Journal
APPLIED CLAY SCIENCE
Volume 235, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.clay.2023.106879
Keywords
Adsorption; Emerging pollutants; Solid -phase extraction; Response surface methodology; Pillared clays
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Fixed-bed column studies were conducted to analyze the applicability of synthetic alumina pillared interlayered clays (Al-PILC) as sorbents for solid-phase extraction (SPE), specifically for triclosan (TCS) adsorption. The results showed that AI-PILC was effective in TCS adsorption for SPE, and the RSM-BDD model utilizing response surface methodology with a Box-Behnken design was successful in evaluating and optimizing the adsorption conditions for emerging contaminants in a fixed-bed column system.
Fixed-bed column studies are generally conducted to consider possible applications in water-purification processes. In this work, three synthetic alumina pillared interlayered clays (Al-PILC) were analyzed in fixed-bed column studies for use as sorbents for solid-phase extraction (SPE) for the first time. Adsorption processes were studied for triclosan (TCS), which is an emerging pollutant (EP) that has been shown to have several health effects. Breakthrough curves were investigated by varying process parameters such as bed height (0.25-0.75 cm), inlet TCS concentration (20-60 mg/cm(3)), and flow rate (0.5-3 cm(3)/min). Bohart-Adams, Bed Depth Service Time (BDST), and Thomas models were satisfactory applied to the results obtained for fixed-bed columns. The adsorption of TCS was successfully optimized for use in SPE for the three adsorbents studied using response surface methodology with a Box-Behnken design (RSM-BBD). The models developed were adequate for the experimental data (95% significance level), with high regression parameters (98.9-99.1). The optimum values for TCS adsorption on the fixed-bed column were 378.04, 367.78, and 378.93 mg (amount of adsorbent packed into the column), 0.5 cm(3)/min (flow rate), 4.24, 3.96, and 3.85 (pH), and 2.56, 1.93, and 1.13 mg/dm(3) (inlet TCS concentration) for Al-PILCAE, Al-PILCBE, and Al-PILCCM, respectively. From these results synthetic Al-PILC are effective and promising sorbents that can be used for analytical purposes in SPE, and that RSM-BDD is an effective and reliable tool for evaluating and optimizing the adsorption conditions for emerging contaminants in a fixed-bed column system.
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