UV-induced photocatalytic degradation of aqueous acetaminophen: the role of adsorption and reaction kinetics

Basha, Shaik, Keane, David, Nolan, Kieran, Oelgemöller, Michael, Lawler, Jenny, Tobin, John M., and Morrissey, Anne (2015) UV-induced photocatalytic degradation of aqueous acetaminophen: the role of adsorption and reaction kinetics. Environmental Science and Pollution Research, 22 (3). 2219-2230 .

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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/photocatalysis process.

Item ID: 37263
Item Type: Article (Research - C1)
ISSN: 1614-7499
Keywords: adsorption; photocatalysis; kinetics; acetaminophen; integrated photocatalytic adsorbent
Funders: Irish Research Council for Science, Engineering and Technology (IRCSET), Central Salt and Marine Chemicals Research Institute (CSMCRI), Environmental Protection Agency (EPA) Ireland
Date Deposited: 10 Jun 2015 03:48
FoR Codes: 03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030505 Physical Organic Chemistry @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%
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