This work focuses on the engineering of graphene oxide (GO) using multi-amine precursor to achieve a low-cost and effective adsorbent decorated with N-containing groups to adsorb mercury in water. Various characterization outcomes including X-ray photoelectron spectroscopy (XPS) analysis confirmed successful modification of the graphene composite using polyamine precursor with 5.47% N content recorded. The polyamine functionalized graphene composite demonstrated high affinity towards mercury in broad range of pH (pH 4-9) and rapid adsorption rate with equilibrium attained within the first 10 minutes. This material was found to follow Freundlich isotherm and pseudo-second order models with 63.8 mg/g sorption capacity. It also showed remarkable selectivity in both its dispersed (~86%) and solid forms (~79%) towards Hg(II) compared to existing commercial adsorbent (~16% in solid form ) in multimetallic solution. This material has also proven its outstanding outcome in regeneration test and mercury spiked natural waters environment which is promising for real remediation application. A low cost and effective polyamine functionalized graphene adsorbent has been successfully developed to mitigate mercury pollution issue. All the performance assessments exhibit potential conversion of this material for scalable application to remove mercury from the polluted waters.

Low cost polyamine-modified graphene composites for effective mercury remediation in water

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.