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- Title
Decontamination of methylene blue and congo red by SCB/CuO nanocomposites: isotherms and kinetic studies.
- Authors
Mubarika, Shamroza; Ali, Snovia; Manzoor, Suryya; Imran, Marryam; Ehsan, Samreen
- Abstract
In this study sugarcane bagasse copper oxide (SCB/CuO) nanocomposite was synthesized and its affinity for the batch adsorption of methylene blue and congo red was investigated. The impact of various operating factors including biosorbent dosage, contact time and pH on the percentage removal of these dyes was examined. The optimal contact time for methylene blue and congo red adsorption was 75 and 60 min, respectively. The optimum biomass dosage (SCB/CuO nanocomposite) for the decolorization of methylene blue and congo red was 0.02 and 0.04 g, respectively. The calculated value of zeta potential is 7. Second-order model was found to be most appropriate model for the elucidation of adsorption kinetics. Experimental results were established by applying various linear and non-linear isotherm models such as Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Halsey and Harkins-Jura etc. The obtained values of E according to Dubinin-Radushkevich is 1.9 and 13.86 kJ/mol for methylene blue and congo red, which showed physical and chemical nature of adsorption, respectively. The negative values of ΔG° and ΔH° indicated the spontaneity and exothermic nature of the process correspondingly.
- Subjects
METHYLENE blue; CONGO red (Staining dye); COPPER oxide; ADSORPTION kinetics; ATMOSPHERIC temperature; ZETA potential
- Publication
Desalination & Water Treatment, 2023, Vol 307, p212
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2023.29907