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Published on: February 12, 2019
Comparative study on cadmium ion removal from acidic solutions using zeolites and bentonite
Joanna Kyziol-Komosinska1, Magdalena Pająk2, Agnieszka Dzieniszewska1
1Institute of Environmental Engineering, Polish Academy of Sciences, 41-819 Zabrze, 34 M. Skłodowskiej-Curie Street, Zabrze, Poland.
Synthetic Na-X zeolite effectively removes cadmium (II) from acidic wastewater. This study shows Na-X zeolite outperforms bentonite and clinoptilolite in adsorbing cadmium, offering a promising solution for environmental remediation.
Area of Science:
- Environmental Chemistry
- Materials Science
- Water Treatment
Background:
- Cadmium (II) contamination in wastewater poses significant environmental and health risks.
- Adsorption is a key technology for heavy metal removal from aqueous solutions.
- Zeolites, particularly synthetic Na-X zeolite, are explored for their ion-exchange and adsorption capabilities.
Purpose of the Study:
- To evaluate the adsorption performance of synthetic Na-X zeolite for Cadmium (II) removal.
- To compare Na-X zeolite with natural clinoptilolite and bentonite for Cadmium (II) adsorption.
- To investigate the influence of various parameters on Cadmium (II) adsorption kinetics and isotherms.
Main Methods:
- Batch adsorption experiments were conducted to study Cadmium (II) removal.
- Adsorption was investigated across varying contact times, pH levels, anion types (Cl⁻, SO₄²⁻), and initial Cadmium (II) concentrations.
- Adsorption data were fitted to isotherm (Freundlich, Langmuir, D-R, Sips) and kinetic (PFO, PSO) models.
Main Results:
- Na-X zeolite exhibited superior Cadmium (II) adsorption capacity (185-268 mg/g) compared to bentonite (97-136 mg/g) and clinoptilolite (55-68 mg/g).
- Optimal adsorption occurred at pH 5.0 with sulfate ions; lowest adsorption was at pH 3.0 with chloride ions.
- Pseudo-second-order kinetics best described Cadmium (II) adsorption across all tested conditions.
Conclusions:
- Synthetic Na-X zeolite is a highly effective adsorbent for Cadmium (II) removal from acidic wastewater.
- The adsorption process is influenced by pH and the presence of anions.
- Na-X zeolite demonstrates significant potential for practical environmental applications in heavy metal remediation.
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