The effect of particle shape on the activity of nanocrystalline TiO2 photocatalysts in phenol decomposition. Part 2

The key synthesis parameters influencing the particle shape and activity

Nándor Balázs, Dávid F. Srankó, A. Dombi, P. Sipos, K. Mogyorósi

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Nanosized TiO2 photocatalysts were synthesized via hydrogen-air flame hydrolysis by using two slightly different, home made diffusion flame burners (Burners A and B). Titanium(IV) chloride vapor was introduced into the flame via bubbling dry air throughout the precursor liquid. X-ray diffraction (XRD) measurements revealed that the particles are anatase-rutile mixtures with a phase composition ranging from 98:2 to 57:43 anatase to rutile weight ratio. The hydrogen-oxygen molar ratio in the flame, as well as the precursor vapor feeding rate were found to be the key parameters which determine both particle structure and morphology. Spherical and polyhedral particles with significantly varying photocatalytic activity were produced in Burner A by increasing the precursor vapor feeding rate at a constant hydrogen-oxygen molar ratio, the photocatalytic activity increased for samples synthesized. The differences in particle size, specific surface area and anatase-rutile composition were found to be marginal but the particle shape changed from spherical to polyhedral by increasing that parameter. From this, it was concluded that particle shape plays an important role in photocatalytic activity, the faceted particles are better photocatalysts than spherical ones. With Burner B, predominantly polyhedral particles were obtained, some of them with further improved photocatalytic activity. Synthesis parameters for obtaining maximum activity have been established for both burners. Our results prove, that bare (undoped) TiO2 photocatalysts with photocatalytic activity significantly better than that of P25 can routinely be prepared and their performance optimized via the fine-tuning of the synthesis parameters employed.

Original languageEnglish
Pages (from-to)569-576
Number of pages8
JournalApplied Catalysis B: Environmental
Volume96
Issue number3-4
DOIs
Publication statusPublished - Jun 7 2010

Fingerprint

Photocatalysts
Phenol
Fuel burners
Phenols
phenol
decomposition
Decomposition
Titanium dioxide
anatase
Vapors
rutile
Hydrogen
hydrogen
Oxygen
Air
Phase composition
Specific surface area
oxygen
Hydrolysis
Titanium

Keywords

  • Anatase
  • Flame hydrolysis
  • Nanoparticles
  • Phenol decomposition
  • Photocatalysis
  • Rutile
  • Shape dependence
  • Titania

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Environmental Science(all)

Cite this

@article{6b0d248c60434c468885b5dfcccb2b85,
title = "The effect of particle shape on the activity of nanocrystalline TiO2 photocatalysts in phenol decomposition. Part 2: The key synthesis parameters influencing the particle shape and activity",
abstract = "Nanosized TiO2 photocatalysts were synthesized via hydrogen-air flame hydrolysis by using two slightly different, home made diffusion flame burners (Burners A and B). Titanium(IV) chloride vapor was introduced into the flame via bubbling dry air throughout the precursor liquid. X-ray diffraction (XRD) measurements revealed that the particles are anatase-rutile mixtures with a phase composition ranging from 98:2 to 57:43 anatase to rutile weight ratio. The hydrogen-oxygen molar ratio in the flame, as well as the precursor vapor feeding rate were found to be the key parameters which determine both particle structure and morphology. Spherical and polyhedral particles with significantly varying photocatalytic activity were produced in Burner A by increasing the precursor vapor feeding rate at a constant hydrogen-oxygen molar ratio, the photocatalytic activity increased for samples synthesized. The differences in particle size, specific surface area and anatase-rutile composition were found to be marginal but the particle shape changed from spherical to polyhedral by increasing that parameter. From this, it was concluded that particle shape plays an important role in photocatalytic activity, the faceted particles are better photocatalysts than spherical ones. With Burner B, predominantly polyhedral particles were obtained, some of them with further improved photocatalytic activity. Synthesis parameters for obtaining maximum activity have been established for both burners. Our results prove, that bare (undoped) TiO2 photocatalysts with photocatalytic activity significantly better than that of P25 can routinely be prepared and their performance optimized via the fine-tuning of the synthesis parameters employed.",
keywords = "Anatase, Flame hydrolysis, Nanoparticles, Phenol decomposition, Photocatalysis, Rutile, Shape dependence, Titania",
author = "N{\'a}ndor Bal{\'a}zs and Srank{\'o}, {D{\'a}vid F.} and A. Dombi and P. Sipos and K. Mogyor{\'o}si",
year = "2010",
month = "6",
day = "7",
doi = "10.1016/j.apcatb.2010.03.006",
language = "English",
volume = "96",
pages = "569--576",
journal = "Applied Catalysis B: Environmental",
issn = "0926-3373",
publisher = "Elsevier",
number = "3-4",

