Abstract

Photocatalytic nitrate reduction was examined in a model water and in groundwater by using three commercially available titanium dioxide photocatalysts (Evonik P25, Evonik P90, and Sachtleben Hombikat UV100). The photocatalysts were characterized using uniform methods (TEM, XRD, surface area, UV-VIS, surface charge) and their photocatalytic activity was differentiated using these results. Under all experimental conditions, P25 and P90 were superior to UV100, and P90 outperformed P25 with nitrate reductions as high as 77% at the maximum irradiance level used (6.46×1022 photons/L). The photocatalytic nitrate reduction activity was found to be dependent on the rate of recombination, pH, and the total photocatalyst surface area, with the recombination rate being the limiting variable. Nitrate reduction was more efficient in model water than in groundwater that contained constituents capable of occupying photocatalyst surface sorption sites or scavenging conduction band electrons. The greater efficiencies of P25 and P90 compared with UV100 were attributed primarily to the mixed-phase nature of the photocatalysts, which allow for better charge separation, and the greater activity of P90 over P25 was attributed to a larger surface area. The results should be helpful in the selection of these commercially available photocatalysts to treat a wide range of pollutants other than nitrate.

Original languageEnglish (US)
Pages (from-to)852-861
Number of pages10
JournalJournal of Environmental Engineering (United States)
Volume138
Issue number8
DOIs
StatePublished - Aug 1 2012

Fingerprint

Photocatalysts
Nitrates
Titanium dioxide
nitrate
Water
surface area
recombination
water
Groundwater
groundwater
Scavenging
irradiance
Surface charge
transmission electron microscopy
Conduction bands
sorption
X-ray diffraction
titanium dioxide
Sorption
Photons

Keywords

  • Groundwater
  • Hombikat UV100
  • Nitrate
  • P25
  • P90
  • Photocatalysis
  • Photoreduction
  • Titanium dioxide

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry
  • Civil and Structural Engineering

Cite this

Nitrate reduction in water using commercial titanium dioxide photocatalysts (P25, P90, and Hombikat UV100). / Doudrick, Kyle; Monzón, Oihane; Mangonon, Alex; Hristovski, Kiril; Westerhoff, Paul.

In: Journal of Environmental Engineering (United States), Vol. 138, No. 8, 01.08.2012, p. 852-861.

Research output: Contribution to journalArticle

@article{3173c5edd8f64b828f147bb0fe1b9f27,
title = "Nitrate reduction in water using commercial titanium dioxide photocatalysts (P25, P90, and Hombikat UV100)",
abstract = "Photocatalytic nitrate reduction was examined in a model water and in groundwater by using three commercially available titanium dioxide photocatalysts (Evonik P25, Evonik P90, and Sachtleben Hombikat UV100). The photocatalysts were characterized using uniform methods (TEM, XRD, surface area, UV-VIS, surface charge) and their photocatalytic activity was differentiated using these results. Under all experimental conditions, P25 and P90 were superior to UV100, and P90 outperformed P25 with nitrate reductions as high as 77{\%} at the maximum irradiance level used (6.46×1022 photons/L). The photocatalytic nitrate reduction activity was found to be dependent on the rate of recombination, pH, and the total photocatalyst surface area, with the recombination rate being the limiting variable. Nitrate reduction was more efficient in model water than in groundwater that contained constituents capable of occupying photocatalyst surface sorption sites or scavenging conduction band electrons. The greater efficiencies of P25 and P90 compared with UV100 were attributed primarily to the mixed-phase nature of the photocatalysts, which allow for better charge separation, and the greater activity of P90 over P25 was attributed to a larger surface area. The results should be helpful in the selection of these commercially available photocatalysts to treat a wide range of pollutants other than nitrate.",
keywords = "Groundwater, Hombikat UV100, Nitrate, P25, P90, Photocatalysis, Photoreduction, Titanium dioxide",
author = "Kyle Doudrick and Oihane Monz{\'o}n and Alex Mangonon and Kiril Hristovski and Paul Westerhoff",
year = "2012",
month = "8",
day = "1",
doi = "10.1061/(ASCE)EE.1943-7870.0000529",
language = "English (US)",
volume = "138",
pages = "852--861",
journal = "Journal of Environmental Engineering, ASCE",
issn = "0733-9372",
publisher = "American Society of Civil Engineers (ASCE)",
number = "8",

