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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 4, 2015, pp. 1461-1478
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Bioline Code: st15136
Full paper language: English
Document type: Review Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 4, 2015, pp. 1461-1478
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Regeneration of adsorbents and recovery of heavy metals: a review
Lata, S.; Singh, P.K. & Samadder, S.R.
Abstract
In last a few decades, significant improvements
were made in both efficiency and economy for removal of
heavy metals and metalloid (arsenic) from water using
adsorbents. But less attention was paid to recycling of used
adsorbents and recovery of the heavy metals from the
desorbing agents. For regeneration and reuse of adsorbents,
various possible regenerating agents such as acids, alkalis
and chelating agents (such as ethylene diamine tetraacetic
acid) were used by many researchers with very limited
success in some of the studies only up to a limited number
of adsorption–desorption cycles. Only a few of the reported
studies were focused on recovery of adsorbed (from saturated
adsorbents) and desorbed metals (from regenerating
agents). Though the management of the used adsorbent and
recovery of heavy metals is one of the most important
aspects, but only a limited number of research works
considered the fate of spent adsorbents before disposal.
This review summarizes the removal efficiency of various
adsorbents, desorption efficiency of various regenerating
agents and recovery of the heavy metals from both saturated
adsorbents and desorbing solvents used for regeneration.
The study will help the scientific community
working on adsorption studies to take up research initiatives
required to address the feasible recovery methods of
heavy metals from the used adsorbents, to study the possible
reuse of the desorbing agents and to choose a suitable
desorbing/regenerating agent for a particular adsorbent.
Keywords
Adsorbent; Adsorption; Desorption; Heavy metals; Recovery; Regeneration
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