Evaluation of a TiO2 photocatalysis treatment on nitrophenols and nitramines contaminated plant wastewaters by solid-phase extraction coupled with ESI HPLC-MS.
Nitration reactions of aromatic compounds are commonly involved in different industrial processes for pharmaceutical, pesticide or military uses. For many years, most of the manufacturing sites used lagooning systems to treat their process effluents. In view of a photocatalytic degradation assay, the wastewater of a lagoon was investigated by using HPLC coupled with mass spectrometry. The wastewater was highly concentrated in RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine), HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine) and two herbicides Dinoterb (2-tert-butyl-4,6-dinitrophenol) and Dinoseb (2-sec-butyl-4,6-dinitrophenol). First of all, an analytical method using solid-phase extraction (SPE) combined with HPLC ESI MS/MS was put in work for identification and titration of RDX, HMX and the two dinitrophenols in a complex natural matrix. Then, the UV/TiO2 treatment was investigated for pollutants removal. Dinitrophenolic compounds were significantly degraded after a 8-h-exposition of the wastewater/TiO2 suspension, whereas RDX and HMX were poorly affected.
Perchet
G
G
Université de Toulouse, Laboratoire d'Ecologie Fonctionnelle (ECOLAB), UPS, INP, ENSAT, Avenue de l'Agrobiopole, 31326 Castanet-Tolosan Cedex, France.
Merlina
G
G
Revel
J-C
JC
Hafidi
M
M
Richard
C
C
Pinelli
E
E
D019297:2,4-Dinitrophenol / Q000031:analogs & derivatives / Q000032:analysis / Q000528:radiation effects; D000814:Aniline Compounds / Q000032:analysis / Q000528:radiation effects*; D001392:Azocines / Q000032:analysis / Q000528:radiation effects; D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D004140:Dinitrophenols / Q000032:analysis / Q000528:radiation effects; D007220:Industrial Waste / Q000517:prevention & control*; D009578:Nitrobenzenes / Q000032:analysis / Q000528:radiation effects*; D009596:Nitrophenols / Q000032:analysis / Q000528:radiation effects*; D010782:Photolysis; D052616:Solid Phase Extraction; D021241:Spectrometry, Mass, Electrospray Ionization; D014025:Titanium / Q000737:chemistry*; D014227:Triazines / Q000032:analysis / Q000528:radiation effects; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000528:radiation effects*
D000814:Aniline Compounds; D001392:Azocines; D004140:Dinitrophenols; D007220:Industrial Waste; D009578:Nitrobenzenes; D009596:Nitrophenols; D014227:Triazines; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C010937:dinoterb; D014025:Titanium; C015384:nitramine; C007950:octogen; D019297:2,4-Dinitrophenol; C009160:cyclonite; C018527:dinoseb