Document Detail


TiO(2)-assisted photocatalytic degradation of humic acids: effect of copper ions.
MedLine Citation:
PMID:  20453331     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The present study investigated the removal efficiency of aqueous humic acid solutions by TiO(2) photocatalytic degradation in the presence of Cu(II) species. The pseudo-first-order kinetics revealed rate constants as 9.87 x 10(-3), 7.19 x 10(-3), 3.81 x 10(-3) min(-1) for Color(436), UV(254) and TOC, respectively. Comparatively, lower rate constants were attained with respect to photocatalytic degradation of humic acid. Considering the source-dependent diverse chemical and spectral characteristics of NOM, a particular interaction would be expected for humic acid with Cu(II) species (0.1 mg L(-1)). The presence of copper ions significantly altered the photocatalytic degradation kinetics of humic acids in relation to the concentration effects of humic acid as expressed by spectroscopic parameters and TOC. Batch equilibrium adsorption experiments revealed a distinct Langmuirian-type adsorptive behavior of humic acid onto TiO(2) both in terms of UV(254) and Color(436) and a C-type adsorption isotherm was attained for TOC. K(F) values displayed an inconsistent effect of Cu(II) species, while adsorption intensity factor 1/n<1 denoted a prevailing favorable type of adsorption for Color(436) and UV(254). Because of the role of intra- and intermolecular interactions between copper ions and humic molecular size fractions, spectroscopic techniques were also employed for the assessment of the adsorption as well as photocatalytic degradation efficiencies.
Authors:
C S Uyguner; M Bekbolet
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Water science and technology : a journal of the International Association on Water Pollution Research     Volume:  61     ISSN:  0273-1223     ISO Abbreviation:  Water Sci. Technol.     Publication Date:  2010  
Date Detail:
Created Date:  2010-05-10     Completed Date:  2010-08-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9879497     Medline TA:  Water Sci Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  2581-90     Citation Subset:  IM    
Affiliation:
Bogazici University, Institute of Environmental Sciences, Bebek Istanbul, Turkey. uygunerc@boun.edu.tr
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adsorption
Catalysis
Copper*
Humic Substances*
Kinetics
Photochemistry / methods*
Spectrophotometry
Spectrophotometry, Ultraviolet
Titanium*
Chemical
Reg. No./Substance:
0/Humic Substances; 13463-67-7/titanium dioxide; 7440-32-6/Titanium; 7440-50-8/Copper

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Enhanced membrane bioreactor process without chemical cleaning.
Next Document:  MTBE degradation by hydrodynamic induced cavitation.