title: Study of photocatalytic degradation of tributyltin, dibutylin and monobutyltin in water and marine sediments.
abstract: This study reports on the first assessment of the treatment of sediments contaminated by organotin compounds using heterogeneous photocatalysis. Photocatalysis of organotins in water was carried out under realistic concentration conditions (μgL(-1)). Degradation compounds were analyzed by GC-ICP-MS; a quasi-complete degradation of tributyltin (TBT) in water (99.8%) was achieved after 30min of photocatalytic treatment. The degradation by photolysis was about (10%) in the same conditions. For the first time decontamination of highly polluted marine sediments (certified reference material and harbor sediments) by photocatalysis proves that the use of UV and the production of hydroxyl radicals are an efficient way to treat organotins adsorbed onto marine sediment despite the complexity of the matrix. In sediment, TBT degradation yield ranged from 32% to 37% after only 2h of irradiation (TiO2-UV) and the by-products: dibutyltin (DBT) and monobutyltin (MBT) were degraded very rapidly in comparison with TBT. It was shown that during photocatalysis of organotins in sediments, the hydroxyl radical attack and photolysis are the two ways for the degradation of adsorbed TBT.
authors.affiliation: IEM (Institut Européen des Membranes), UMR 5635 (CNRS-ENSCM-UM2), Université Montpellier 2, Place E. Bataillon, F-34095 Montpellier, France. Electronic address: Stephan.brosillon@univ-montp2.fr.
authors.forename: Stephan
authors.initials: S
authors.lastname: Brosillon
authors.affiliation: HydroSciences Montpellier, UMR 5569 (CNRS, IRD, UM1, UM2), Université Montpellier 2, Place E. Bataillon, F-34095 Montpellier, France.
authors.forename: Chrystelle
authors.initials: C
authors.lastname: Bancon-Montigny
authors.affiliation: IEM (Institut Européen des Membranes), UMR 5635 (CNRS-ENSCM-UM2), Université Montpellier 2, Place E. Bataillon, F-34095 Montpellier, France.
authors.forename: Julie
authors.initials: J
authors.lastname: Mendret
mesh_terms: D000327:Adsorption; D002384:Catalysis; D052918:Environmental Restoration and Remediation; D008401:Gas Chromatography-Mass Spectrometry; D019015:Geologic Sediments / Q000737:chemistry*; D009947:Organotin Compounds / Q000737:chemistry*; D010782:Photolysis; D013997:Time Factors; D014025:Titanium / Q000737:chemistry; D014220:Trialkyltin Compounds / Q000737:chemistry*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D009947:Organotin Compounds; D014220:Trialkyltin Compounds; D014874:Water Pollutants, Chemical; C516409:mono-n-butyltin; C056189:di-n-butyltin; C009495:titanium dioxide; C011559:tributyltin; D014025:Titanium
keywords: Dredge sediment treatment; Marine sediment; Organotin; Photocatalysis; Tributyltin; Water