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Combined adsorption and catalytic ozonation for removal of sulfamethoxazole using Fe(2)O3/CeO(2) loaded activated carbon

Akhtar, J. and Saidina Amin, Nor Aishah and Aris, Azmi (2011) Combined adsorption and catalytic ozonation for removal of sulfamethoxazole using Fe(2)O3/CeO(2) loaded activated carbon. Chemical Engineering Journal, 170 (1). pp. 136-144. ISSN 1385-8947

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Official URL: http://dx.doi.org/10.1016/j.cej.2011.03.043

Abstract

Treatment of sulfamethoxazole (SMX) in terms of total organic carbon (TOC) by combinedadsorption and catalyticozonation by commercial activatedcarbon (PAC) and Fe2O3/CeO2loadedactivatedcarbon (MOPAC) has been investigated. Adsorbent dosage of 2 g/L, initial pH ~ 6.5 and contact time = 50 min were found optimum for adsorption studies. Among various models, experimental data was well fitted by pseudo second-order model while Langmuir isotherm model represented equilibrium adsorption of SMX on both adsorbents. Adsorption of SMX was influenced by surface and intraparticle diffusion. The change in enthalpy (?H°) and entropy (?S°) for adsorption of SMX onto PAC and MOPAC were estimated as 105 kJ/mol and 396 J/mol K; and 21 kJ/mol and 131 J/mol K, respectively. The values of ?G° decreased slightly as a function of temperature that showed spontaneity of adsorption process. According to ozonation study, the removal of SMX was higher in MOPAC/O3 combination compared to PAC/O3 combination for low pH values. However, the effect of catalyst type was minimal at pH values of 7.5. Similarly, mechanism study suggested the enhancement in removal of SMX in the presence of MOPAC/O3 combination. Ozone consumption experiments also confirmed better consumption of ozone gas in case of MOPAC/O3 combination.

Item Type:Article
Uncontrolled Keywords:sulfamethoxazole, adsorption, ozonation, activated carbon, ozone consumption efficiency
Subjects:Q Science > QD Chemistry
Divisions:Chemical Engineering
ID Code:28836
Deposited By: Liza Porijo
Deposited On:29 Nov 2012 07:06
Last Modified:29 Nov 2012 07:06

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