Online citations, reference lists, and bibliographies.

Photocatalytic Degradation Of The Herbicide Pendimethalin Using Nanoparticles Of BaTiO3/TiO2 Prepared By Gel To Crystalline Conversion Method: A Kinetic Approach

L. Gomathi Devi, Gantigaiah Krishnamurthy
Published 2008 · Chemistry, Medicine

Cite This
Download PDF
Analyze on Scholarcy
Share
Photocatalytic degradation of the herbicide, pendimethalin (PM) was investigated with BaTiO3/TiO2 UV light system in the presence of peroxide and persulphate species in aqueous medium. The nanoparticles of BaTiO3 and TiO2 were obtained by gel to crystallite conversion method. These photo catalysts are characterized by energy dispersive x-ray analysis (EDX), scanning electron microscope (SEM), x-ray diffraction (XRD), and Brunauer-Emmett-Teller (BET) adsorption isotherm and reflectance spectral studies. The quantum yields for TiO2 and BaTiO3 for the degradation reactions are 3.166 Einstein m−2 s−1 and 2.729 Einstein m−2 s−1 and catalytic efficiencies are 6.0444 × 10−7 mg−2h−1L2 and 5.403 × 10−7 mg−2h−1L2, respectively as calculated from experimental results. BaTiO3 exhibited comparable photocatalytic efficiency in the degradation of pendimethalin as the most widely used TiO2 photocatalyst. The persulphate played an important role in enhancing the rate of degradation of pendimethalin when compared to hydrogen peroxide. The degradation process of pendimethalin followed the first-order kinetics and it is in agreement with Langmuir-Hinshelwood model of surface mechanism. The reason for high stability of pendimethalin for UV-degradation even in the presence of catalyst and oxidizing agents were explored. The higher rate of degradation was observed in alkaline medium at pH 11. The degradation process was monitored by spectroscopic techniques such as ultra violet-visible (UV-Vis), infrared (IR) and gas chromatography mass spectroscopy (GC-MS). The major intermediate products identified were: N-propyl-2-nitro-6-amino-3, 4-xylidine, (2, 3-dimethyl-5-nitro-6-hydroxy amine) phenol and N-Propyl-3, 4-dimethyl-2, 6-dinitroaniline by GC-MS analysis and the probable reaction mechanism has been proposed based on these products.
This paper references
10.1155/S1110662X03000126
Photocatalytic degradation of reactive yellow 17 dye in aqueous solution in the presence of TiO 2 with cement binder
B. Neppolian (2003)
10.1006/EESA.2000.1942
Effect of pendimethalin on growth and photosynthetic activity of Protosiphon botryoides in different nutrient states.
E. F. Shabana (2001)
10.1246/bcsj.58.2015
Heterogeneous photocatalytic decomposition of phenol over TiO2 powder
K. Okamoto (1985)
10.1021/es00172a009
Photocatalytic production of hydrogen peroxides and organic peroxides in aqueous suspensions of titanium dioxide, zinc oxide, and desert sand.
C. Kormann (1988)
Pendimethalin Analysis of Risks to Endangered and Threatened Salmon and Steelhead
K. Pluntke (2004)
Photocatalytic production of H2O2 and organic peroxides in aqueous suspensions of TiO2, ZnO, and desert sand
C. Kormann (1988)
10.1016/0021-9517(90)90269-P
Photocatalytic degradation of organic water contaminants: Mechanisms involving hydroxyl radical attack
C. Turchi (1990)
10.1016/0043-1354(90)90199-G
Purification of water with near—u.v. illuminated suspensions of titanium dioxide
R. Matthews (1990)
10.1002/9783527610884.CH5
Photochemical Processes of Water Treatment
T. Oppenländer (2007)
10.1016/0021-9517(88)90085-1
Kinetics of photocatalytic oxidation of organic solutes over titanium dioxide
R. Matthews (1988)
10.1039/JM9940401875
Wet chemical syntheses of ultrafine multicomponent ceramic powders through gel to crystallite conversion
P. Padmini (1994)
Weed Science: Principles and Practices
T. J. Monaco (1975)
10.1007/978-1-4612-2862-2_1
The SCS/ARS/CES pesticide properties database for environmental decision-making.
R. D. Wauchope (1992)
10.1163/156856797X00439
Photocatalytic reduction of azo dyes Naphthol Blue Black and Disperse Blue 79
C. Nasr (1997)
10.1021/es00041a018
Direct mass spectrometric studies of the destruction of hazardous wastes. 2. Gas-phase photocatalytic oxidation of trichloroethylene over titanium oxide: products and mechanisms
M. Nimlos (1993)
10.1007/BF00806117
Photocatalyzed mineralization of a trimethylated phenol in oxygenated aqueous titania. An alternative to microbial degradation
R. Terzian (1995)
10.1080/03601230600962302
Photocatalytic Degradation of the Herbicide Erioglaucine in the Presence of Nanosized Titanium Dioxide: Comparison and Modeling of Reaction Kinetics
N. Daneshvar (2006)
10.1002/aic.690370714
Photon absorption by aqueous TiO2 dispersion contained in a stirred photoreactor
V. Augugliaro (1991)
Solid State Chemistry and Its Applications
A. West (1984)
Photocatalytic degradation of p-amino azo benzene using various heat treated TiO2 as the photocatalyst
L. Gomathi Devi (1999)
10.1016/S1010-6030(98)00389-X
Photocatalytic degradation of p-amino-azo-benzene and p-hydroxy-azo-benzene using various heat treated TiO2 as the photocatalyst
L. G. Devi (1999)



This paper is referenced by
Semantic Scholar Logo Some data provided by SemanticScholar