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Thiocyanate removal from aqueous solution by a synthetic hydrotalcite sol
Tao Wu1, Dejun Sun, Yujiang Li
1Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan 250100, People's Republic of China.
Journal of Colloid and Interface Science
|December 28, 2010
Summary
A novel synthetic hydrotalcite sol (LDHC) effectively removes thiocyanate from water. This adsorbent demonstrates high capacity and rapid adsorption, making it a promising solution for aqueous thiocyanate contamination.
Area of Science:
- Materials Science
- Environmental Chemistry
- Water Treatment
Background:
- Thiocyanate contamination in aqueous solutions poses environmental and health risks.
- Development of efficient adsorbents is crucial for effective thiocyanate removal.
- Synthetic hydrotalcites offer potential as novel adsorbent materials.
Purpose of the Study:
- To investigate the efficacy of chloride-containing synthetic hydrotalcite sol (LDHC) for adsorbing thiocyanate from aqueous solutions.
- To characterize LDHC and understand its adsorption mechanism, kinetics, and capacity.
- To evaluate the reusability of LDHC for sustainable water treatment.
Main Methods:
- LDHC synthesis via coprecipitation.
- Characterization using HRTEM, particle size analysis, XRD, and FTIR.
- Batch adsorption experiments to determine optimal pH, equilibrium time, and adsorption isotherms.
- Adsorption kinetics modeled using pseudo-second-order and equilibrium data fitted to the Langmuir equation.
Main Results:
- LDHC exhibited high efficiency in thiocyanate removal, attributed to its small particle size and high zeta potential.
- Optimal adsorption occurred at pH 4.0-8.0, reaching equilibrium within 150 minutes.
- The maximum adsorption capacity was 98.3 mg/g at 20°C, following Langmuir isotherm and pseudo-second-order kinetics.
- Regenerated LDHC using FeCl(3) solution demonstrated reusability over multiple cycles.
Conclusions:
- LDHC is a highly effective adsorbent for removing thiocyanate from aqueous solutions.
- Its favorable adsorption characteristics, including high capacity and rapid kinetics, position it as a viable alternative for water purification.
- The adsorbent's reusability enhances its potential for sustainable and cost-effective environmental applications.
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