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Abstract
Product selectivity in the dehydrazonation of benzophenone hydrazone by photocatalytic oxidation with various semiconductor photocatalysts has been investigated using ultraviolet-A light. TiO2-P25 shows greater product selectivity of benzophenone formation with 93.9% conversion. Doping of metals on TiO2 selectively enhances the formation of azine from hydrazone. Solvents such as dichloromethane, chloroform, and dichloroethane also enhance the formation of azine.
ACKNOWLEDGMENTS
B. Krishnakumar and K. Selvam are thankful to the Council of Scientific and Industrial Research, New Delhi, for the award of senior research fellowships. The authors thank the Ministry of Environment and Forests (MOEF), New Delhi, for financial support through Research Grant Nos. 315-F-36 and F. 19/9/2007-RE.
Notes
Notes. [Benzophenone hydrazone] = 50 mg/25 mL; TiO2-P25 = 150 mg/25 mL; irradiation time = 60 min; airflow rate = 8.1 mL s−1; I UV = 1.381 × 10−6 einstein L−1 s−1.
Notes. [Benzophenone hydrazone] = 50 mg/25 mL; catalyst suspended = 150 mg/25 mL; irradiation time = 60 min; airflow rate = 8.1 mL s−1; I UV = 1.381 × 10−6 einstein L−1 s−1.