Optimization of oxytetracycline sorption onto iron modified montmorillonite

Mahmood M. Barbooti, Najah M. Alshuwaiki, Haiyan Su

Research output: Contribution to journalConference articlepeer-review

Abstract

Aims: Iraqi montmorillonite was saturated with iron (III) to investigate the improvement in the adsorption efficiency towards the antibiotics represented by oxytetracycline Methods Design of Experiments was carried out to determine the effect of experimental conditions: initial oxytetracycline molarity concentration (0.1-1.0 mM), montmorillonite content (0.5 - 10 g/L) and the pH value of the solution (3-10) on the adsorption efficiency. Batch equilibration runs were also conducted to study the adsorption of OTC in aqueous solutions onto the modified clay mineral powder for 24 hours. The UV absorption of the residual material at 360 nm was employed to determine the remaining oxytetracycline after equilibration for 24 hours. The iron introduction into montmorillonite resulted in enhancement of adsorption efficiency towards oxytetracycline which may be related to the possibility of stable complex with Fe(III) to make a 1:3 complex with it. Results: On using the optimum conditions, a mathematical model simulating the operation for the treatment was obtained as follows: Eff % =-0.467+0.160 m + 0.839Co +0.126 pH - 0.046 m.Co + 0.041 Co 2 - 0.071 Co.pH Experimentally the OTC concentration could be decreased from 0.5 down to 0.03 mM in synthetic wastewater at a pH value of 5.5 by sorption onto 6.85g.L-1 clay (montmorillonite)/L. Conclusion: The treatment with iron allows the use of lower clay material to perform the OTC removal.

Original languageEnglish
Article number012207
JournalIOP Conference Series: Materials Science and Engineering
Volume737
Issue number1
DOIs
StatePublished - 5 Mar 2020
Event4th International Conference on Buildings, Construction and Environmental Engineering, BCEE4 2019 - Istanbul, Turkey
Duration: 7 Oct 20199 Oct 2019

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