}

TY - JOUR

T1 - Nitrate reduction in water using commercial titanium dioxide photocatalysts (P25, P90, and Hombikat UV100)

AU - Doudrick, Kyle

AU - Monzón, Oihane

AU - Mangonon, Alex

AU - Hristovski, Kiril

AU - Westerhoff, Paul

PY - 2012/8/1

Y1 - 2012/8/1

N2 - Photocatalytic nitrate reduction was examined in a model water and in groundwater by using three commercially available titanium dioxide photocatalysts (Evonik P25, Evonik P90, and Sachtleben Hombikat UV100). The photocatalysts were characterized using uniform methods (TEM, XRD, surface area, UV-VIS, surface charge) and their photocatalytic activity was differentiated using these results. Under all experimental conditions, P25 and P90 were superior to UV100, and P90 outperformed P25 with nitrate reductions as high as 77% at the maximum irradiance level used (6.46×1022 photons/L). The photocatalytic nitrate reduction activity was found to be dependent on the rate of recombination, pH, and the total photocatalyst surface area, with the recombination rate being the limiting variable. Nitrate reduction was more efficient in model water than in groundwater that contained constituents capable of occupying photocatalyst surface sorption sites or scavenging conduction band electrons. The greater efficiencies of P25 and P90 compared with UV100 were attributed primarily to the mixed-phase nature of the photocatalysts, which allow for better charge separation, and the greater activity of P90 over P25 was attributed to a larger surface area. The results should be helpful in the selection of these commercially available photocatalysts to treat a wide range of pollutants other than nitrate.

AB - Photocatalytic nitrate reduction was examined in a model water and in groundwater by using three commercially available titanium dioxide photocatalysts (Evonik P25, Evonik P90, and Sachtleben Hombikat UV100). The photocatalysts were characterized using uniform methods (TEM, XRD, surface area, UV-VIS, surface charge) and their photocatalytic activity was differentiated using these results. Under all experimental conditions, P25 and P90 were superior to UV100, and P90 outperformed P25 with nitrate reductions as high as 77% at the maximum irradiance level used (6.46×1022 photons/L). The photocatalytic nitrate reduction activity was found to be dependent on the rate of recombination, pH, and the total photocatalyst surface area, with the recombination rate being the limiting variable. Nitrate reduction was more efficient in model water than in groundwater that contained constituents capable of occupying photocatalyst surface sorption sites or scavenging conduction band electrons. The greater efficiencies of P25 and P90 compared with UV100 were attributed primarily to the mixed-phase nature of the photocatalysts, which allow for better charge separation, and the greater activity of P90 over P25 was attributed to a larger surface area. The results should be helpful in the selection of these commercially available photocatalysts to treat a wide range of pollutants other than nitrate.

KW - Groundwater

KW - Hombikat UV100

KW - Nitrate

KW - P25

KW - P90

KW - Photocatalysis

KW - Photoreduction

KW - Titanium dioxide

UR - http://www.scopus.com/inward/record.url?scp=84872705193&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84872705193&partnerID=8YFLogxK

U2 - 10.1061/(ASCE)EE.1943-7870.0000529

DO - 10.1061/(ASCE)EE.1943-7870.0000529

M3 - Article

VL - 138

SP - 852

EP - 861

JO - Journal of Environmental Engineering, ASCE

JF - Journal of Environmental Engineering, ASCE

SN - 0733-9372

IS - 8

ER -