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Modified Oyster Waste Shells as a Value-Added Sorbent for Lead Removal from Water
1Department of Environmental Engineering & Biotechnology, Mokpo National Maritime University, 91 Haeyangdaehak-ro, Mokpo, 58628, South Korea.
Bulletin of Environmental Contamination and Toxicology
|March 11, 2021
Summary
Modified oyster shells effectively remove lead from water. Phosphoric acid treatment enhances oyster shell sorption capabilities, offering a sustainable solution for lead contamination.
Area of Science:
- Environmental Chemistry
- Materials Science
- Waste Management
Background:
- Used oyster shells are a significant waste stream from the seafood industry.
- Developing effective sorbent materials from waste products is crucial for environmental remediation.
- Lead contamination in water poses serious health risks, necessitating efficient removal methods.
Purpose of the Study:
- To investigate the potential of modified oyster shells as sorbents for lead removal from water.
- To compare the lead sorption efficiency of phosphoric-acid treated oyster shell (POS) and oyster shells with phosphoric acid (OS + P) against unmodified oyster shells (OS).
Main Methods:
- Oyster shells were modified using phosphoric acid (POS and OS + P).
- X-ray Diffraction (XRD) was used to confirm the formation of calcium phosphate.
- Batch sorption experiments were conducted to evaluate lead removal efficiency.
- Sorption data were analyzed using Freundlich isotherms and pseudo-second-order kinetic models.
Main Results:
- XRD analysis confirmed the presence of calcium phosphate in modified oyster shells.
- Lead removal efficiency followed the order: OS + P > POS > OS.
- Freundlich isotherms (R² > 0.98) indicated stronger lead sorption by POS and OS + P.
- Pseudo-second-order kinetics accurately described the sorption process for all sorbents.
Conclusions:
- Modified oyster shells, particularly OS + P and POS, are effective sorbents for lead removal from water.
- Utilizing waste oyster shells presents a sustainable and cost-effective approach to mitigating lead pollution.
- The findings support the application of these modified oyster shells in water treatment technologies.
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