Abstract
The removal of malachite green from aqueous solution by Latvia-originated sphagnum peat moss was investigated applying dispersive solid-phase extraction. A sorbent powder, of particle size < 250 μm, was pretreated by successive refluxing of sphagnum in water, alcohol, and acetone. Foremost, the absorbance of the sphagnum matrix was assessed at the dye absorbance maxima of 254, 550, and 616 nm, applying different solution pH values. Furthermore, the optimum conditions of malachite green adsorption, such as equilibrium time, pH, adsorbent mass, and adsorbate initial concentration were investigated. In addition, the equilibrium isotherms and adsorption kinetics were studied. Fortunately, the absorbance ratio of malachite green to that of sphagnum matrix was the highest at pH 7.0 and 616 nm. Regarding dye extraction, a breakthrough in the adsorption speed was concluded, where a 2-min adsorption equilibrium contact time of 98.1% dye removal and a remarkable 30-s dye uptake of 97.3% were accomplished. Additionally, the equilibrium isotherm plot correlated well with Freundlich’s model (R2 = 0.9223). Also, the adsorption kinetic study demonstrated good correlation to the pseudo-second-order plot (R2 = 0.9999). Finally, excellent reproducibility of eight extraction replicates was demonstrated furnishing an average equilibrium dye removal of 97.8% and RSD of 1.06%.
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Acknowledgements
The authors would like to thank Dr. Khalid Obeid, Geology Department at Al-Azhar University-Gaza, for his assistance in sieving the sphagnum peat moss. Moreover, the authors are grateful to the staff of the wastewater treatment plant at the Northern Gaza Governorate for their collaboration and supply of the wastewater samples.
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Lubbad, S.H., Abu-Saqer, K.K. & Kodeh, F.S. Ultrafast and Highly Efficient Removal of Malachite Green from Aqueous Solution by Latvia-Originated Sphagnum Peat Moss Sorbent Applying Dispersive Solid-Phase Extraction. Int J Environ Res 12, 279–288 (2018). https://doi.org/10.1007/s41742-018-0090-2
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DOI: https://doi.org/10.1007/s41742-018-0090-2