(2017) Enhancement of the adsorption capacity of the light-weight expanded clay aggregate surface for the metronidazole antibiotic by coating with MgO nanoparticles: Studies on the kinetic, isotherm, and effects of environmental parameters. Chemosphere.
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Abstract
The synthesized MgO nanoparticles were used to coat the light-weight expanded clay aggregates (LECA) and as a metronidazole (MNZ) adsorbent. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Fourier-transformed infrared (FTIR) techniques were employed to study the surface morphology and characteristics of the adsorbents. MgO/LECA clearly revealed the advantages of the nanocomposite particles, showing high specific surface area (76.12 m2/g), significant adsorption sites and functional groups. Between pH 5 and 9, the MNZ sorption was not significantly affected. Kinetic studies revealed that the MNZ adsorption closely followed the Avrami model, with no dominant process controlling the sorption rate. The study of the effects of foreign ions revealed that the addition of carbonate raised the MNZ removal efficiency of LECA by 8 and the total removal of MNZ by MgO/LECA. Furthermore, nitrate and hardness only marginally influenced the MNZ removal efficiency and their effects can be ranked in the order of carbonate>nitrate>hardness. The isotherm adsorption of MNZ was best fitted with the Langmuir model enlighten the monolayer MNZ adsorption on the homogeneous LECA and MgO/LECA surfaces. The maximum adsorption capacity under optimum conditions was enhanced from 56.31 to 84.55 mg/g for LECA and MgO/LECA, respectively. These findings demonstrated that the MgO/LECA nanocomposite showed potential as an efficient adsorbent for MNZ removal. © 2017 Elsevier Ltd
Item Type: | Article |
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Keywords: | Adsorbents; Adsorption isotherms; Aggregates; Efficiency; Electron microscopy; Fourier transform infrared spectroscopy; Hardness; High resolution transmission electron microscopy; Isotherms; Kinetics; Magnesia; Nanocomposites; Nanoparticles; Nitrates; Scanning electron microscopy; Synthesis (chemical); Transmission electron microscopy; X ray diffraction, Adsorption capacities; Environmental parameter; Expanded clay aggregates; Foreign ions; High specific surface area; Metronidazole; Nano; Nano-composite particle, Adsorption, adsorbent; magnesium oxide; metronidazole; nanocomposite; nanoparticle; aluminum silicate; antiinfective agent; clay; magnesium oxide; metronidazole; water pollutant, adsorption; aggregate; antibiotics; concentration (composition); environmental factor; equation; FTIR spectroscopy; iron nanoparticle; isotherm; magnesium; pollutant removal; reaction kinetics; scanning electron microscopy; transmission electron microscopy; X-ray diffraction, adsorption; Article; chemical composition; complex formation; environmental parameters; infrared spectroscopy; isotherm; kinetics; light weight expanded clay aggregate; pH; proton transport; scanning electron microscopy; species distribution; static electricity; surface area; surface property; transmission electron microscopy; water content; X ray diffraction; adsorption; chemistry; ecosystem restoration; isolation and purification; kinetics; procedures; water pollutant, Adsorption; Aluminum Silicates; Anti-Bacterial Agents; Anti-Infective Agents; Environmental Restoration and Remediation; Kinetics; Magnesium Oxide; Metronidazole; Microscopy, Electron, Scanning; Microscopy, Electron, Transmission; Nanocomposites; Water Pollutants, Chemical; X-Ray Diffraction |
Page Range: | pp. 8-20 |
Journal or Publication Title: | Chemosphere |
Volume: | 175 |
Publisher: | Elsevier Ltd |
Identification Number: | 10.1016/j.chemosphere.2017.02.043 |
ISSN: | 00456535 |
Depositing User: | مهندس مهدی شریفی |
URI: | http://eprints.muk.ac.ir/id/eprint/365 |
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