Abstract：
:The photodegradation of methyl orange (MO) was investigated in aqueous suspension containing titania nanoparticles with mesostructures (m-TiO(2)) under UV irradiation. The experimental results show that 98% MO can be mineralized in the 1.0 g l(-1) m-TiO(2) suspension (pH 2.0) after 45 min illumination. Particular attention was devoted to the identification and the transformation of the fragments retaining the chromophoric group. The photodegradation mechanism of the quinonoid MO mainly involves three intermedial processes: demethylation, methylation and hydroxylation. Among those processes, demethylation is more favorable than the hydroxylation, but the hydroxylation results in the largest number of intermediates. The degradation pathway of quinonoid MO under the optimal conditions is also proposed.
journal_name
Chemospherejournal_title
Chemosphereauthors
Dai K,Chen H,Peng T,Ke D,Yi Hdoi
10.1016/j.chemosphere.2007.05.021subject
Has Abstractpub_date
2007-11-01 00:00:00pages
1361-7issue
9eissn
0045-6535issn
1879-1298pii
S0045-6535(07)00635-2journal_volume
69pub_type
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