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Use of Pistacia lentiscus leaves, after extraction of their oil, as a new biosorbent for the removal of dyes from water

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Abstract

The present study aimed primarily to demonstrate the potential use of mastic tree leaves from which the essential oils have been extracted to remove rhodamine B and ethyl violet from aqueous solutions through biosorption. Pistacia lentiscus (the mastic tree) is widespread in the Mediterranean region. Chemical characterization of the biosorbent was conducted by determining the pH at the point of zero charge and the surface functional groups present through the use of Boehm titration and Fourier-transform infrared spectroscopy. Physical characterization of the material was carried out by scanning electron microscopy, laser diffraction, and BET analysis. The results obtained showed that this material, which has good porosity, can be used as a biosorbent. The findings revealed that the biosorbent surface was slightly acid, with a predominance of phenolic groups. The effects of different parameters such as the contact time, initial dye concentration, biosorbent dosage, initial pH value, temperature, and ionic strength were all optimized. Both dyes (rhodamine B and ethyl violet) exhibited similar isotherm profiles that were type L according to the Brunauer–Emmett–Teller classification and type II according to the International Union of Pure and Applied Chemistry classification. The multilayer adsorption of both dyes was best described by the Freundlich isotherm model. In addition, the biosorption process was found to follow pseudo-second-order kinetics, and both reactions were thermodynamically spontaneous, with the biosorbent showing a remarkable affinity for the dyes. For ethyl violet, the adsorption yield was 88% and the adsorption capacity was 17 mg g−1 at equilibrium; however, for rhodamine B, the adsorption yield was 90% and the adsorption capacity was 9 mg g−1 at equilibrium.

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Correspondence to Fadia Khadoudja Bensenane Dhina.

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On behalf of all the authors, the corresponding author states that there is no conflict of interest.

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Responsible Editor: Mongi Seffen.

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Bensenane Dhina, F.K., Nassrallah, N., Choukchou-Braham, A. et al. Use of Pistacia lentiscus leaves, after extraction of their oil, as a new biosorbent for the removal of dyes from water. Euro-Mediterr J Environ Integr 6, 55 (2021). https://doi.org/10.1007/s41207-021-00255-6

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  • DOI: https://doi.org/10.1007/s41207-021-00255-6

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