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Peptide-based gel in environmental remediation: removal of toxic organic dyes and hazardous Pb2+ and Cd2+ ions from wastewater and oil spill recovery

DOI: 10.1021/acs.langmuir.0c02205 DOI Help

Authors: Biplab Mondal (Indian Association for the Cultivation of Science) , Dipayan Bairagi (Indian Association for the Cultivation of Science) , Nibedita Nandi (Indian Association for the Cultivation of Science) , Biswanath Hansda (Indian Association for the Cultivation of Science) , Krishna Sundar Das (Indian Association for the Cultivation of Science) , Charlotte J. C. Edwards-gayle (University of Reading) , Valeria Castelletto (University of Reading) , Ian W. Hamley (University of Reading) , Arindam Banerjee (Indian Association for the Cultivation of Science)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Langmuir

State: Published (Approved)
Published: October 2020
Diamond Proposal Number(s): 17118

Abstract: A dipeptide-based synthetic amphiphile bearing a myristyl chain has been found to form hydrogels in the pH range 6.9–8.5 and organogels in various organic solvents including petroleum ether, diesel, kerosene, and petrol. These organogels and hydrogels have been thoroughly studied and characterized by different techniques including high-resolution transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, and rheology. It has been found that the xerogel obtained from the peptide gelator can trap various toxic organic dyes from wastewater efficiently. Moreover, the hydrogel has been used to remove toxic heavy metal ions Pb2+ and Cd2+ from wastewater. Dye adsorption kinetics has been studied, and it has been fitted by using the Freundlich isotherm equation. Interestingly, the gelator amphiphilic peptide gels fuel oil, kerosene, diesel, and petrol in a biphasic mixture of salt water and oil within a few seconds. This indicates that these gels not only may find application in oil spill recovery but also can be used to remove toxic organic dyes and hazardous toxic metal ions from wastewater. Moreover, the gelator can be recycled several times without significant loss of activity, suggesting the sustainability of this new gelator. This holds future promise for environmental remediation by using peptide-based gelators.

Journal Keywords: Dyes and pigments; Lipids; Adsorption; Ions; Hydrogels

Subject Areas: Chemistry, Environment

Instruments: B21-High Throughput SAXS