Comparative study between static and dynamic adsorption efficiency of dyes by the mixture of palm waste using the central composite design

• Published in: Chemical Data Collections Vol. 27; p. 100385
• Main Authors: Azoulay, Karima, Bencheikh, Imane, Moufti, Ahmed, Dahchour, Abdelmalek, Mabrouki, Jamal, El Hajjaji, Souad
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2020
• Subjects: Central composite design (CCD); Dyes (MB and MO); Dynamic adsorption; Mixture of palm waste (MPW); Static adsorption; Dynamic adsorption; Mixture of palm waste (MPW); Dyes (MB and MO); Static adsorption; Central composite design (CCD)
• ISSN: 2405-8300; 2405-8300
• DOI: 10.1016/j.cdc.2020.100385

The present work was carried out to study the efficiency of the mixture of palm waste (MPW) (including (60% of date seeds (DS), 20% of palm's leaves (PL) and 20% of palm's bark (PB)) for the elimination of dyes (methylene blue (MB) and methyl orange (MO)) by the adsorption method. The adsorbent was characterized by the X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), pH points zero charge (pHpzc) and the specific surface area by the methylene blue method (SS). A central composite design (CCD) with three factors was used to optimize the experimental conditions. After realization of the experiment and data analysis, the optimal conditions are: 80 mg of adsorbents, 20 mg/L of initial dyes concentration and pH of adsorbate solution equal to 8.023 for MB with the removal efficiency of 93.4% and 90.38 mg of adsorbents, 20 mg/L of initial concentration dyes, and pH of adsorbate solution equal to 2 for MO adsorption with the removal efficiency of 46.6%. The results show that the kinetic modelisation of the MB and MO adsorption follows the pseudo-second-order model. The identification of retention mechanism by different models of adsorption isotherms (Freundlich, Langmuir, Dubini-Radushkevich and Timkin), indicate that the adsorption of the studied dyes follows the Langmuir model. The maximal quantities adsorbed of MB and MO are respectively 40.98 mg/g and 10.14 mg/g. The thermodynamic parameters show that the adsorption of MB and MO is spontaneous and exothermic for both dyes. The second part concerns the study of adsorption on a fixed-bed column which was applied to compare the efficiency of each system (static or dynamic) for the three studied supports. [Display omitted]