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Article

Methylene Blue Adsorption Study on Microcline Particles in the Function of Particle Size Range and Temperature

1
Szentágothai Research Centre, Environmental Analytical and Geoanalytical Research Group, University of Pécs, Ifjúság u. 20, H-7624 Pécs, Hungary
2
Department of Analytical and Environmental Chemistry, University of Pécs, Ifjúság útja 6., H-7624 Pécs, Hungary
3
Department of Geology and Meteorology, University of Pécs, Ifjúság u. 6, H-7624 Pécs, Hungary
*
Authors to whom correspondence should be addressed.
Minerals 2019, 9(9), 555; https://doi.org/10.3390/min9090555
Received: 19 August 2019 / Revised: 9 September 2019 / Accepted: 12 September 2019 / Published: 15 September 2019
(This article belongs to the Special Issue Mineral Sorbents)
In this paper, the adsorption process of methylene blue has been investigated on microcline particles as a function of particle size and temperature. The characterization of microcline in the particle size ranges of 1−71 μm and 71−315 μm gained by sieving was proved using X-ray diffraction (XRD) and scanning electron microscopy combined with energy-dispersive detector (SEM-EDS) in powder form, over laser diffraction measurements in aqueous suspension. The optimum dosage of adsorbent was 13.5 g/L in dye adsorption and the adsorption isotherms on both microcline size fractions were determined at this adsorbent concentration. The maximum adsorption capacities were in the range of 1.5–3.1 mg g−1 on microcline particles with supplementing evaluation of isotherms using the Langmuir model. Considering the problems of linearization of equations, the non-linear least-squares estimation can be strongly recommended for modeling adsorption-equilibrium. The adsorption isotherm determined at elevated temperature of 60−65 °C represents a breakpoint at around 20 mg L−1 of equilibrated dye concentration due to performing of a potential process of dye self-association. According to our experiments, the increase in temperature has an adverse effect on adsorption. View Full-Text
Keywords: microcline; methylene blue; particle size distribution; adsorption; temperature microcline; methylene blue; particle size distribution; adsorption; temperature
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MDPI and ACS Style

Pernyeszi, T.; Farkas, R.; Kovács, J. Methylene Blue Adsorption Study on Microcline Particles in the Function of Particle Size Range and Temperature. Minerals 2019, 9, 555. https://doi.org/10.3390/min9090555

AMA Style

Pernyeszi T, Farkas R, Kovács J. Methylene Blue Adsorption Study on Microcline Particles in the Function of Particle Size Range and Temperature. Minerals. 2019; 9(9):555. https://doi.org/10.3390/min9090555

Chicago/Turabian Style

Pernyeszi, Tímea, Roland Farkas, and János Kovács. 2019. "Methylene Blue Adsorption Study on Microcline Particles in the Function of Particle Size Range and Temperature" Minerals 9, no. 9: 555. https://doi.org/10.3390/min9090555

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