Mesoporous V-doped TiO₂ Nanoparticles as New Adsorbents for the Removal of Methylene Blue from Color Textile Wastewater

a.
a. College of Chemistry and Chemical Engineering, Fujian Normal University, Fuzhou 350007, China;
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b. Department of Chemistry, Ningde Normal University, Ningde, Fujian 352100, China;
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c. Fujian Provincial Key Laboratory of Photocatalysis-State Key Laboratory Breeding Base, Fuzhou 350002, China;
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d. Fujian Key Laboratory of Polymer Materials, Fuzhou 350007, China

Received Date: 7 July 2014
Available Online: 23 September 2014
Fund Project: This work was financially supported by the NNSFC (Nos. 21003021, 21173044, 21473096) (Nos. 21003021, 21173044, 21473096) National Basic Research Program of China (973 Program, No. 2012CB722607) (JA12017) the Science and Technology Project of Fujian Province (Nos. 2007J0359, 2006F5030, CE0015) (973 Program, No. 2012CB722607) and the Project of Fujian Province Communications Department (No. 201323) (Nos. 2007J0359, 2006F5030, CE0015)

V-doped TiO₂ nanoparticles (NPs) as dye adsorbents are synthesized by the co-precipitation method and characterized by X-ray powder diffraction, transmission electron microscope, N₂ adsorption at 77 K, and X-ray photoelectron spectroscopy. The adsorption of methylene blue (MB) on the V-doped TiO₂ NPs is studied in detail by varying the calcination temperature and V doping amount of the adsorbent, adsorbate concentration, adsorbent dosage, agitation rate, reaction temperature, and pH. The comparison of dye adsorption on V-doped TiO₂ and parent TiO₂ demonstrates that the adsorptive activity of TiO₂ can be improved by V doping. The enhanced adsorptive performance can be attributed to the tremendous changes in texture, structure, and surface morphology of adsorbent. The adsorption kinetic analysis shows that the adsorption follows the pseudo-second order kinetics. The apparent activation energy for adsorption is calculated by Arrhenius formula to be 37.6 kJ·mol^-1, indicating that the adsorption is controlled by both of the diffusion and interfacial adsorption steps. The adsorption data are analyzed using Langmuir and Freundlich isotherms and the results indicate that the Langmuir model provides better correlation of the experimental data. The results conclusively show that the adsorption of MB is a spontaneous behavior and endothermic reaction with the ΔH value of 17.60 kJ·mol^-1.

Mesoporous V-doped TiO₂ Nanoparticles as New Adsorbents for the Removal of Methylene Blue from Color Textile Wastewater

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通讯作者: 陈斌, bchen63@163.com

Mesoporous V-doped TiO2 Nanoparticles as New Adsorbents for the Removal of Methylene Blue from Color Textile Wastewater

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通讯作者: 陈斌, bchen63@163.com

Mesoporous V-doped TiO₂ Nanoparticles as New Adsorbents for the Removal of Methylene Blue from Color Textile Wastewater