Synthesis and development of Fe3O4/SiO2/CaCO3 nanocomposite adsorbents for ammonia adsorption in the shrimp pond waste
We developed a Fe3O4/SiO2/CaCO3 magnetic nanocomposite adsorbent, with SiO2 synthesized from sea sand and CaCO3 derived from coral skeletons. The Fe3O4/SiO2/CaCO3 nanocomposite was characterized and employed as an adsorbent to reduce ammonia levels in shrimp pond wastewater where ammonia concentrati...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIMS Press
2024-10-01
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| Series: | AIMS Environmental Science |
| Subjects: | |
| Online Access: | https://www.aimspress.com/article/doi/10.3934/environsci.2024044 |
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| Summary: | We developed a Fe3O4/SiO2/CaCO3 magnetic nanocomposite adsorbent, with SiO2 synthesized from sea sand and CaCO3 derived from coral skeletons. The Fe3O4/SiO2/CaCO3 nanocomposite was characterized and employed as an adsorbent to reduce ammonia levels in shrimp pond wastewater where ammonia concentrations ranged from 11.9 to 38.8 mg/L. We further explored the effects of various parameters on the removal efficiency, adsorption capacity, thermodynamics, isoterm, and kinetics of the adsorption process. Specifically, we examined the influence of pH (3–8), adsorbent mass (0.025–0.25 g), temperature (27–60 ℃), and contact time (10–120 min). Ammonia concentrations in the filtrate were measured using the Nessler method. The synthesis of CaCO3 from coral skeleton, SiO2 from sand, and Fe3O4/SiO2/CaCO3 adsorbent was successfully achieved, as confirmed by XRF, FTIR, and XRD characterizations. The adsorption process adhered to the second-order kinetics model, exhibited spontaneous behavior with a negative ΔG value, and followed the Langmuir isotherm model (R2 = 0.9267). The results indicated an optimal adsorbent mass of 0.025 g, achieving 89.3% adsorption at 60 minutes of contact time, a temperature of 27 ℃, and an optimal pH of 5. When applied to shrimp pond wastewater, the Fe3O4/SiO2/CaCO3 adsorbent demonstrated an adsorption efficiency ranging from 52.1% to 86.8% and an adsorption capacity between 6.2 and 30.9 mg/g. |
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| ISSN: | 2372-0352 |