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Related Experiment Video

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Preparation of Expanded Chitin Foams and their Use in the Removal of Aqueous Copper

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Batch adsorption studies for chromium removal.

S Sivamani¹, V Prince Immanuel

¹Department of Biotechnology, Faculty of Engineering, Technology and Management Studies, Vinayaka Missions University, Periyaseeragapadi, Salem - 636 308, India. dr_sivamani@rediffmail.com

Journal of Environmental Science & Engineering

|February 6, 2009

Summary

Nitric acid treated pongamia leaf powder effectively removes hexavalent chromium (Cr (VI)) from water. This study optimized pH, contact time, and concentration for efficient chromium adsorption.

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Area of Science:

Environmental Science
Water Treatment
Adsorption Technology

Background:

Hexavalent chromium (Cr (VI)) is a toxic heavy metal pollutant.
Industrial wastewater poses a significant risk to aquatic ecosystems and human health.
Developing cost-effective adsorbents for Cr (VI) removal is crucial.

Purpose of the Study:

To investigate the adsorption of hexavalent chromium (Cr (VI)) using pongamia leaf powder.
To evaluate the efficacy of crude pongamia leaf powder (CPLP) and nitric acid treated pongamia leaf powder (APLP) as adsorbents.
To determine the optimal conditions for chromium removal.

Main Methods:

Crude pongamia leaf powder (CPLP) and nitric acid treated pongamia leaf powder (APLP) were prepared and used as adsorbents.
Batch adsorption experiments were conducted to study the effects of contact time, initial Cr (VI) concentration, and pH.
Adsorption data was analyzed using Langmuir and Freundlich isotherms.

Main Results:

APLP demonstrated significantly higher adsorption capacity and removal efficiency compared to CPLP.
Optimal Cr (VI) removal was achieved at pH 2.
The maximum adsorption was observed at a contact time of 165 minutes.
Effective adsorption occurred at an initial Cr (VI) concentration of 5 mg/L.
Adsorption followed both Langmuir and Freundlich isotherms, with a better fit for the Freundlich model for APLP.

Conclusions:

Nitric acid treatment enhances the adsorption performance of pongamia leaf powder for hexavalent chromium removal.
Pongamia leaf powder, particularly APLP, shows potential as an eco-friendly and efficient adsorbent for Cr (VI) remediation.
The study provides valuable insights into the adsorption mechanism and optimal conditions for chromium removal using biomass-derived adsorbents.