Photocatalytic treatment of humic substances in drinking water

BR Eggins, FL Palmer, JA Byrne

Research output: Contribution to journalArticle

114 Citations (Scopus)

Abstract

Currently drinking water from the Mourne Mountains in Northern Ireland is treated by the traditional process of coagulation and filtration. Semiconductor photocatalysis was investigated as an alternative. Aldrich humic acid solutions (100 mg dm(-3), filtered through 0.22 mu m Millipore filters) were photolysed in a 0.1% suspension of Degussa P25 titanium dioxide using a mercury lamp. Degradation of humic acid was followed over time by measuring colour in Hazen units, 254/400 nm absorbance, fluorescence (excitation 237 nm; emission 400 nm) and size exclusion high performance chromatography. The extent of complete oxidation was determined by measuring dissolved organic carbon, chemical oxygen demand and carbon dioxide released. It took approximately 12 min to reduce the humic acid concentration by half; however 50% complete mineralization took 60 min. Some of the intermediates of reaction were highly fluorescent. In the absence of oxygen, light or titanium dioxide no significant degradation occurred. (C) 1997 Elsevier Science Ltd.
LanguageEnglish
Pages1223-1226
JournalWater Research
Volume31
Issue number5
Publication statusPublished - May 1997

Fingerprint

humic substance
Potable water
humic acid
drinking water
Titanium dioxide
Mercury vapor lamps
Degradation
degradation
Photocatalysis
Chemical oxygen demand
Organic carbon
Chromatography
Coagulation
absorbance
coagulation
chemical oxygen demand
dissolved organic carbon
chromatography
Carbon dioxide
fluorescence

Keywords

  • semiconductor photocatalysis
  • humic substances
  • drinking water
  • titanium dioxide

Cite this

Eggins, BR., Palmer, FL., & Byrne, JA. (1997). Photocatalytic treatment of humic substances in drinking water. 31(5), 1223-1226.
Eggins, BR ; Palmer, FL ; Byrne, JA. / Photocatalytic treatment of humic substances in drinking water. 1997 ; Vol. 31, No. 5. pp. 1223-1226.
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Eggins, BR, Palmer, FL & Byrne, JA 1997, 'Photocatalytic treatment of humic substances in drinking water', vol. 31, no. 5, pp. 1223-1226.

Photocatalytic treatment of humic substances in drinking water. / Eggins, BR; Palmer, FL; Byrne, JA.

Vol. 31, No. 5, 05.1997, p. 1223-1226.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Photocatalytic treatment of humic substances in drinking water

AU - Eggins, BR

AU - Palmer, FL

AU - Byrne, JA

N1 - World Environmental Congress / 2nd International Conference on Advanced Oxidation Technologies (AOTs-2) for Water and Air Treatment, LONDON, CANADA, SEP 12-16, 1995

PY - 1997/5

Y1 - 1997/5

N2 - Currently drinking water from the Mourne Mountains in Northern Ireland is treated by the traditional process of coagulation and filtration. Semiconductor photocatalysis was investigated as an alternative. Aldrich humic acid solutions (100 mg dm(-3), filtered through 0.22 mu m Millipore filters) were photolysed in a 0.1% suspension of Degussa P25 titanium dioxide using a mercury lamp. Degradation of humic acid was followed over time by measuring colour in Hazen units, 254/400 nm absorbance, fluorescence (excitation 237 nm; emission 400 nm) and size exclusion high performance chromatography. The extent of complete oxidation was determined by measuring dissolved organic carbon, chemical oxygen demand and carbon dioxide released. It took approximately 12 min to reduce the humic acid concentration by half; however 50% complete mineralization took 60 min. Some of the intermediates of reaction were highly fluorescent. In the absence of oxygen, light or titanium dioxide no significant degradation occurred. (C) 1997 Elsevier Science Ltd.

AB - Currently drinking water from the Mourne Mountains in Northern Ireland is treated by the traditional process of coagulation and filtration. Semiconductor photocatalysis was investigated as an alternative. Aldrich humic acid solutions (100 mg dm(-3), filtered through 0.22 mu m Millipore filters) were photolysed in a 0.1% suspension of Degussa P25 titanium dioxide using a mercury lamp. Degradation of humic acid was followed over time by measuring colour in Hazen units, 254/400 nm absorbance, fluorescence (excitation 237 nm; emission 400 nm) and size exclusion high performance chromatography. The extent of complete oxidation was determined by measuring dissolved organic carbon, chemical oxygen demand and carbon dioxide released. It took approximately 12 min to reduce the humic acid concentration by half; however 50% complete mineralization took 60 min. Some of the intermediates of reaction were highly fluorescent. In the absence of oxygen, light or titanium dioxide no significant degradation occurred. (C) 1997 Elsevier Science Ltd.

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KW - humic substances

KW - drinking water

KW - titanium dioxide

M3 - Article

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Eggins BR, Palmer FL, Byrne JA. Photocatalytic treatment of humic substances in drinking water. 1997 May;31(5):1223-1226.