| Removal of humic acid using TiO2 photocatalytic process--fractionation and molecular weight characterisation studies. | |
| | |
MedLine Citation:
|
PMID: 18336863 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The photocatalytic removal of humic acid (HA) using TiO2 under UVA irradiation was examined by monitoring changes in the UV(254) absorbance, dissolved organic carbon (DOC) concentration, apparent molecular weight distribution, and trihalomethane formation potentials (THMFPs) over treatment time. A resin fractionation technique in which the samples were fractionated into four components: very hydrophobic acids (VHA), slightly hydrophobic acids, hydrophilic charged (CHA) and hydrophilic neutral (NEU) was also employed to elucidate the changes in the chemical nature of the HA components during treatment. The UVA/TiO2 process was found to be effective in removing more than 80% DOC and 90% UV(254) absorbance. The THMFPs of samples were decreased to below 20 microg l(-1) after treatments, which demonstrate the potential to meet increasingly stringent regulatory level of trihalomethanes in water. Resin fractionation analysis showed that the VHA fraction was decreased considerably as a result of photocatalytic treatments, forming CHA intermediates which were further degraded with increased irradiation time. The NEU fraction, which comprised of non-UV-absorbing low molecular weight compounds, was found to be the most persistent component. |
| | |
Authors:
|
Sanly Liu; May Lim; Rolando Fabris; Christopher Chow; Ken Chiang; Mary Drikas; Rose Amal |
Related Documents
:
|
3502323 - Purification and characterization of the extracellular alpha-amylase activity of the ye... 7275013 - A convenient large-scale preparation of high molecular weight kininogen from human plasma. 3572843 - Evidence for phosphorylation of the extracellular acid phosphatase of leishmania donovani. |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-03-11 |
Journal Detail:
|
Title: Chemosphere Volume: 72 ISSN: 0045-6535 ISO Abbreviation: Chemosphere Publication Date: 2008 May |
Date Detail:
|
Created Date: 2008-05-12 Completed Date: 2008-09-22 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 0320657 Medline TA: Chemosphere Country: England |
Other Details:
|
Languages: eng Pagination: 263-71 Citation Subset: IM |
Affiliation:
|
ARC Centre of Excellence for Functional Nanomaterials, School of Chemical Sciences and Engineering, The University of New South Wales, Sydney NSW 2052, Australia. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Catalysis
/
radiation effects Chemical Fractionation / methods* Chromatography, Gel Humic Substances* Molecular Weight Spectrophotometry, Ultraviolet Titanium / chemistry* Ultraviolet Rays |
| Chemical | |
Reg. No./Substance:
|
0/Humic Substances; 13463-67-7/titanium dioxide; 7440-32-6/Titanium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Assessment of the effects of soil PAH accumulation by a battery of ecotoxicological tests.
Next Document: The use of physiological characteristics for comparison of organic compounds phytotoxicity.