A mechanistic insight into the shrinkage and swelling of Ca- montmorillonite upon adsorption of chain-like ranitidine in an aqueous system
Date
2023
Authors
Chang, P.H.
Mukhopadhyay, R.
Chen, C.Y.
Sarkar, B.
Li, J.
Tzou, Y.M.
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Journal article
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Journal of Colloid and Interface Science, 2023; 633:979-991
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Abstract
Adsorption behavior of ranitidine hydrochloride (RT) on a Ca-montmorillonite (SAz-1) was studied in aqueous system through batch experiments. The adsorption kinetics revealed that the equilibrium reached within 0.25 h and the data fitted well to the pseudo-second order kinetic equation (R2 = 0.98). The maximum RT adsorption capacity of SAz-1 was 369.2 mg/g and the adsorption isotherm data fol-lowed the Langmuir model (R2 = 0.99). The adsorption of RT and desorption of exchangeable cations from the clay mineral were linearly correlated, suggesting that cation exchange was the dominant mechanism of RT adsorption. The XRD examination of RT-adsorbed SAz-1 samples (unsaturated/saturated) after heat-ing enabled the calculation of RT occupied area in the interlayer of the clay mineral. The results suggested that adsorbed-RT at low loading rate could lay on the internal surfaces in a free style to reduce the basal spacing (d001 value) of SAz-1. When the RT loading rate was increased, a limited surface space enforced more RT molecules to lay in a tilted style and caused interlayer swelling of SAz-1 increasing the d001 value. The trend of rising decomposition temperature of RT with increasing RT loading rates confirmed intercalation of RT molecules in SAz-1. Infrared spectral analysis revealed the participation of amide and furan groups of RT in binding between RT and SAz-1. Thus, this study indicated that SAz-1 is an effi-cient adsorbent to remove RT from contaminated water, and the chain-like molecular structure of RT could cause an irregular change in the basal spacing of swelling type clay minerals. (c) 2022 Elsevier Inc. All rights reserved.
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Data source: Supplementary data, https://doi.org/10.1016/j.jcis.2022.11.104
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Copyright 2023 Elsevier
Access Condition Notes: Accepted manuscript available after 1 January 2025