under sunlight for the removal of organic compounds like dyes.
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Naim Bel Haj M: visualization, writing — review and editing, conceptualization, and methodology. SabriOuni: writing — original draft, visualization, conceptualization, and methodology. Mohamed bouzid: resources and writing — review and editing. Mohamed bouzidi: resources and writing — review and editing. Adrian Bonilla-Petriciolet: writing — reviewing and editing. Mohamed Haouari: Writing — reviewing and editing, visualization, and supervision.
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Bel Haj Mohamed, N., Ouni, S., Bouzid, M. et al. Synthesis and preparation of acid capped CdSe nanocrystals as successful adsorbent and photocatalyst for the removal of dyes from water and its statistical physics analysis. Environ Sci Pollut Res 29, 72747–72763 (2022). https://doi.org/10.1007/s11356-022-20990-9
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DOI: https://doi.org/10.1007/s11356-022-20990-9