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Sorption of metal ions from aqueous solution using bone char
1Department of Chemical Engineering, Hong Kong University of Science and Technology, Clear Water Bay Road, Kowloon, Hong Kong SAR, China.
Environment International
|July 19, 2005
Summary
Bone char effectively sorbs cadmium, copper, and zinc from water. Binary component studies revealed a displacement effect, impacting metal ion removal efficiency in fixed bed systems.
Area of Science:
- Environmental Science
- Materials Science
- Chemical Engineering
Background:
- Bone char is a promising adsorbent for heavy metal removal from aqueous solutions.
- Understanding sorption mechanisms and kinetics is crucial for effective wastewater treatment.
Purpose of the Study:
- To investigate the sorption capacity and kinetics of bone char for cadmium, copper, and zinc in single and binary systems.
- To analyze metal ion removal using equilibrium and mass transfer models.
- To evaluate bone char performance in fixed-bed column studies.
Main Methods:
- Equilibrium isotherm studies in single and binary component systems.
- Agitated batch adsorber studies to determine sorption rates.
- Analysis using single and multi-component equilibrium models.
- Fixed-bed column studies with diffusion mass transport modeling.
Main Results:
- Bone char exhibits significant sorption capacity for cadmium, copper, and zinc.
- Sorption kinetics are influenced by diffusion-controlled mechanisms.
- Binary component studies demonstrated a notable displacement effect on metal ion breakthrough curves.
Conclusions:
- Bone char is an effective adsorbent for removing cadmium, copper, and zinc from aqueous solutions.
- Diffusion plays a key role in the sorption rate.
- The displacement effect in binary systems is a critical factor for designing efficient removal processes.