Abstract：
:Radiation-induced degradation of Congo Red (an azo dye) in aqueous solution was studied both with steady-state radiolysis and time-resolve techniques of pulse radiolysis and laser flash photolysis. Decomposition and mineralization of Congo Red by gamma-rays was investigated with the changes of absorption spectra, degradation efficiency, TOC removal and pH changes of the solutions in different irradiation systems. The main radiolytic products resulting from steady-state radiolysis of Congo Red were examined by HPLC and LC-MS. Complete degradation of Congo Red was observed at different absorbed doses under diverse irradiation condition. The TOC removal of the solutions saturated with O2 or N2O reached 76% and 86% at the absorbed dose of 11.9 kGy, respectively. Pulse radiolysis and laser flash photolysis experiments were carried out to study the reaction of Congo Red with e(aq)- and ()OH. The reaction rate constants were determined.
journal_name
Chemospherejournal_title
Chemosphereauthors
Ma H,Wang M,Yang R,Wang W,Zhao J,Shen Z,Yao Sdoi
10.1016/j.chemosphere.2007.01.067subject
Has Abstractpub_date
2007-06-01 00:00:00pages
1098-104issue
6eissn
0045-6535issn
1879-1298pii
S0045-6535(07)00187-7journal_volume
68pub_type
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