The triple mechanisms of atenolol adsorption on ca-montmorillonite:Implication in pharmaceutical wastewater treatment

Chang, Po Hsiang and Jiang, Wei Teh and Sarkar, Binoy and Wang, Wendong and Li, Zhaohui (2019) The triple mechanisms of atenolol adsorption on ca-montmorillonite:Implication in pharmaceutical wastewater treatment. Materials, 12 (18). ISSN 1996-1944

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Abstract

The adsorption of atenolol (AT) from aqueous solutions by Ca-montmorillonite (SAz-2) was investigated in batch studies under different physicochemical conditions. The AT existed in neutral un-dissociated form at pH 10, and was adsorbed on dioctahedral smectite (SAz-2) obeying the Langmuir isotherm with a maximum adsorption capacity of 330 mmol/kg. The kinetic adsorption suggested that both strong and weak adsorption sites existed on SAz-2 and participated in the adsorption mechanisms. The amount of exchangeable cations desorbed from SAz-2 during AT adsorption was linearly correlated with the amounts of adsorbed AT having slopes of 0.43, which implied that a cation exchange based adsorption mechanism was also in place. A comprehensive basal spacing change of SAz-2 was observed after AT adsorption on the clay mineral when tested with or without AT recrystallization. The intercalation of AT into the SAz-2 interlayers did not result in swelling due to the low adsorption capacity of the drug. Prominent interactions between the pharmaceutical molecule and SAz-2 were evidenced by apparent shifts of the infrared absorption bands after adsorption. The interlayer configurations and hydrogen bonding of AT on SAz-2 were also supported by infrared, X-ray diffraction and thermogravimetric analyses. This study suggested that SAz-2 is an excellent material to remove not only AT from pharmaceutical wastewater, but can potentially remove many other β-receptor blocker drugs. The results helped us to understand the possible interlayer configurations and adsorption mechanisms of the drugs on natural clay mineral based adsorbents.

Item Type: Journal Article
Journal or Publication Title: Materials
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/2500
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 140126
Deposited By: ep_importer_pure
Deposited On: 14 Jan 2020 16:10
Refereed?: Yes
Published?: Published
Last Modified: 16 Feb 2020 05:29
URI: https://eprints.lancs.ac.uk/id/eprint/140126

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