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Hibaaq Mohamud


Postgraduate Research Student

Academic and research departments

Department of Chemistry.

My publications

Publications

Mohamud Hibaaq, Van Es Elsje, Sainsbury T, Ivanov P, Russell B, Regan Patrick, Ward Neil (2017) Progress towards the development of a rapid analytical approach for
separation of 226Ra using dibenzo-18-crown-6 ether functionalised silica
(SiO2) disks,
Radiation Physics and Chemistry 140 pp. 57-60 Elsevier
A novel dibenzo-18-crown-6 ether (DB-18CE-6)- functionalised silica (SiO2) disk was found to be a capable
source preparation technique for the rapid analysis of 226Ra by alpha-spectrometry. DB-18CE-6 was chemically
immobilised onto the surface of SiO2 disks. It is anticipated that the high levels of selectivity of DB-18CE-6 for
radium will allow for an efficient chemical separation of 226Ra from other elements present in sample matrices.
226Ra was adsorbed as a monolayer onto the surface of the silica disks, attaching to the functionalised centres of
the DB-18CE-6 structure, forming a high resolution counting source for alpha-spectrometry. The chemical
recovery of radium from synthetic samples was 2.3% at pH 2, with higher recoveries expected over the pH range
of 4?10.
Mohamud H, Ivanov P, Russell B, Regan P, Ward N (2018) Selective sorption of uranium from aqueous solution by graphene oxide-modified materials, Journal of Radioanalytical and Nuclear Chemistry 316 (2) pp. 839-848 Springer Verlag
The effect of competing ions on the sorption behaviour of uranium onto carboxyl-functionalised graphene oxide (COOH-GO) were studied in batch experiments in comparison to graphene oxide (GO) and graphite. The effect of increasing the abundance of select chemical functional groups, such as carboxyl groups, on the selectivity of U sorption was investigated. In the course of the study, COOH-GO demonstrated superior performance as a sorbent material for the selective removal of uranyl ions from aqueous solution with a distribution coefficient of 3.72 ± 0.19 × 103 mL g?1 in comparison to 3.97 ± 0.5 × 102 and 2.68 ± 0.2 × 102 mL g?1 for GO and graphite, respectively.