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- Title
Cadmium(II) removal from aqueous solution using a novel magnetic nanoparticle impregnated onto Citrus hystrix leaves.
- Authors
Sribharathi, Swaminathan; Anitha, Panneerselvam; Sudha, Ramasamy; Poornima, Krishnan; Kavitha, Gurusamy
- Abstract
The Cd(II) adsorption capacity of magnetic nanoparticle loaded activated carbon synthesized from Citrus hystrix leaves (MCHLAC), which is a novel agricultural waste material, was evaluated regarding contact time, pH, adsorbent dose, and temperature during batch adsorption process with raw material (Citrus hystrix leaves (CHL)). The optimum contact time and pH for the adsorption of cadmium(II) ions onto CHL and MCHLAC were found to be 120 min and 4.0-7.0. The functionality, textural, surface morphology, and elemental analysis of the CHL and MCHLAC before and after the adsorption were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscope, and energy dispersive X-ray analysis. The experimental data were analyzed using the Freundlich, Langmuir, Temkin, and Dubinin-Radushkevich adsorption isotherm equations using nonlinear regression analysis. The equilibrium data agreed well with the Langmuir model, which confirmed the monolayer coverage of cadmium(II) ions. Based on Langmuir isotherm the adsorption capacity was found to be 257.45 mg g-1 for MCHLAC which was significantly 4.4 times greater than that of CHL (58.75 mg g-1) at 300 K. The thermodynamic parameters indicated that the adsorption process was spontaneous and exothermic in nature. The kinetic data followed by the pseudo-second-order model with a film diffusion process. The spent adsorbent was regenerated and recycled by batch mode process over five cycles of operation and MCHLAC showed a better result than CHL.
- Subjects
ACTIVATED carbon; ADSORPTION capacity; LANGMUIR isotherms; ENERGY dispersive X-ray spectroscopy; CADMIUM; FOURIER transform infrared spectroscopy; AQUEOUS solutions; CITRUS
- Publication
Desalination & Water Treatment, 2020, Vol 196, p388
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2020.26038