Photodegradation of famotidine by integrated photocatalytic adsorbent (IPCA) and kinetic study

Keane, David, Basha, Shaik, Nolan, Kieran, Morrissey, Anne, Oelgemöller, Michael, and Tobin, John M. (2011) Photodegradation of famotidine by integrated photocatalytic adsorbent (IPCA) and kinetic study. Catalysis Letters, 141 (2). pp. 300-308.

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Integrated photocatalytic adsorbents (IPCAs) comprised of nanocrystalline titanium dioxide (TiO2) and activated carbon (AC) were prepared using an ultrasonic impregnation technique. The IPCAs were characterised by scanning electron microscopy (SEM) and Fourier-transform infrared (FT-IR) spectroscopy and were employed as catalysts for the photodegradation of famotidine-an active pharmaceutical ingredient-in aqueous solutions using illumination from a 125 W medium pressure mercury lamp. The degradation kinetics were found to follow a pseudo-first-order rate law and varying TiO2 loadings induced different increases in the apparent first-order rate constant of the process. The kinetic behaviour can be described in terms of a modified Langmuir–Hinshelwood (LH) model. The IPCA prepared using a 10% TiO2 to AC loading exhibited the highest rate constant with a K C and k r of 0.0172 L/mg and 0.237 mg/L/min, respectively. The LH model fits the experimental data and elucidates the effect of the TiO2 content of the IPCA on the degradation rate. The use of calcination (heat treatment) in IPCA preparation and its effect on photocatalytic and adsorption performance were also investigated. The present work demonstrates that the combination of TiO2 and AC results in a promising material for application in the degradation of organic pollutants.

Item ID: 16782
Item Type: Article (Research - C1)
ISSN: 1572-879X
Keywords: titanium dioxide; activated carbon; integrated photocatalytic adsorbents; photocatalysis; famotidine
Date Deposited: 06 May 2011 08:51
FoR Codes: 03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030505 Physical Organic Chemistry @ 70%
03 CHEMICAL SCIENCES > 0303 Macromolecular and Materials Chemistry > 030306 Synthesis of Materials @ 30%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 50%
97 EXPANDING KNOWLEDGE > 970105 Expanding Knowledge in the Environmental Sciences @ 50%
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