On the adsorption/photodegradation of amoxicillin in aqueous solutions by an integrated photocatalytic adsorbent (IPCA): experimental studies and kinetics analysis

Basah, Shaik, Barr, Colin, Keane, David, Nolan, Kieran, Morrissey, Anne, Oelgemöller, Michael, and Tobin, John M. (2011) On the adsorption/photodegradation of amoxicillin in aqueous solutions by an integrated photocatalytic adsorbent (IPCA): experimental studies and kinetics analysis. Photochemical & Photobiological Sciences, 10 (6). pp. 1014-1022.

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Abstract

Activated carbon-supported TiO2 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 TiO2 loading and the highest adsorption was at 10 wt% TiO2 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 (Kad) was considerably higher than the photocatalytic rate constant (kL-H), indicating that the photocatalysis of AMO is the rate-determining step during the adsorption/photocatalysis process. The 10% IPCA exhibited excellent stability and reusability over four photodegradation cycles.

Item ID: 17413
Item Type: Article (Refereed Research - C1)
ISSN: 1474-905X
Date Deposited: 29 Jun 2011 06:20
FoR Codes: 03 CHEMICAL SCIENCES > 0303 Macromolecular and Materials Chemistry > 030306 Synthesis of Materials @ 30%
03 CHEMICAL SCIENCES > 0303 Macromolecular and Materials Chemistry > 030301 Chemical Characterisation of Materials @ 20%
03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030505 Physical Organic Chemistry @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 50%
97 EXPANDING KNOWLEDGE > 970105 Expanding Knowledge in the Environmental Sciences @ 50%
Citation Count from Web of Science Web of Science 2
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