Removal and Recovery of Chromium from E-waste by Functionalized Wood Pulp: A Green Bio-hydrometallurgical Approach
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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.
Keywordsdl-Malic acid E-waste Wood pulp Chromium Pre-treatment step
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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