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Thermodynamic studies of methylene blue adsorption onto Fe-doped sulfated titania

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Abstract

Adsorption equilibrium of methylene blue onto Fe-doped sulfated titania (FST) samples was studied at different temperatures (298, 303, and 308 K). Based on the wavelength scanning from 580 to 760 nm, the wavelength of maximum absorbance of methylene blue was determined to be 666 nm and the corresponding calibration curve can be described by the equation of A = 0.0068 + 0.1514C. The adsorption of methylene blue onto FST samples was conformed to the Langmuir isotherms. The absorption capacity of each FST sample for methylene blue increases with increasing temperature. The increase in the adsorption parameters (q m, b, and K 0) and the positive ΔH θ reveal the endothermic feature of this adsorption process. The negative ΔG θ shows the adsorption of methylene blue onto FST samples can be carried out spontaneously at the examined temperatures. Furthermore, with the calcination temperature increases, the variation in crystallization degree, the surface and the sulfur species will obviously influence the adsorption properties of FST samples and the thermodynamic parameters of this adsorption process.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (50804025), the Applied and Basic Research Program of Sichuan Province, China (2008JY0140), the Youths Foundation of Sichuan Province, China (09ZQ026-067), the Talents Innovation Project of Panzhihua City, China (2009TX-5(1)) and the Promoting Industrialization Program of Panzhihua City, China (2011CY-G-23).

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  1. College of Biological and Chemical Engineering, Panzhihua University, Panzhihua, 617000, China

    Ying Yang & Congxue Tian

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  1. Ying Yang
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  2. Congxue Tian
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Correspondence to Ying Yang.

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Yang, Y., Tian, C. Thermodynamic studies of methylene blue adsorption onto Fe-doped sulfated titania. Res Chem Intermed 38, 583–594 (2012). https://doi.org/10.1007/s11164-011-0373-0

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  • DOI: https://doi.org/10.1007/s11164-011-0373-0

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