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Oak (Quercus robur) acorn peel as a low-cost adsorbent for hexavalent chromium removal from aquatic ecosystems and industrial effluents

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dc.contributor.authorKuppusamy, S.
dc.contributor.authorThavamani, P.
dc.contributor.authorMegharaj, M.
dc.contributor.authorVenkateswarlu, K.
dc.contributor.authorLee, Y.B.
dc.contributor.authorNaidu, R.
dc.date.issued2016
dc.description.abstractThe efficiency of low-cost, abundantly available local forestry waste, oak (Quercus robur) acorn peel (OP), to remove toxic Cr(VI) from aqueous solutions was studied in a batch system as a function of contact time, adsorbate concentration, adsorbent dosage, and pH. In an equilibrium time of 420 min, the maximum Cr removal by OP at pH 2 and 10 was 100 and 97 %, respectively. The sorption data fitted well with Langmuir adsorption model. Evaluation using Langmuir expression presented a monolayer sorption capacity of 47.39 mg g-1 with an equilibrium sorbent dose of 5 g L-1 and pH 7. Uptake of Cr by OP was described by pseudo-second-order chemisorption model. ICP-OES, LC-ICPMS analysis of the aqueous and solid phases revealed that the mechanism of Cr(VI) removal is by 'integrated adsorption and reduction' mechanism. ESEM-EDX and XRD analysis of OP before and after adsorption also confirmed that both adsorption and reduction of Cr(VI) to less toxic Cr3+ forms followed by complexation onto the adsorbent surface contributed to the removal of Cr(VI). Consistent with batch studies, OP effectively removed (>95 %) Cr from the real water samples collected from lake and sea. The results of this study illustrate that OP could be an economical, green, and effective biomaterial for Cr(VI) removal from natural aquatic ecosystems and industrial effluents.
dc.identifier.citationWater, Air, and Soil Pollution, 2016; 227(2):1-11
dc.identifier.doi10.1007/s11270-016-2760-z
dc.identifier.issn0049-6979
dc.identifier.issn1573-2932
dc.identifier.urihttps://hdl.handle.net/11541.2/119194
dc.language.isoen
dc.publisherSpringer
dc.relation.fundingAustralian Government International Postgraduate Research Scholarship (IPRS)
dc.relation.fundingUniversity of South Australia (UniSA) International Postgraduate Research Scholarship (IPRS)
dc.relation.fundingCooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE) International Postgraduate Research Scholarship (IPRS)
dc.relation.fundingCooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE) CRC CARE top-up fellowship
dc.rightsCopyright 2016 Springer
dc.source.urihttps://doi.org/10.1007/s11270-016-2760-z
dc.subjectoak residue
dc.subjectbiosorption
dc.subjecthexavalent chromium
dc.subjectreduction
dc.subjecttrivalent chromium
dc.subjectwastewater treatment
dc.titleOak (Quercus robur) acorn peel as a low-cost adsorbent for hexavalent chromium removal from aquatic ecosystems and industrial effluents
dc.typeJournal article
pubs.publication-statusPublished
ror.mmsid9916069407001831

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