1. Commercial waste wood in the removal of methylene blue from aqueous media.
- Author
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Ahmadi, Aziz, Ignatova, Svetlana, Ketabchi, Mohammad Reza, Clough, Peter, and Soltani, Salman Masoudi
- Subjects
WOOD waste ,METHYLENE blue ,ADSORPTION capacity ,ADSORPTION kinetics ,FACTORIAL experiment designs ,MONOMOLECULAR films ,ADSORPTION (Chemistry) - Abstract
This study investigates the adsorption capacity and the kinetics of commercial waste wood in the UK, used as solid fuel, in the removal of methylene blue (MB) dye from aqueous media. The experiments were designed according to a fractional factorial design of experiment (DoE) framework, that is, Taguchi DoE, enabling us to reveal the possible inter-parameter interactions and also to pinpoint the optimum experimental envelopes via a statistically-systematic approach. The optimum removal efficiency (i.e. 96.7%) was achieved with a solution pH = 5, an adsorbent dosage = 4 g/L, an initial dye concentration = 0.015 g/L, and with a mixing speed of 30 rpm. The adsorption process was found to be exothermic. The adsorbent was saturated after approximately 60 min, corresponding to a maximum experimental adsorption capacity of 4.8 mg/g
adsorbent . The adsorption was best described by Freundlich isotherm. The maximum theoretical monolayer adsorption capacity was found to be 29.5 mg/gadsorbent . The adsorption kinetics followed a pseudo-second-order model. The dimensionless factor, RL , indicated that the adsorption process was favorable. The results indicate that the waste wood used in this study could be utilized as a low-cost and efficient adsorbent for MB removal. However, further studies investigating the leaching behavior of this waste wood are deemed to be of key importance before any large-scale application of this waste biomass stream. [ABSTRACT FROM AUTHOR] more...- Published
- 2020
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