Author
Onuma Carmody
Bio: Onuma Carmody is an academic researcher from Queensland University of Technology. The author has contributed to research in topics: Raman spectroscopy & Uranyl. The author has an hindex of 10, co-authored 16 publications receiving 1508 citations.
Topics: Raman spectroscopy, Uranyl, Adsorption, Infrared spectroscopy, Grinding
Papers
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TL;DR: In this paper, the synthesis and absorbing properties of a wide variety of porous sorbent materials have been studied for application in the removal of organics, particularly in the area of oil spill cleanup.
Abstract: This paper reviews the synthesis and the absorbing properties of the wide variety of porous sorbent materials that have been studied for application in the removal of organics, particularly in the area of oil spill cleanup. The discussion is especially focused on hydrophobic silica aerogels, zeolites, organoclays and natural sorbents many of which have been demonstrated to exhibit (or show potential to exhibit) excellent oil absorption properties. The areas for further development of some of these materials are identified.
987 citations
TL;DR: The use of organo-clays for cleaning up oil spills is feasible due to its many desirable properties such as high hydrocarbon sorption and retention capacities, hydrophobicity, and recyclability.
216 citations
TL;DR: The Raman spectra of the vanadates in the low wavenumber region are complex with multiple overlapping bands which are probably due to VO subunits and MO bonds.
116 citations
TL;DR: The main adsorption mechanism for these sorbents occurred on the external surface of the material in the pores or capillaries as mentioned in this paper, where hydrophobic and oleophilic properties are essential.
115 citations
TL;DR: The molecular structure of the mineral andersonite, a uranyl tricarbonates, has been studied by Raman microscopy at 298 and 77 K and ATR infrared spectroscopy.
70 citations
Cited by
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TL;DR: In this article, a detailed analysis of the thermal expansion mechanism of graphite oxide to produce functionalized graphene sheets is provided, where it is shown that the decomposition rate of the epoxy and hydroxyl sites exceeds the diffusion rate of evolved gases, yielding pressures that exceed the van der Waals forces holding the graphene sheets together.
Abstract: A detailed analysis of the thermal expansion mechanism of graphite oxide to produce functionalized graphene sheets is provided. Exfoliation takes place when the decomposition rate of the epoxy and hydroxyl sites of graphite oxide exceeds the diffusion rate of the evolved gases, thus yielding pressures that exceed the van der Waals forces holding the graphene sheets together. A comparison of the Arrhenius dependence of the reaction rate against the calculated diffusion coefficient based on Knudsen diffusion suggests a critical temperature of 550 °C which must be exceeded for exfoliation to occur. As a result of their wrinkled nature, the functionalized and defective graphene sheets do not collapse back to graphite oxide but are highly agglomerated. After dispersion by ultrasonication in appropriate solvents, statistical analysis by atomic force microscopy shows that 80% of the observed flakes are single sheets.
3,340 citations
TL;DR: From a comprehensive literature review, it was found that some LCAs, in addition to having wide availability, have fast kinetics and appreciable adsorption capacities too.
3,163 citations
1,432 citations
TL;DR: A classification scheme and a comprehensive literature review are presented in order to uncover, classify, and interpret the current research on PROMETHEE methodologies and applications.
1,325 citations
TL;DR: This work presents a self-assembly method for constructing thermally stable, free-standing nanowire membranes that exhibit controlled wetting behaviour ranging from superhydrophilic tosuperhydrophobic, and suggests an innovative material that should find practical applications in the removal of organics, particularly in the field of oil spill cleanup.
Abstract: The construction of nanoporous membranes is of great technological importance for various applications, including catalyst supports, filters for biomolecule purification, environmental remediation and seawater desalination. A major challenge is the scalable fabrication of membranes with the desirable combination of good thermal stability, high selectivity and excellent recyclability. Here we present a self-assembly method for constructing thermally stable, free-standing nanowire membranes that exhibit controlled wetting behaviour ranging from superhydrophilic to superhydrophobic. These membranes can selectively absorb oils up to 20 times the material's weight in preference to water, through a combination of superhydrophobicity and capillary action. Moreover, the nanowires that form the membrane structure can be re-suspended in solutions and subsequently re-form the original paper-like morphology over many cycles. Our results suggest an innovative material that should find practical applications in the removal of organics, particularly in the field of oil spill cleanup.
1,012 citations