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- Title
Nickel removal by Nymphaea alba leaves and effect of leaves treatment on the sorption capacity: A kinetic and thermodynamic study.
- Authors
Zahedi, Reza; Dabbagh, Reza; Ghafourian, Hossein; Behbahanini, Azita
- Abstract
In this study, ability of Nymphaea alba (White Water lily) leaves to remove Ni from aqueous solution was studied in the batch system. HCl, MgCl, and CaCl chemical modification of N. alba leaves showed increasing sorption capacity of Ni (24 mg/g; pH 6.5). Removal percentage of Ni increased by adding more biomass. Increasing Ni concentration up to 210 mg/L and temperature up to 35°C caused higher biosorption capacity. However, higher Ni concentrations and rising temperature had vice versa effect. The optimum agitation time was 90 min. The prolongation of the agitation period had no considerable effect on the biosorption capacity. The kinetics study of modified N. alba leaves revealed that Ni sorption follows pseudo-second order kinetic model. Estimated parameters, the rate constant of second order biosorption ( K) and biosorption capacity ( q), for this model at T = 293 K were 0.225 g/mg min and 17.42 mg/g, respectively. The experimental results were correlated reasonably well with Langmuir model ( q = 118 mg/g; b = 0.022 L/mg). The changes in Gibb's free energy (Δ G°), enthalpy (Δ H°) and entropy (Δ S°) of Ni sorption by modified N. alba leaves were estimated as-1.726, 0.208, and 0.0018 KJ/mol K, respectively. Thermodynamic parameters revealed spontaneous, endothermic, and irreversible nature for Ni sorption. XRF and FT-IR analysis results showed that N. alba leaves had different functional carboxyl and sulfhydryl groups responsible for the sorption process.
- Subjects
NYMPHAEA; WATER lilies; ANALYTICAL chemistry; AQUEOUS solutions; SORPTION; NICKEL; THERMAL properties
- Publication
Water Resources, 2015, Vol 42, Issue 5, p690
- ISSN
0097-8078
- Publication type
Article
- DOI
10.1134/S0097807815050152