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Volume 21, Issue 2
  • ISSN: 1573-4110
  • E-ISSN: 1875-6727

Abstract

Background

In recent years, low-cost biomaterials have been used for sustainable applications to reduce the impact of wastewater treatment. The preparation of bio-based materials with a strong affinity for chromate plays a crucial role in the adsorption process.

Methods

In this study, chitosan-halloysite nanotubes composite hydrogel beads (Ch-HNTs) were prepared for the removal of hexavalent chromium (Cr6+) from aqueous solutions. Ch-HNTs hydrogel beads were generated by incorporating HNTs into chitosan using a glutaraldehyde solution to achieve efficient crosslinking. The structure of the Ch-HNTs was characterized by SEM and FTIR analysis. These novel adsorbents were then tested for the adsorption of Cr6+ in serial batch experiments. For this purpose, the effect of pH, contact time, temperature, concentration of adsorbate, and adsorbent concentration on the extent of adsorption were investigated.

Results

The adsorption rate for Cr6+ was maximum at an initial pH of 2 in 60 minutes of contact time. The experimental data were fitted to Langmuir adsorption isotherm. The adsorption data were fitted to the Langmuir adsorption isotherm. The maximum adsorption capacity of 72.22 mg Cr6+/g for Ch-HNTs was obtained according to the Langmuir adsorption isotherm.

Conclusion

It is proposed that Ch-HNTs can be potential adsorbents for Cr6+ removal from dilute solutions. Nonetheless, further studies on adsorbing and removing various heavy metals using these novel beads in column systems can be planned.

© 2025 Bentham Science Publishers
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2025-02-01
2025-01-13

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/content/journals/cac/10.2174/0115734110336658240923070104
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Removal of Hexavalent Chromium (Cr6+) from Aqueous Solutions by Chitosan-halloysite Nanotubes Composite Hydrogel Beads
Current Analytical Chemistry 21, 165 (2025); https://doi.org/10.2174/0115734110336658240923070104
/content/journals/cac/10.2174/0115734110336658240923070104
/content/journals/cac/10.2174/0115734110336658240923070104
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  • Article Type:     Research Article
Keyword(s): Chitosan; clay; halloysite nanotubes; hexavalent chromium; hydrogel; wastewater treatment

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