Journal
DESALINATION AND WATER TREATMENT
Volume 185, Issue -, Pages 355-363Publisher
DESALINATION PUBL
DOI: 10.5004/dwt.2020.25424
Keywords
Zeolite; Fly ash; Methylene blue; Kinetics; Adsorption isotherm
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Funding
- Fundamental Research Funds for the Central Universities (China University of Mining and Technology) [2017XKZD10]
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NaX zeolites were prepared via an alkali fusion-hydrothermal method from coal gasification fly ash. The effects of the adsorbent dosages, initial dye concentrations, adsorption temperatures and pH values on the adsorption capacity of methylene blue (MB) onto the NaX zeolites were evaluated in batch mode. The maximum adsorption capacity of MB onto the NaX zeolites is 127.13 mg/g, which is higher than the recently reported values using similar adsorbents. The adsorption isotherm data fitted well to the Langmuir model, and the adsorption kinetics followed the pseudo-second-order model. Negative changes in Gibbs free energy (Delta G degrees) and enthalpy (Delta H degrees), and a positive change in entropy (Delta S degrees), suggested that the adsorption of MB onto the NaX zeolites is an exothermic and spontaneous process.
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