University of Oulu

Bhairavi Doshi, Eveliina Repo, Juha P. Heiskanen, Juho Antti Sirviö, Mika Sillanpää, Sodium salt of oleoyl carboxymethyl chitosan: A sustainable adsorbent in the oil spill treatment, In Journal of Cleaner Production, 2017, , ISSN 0959-6526,

Sodium salt of oleoyl carboxymethyl chitosan : a sustainable adsorbent in the oil spill treatment

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Author: Doshi, Bhairavi1; Repo, Eveliina1; Heiskanen, Juha P.2;
Organizations: 1Laboratory of Green Chemistry, Lappeenranta University of Technology, Sammonkatu 12, Mikkeli, 50130, Finland
2Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 3000, FI-90014, Finland
3Fibre and Particle Engineering Research Unit, University of Oulu, P.O. Box 4300, FI-90014, Finland
4Department of Civil and Environmental Engineering, Florida International University, Miami, FL 33174, USA
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.1 MB)
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Language: English
Published: Elsevier, 2017
Publish Date: 2017-10-03


Spills due to the floating oil on the surface of sea water shows a significant alteration in the natural phenomenon of the marine ecosystem. Hence, amphiphilic sodium salt of oleoyl carboxymethyl chitosan (NaO-CMCS) was synthesized, characterized and studied as a sustainable adsorbent for the removal of floating oil in the oil spill treatment. Successful chemical modification of chitosan was confirmed by chemical analysis using Fourier Transform Infrared (FTIR), ¹H Nuclear Magnetic Resonance (¹H NMR), Scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDS) and Elemental Analyzer. The effect of pH and salinity on the surface charge of NaO-CMCS was studied. Marine diesel was chosen as an oil phase for the emulsion studies. Hydrophobically modified NaO-CMCS shows the oil-in-water (o/w) emulsion stability for more than 6 weeks with droplet size ≤ 30 μm which increases with decreasing temperature. The behavior of emulsion with different salinity shows phase separation at pH 5, bridging flocculation at pH 6–7 and o/w emulsion at pH 8. Calcium ions act as a cross-linker between two carboxylic acid groups of NaO-CMCS, enhancing the removal of oil from the creamy emulsion. The recovery of oil was 75–85% and 19–49% from deionized water and sea water, respectively. Oil was not chemically altered during the recovery, demonstrating the effectiveness of this derivative in the oil spill response for the removal and recovery of floating oil from the sea water.

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Series: Journal of cleaner production
ISSN: 0959-6526
ISSN-E: 1879-1786
ISSN-L: 0959-6526
Volume: 170
Pages: 339 - 350
DOI: 10.1016/j.jclepro.2017.09.163
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: This work was funded by the European Union Structural Funds.
Copyright information: © 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (