Simultaneous removals of cadmium(II) ions and reactive yellow 4 dye from aqueous solution by bone meal-derived apatite: kinetics, equilibrium and thermodynamic evaluations
| Autor: | Mopelola Idowu, Edwin Andrew Ofudje, Idowu Abideen Adeogun, Nelly A. Ndukwe, Sarafadeen Olateju Kareem |
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| Rok vydání: | 2020 |
| Předmět: |
Langmuir
Equilibrium Inorganic chemistry lcsh:Analytical chemistry General Physics and Astronomy 02 engineering and technology 010501 environmental sciences 01 natural sciences Endothermic process General Biochemistry Genetics and Molecular Biology Apatite lcsh:Chemistry symbols.namesake Adsorption General Materials Science Freundlich equation 0105 earth and related environmental sciences General Environmental Science lcsh:QD71-142 Aqueous solution Chemistry Langmuir adsorption model RY4 dye Sorption General Chemistry 021001 nanoscience & nanotechnology Kinetics lcsh:QD1-999 visual_art symbols visual_art.visual_art_medium 0210 nano-technology Cadmium |
| Zdroj: | Journal of Analytical Science and Technology, Vol 11, Iss 1, Pp 1-16 (2020) |
| ISSN: | 2093-3371 |
| DOI: | 10.1186/s40543-020-0206-0 |
| Popis: | The simultaneous removal of Cadmium ions and reactive yellow 4 dye (RY4 dye) by bone meal-derived apatite (BMDA) were investigated in a batch process. The structural elucidation of the prepared BMDA was done using TEM, XRD, FT-IR and EDX to evaluate the structures of the adsorbent. Different experimental features such as the agitation time, BMDA dosage, temperature, initial adsorbate concentration and pH of the solution were examined on the uptake pattern of the pollutants. The mechanism of adsorption was examined with Elovich, pseudo-first-order, intraparticle diffusion and pseudo-second-order kinetic models, while Langmuir, Dubinin-Radushkevich (D-R), Freundlich and Tempkin isotherms were exploited in order to describe the behaviour of the equilibrium process. Analysis from XRD revealed peaks corresponding to single phase apatite powder, while the various forces responsible for the interactions between the BMDA surface and the pollutants were obtained to CO32−, OH− and PO43− as observed by FT-IR analysis. SEM and TEM investigations confirmed a round-like morphology which agglomerated together upon the adsorption of pollutants.The kinetic modelling of the adsorption data were well illustrated with the pseudo-first-order model with correlation coefficient (R2) values ranging from 0.997 to 0.999. Isotherms studies revealed that best fit was achieved with Langmuir isotherm with adsorption capacities of 94.85 and 116.16 mg/g for RY4 dye and Cd(II) ions respectively. Thermodynamic study signified the uptake of the pollutants to be spontaneous, feasible and endothermic in nature. The values of entropy change (ΔS) for the sorption processes calculated are 86.57 and 60.16 J/mol/K for Cd(II) and RY4 dye, respectively. |
| Databáze: | OpenAIRE |
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