NDLI: Biosorption of methylene blue by the buckwheat hull—kinetics and optimization of adsorption parameters using response surface methodology

Content Provider	IEEE Xplore Digital Library
Author	Dang Yan Li Ke-bin Luo Qian Wei Hong Guo Hong-sheng
Copyright Year	2011
Description	Author affiliation: Key Laboratory of Synthetic and Natural Functional, Molecule Chemistry of Ministry of Education, School of Chemistry and Material Science, Northwest University, Xi'an, 710079, China (Dang Yan; Li Ke-bin; Luo Qian) \|\| Key Laboratory of Northwest Water Resources; Environment and Ecology; Ministry of Education, Xi'an, 710048, China (Wei Hong) \|\| The Second Plant of Operation Management Company, Xi'an Water Supply Group, Xi'an 710048, China (Guo Hong-sheng)
Abstract	A low cost agricultural waste buckwheat hull after extracted natural pigment was used as bisorobent for removal of a cationic dye methylene blue from aqueous solution. The sorbent was characterized by FTIR, scanning electron microscopy (SEM), and potentiometric mass titration. The results showed that buckwheat hull is porous material with functional groups such as hydroxyl and carboxyl, and the pHzcp the initial dye concentration of 100 mg/L. At the optimized condition the maximum removal was found to be 99.54%, which is found to be at pH 4.12. The kinetics of adsorption of methylene blue onto buckwheat hull at five different initial concentrations was determined by batch experiments. The obtained data were analyzed by pseudo-first-order, pseudo-second-order, and intraparticle diffusion equations. Sorption processes were found to follow pseudo-second order kinetics. Intraparticle diffusion was found to take part in sorption processes but it could not be accepted as the primary rate determining step. Response surface methodology based on Box-Behnken design was used to further evaluate the effects of important parameters, namely, pH, initial dye concentration and temperature on the percentage removal of dye. A quadratic model for predicting the optimum point was established. The optimum conditions for removal of dye from water were found to be as follows: adsorbent concentration of 0.3 g per 50 mL of dye solution, pH 6.0, temperature of 40 °C, and was in good agreement with the experimental value. This study further implies that buckwheat hull is a promising sorbent for removal of dye from water.
Starting Page	4025
Ending Page	4029
File Size	580823
Page Count	5
File Format	PDF
ISBN	9781424480364
e-ISBN	9781424480395
DOI	10.1109/ICEICE.2011.5778303
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-04-15
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Scanning electron microscopy Buckwheat hull Materials Kinetic theory Response surface methodology Mathematical model Equations Methylene blue
Content Type	Text
Resource Type	Article

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