Papers by Gillian Greenway
SiO2/RuO2 modified high surface area titania dioxide nanoparticles prepared by hydrogen reduction... more SiO2/RuO2 modified high surface area titania dioxide nanoparticles prepared by hydrogen reduction were examined for their catalytic properties towards the photodegradation of methyl orange (MO), a common water pollutant in the textile industry. The modified materials present enhanced photocatalytic activity and can decompose the MO faster than the unmodified TiO2. Results showed that doping with RuO2 only offered a marginal benefit over TiO2 alone. On the other hand, modification of TiO2with RuO2 and SiO2 resulted in a marked increase in the rate constant and the photodegradation efficiency. These results are consistent with the unique structural, morphologoical and surface characteristics of the composite titania dioxide/ruthenium dioxide/silicon dioxide materials. The lower the average particle size and roughness of the materials, the higher the percentage of photodecomposition and the rate constant. The surface doping and modification effects thus appears synergetic to the charge separation process and the photocatalytic results are explained on the basis of the mechanism that involves efficient separation of electron–hole pairs induced by the silicon dioxide particles. This enhances the ability of the modified TiO2 particles to effectively capture protons. Results also show that the modified nanoparticles can be used repeatedly over a long time without loss of efficiency.
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Chromated copper arsenate (CCA) is a common wood preservative that has been used worldwide. Studi... more Chromated copper arsenate (CCA) is a common wood preservative that has been used worldwide. Studies have shown that there are leaching risks of the preservative components arsenic, chromium and copper. These risks include contamination of soil and water, resulting in toxic effects to humans, animals, plants and ecosystems. This study investigates leaching of the preservative components following exposure of the wood waste as mulch to soil and water. Diffusive gradient in thin films (DGTs) were used to quantify leaching of potentially bioavailable/dissolved forms of the elements along the soil profile. Speciation of chromium was also carried out. All elements were found to leach out of the wood. The containers that included CCA-treated wood waste as a mulch leached higher levels of arsenic, chromium and copper than the controls. The distribution was highest in the top 5 cm of the soil profile and decreased with depth. DGTs proved to be a useful, novel technique for measuring in situ leaching and speciation from waste materials into the environment.
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Process Biochemistry, 2010
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We studied the nanotoxicity of titania nanoparticles (TiO2NPs) of various hydrodynamic diameters ... more We studied the nanotoxicity of titania nanoparticles (TiO2NPs) of various hydrodynamic diameters and crystallite sizes towards C. reinhardtii microalgae and S. cerevisiae (yeast) upon illumination with UV and visible light. The cell viability was assessed for a range of nanoparticle concentrations and incubation times. We found that bare TiO2NPs affect the C. reinhardtii cell viability at much lower particle concentrations than for yeast. We observed an increase of the TiO2NPs toxicity upon illumination with UV light compared with that in dark conditions due to the oxidative stress of the produced reactive oxygen species. We also found an increased TiO2NPs nanotoxicity upon illumination with visible light which indicates that they may also interfere with the microalgae's photosynthetic system leading to decreased chlorophyll content upon exposure to TiO2NPs. The results indicate that the larger the hydrodynamic diameter of the TiO2NPs the lower is their nanotoxicity, with anatas...
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Analytical Communications, 1996
ABSTRACT
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Analytical Communications, 1996
Page 1. Analytical Communications, May 1996, Vol33 ( I 71-1 74) 171 Elect rogenerated Chem il urn... more Page 1. Analytical Communications, May 1996, Vol33 ( I 71-1 74) 171 Elect rogenerated Chem il urn inescence Determination of Some Local Anaesthetics Andrew W. Knight and Gillian M. Greenway School of Chemistry, University of Hull, Hull, North Humberside, UK HU6 7RX ...
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Microreaction Technology: Industrial Prospects, 2000
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Micro Total Analysis Systems 2000, 2000
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Hydrology and Earth System Sciences Discussions, 2012
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Micro Total Analysis Systems 2002, 2002
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Bongkot Ngamsom 1, Leanne Marle 1, Paul Watts 1, Gillian M. Greenway 1, Tom McCreedy 1, Anne Mari... more Bongkot Ngamsom 1, Leanne Marle 1, Paul Watts 1, Gillian M. Greenway 1, Tom McCreedy 1, Anne Marie Hickey 2, and Jennifer A. Littlechild 2.(1) Department of Chemistry, University of Hull, Cottingham Road, Hull, HU6 7RX, United Kingdom,(2) Henry Wellcome Building ...
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ABSTRACT We present results from in vitro flask and flume experiments using freshwater biofilms s... more ABSTRACT We present results from in vitro flask and flume experiments using freshwater biofilms sourced and cultivated from a mine-impacted stream in North Yorkshire, UK. Flask experiments showed rapid uptake of Zn from the water column into biofilms. This uptake was not light dependant and suggests that chelation of Zn by negatively charged functional groups in extracellular polymeric substances (EPS) secreted within the biofilm are the key sink for Zn. Solid state analysis of the biofilm from the mesocosm system by scanning electron microscopy highlights the presence of calcite precipitates within the EPS, which may provide another sink for Zn. Long-term monitoring of flume systems showed area-adjusted removal rates of ~0.2 g Zn m-2 day-1, which is consistent with many other biologically-mediated mine water treatment systems. Diel (24 h) fluctuations in pH and Zn were observed over a 96 h intensive sampling period in the flumes. Practical considerations for establishing and maintaining biofilms under controlled conditions are also highlighted; these include regulation of light intensity and maintenance of flowing, low nutrient status waters.
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Papers by Gillian Greenway