Continuous adsorptive removal of glimepiride using multi-walled carbon nanotubes in fixed-bed column
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RESEARCH ARTICLE
Continuous adsorptive removal of glimepiride using multi-walled carbon nanotubes in fixed-bed column Ismail Badran 1
&
Obada Qut 2 & Abdallah D. Manasrah 3,4
&
Murad Abualhasan 5
Received: 18 August 2020 / Accepted: 15 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Water pollution by emerging pollutants such as pharmaceutical and personal care products is one of today’s biggest challenges. The presence of these emerging contaminants in water has raised increasing concern due to their frequent appearance and persistence in the aquatic ecosystem and threat to health and safety. The antidiabetic drug glimepiride, GPD, is among these compounds, and it possesses adverse effects on human health if not carefully administered. Several conventional processes were proposed for the elimination of these persistent contaminants, and adsorption is among them. Therefore, in this study, the adsorptive removal of GPD from water using multi-walled carbon nanotubes (MWCNT) supported on silica was explored on a fixed-bed column. The effects of bed-height, solution pH, and flow rate on the adsorptive removal of GPD were investigated. The obtained adsorption parameters using Sips, Langmuir, and Freundlich models were used to investigate the continuous adsorption. The results showed that the drug removal is improved with the increasing bed height; however, it decreased with the flow rate. The effect of pH indicated that the adsorption is significantly affected and increased in acidic medium. The convection-dispersion model coupled with Freundlich isotherm was developed and used to describe the adsorption breakthrough curves. The maximum adsorption capacity (qm) was 275.3 mg/g, and the axial dispersion coefficients were ranged between 3.5 and 9.0 × 105 m2/s. The spent adsorbent was successfully regenerated at high pH by flushing with NaOH. Keywords Glimepiride . Continuous adsorption . Convection–dispersion model . Multi-walled CNT . Wastewater
Introduction Pharmaceuticals and personal care products (PPCP) are often considered one of the contemporary emerging pollutants. Such
man-made products are now present in water resources across the globe (Badran et al. 2020; Badran and Talie 2020; Bradley et al. 2016; Kibuye et al. 2019; Kot-Wasik et al. 2016; Li et al. 2016; Luo et al. 2014; Markiewicz et al. 2017). These
Responsible Editor: Ester Heath Highlights • Rapid and efficient removal of the antidiabetic drug glimepiride by MWCNT • The continuous adsorption breakthrough curve is described by a new convection–dispersion model. • The adsorption efficiency increases as the solution becomes more acidic, in agreement with the ZPC of the MWCNT, and the pKa of the drug. • The column bed was successfully regenerated through flushing with dilute NaOH. * Ismail Badran [email protected]
3
Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Street NW, Calgary, Alberta T2N 1N4, Canada
1
Department of Chemistry and Earth Sciences, Qatar University,
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