Utilisation of barium-modified analcime in sulphate removal : isotherms, kinetics and thermodynamics studies
Runtti, Hanna; Tynjälä, Pekka; Tuomikoski, Sari; Kangas, Teija; Hu, Tao; Rämö, Jaakko; Lassi, Ulla (2017-04-01)
Hanna Runtti, Pekka Tynjälä, Sari Tuomikoski, Teija Kangas, Tao Hu, Jaakko Rämö, Ulla Lassi, Utilisation of barium-modified analcime in sulphate removal: Isotherms, kinetics and thermodynamics studies, Journal of Water Process Engineering, Volume 16, April 2017, Pages 319-328, ISSN 2214-7144, https://doi.org/10.1016/j.jwpe.2016.11.004
© 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Analcime and commercial zeolite were employed as a precursor for preparing sorbent material for SO₄²⁻ removal over barium modification. Three sorbents were prepared: barium-modified analcime (ANA-Na-Ba), barium-modified acid-washed analcime (ANA-Ac-Na-Ba) and barium-modified zeolite (ZSM5-Na-Ba). Of the prepared materials, ANA-Ac-Na-Ba was the most efficient sorbent material for SO₄²⁻ removal, with a maximum sorption uptake of 13.7 mg g⁻¹ at room temperature. Batch sorption experiments were performed to evaluate the effect of initial pH, initial SO₄²⁻ concentration, sorbent dosage, temperature and contact time of sorption. Several isotherms were applied to describe the experimental results and Bi-Langmuir was found to provide the best correlation for adsorption of SO₄²⁻ on ANA-Ac-Na-Ba. Kinetic studies were applied for the most effective sorbent material, ANA-Ac-Na-Ba, and the results showed that the sorption process follows pseudo-second-order kinetics.
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