Abstract

Intimate coupling of photocatalysis and biodegradation (ICPB) shows promise to remove recalcitrant organic compounds from water, because photocatalysis breaks the compounds into biodegradable intermediates that are immediately mineralized by microorganisms inside a macroporous carrier, where they are protected from UV light and free radicals. Key to successful ICPB is a carrier capable of accumulating biofilm in its interior and strongly adhering photocatalyst on its exterior. We employed a low-temperature sintering method, the O method, to adhere TiO 2 to sponge-type macroporous carriers. The O method achieved a 7-fold increase of TiO 2 density, compared to the previously used sol-gel method, and it conserved the macropores for biofilm accumulation. Although the O-method carrier met the basic requirements of ICPB when degrading 2,4,5 trichlorophenol, it had low photocatalytic activity for breaking down more complex aromatics, like reactive dyes. Therefore, we improved the sintering method in two steps called the D and DN methods: reducing the TiO 2 concentration and then removing trimesic acid in the coating solution. The photocatalytic efficiency towards reactive black 5 increased 5 fold for the D method and 10 fold for DN method, and the DN carrier had superior TiO 2 adherence during long-term operation.

Original languageEnglish (US)
Pages (from-to)6489-6496
Number of pages8
JournalWater Research
Volume46
Issue number19
DOIs
StatePublished - Dec 1 2012

Fingerprint

Photocatalysis
Biofilms
Biodegradation
biofilm
biodegradation
Sintering
Photocatalysts
Free radicals
Organic compounds
Ultraviolet radiation
Microorganisms
Sol-gel process
fold
Dyes
Coatings
Acids
method
macropore
free radical
Water

Keywords

  • Intimate coupling of photocatalysis and biodegradation
  • Low-temperature sintering
  • Sponge-type carrier
  • Titanium dioxide

ASJC Scopus subject areas

  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Ecological Modeling

Cite this

Developing an efficient TiO 2-coated biofilm carrier for intimate coupling of photocatalysis and biodegradation. / Li, Guozheng; Park, Seongjun; Rittmann, Bruce.

In: Water Research, Vol. 46, No. 19, 01.12.2012, p. 6489-6496.

Research output: Contribution to journalArticle

@article{f0cc16cd8fae4feb87ae2bbd60d5b1a8,
title = "Developing an efficient TiO 2-coated biofilm carrier for intimate coupling of photocatalysis and biodegradation",
abstract = "Intimate coupling of photocatalysis and biodegradation (ICPB) shows promise to remove recalcitrant organic compounds from water, because photocatalysis breaks the compounds into biodegradable intermediates that are immediately mineralized by microorganisms inside a macroporous carrier, where they are protected from UV light and free radicals. Key to successful ICPB is a carrier capable of accumulating biofilm in its interior and strongly adhering photocatalyst on its exterior. We employed a low-temperature sintering method, the O method, to adhere TiO 2 to sponge-type macroporous carriers. The O method achieved a 7-fold increase of TiO 2 density, compared to the previously used sol-gel method, and it conserved the macropores for biofilm accumulation. Although the O-method carrier met the basic requirements of ICPB when degrading 2,4,5 trichlorophenol, it had low photocatalytic activity for breaking down more complex aromatics, like reactive dyes. Therefore, we improved the sintering method in two steps called the D and DN methods: reducing the TiO 2 concentration and then removing trimesic acid in the coating solution. The photocatalytic efficiency towards reactive black 5 increased 5 fold for the D method and 10 fold for DN method, and the DN carrier had superior TiO 2 adherence during long-term operation.",
keywords = "Intimate coupling of photocatalysis and biodegradation, Low-temperature sintering, Sponge-type carrier, Titanium dioxide",
author = "Guozheng Li and Seongjun Park and Bruce Rittmann",
year = "2012",
month = "12",
day = "1",
doi = "10.1016/j.watres.2012.09.029",
language = "English (US)",
volume = "46",
pages = "6489--6496",
journal = "Water Research",
issn = "0043-1354",
publisher = "Elsevier Limited",
number = "19",

}

TY - JOUR

T1 - Developing an efficient TiO 2-coated biofilm carrier for intimate coupling of photocatalysis and biodegradation

AU - Li, Guozheng

AU - Park, Seongjun

AU - Rittmann, Bruce

PY - 2012/12/1

Y1 - 2012/12/1

N2 - Intimate coupling of photocatalysis and biodegradation (ICPB) shows promise to remove recalcitrant organic compounds from water, because photocatalysis breaks the compounds into biodegradable intermediates that are immediately mineralized by microorganisms inside a macroporous carrier, where they are protected from UV light and free radicals. Key to successful ICPB is a carrier capable of accumulating biofilm in its interior and strongly adhering photocatalyst on its exterior. We employed a low-temperature sintering method, the O method, to adhere TiO 2 to sponge-type macroporous carriers. The O method achieved a 7-fold increase of TiO 2 density, compared to the previously used sol-gel method, and it conserved the macropores for biofilm accumulation. Although the O-method carrier met the basic requirements of ICPB when degrading 2,4,5 trichlorophenol, it had low photocatalytic activity for breaking down more complex aromatics, like reactive dyes. Therefore, we improved the sintering method in two steps called the D and DN methods: reducing the TiO 2 concentration and then removing trimesic acid in the coating solution. The photocatalytic efficiency towards reactive black 5 increased 5 fold for the D method and 10 fold for DN method, and the DN carrier had superior TiO 2 adherence during long-term operation.

AB - Intimate coupling of photocatalysis and biodegradation (ICPB) shows promise to remove recalcitrant organic compounds from water, because photocatalysis breaks the compounds into biodegradable intermediates that are immediately mineralized by microorganisms inside a macroporous carrier, where they are protected from UV light and free radicals. Key to successful ICPB is a carrier capable of accumulating biofilm in its interior and strongly adhering photocatalyst on its exterior. We employed a low-temperature sintering method, the O method, to adhere TiO 2 to sponge-type macroporous carriers. The O method achieved a 7-fold increase of TiO 2 density, compared to the previously used sol-gel method, and it conserved the macropores for biofilm accumulation. Although the O-method carrier met the basic requirements of ICPB when degrading 2,4,5 trichlorophenol, it had low photocatalytic activity for breaking down more complex aromatics, like reactive dyes. Therefore, we improved the sintering method in two steps called the D and DN methods: reducing the TiO 2 concentration and then removing trimesic acid in the coating solution. The photocatalytic efficiency towards reactive black 5 increased 5 fold for the D method and 10 fold for DN method, and the DN carrier had superior TiO 2 adherence during long-term operation.

KW - Intimate coupling of photocatalysis and biodegradation

KW - Low-temperature sintering

KW - Sponge-type carrier

KW - Titanium dioxide

UR - http://www.scopus.com/inward/record.url?scp=84868304178&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84868304178&partnerID=8YFLogxK

U2 - 10.1016/j.watres.2012.09.029

DO - 10.1016/j.watres.2012.09.029

M3 - Article

VL - 46

SP - 6489

EP - 6496

JO - Water Research

JF - Water Research

SN - 0043-1354

IS - 19

ER -