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National Academy Science Letters

, Volume 42, Issue 2, pp 99–103 | Cite as

Removal and Recovery of Chromium from E-waste by Functionalized Wood Pulp: A Green Bio-hydrometallurgical Approach

  • Shilpa Varshney
  • Priyanka Jain
  • Shalini SrivastavaEmail author
Short Communication
  • 44 Downloads

Abstract

Functionalized wood pulp (WP-g-GMA-d-GluN+) as biosorbent and dl-malic acid–hydrogen peroxide as leaching agent was used for the recovery of chromium [Cr(VI)] from e-waste (waste floppy disks) in this study. Presence of N-content in WP-g-GMA-d-GluN+ (8.013%), relative to pristine wood pulp, was achieved by C–H–N elemental analysis. Functionalized biosorbent was characterized through standard analytical tools (Fourier transform infrared spectroscopy, scanning electron microscopy, and thermo-gravimetric analysis). Cr(VI) concentration in leachate before and after uptake was measured by atomic absorption and UV–VIS spectrophotometer. Maximum Cr(VI) recovery from floppy disks was found to be 98.25%; 24.5625 mg g−1 at room temperature for an initial Cr(VI) concentration of 25 mg l−1 at pH 2.5. Organic acid regeneration was tried for several cycles with a view to recover the sorbed Cr(VI) and also to restore the biosorbent to its original state. The successful application of easily abundant wood pulp as a biosorbent has potential for a low technological pre-treatment step prior to economically not-viable, high-tech chemical treatments for the removal of Cr(VI) from e-waste.

Keywords

dl-Malic acid E-waste Wood pulp Chromium Pre-treatment step 

Notes

Acknowledgements

Authors are thankful to Director, Prof. P.K. Kalra, Dayalbagh Educational Institute, Dayalbagh, Agra, for providing necessary research facilities. Shilpa Varshney is grateful to Council of Scientific and Industrial Research, New Delhi, India, for rendering financial assistance (Grant No. 09/607(0040)2014-EMR-I). Prof. M.M. Srivastava, Department of Chemistry, Dayalbagh Educational Institute, is gratefully acknowledged for fruitful scientific discussions.

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Copyright information

© The National Academy of Sciences, India 2018

Authors and Affiliations

  • Shilpa Varshney
    • 1
  • Priyanka Jain
    • 1
  • Shalini Srivastava
    • 1
    Email author
  1. 1.Department of Chemistry, Faculty of ScienceDayalbagh Educational InstituteAgraIndia

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