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- Title
Study on the treatment of Cd(II) contaminated wastewater by multi-walled carbon nanotubes/chitosan hydrogel film.
- Authors
Jia Wei; Hao Sun; Hongjuan Sha; Jianxin Zhong
- Abstract
This research aimed to investigate the adsorption properties and mechanisms of a chitosan hydrogel film incorporated with a 1% mass fraction of multi-walled carbon nanotubes (MWCNTs) to remove Cd(II) from wastewater contaminated with this metal. The hydrogel film exhibited a maximum adsorption capacity of 100.40 mg/g for Cd(II), reaching equilibrium within 360 min and showing optimal adsorption at pH 6. The hydrogel film could be regenerated for up to six cycles with a mere 6% decrease in the removal rate. Mechanistic investigations revealed that Cd(II) ions occupied active sites within the hydrogel film due to its porous structure. Analytical techniques such as Fourier transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy confirmed the formation of CdCO3 during the adsorption process. The adsorption kinetics followed a pseudo-second-order model, and the adsorption isotherm adhered to the Langmuir model, suggesting that monolayer chemical adsorption was the primary mechanism of Cd(II) uptake by the hydrogel film. Temperature and thermodynamic analyses indicated that the adsorption process was spontaneous, endothermic, and led to an increase in entropy. Overall, the incorporation of MWCNTs into the chitosan hydrogel film proved to be an efficient, recyclable, and environmentally friendly approach for the adsorption of cadmium from wastewater contaminated with this metal.
- Subjects
MULTIWALLED carbon nanotubes; FOURIER transform infrared spectroscopy techniques; CARBON films; HYDROGELS; X-ray photoelectron spectroscopy; CHITOSAN; ADSORPTION kinetics
- Publication
Desalination & Water Treatment, 2023, Vol 306, p89
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2023.29822