The photocatalytic degradation of amino and nitro substituted stilbenesulfonic acids by TiO2/UV and Fe~(2+)/H2O2/UV under aqueous conditions

摘要

The photodegradation products of 4,4'-dinitrostilbene-2,2'-disulfonic acid(DNSDA),4-amino-4'-nitrostilbene-2,2'-disulfonic acid(ANSDA)and 4,4'-diaminostilbene-2,2'-disulfonic acid(DASDA)imparted by UV,TiO2/UV and Fe~(2+)7H2O2/UV were characterized by IC,HPLC and LC-ESI-MS/MS.Direct photolysis with UV light allowed the transformation of trans-isomers to the corresponding cis-isomers followed by degradation to aromatic aldehydes and carboxylic acids.Whilst both TiO2/UV and Fe~(2+)/H2O2/UV processes mineralized the model compounds,Fe~(2+)/H2O2/UV process was more rapid than TiO2/UV.