}

TY - JOUR

T1 - The effect of particle shape on the activity of nanocrystalline TiO2 photocatalysts in phenol decomposition. Part 2

T2 - The key synthesis parameters influencing the particle shape and activity

AU - Balázs, Nándor

AU - Srankó, Dávid F.

AU - Dombi, A.

AU - Sipos, P.

AU - Mogyorósi, K.

PY - 2010/6/7

Y1 - 2010/6/7

N2 - Nanosized TiO2 photocatalysts were synthesized via hydrogen-air flame hydrolysis by using two slightly different, home made diffusion flame burners (Burners A and B). Titanium(IV) chloride vapor was introduced into the flame via bubbling dry air throughout the precursor liquid. X-ray diffraction (XRD) measurements revealed that the particles are anatase-rutile mixtures with a phase composition ranging from 98:2 to 57:43 anatase to rutile weight ratio. The hydrogen-oxygen molar ratio in the flame, as well as the precursor vapor feeding rate were found to be the key parameters which determine both particle structure and morphology. Spherical and polyhedral particles with significantly varying photocatalytic activity were produced in Burner A by increasing the precursor vapor feeding rate at a constant hydrogen-oxygen molar ratio, the photocatalytic activity increased for samples synthesized. The differences in particle size, specific surface area and anatase-rutile composition were found to be marginal but the particle shape changed from spherical to polyhedral by increasing that parameter. From this, it was concluded that particle shape plays an important role in photocatalytic activity, the faceted particles are better photocatalysts than spherical ones. With Burner B, predominantly polyhedral particles were obtained, some of them with further improved photocatalytic activity. Synthesis parameters for obtaining maximum activity have been established for both burners. Our results prove, that bare (undoped) TiO2 photocatalysts with photocatalytic activity significantly better than that of P25 can routinely be prepared and their performance optimized via the fine-tuning of the synthesis parameters employed.

AB - Nanosized TiO2 photocatalysts were synthesized via hydrogen-air flame hydrolysis by using two slightly different, home made diffusion flame burners (Burners A and B). Titanium(IV) chloride vapor was introduced into the flame via bubbling dry air throughout the precursor liquid. X-ray diffraction (XRD) measurements revealed that the particles are anatase-rutile mixtures with a phase composition ranging from 98:2 to 57:43 anatase to rutile weight ratio. The hydrogen-oxygen molar ratio in the flame, as well as the precursor vapor feeding rate were found to be the key parameters which determine both particle structure and morphology. Spherical and polyhedral particles with significantly varying photocatalytic activity were produced in Burner A by increasing the precursor vapor feeding rate at a constant hydrogen-oxygen molar ratio, the photocatalytic activity increased for samples synthesized. The differences in particle size, specific surface area and anatase-rutile composition were found to be marginal but the particle shape changed from spherical to polyhedral by increasing that parameter. From this, it was concluded that particle shape plays an important role in photocatalytic activity, the faceted particles are better photocatalysts than spherical ones. With Burner B, predominantly polyhedral particles were obtained, some of them with further improved photocatalytic activity. Synthesis parameters for obtaining maximum activity have been established for both burners. Our results prove, that bare (undoped) TiO2 photocatalysts with photocatalytic activity significantly better than that of P25 can routinely be prepared and their performance optimized via the fine-tuning of the synthesis parameters employed.

KW - Anatase

KW - Flame hydrolysis

KW - Nanoparticles

KW - Phenol decomposition

KW - Photocatalysis

KW - Rutile

KW - Shape dependence

KW - Titania

UR - http://www.scopus.com/inward/record.url?scp=77950866594&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77950866594&partnerID=8YFLogxK

U2 - 10.1016/j.apcatb.2010.03.006

DO - 10.1016/j.apcatb.2010.03.006

M3 - Article

VL - 96

SP - 569

EP - 576

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

SN - 0926-3373

IS - 3-4

ER -