Document Detail


Photocatalytic mineralization of glyphosate in a small-scale plug flow simulation reactor by UV/TiO(2).
MedLine Citation:
PMID:  22494382     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The present work involves the photocatalytic mineralization of glyphosate on a plug flow reactor by UV/TiO(2). The effect of catalyst loading shows an optimal value (0.4 g L(-1)) which is necessary to mineralize glyphosate. The kinetic rate of glyphosate mineralization decreases with the increasing initial concentration of glyphosate, and the data can be described using the first-order model. An alkaline environment is conducive to glyphosate mineralization. The mineralization efficiency increases with elevated flow rate to 114 mL min(-1), which is followed by a decrease with a further increase in flow rate due to the reduction of the residence time. The presence of external oxidants (K(2)S(2)O(8), H(2)O(2) and KBrO(3)) and photosencitizer (humic acid) can significantly enhance glyphosate mineralization. Photocatalysis oxidation ability of the three studied oxidants decrease in the order of: S(2)O(8) (2-) > BrO(3) (-) > H(2)O(2). Finally, the Langmuir-Hinshelwood (L-H) model was used to rationalize the mechanisms of reactions occurring on TiO(2) surfaces and L-H model constants were also determined.
Authors:
Jian Q Chen; Zhi J Hu; Nan X Wang
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes     Volume:  47     ISSN:  1532-4109     ISO Abbreviation:  J Environ Sci Health B     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-04-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7607167     Medline TA:  J Environ Sci Health B     Country:  England    
Other Details:
Languages:  eng     Pagination:  579-88     Citation Subset:  IM    
Affiliation:
a Department of Environmental Science & Department of Analytical Chemistry , China Pharmaceutical University , Nanjing , China.
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