Performance of organoclay in adsorptive uptake of antihypertensive losartan potassium: A comparative batch study using micro-grain activated carbon
| Autor: | Marcelino Luis Gimenes, M. G. A. Vieira, J.R. de Andrade, M. G. C. da Silva |
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| Rok vydání: | 2020 |
| Předmět: |
Losartan Potassium
Langmuir Chemistry Process Chemistry and Technology 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Pollution Adsorption Losartan Desorption medicine Chemical Engineering (miscellaneous) Organoclay Freundlich equation 0210 nano-technology Waste Management and Disposal 0105 earth and related environmental sciences Activated carbon medicine.drug Nuclear chemistry |
| Zdroj: | Journal of Environmental Chemical Engineering. 8:103562 |
| ISSN: | 2213-3437 |
| Popis: | The antihypertensive losartan potassium is an emerging pharmaceutical contaminant that has been traced in aquatic media; hence, up-to-date water treatment methods are urged. This paper is the first of its kind to examine losartan uptake by adsorption using an organophilic clay, Spectrogel. In comparison, a micro-grain activated carbon (μGAC) was employed. Adsorption kinetics, isotherms and thermodynamics were examined and characterizations were performed. Pseudo-first order, pseudo-second order, external diffusion, surface diffusion and pore diffusion models were adjusted to kinetic data, and Langmuir, Freundlich and Dubinin-Radushkevich models were correlated to isotherms. Adsorption mechanisms were elucidated for surface features and surface chemistry. The latter was unraveled to have a crucial role on losartan removal by Spectrogel. The best adsorbent dosage was stablished as 6 g/L and initial solution pH (2.5–10) had no significant impact on the process. Spectrogel exhibited faster kinetics and superior maximum adsorption capacity (∼2200 min, 0.0820 mmol/g) than μGAC (∼2600 min, 0.0441 mmol/g). Compared to water or ethanol eluents, methanol showed the highest efficiency as desorption agent (65%). The results indicate that Spectrogel organoclay is a potential non-traditional adsorbent for losartan remediation. |
| Databáze: | OpenAIRE |
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