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- Title
Equilibrium, kinetic, and thermodynamic studies on nickel removal from aqueous solutions using Ca-bentonite.
- Authors
Shirvani, Mehran; Rafiei, Hamid Reza; Bakhtiary, Somayeh; Azimzadeh, Behrooz; Amani, Saeed
- Abstract
Sorption using natural materials such as clay minerals is generally regarded as a suitable method for wastewater treatment. Equilibrium nickel (Ni) sorption on Ca-bentonite was determined in solutions with initial Ni concentrations ranging from 0–100 mg L−1. The effect of contact time and temperature on Ni sorption was also investigated. The equilibrium capacity of the bentonite for Ni removal was 2.93, 3.91, and 6.00 mg g−1at 278, 298, and 318 K, respectively, showing sorption enhancement with rising temperature. The results obtained from the kinetic tests indicated that major Ni removal occurred within the first 2 h, but the equilibrium condition was not attained before 24 h. Negative changes in Gibbs free energy (ΔG°) of sorption indicated that Ni sorption on Ca-bentonite was a spontaneous reaction. The positive values of both ΔH° and ΔS° suggest the endothermic nature of the Ni sorption and increased randomness at the solid–solution interface during the Ni chemisorption on the Ca-bentonite, respectively. In conclusion, Ca-bentonite is a potential sorbent for removal of Ni from wastewaters with the most favorable removal behavior at higher temperatures.
- Subjects
NICKEL; WASTEWATER treatment; BENTONITE; THERMODYNAMICS research; SORPTION
- Publication
Desalination & Water Treatment, 2015, Vol 54, Issue 2, p464
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2014.887037