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Arsenic removal using a biopolymer chitosan sorbent.
Chiing-Chang Chen1, Ying-Chien Chung
1Department of General Studies, National Taichung Nursing College, Taichung, Taiwan, ROC.
Summary
Chitosan beads effectively remove arsenic(V) from water, with optimal performance near pH 5. This agricultural waste derivative shows promise for arsenic remediation in both batch and continuous systems, offering efficient regeneration and reuse.
Area of Science:
- Environmental Science
- Materials Science
- Chemical Engineering
Background:
- Arsenic contamination in water poses significant health risks.
- Agricultural waste valorization is crucial for sustainable practices.
- Chitosan is a biodegradable biopolymer with potential adsorbent properties.
Purpose of the Study:
- To assess the efficacy of chitosan beads for removing arsenic(III) and arsenic(V) from water.
- To investigate the performance of chitosan beads in batch and continuous flow systems.
- To evaluate arsenic recovery and chitosan bead reusability.
Main Methods:
- Batch adsorption experiments varying pH, temperature, coexisting ions, and initial arsenic concentrations.
- Continuous flow column studies using actual industrial wastewater.
- Kinetic adsorption analysis and desorption studies for arsenic recovery.
Main Results:
- Chitosan beads demonstrated higher adsorption for arsenic(V) compared to arsenic(III).
- Optimal pH for arsenic removal was found to be near 5.
- Effective regeneration and reuse of chitosan beads for at least 15 cycles were achieved.
- Successful arsenic removal from real industrial wastewater in a continuous system.
Conclusions:
- Chitosan beads are a promising, cost-effective material for arsenic remediation from water.
- The material's reusability and effectiveness in continuous systems highlight its practical applicability.
- Further research into optimizing chitosan bead properties for arsenic(III) removal is warranted.