1. Selective and effective adsorption of methyl blue by barium phosphate nano-flake
- Author
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Zhang, Fan, Zhao, Zongshan, Tan, Ruiqin, Guo, Yanqun, Cao, Lujie, Chen, Liang, Li, Jia, Xu, Wei, Yang, Ye, and Song, Weijie
- Subjects
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BENZENESULFONATES , *NANOSTRUCTURED materials synthesis , *BARIUM compounds , *PHOSPHATES , *ADSORPTION (Chemistry) , *AQUEOUS solutions , *CRYSTAL structure - Abstract
Abstract: We report the synthesis of barium phosphate (BP) nano-flake and its adsorption behavior to methyl blue (MB) in aqueous solution. The as-obtained BP nano-flake revealed pure rhombohedral crystal structure. The adsorption capacity of MB onto BP reached 1500mgg−1. The adsorption equilibrium results fitted well with the Freundlich isotherm model. The adsorption process took less than 30min to reach equilibrium. The adsorption kinetics was elucidated by the pseudo-second-order kinetic equation. It followed 2-stage and 3-stage intra-particle diffusion models for the low and high concentration of dye solutions, respectively. The adsorption of MB using the BP nano-flake was highly selective, compared with the adsorption of other dyes. The interactions between MB and BP were mainly the ionic interaction and hydrogen bonds, which were confirmed by the X-ray photoelectron spectroscopic results and the density functional theory calculations. The BP nano-flake revealed less than 5% decrease in adsorption amount when it was recycled and reused five times. The present work shows that the BP nano-flake is promising for practical applications in MB removal from aqueous solutions. [Copyright &y& Elsevier]
- Published
- 2012
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