Preparation and characterization of biomaterial for phosphate ion removal: Kinetics, isotherms and thermodynamics studies
Phosphate ions are among the pollutants that pose a major risk to the environment and human health at high concentrations. The aim of this article is to evaluate the elimination capacity of these ions of the Carpobrotus edulis plant in its raw state and treated with (HCl, 0.5 M). Both biomaterials w...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-01-01
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| Series: | Desalination and Water Treatment |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1944398624000791 |
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| Summary: | Phosphate ions are among the pollutants that pose a major risk to the environment and human health at high concentrations. The aim of this article is to evaluate the elimination capacity of these ions of the Carpobrotus edulis plant in its raw state and treated with (HCl, 0.5 M). Both biomaterials were characterized by scanning electron microscopy coupled to an energy dispersive X-ray spectrometer (SEM-EDS), Fourier transform infrared spectroscopy (FT-IR), differential thermal analysis (DTA), and thermal gravimetric analysis (TGA). Retention power depends on several parameters, such as adsorbent mass, contact time, initial concentration, pH, and temperature. The acid treatment allows a reduction in soluble organic matter characterized by a decrease in BOD5 and COD of 30% and 70% respectively. For a fixed ratio of the order of 3.75 g.L−1 and an initial concentration of 1000 mg.L−1, phosphate ion removal percentages exceed 90%. The kinetics fit well with the pseudo-second-order model, and the results show strong agreement with the Langmuir isotherm. The maximum adsorption capacity of phosphate ions is 380.95 mg.g−1 for the plant native and 888.89 mg.g−1 in the modified state. The thermodynamics of adsorption are spontaneous and exothermic for plant native and endothermic for plant treated. |
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| ISSN: | 1944-3986 |