Adsorption of pharmaceutical residues on adsorbents prepared from olive stones using mixture design of experiments model

In this work, inexpensive and easily available olive stone (OS) waste was used as the source material to prepare activated carbons (ACs) by chemical activation with phosphoric acid and zinc chloride. The mixture design of experiments (MDOE) method was applied to study the effect of the composition o...

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Bibliographic Details
Published in:Water science and technology 2019-09, Vol.80 (5), p.998-1009
Main Authors: Boudrahem, F, Yahiaoui, I, Saidi, S, Yahiaoui, K, Kaabache, L, Zennache, M, Aissani-Benissad, F
Format: Article
Language:English
Subjects:
Activated carbon
Adsorbents
Adsorption
Amoxicillin
Antibiotics
Aqueous solutions
Cellulose
Charcoal
Composition effects
Design of experiments
Kinetics
Lignin
Olea
Organic chemistry
Pharmaceuticals
Phosphoric acid
Pollutants
Raw materials
Residues
Sulfamethazine
Water Pollutants, Chemical
Zinc
Zinc chloride
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Summary:In this work, inexpensive and easily available olive stone (OS) waste was used as the source material to prepare activated carbons (ACs) by chemical activation with phosphoric acid and zinc chloride. The mixture design of experiments (MDOE) method was applied to study the effect of the composition of the mixture of unmodified olive stones (UOS) and ACs prepared from olive stones activated with ZnCl (ACOS ZnCl ) and H PO (ACOS H PO ) on the absorption of pharmaceutical residues. The adsorbed tetracycline (TC) amounts at equilibrium predicted from the model equation developed using Microsoft Excel were found to be in good agreement with the experimental values (R = 0.999). Based on the results of the model, the amount of TC removed increased as the proportion of ACOS H PO in the adsorbent mixture increased and the highest amount of TC adsorbed was obtained with an adsorbent made up entirely of ACOS H PO . Separate adsorption tests for sulfamethazine (SMT) and amoxicillin (AMX) on ACOS H PO showed that SMT was adsorbed best (189.81 mg/g), followed by TC (183.11 mg/g) then AMX (155.69 mg/g). However, when these molecules were present together in the same solution, it was TC that adsorbed best, followed by SMT then AMX. In addition to this, the sorption process studied was best described by a pseudo-first-order model and it was the Langmuir model that satisfactorily described the equilibrium data.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2019.346