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Adsorption studies on copper, cadmium, and zinc ion removal from aqueous solution using magnetite/carbon nanocomposites
Abstract
Magnetite/carbon nanocomposites were tested as adsorbents for removal of metal ions from aqueous solutions. The effect of adsorption parameters such as solutions pH (ranging between 2 and 9), the nature and the quantity of the sorbent (10, 20, 40, and 60 mg), initial concentration of metal ions (10, 30, 50, 100, and 150 mg/L), and temperature (25, 45, and 65°C) was evaluated. The removal efficiency of metal ions depends on solution pH and increases with increasing carbon content, the dose of magnetite/carbon nanocomposites, and the temperature and decrease with initial concentration of the metal ions. The adsorption kinetics was described by pseudo-second-order model, and the equilibrium experimental data were well fitted to the Sips isotherm, yielding a maximum adsorption capacity of 41.11, 76.67, and 48.45 mg/g for copper, cadmium, and zinc, respectively. The thermodynamic parameter Gibbs free energy was determined to be negative, which indicated that the adsorption process is spontaneous. The optimum conditions (1 g/L adsorbent, 25°C, and pH 6) were selected for removal of metal ions from real wastewaters, with good results indicating that investigated nanocomposites could be used for the application in real systems.
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The ΔG values for CR were lower than -1 kJ mol-1 at various temperatures, showing that physical adsorption is an effective mechanism in this process.
“In addition, the ΔG values for CR were lower than -1 kJ mol-1 at various temperatures, which showed that physical adsorption is an effective mechanism in this process47,67.”
From The removal of anionic and cationic dyes from an aqueous solution using biomass-based activated carbon (2021) · cites this paper as [67]
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Metadata
- Authors
- Andelescu, A., Nistor, M. A., Muntean, S. G., & Rădulescu-Grad, M. E.
- Affiliations
- Romanian Academy (RO)
- Corresponding author
- Muntean, Simona Gabriela
- Venue
- Separation Science and Technology
- Publisher
- Informa UK Limited
- Published
- 2018-04-09
- Volume
- 53
- Issue
- 15
- Pages
- 2352-2364
- ISSN
- 0149-6395 (ISSN-L)
- 1520-5754
- OpenAlex
- W2796947256
- Cited by
- 50
- References
- 48
- Citations by year
- 2026: 1 · 2025: 7 · 2024: 10 · 2023: 9 · 2022: 8 · 2021: 9 · 2020: 5 · 2019: 1
- FWCI
- 1.64
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Separation Science and Technology (publishedVersion)
- Funders
- CNCS – UEFISCDI (PN-II-RU-TE-2014-4-1319)
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Environmental Science › Environmental Engineering › Environmental remediation with nanomaterials
- Physical Sciences › Environmental Science › Water Science and Technology › Coagulation and Flocculation Studies
- Keywords
- metal ion adsorption, copper removal, cadmium removal, zinc removal, heavy metal wastewater treatment, adsorption kinetics, pseudo-second-order kinetics, Sips isotherm, adsorption thermodynamics, pH effect on adsorption, adsorbent dosage
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