A comparative study for the removal of methylene blue dye by N and S modified TiO2 adsorbents

Shila Jafari; Feiping Zhao; Dongbo Zhao; Manu Lahtinen; Amit Bhatnagar; Mika Sillanpää

doi:10.1016/j.molliq.2015.03.026

A comparative study for the removal of methylene blue dye by N and S modified TiO₂ adsorbents

Shila Jafari, Feiping Zhao, Dongbo Zhao, Manu Lahtinen, Amit Bhatnagar, Mika Sillanpää

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

Abstract

Successful removal of methylene blue (MB) dye from aqueous solutions using nitrogen and sulfur modified TiO₂(P25) nanoparticles has been demonstrated in this study. The modified adsorbents were characterized using various analytical methods, such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The adsorption potential of S-TiO₂, N-TiO₂ and TiO₂(P25) type adsorbents was tested for the removal of MB dye. The kinetic studies indicated that the adsorption of MB dye followed the pseudo-first order model, while desorption processes followed the second order model. The adsorption capacity of the adsorbent proved to be increasing as a function of initial pH of the solution. The maximum adsorption capacities were found to be 350.66, 410.12 and 282.84 mg/g of S-TiO₂, N-TiO₂ and TiO₂(P25), respectively. It can be concluded that modification of TiO₂(P25) nanoparticles with N and S leads to a higher adsorptive removal of MB.

Original language	English
Article number	4721
Pages (from-to)	90-98
Number of pages	9
Journal	Journal of Molecular Liquids
Volume	207
DOIs	https://doi.org/10.1016/j.molliq.2015.03.026
Publication status	Published - Jul 2015
Externally published	Yes

Keywords

Adsorbent
Isotherms
Kinetics
Methylene blue
TiO
pH

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Spectroscopy
Physical and Theoretical Chemistry
Materials Chemistry

Access to Document

10.1016/j.molliq.2015.03.026

Cite this

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title = "A comparative study for the removal of methylene blue dye by N and S modified TiO2 adsorbents",

abstract = "Successful removal of methylene blue (MB) dye from aqueous solutions using nitrogen and sulfur modified TiO2(P25) nanoparticles has been demonstrated in this study. The modified adsorbents were characterized using various analytical methods, such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The adsorption potential of S-TiO2, N-TiO2 and TiO2(P25) type adsorbents was tested for the removal of MB dye. The kinetic studies indicated that the adsorption of MB dye followed the pseudo-first order model, while desorption processes followed the second order model. The adsorption capacity of the adsorbent proved to be increasing as a function of initial pH of the solution. The maximum adsorption capacities were found to be 350.66, 410.12 and 282.84 mg/g of S-TiO2, N-TiO2 and TiO2(P25), respectively. It can be concluded that modification of TiO2(P25) nanoparticles with N and S leads to a higher adsorptive removal of MB.",

keywords = "Adsorbent, Isotherms, Kinetics, Methylene blue, TiO, pH",

author = "Shila Jafari and Feiping Zhao and Dongbo Zhao and Manu Lahtinen and Amit Bhatnagar and Mika Sillanp{\"a}{\"a}",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

year = "2015",

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doi = "10.1016/j.molliq.2015.03.026",

language = "English",

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T1 - A comparative study for the removal of methylene blue dye by N and S modified TiO2 adsorbents

AU - Jafari, Shila

AU - Zhao, Feiping

AU - Zhao, Dongbo

AU - Lahtinen, Manu

AU - Bhatnagar, Amit

AU - Sillanpää, Mika

PY - 2015/7

Y1 - 2015/7

N2 - Successful removal of methylene blue (MB) dye from aqueous solutions using nitrogen and sulfur modified TiO2(P25) nanoparticles has been demonstrated in this study. The modified adsorbents were characterized using various analytical methods, such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The adsorption potential of S-TiO2, N-TiO2 and TiO2(P25) type adsorbents was tested for the removal of MB dye. The kinetic studies indicated that the adsorption of MB dye followed the pseudo-first order model, while desorption processes followed the second order model. The adsorption capacity of the adsorbent proved to be increasing as a function of initial pH of the solution. The maximum adsorption capacities were found to be 350.66, 410.12 and 282.84 mg/g of S-TiO2, N-TiO2 and TiO2(P25), respectively. It can be concluded that modification of TiO2(P25) nanoparticles with N and S leads to a higher adsorptive removal of MB.

AB - Successful removal of methylene blue (MB) dye from aqueous solutions using nitrogen and sulfur modified TiO2(P25) nanoparticles has been demonstrated in this study. The modified adsorbents were characterized using various analytical methods, such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The adsorption potential of S-TiO2, N-TiO2 and TiO2(P25) type adsorbents was tested for the removal of MB dye. The kinetic studies indicated that the adsorption of MB dye followed the pseudo-first order model, while desorption processes followed the second order model. The adsorption capacity of the adsorbent proved to be increasing as a function of initial pH of the solution. The maximum adsorption capacities were found to be 350.66, 410.12 and 282.84 mg/g of S-TiO2, N-TiO2 and TiO2(P25), respectively. It can be concluded that modification of TiO2(P25) nanoparticles with N and S leads to a higher adsorptive removal of MB.

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KW - Isotherms

KW - Kinetics

KW - Methylene blue

KW - TiO

KW - pH

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