Selective and effective adsorption of methyl blue by barium phosphate nano-flake.
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 1500 mg g(-1). The adsorption equilibrium results fitted well with the Freundlich isotherm model. The adsorption process took less than 30 min 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.
Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China.
Fan
F
Zhang
Zongshan
Z
Zhao
Ruiqin
R
Tan
Yanqun
Y
Guo
Lujie
L
Cao
Liang
L
Chen
Jia
J
Li
Wei
W
Xu
Ye
Y
Yang
Weijie
W
Song
D000327:Adsorption; D001464:Barium / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008751:Methylene Blue / Q000737:chemistry*; D036103:Nanotechnology; D010710:Phosphates / Q000138:chemical synthesis*; D013696:Temperature; D014961:X-Ray Diffraction
D010710:Phosphates; D001464:Barium; D008751:Methylene Blue