title: Heterogeneous photocatalysed degradation of a herbicide derivative, isoproturon in aqueous suspension of titanium dioxide.
abstract: Heterogeneous photocatalysed degradation of a herbicide derivative, N-(4-isopropylphenyl)-N',N'-dimethylurea (Isoproturon, 1) was investigated in aqueous suspensions of titanium dioxide by monitoring the change in absorption intensity and depletion in Total Organic Carbon content as a function of irradiation time. The degradation kinetics was studied under different conditions such as pH, catalyst concentration, substrate concentration, different types of TiO(2) and in the presence of electron acceptors such as hydrogen peroxide (H(2)O(2)), potassium bromate (KBrO(3)) and potassium persulphate (K(2)S(2)O(8)) besides molecular oxygen. The degradation rates were found to be strongly influenced by all the above parameters. The photocatalyst Degussa P25 was found to be more efficient as compared with other photocatalysts. An attempt was made to identify the degradation product through GC-MS analysis technique.
authors.affiliation: Department of Chemistry, Aligarh Muslim University, 202002, Aligarh, India.
authors.forename: M M
authors.initials: MM
authors.lastname: Haque
authors.forename: M
authors.initials: M
authors.lastname: Muneer
mesh_terms: D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D006540:Herbicides / Q000378:metabolism*; D007700:Kinetics; D008782:Methylurea Compounds / Q000378:metabolism*; D016877:Oxidants / Q000737:chemistry; D010671:Phenylurea Compounds; D010777:Photochemistry; D014025:Titanium / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; D006540:Herbicides; D008782:Methylurea Compounds; D016877:Oxidants; D010671:Phenylurea Compounds; C009495:titanium dioxide; C028904:isoproturon; D014025:Titanium