ORCID Profile
0000-0002-7748-9452
Current Organisations
Dublin City University
,
York University
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Publisher: Springer Science and Business Media LLC
Date: 06-2012
Publisher: Informa UK Limited
Date: 15-11-2011
Publisher: American Chemical Society (ACS)
Date: 17-11-2010
DOI: 10.1021/IE101304A
Publisher: Springer Science and Business Media LLC
Date: 17-11-2010
Publisher: Springer Science and Business Media LLC
Date: 31-08-2014
DOI: 10.1007/S11356-014-3411-9
Abstract: Nanostructured titania supported on activated carbon (AC), termed as integrated photocatalytic adsorbents (IPCAs), were prepared by ultrasonication and investigated for the photocatalytic degradation of acetaminophen (AMP), a common analgesic and antipyretic drug. The IPCAs showed high affinity towards AMP (in dark adsorption studies), with the amount adsorbed proportional to the TiO2 content the highest adsorption was at 10 wt% TiO2. Equilibrium isotherm studies showed that the adsorption followed the Langmuir model, indicating the dependence of the reaction on an initial adsorption step, with maximum adsorption capacity of 28.4 mg/g for 10 % TiO2 IPCA. The effects of initial pH, catalyst amount and initial AMP concentration on the photocatalytic degradation rates were studied. Generally, the AMP photodegradation activity of the IPCAs was better than that of bare TiO2. Kinetic studies on the photocatalytic degradation of AMP under UV suggest that the degradation followed Langmuir-Hinshelwood (L-H) kinetics, with an adsorption rate constant (K) that was considerably higher than the photocatalytic rate constant (k r), indicating that the photocatalysis of AMP is the rate-determining step during the adsorption hotocatalysis process.
Publisher: Springer Science and Business Media LLC
Date: 06-2011
DOI: 10.1039/C0PP00368A
Abstract: Activated carbon-supported TiO(2) nanoparticles, termed integrated photocatalytic adsorbents (IPCAs), were prepared using an ultrasonic impregnation technique and investigated for the photocatalytic degradation of amoxicillin (AMO), a β-lactam antibiotic. The IPCAs had high adsorption affinity for AMO with the amount adsorbed proportional to the TiO(2) loading and the highest adsorption was at 10 wt% TiO(2) loading. A pseudo-second-order model was found to fit the experimental data and consistently predicted the amount of AMO adsorbed over the adsorption period. Equilibrium isotherm studies showed that the adsorption followed the Redlich-Peterson model with maximum adsorption capacity of 441.3 mg g(-1) for 10% IPCA, 23% higher than the pure activated carbon (AC). Kinetic studies on the photocatalytic degradation of AMO using non-linear regression analysis suggest that the degradation followed Langmuir-Hinshelwood (L-H) kinetics. The adsorption rate constant (K(ad)) was considerably higher than the photocatalytic rate constant (k(L-H)), indicating that the photocatalysis of AMO is the rate-determining step during the adsorption hotocatalysis process. The 10% IPCA exhibited excellent stability and reusability over four photodegradation cycles.
Publisher: Springer Science and Business Media LLC
Date: 12-2010
DOI: 10.1039/C0PP00223B
Abstract: The DMBP-sensitized addition of isopropanol to furanones was studied in a novel LED-driven microchip reactor. Complete conversions were achieved after just 2.5 to 5 min of irradiation with 6 × 365 nm high-power LEDs. The results were compared to analogous experiments using a conventional batch reactor.
Publisher: American Chemical Society (ACS)
Date: 14-10-2010
DOI: 10.1021/OL102184U
Abstract: A series of acetone-sensitized photodecarboxylation reactions involving phthalimides have been investigated using conventional and microphotochemistry. Both, intra- and intermolecular transformations were compared. In all cases examined, the reactions performed in microreactors were superior in terms of conversions or isolated yields. These findings unambiguously prove the advantage of microphotochemistry over conventional photochemical techniques.
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2GC16439F
Publisher: American Chemical Society (ACS)
Date: 20-08-2012
DOI: 10.1021/OL301773R
Abstract: A novel, multimicrocapillary flow reactor (MμCFR) was constructed and applied to a series of sensitized photoadditions involving 2(5H)-furanones. The reactor allowed for rapid and energy-, time-, and space-efficient sensitizer screening, process optimization, validation, scale-up, and library synthesis.
Publisher: Georg Thieme Verlag KG
Date: 12-08-2010
Publisher: Elsevier BV
Date: 2011
Publisher: Beilstein Institut
Date: 02-08-2011
DOI: 10.3762/BJOC.7.121
Abstract: A series of 4,4'-dimethoxybenzophenone mediated intra- and intermolecular photodecarboxylation reactions involving phthalimides have been examined under microflow conditions. Conversion rates, isolated yields and chemoselectivities were compared to analogous reactions in a batch photoreactor. In all cases investigated, the microreactions gave superior results thus proving the superiority of microphotochemistry over conventional technologies.
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C004869K
Publisher: Elsevier BV
Date: 05-2012
Publisher: Springer Science and Business Media LLC
Date: 09-2011
DOI: 10.1039/C1PP05024A
Abstract: Three types of micro-photoreactor setups were investigated using DMBP-sensitized additions of isopropanol to furanones as model reactions. The results were compared to experiments using a conventional batch reactor. Based on conversion rates, reactor geometries and energy efficiency calculations the microsystems showed superior performances over the batch process. Of the three micro setups examined, the LED-driven microchip gave the best overall results.
No related grants have been discovered for Kieran Nolan.