Preparation and characterization of a novel magnetic biosorbent functionalized with biomass of Bacillus Subtilis: Kinetic and isotherm studies of biosorption processes in the removal of Methylene Blue
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Tarih
2017
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Sci Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
A novel magnetic biosorbent (M-BSub) was successfully prepared by the immobilization of Bacillus subtilis (B. subtilis) with nano-sized magnetic silica which was confirmed by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), vibrating sample magnetometry (VSM), scanning electron microscope (SEM). Optimum biosorption conditions were determined as a function of pH, contact time and initial concentration of Methylene Blue (MB). The maximum biosorption efficiency of MB was obtained at pH 6.8 and 30 degrees C. The uptake of dye was very fast initially, and achieved equilibrium after 3 h. The isotherm models like Langmuir, Freundlich, Dubinin-Radushkevich (D-R) were used to analyze the equilibrium data. The equilibrium data fit better to the Freundlich model compared to the Langmuir model in concentration range studied (50-300 mg/L). The maximum biosorption capacity of biosorbent reached up to 59 +/- 0.6 mg g(-1) at pH value of 6.8 and 30 degrees C. The kinetics data were analyzed using adsorption kinetic models like the pseudo-first order, pseudo-second order and intraparticle diffusion equation. Kinetic data showed good agreement with the pseudo-second order kinetic model. In addition, biosorbent can be easily regenerated and reused for five cycles with high biosorption capacity. This study indicated that M-BSub is a reusable biosorbent for rapid, convenient, and efficient removal of MB from contaminated aquatic systems.
Açıklama
Anahtar Kelimeler
Methylene Blue (Mb), Magnetic Biosorbent, Magnetic Separation, Biomass Of Bacillus Subtilis (B. Subtilis), Isotherms, Biosorption Kinetics
Kaynak
Journal of Environmental Chemical Engineering
WoS Q Değeri
N/A
Scopus Q Değeri
Q1
Cilt
5
Sayı
5
