Removal of Methylene Blue from Aqueous Solution by Bone Char

Bone char was prepared from bovine bone for the removal of methylene blue from aqueous solution. The effects of particle size, contact time, and adsorption temperature on the removal rate of methylene blue were investigated. It was found that bone char particle size had an insignificant effect. The...

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Published inApplied sciences Vol. 8; no. 10; p. 1903
Main Authors Jia, Puqi, Tan, Hongwei, Liu, Kuiren, Gao, Wei
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.10.2018
Subjects
Activated carbon
Adsorbents
Adsorption
Aqueous solutions
bone char
Bone charcoal
Diffusion rate
Dyes
Free energy
Hydroxyapatite
Ion exchange
Isotherms
kinetics
Metallurgy
Methylene blue
Particle size
Photocatalysis
Porous materials
Temperature
United States > US
China
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Summary:Bone char was prepared from bovine bone for the removal of methylene blue from aqueous solution. The effects of particle size, contact time, and adsorption temperature on the removal rate of methylene blue were investigated. It was found that bone char particle size had an insignificant effect. The equilibration time was found at approximately 80 min. The removal rate decreased with an increase in temperature. The intraparticle diffusion was the main rate-limiting step. The experimental data was analyzed by kinetic, isotherm, and thermodynamic equations. The results show that the pseudo-second-order kinetic model and Freundlich, Temkin, and Dubinin–Kaganer–Radushkevich isotherm models are true of the adsorption process. The spontaneous and exothermic ion-exchange adsorption process was certified by the negative values of free energy change and enthalpy change, and 13.29 kJ mol−1 of adsorption energy.
ISSN:2076-3417
2076-3417
DOI:10.3390/app8101903