PMID- 18803109
OWN - NLM
STAT- MEDLINE
DCOM- 20081218
LR  - 20131121
IS  - 1532-4109 (Electronic)
IS  - 0360-1234 (Linking)
VI  - 43
IP  - 7
DP  - 2008 Sep
TI  - Photocatalytic degradation of the herbicide pendimethalin using nanoparticles of 
      BaTiO3/TiO2 prepared by gel to crystalline conversion method: a kinetic approach.
PG  - 553-61
LID - 10.1080/03601230802234351 [doi]
AB  - 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 x 10(-7) mg(-2)h(-1)L2 and 5.403 x 
      10(-7) mg(-2)h(-1)L2, 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.
FAU - Gomathi Devi, Lakshmipathi Naik
AU  - Gomathi Devi LN
AD  - Department of Post Graduate Studies in Chemistry, Bangalore University, 
      Bangalore, India. gomatidevi naik@yahoo.co.in
FAU - Krishnamurthy, Gantigaiah
AU  - Krishnamurthy G
LA  - eng
PT  - Journal Article
PL  - England
TA  - J Environ Sci Health B
JT  - Journal of environmental science and health. Part. B, Pesticides, food 
      contaminants, and agricultural wastes
JID - 7607167
RN  - 0 (Aniline Compounds)
RN  - 0 (Barium Compounds)
RN  - 0 (Gels)
RN  - 0 (Herbicides)
RN  - 0 (Water Pollutants, Chemical)
RN  - 12047-27-7 (barium titanate(IV))
RN  - 15FIX9V2JP (titanium dioxide)
RN  - D1JT611TNE (Titanium)
RN  - VL6L14C06U (pendimethalin)
SB  - IM
MH  - Aniline Compounds/*chemistry/radiation effects
MH  - Barium Compounds/*chemistry
MH  - Catalysis
MH  - Crystallization
MH  - Gels/chemistry
MH  - Herbicides/*chemistry/radiation effects
MH  - Hydrogen-Ion Concentration
MH  - Kinetics
MH  - Metal Nanoparticles/*chemistry
MH  - Photochemistry
MH  - Titanium/*chemistry
MH  - *Ultraviolet Rays
MH  - Water Pollutants, Chemical/*chemistry/radiation effects
EDAT- 2008/09/23 09:00
MHDA- 2008/12/19 09:00
CRDT- 2008/09/23 09:00
PHST- 2008/09/23 09:00 [pubmed]
PHST- 2008/12/19 09:00 [medline]
PHST- 2008/09/23 09:00 [entrez]
AID - 902656750 [pii]
AID - 10.1080/03601230802234351 [doi]
PST - ppublish
SO  - J Environ Sci Health B. 2008 Sep;43(7):553-61. doi: 10.1080/03601230802234351.