Application of response surface methodology for uranium(VI) adsorption using hydroxyapatite prepared from eggshells waste material: study of influencing factors and mechanism
| Autor: | Abdelhamid Mellah, Safir Ouassel, Salah Chegrouche, Djamel Nibou, Abderahmane Aknoun, Redouane Melikchi |
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| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
mechanism u(vi) chemistry.chemical_element 02 engineering and technology 010402 general chemistry Environmental technology. Sanitary engineering 01 natural sciences thermodynamics Egg Shell chemistry.chemical_compound Adsorption Spectroscopy Fourier Transform Infrared Animals Point of zero charge Fourier transform infrared spectroscopy Phosphoric acid TD1-1066 Water Science and Technology Aqueous solution hydroxyapatite Ammonium uranyl carbonate Hydrogen-Ion Concentration Uranium 021001 nanoscience & nanotechnology 0104 chemical sciences Kinetics Durapatite chemistry Chemisorption Female 0210 nano-technology Chickens Nuclear chemistry |
| Zdroj: | Water Science and Technology, Vol 83, Iss 5, Pp 1198-1216 (2021) |
| ISSN: | 1996-9732 0273-1223 |
| Popis: | Hydroxyapatite (HAp) was synthesized from biowaste hen eggshells by wet precipitation method in which calcium hydroxide and phosphoric acid were used as precursors. The effectiveness of uranium(VI) adsorption onto HAp was investigated by batch adsorption experiments from aqueous solutions. The obtained HAp powder was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectrometry, point of zero charge and Scanning electron microscope. The factors and levels used during the experiments were pH (2–5), adsorbent mass (0.01–0.05 g), and initial U(VI) concentration (100–310 mg L−1). A Box–Behnken design combined with analysis of variance was used to interpret the main effect influencing the adsorption. The results showed that pH was the most significant parameter affecting U(VI). The kinetic data correlates well with the pseudo-second-order model. The adsorption isotherms fitted the Langmuir-1 type model with the qmax = 175.22 mg g−1 at 25 °C. The calculated value of the mean free energy indicates the chemisorption process. Under optimal conditions, the uranium effluent derived from the precipitation of ammonium uranyl carbonate removal performance of 98% was achieved. This study proved that HAp prepared from eggshell was an ecofriendly and low-cost adsorbent and was very effective for the adsorption of U(VI) from aqueous solutions. |
| Databáze: | OpenAIRE |
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