Preparation and Investigation of Photocatalytic Properties of ZnO Nanocrystals: Effect of Operational Parameters and Kinetic Study
ZnO nanocrystals with mean diameter size 14 nm
have been prepared by precipitation method, and examined as
photocatalyst for the UV-induced degradation of insecticide diazinon
as deputy of organic pollutant in aqueous solution. The effects of
various parameters, such as illumination time, the amount of
photocatalyst, initial pH values and initial concentration of
insecticide on the photocatalytic degradation diazinon were
investigated to find desired conditions. In this case, the desired
parameters were also tested for the treatment of real water containing
the insecticide. Photodegradation efficiency of diazinon was
compared between commercial and prepared ZnO nanocrystals. The
results indicated that UV/ZnO process applying prepared
nanocrystalline ZnO offered electrical energy efficiency and
quantum yield better than commercial ZnO. The present study, on the
base of Langmuir-Hinshelwood mechanism, illustrated a pseudo
first-order kinetic model with rate constant of surface reaction equal
to 0.209 mg l-1 min-1 and adsorption equilibrium constant of 0.124 l
mg-1.
[1] H. Shemer, K. G. Linden, Degradation and by-product formation of
diazinon in water during UV and UV/H2O2 treatment, J. Hazard. Mater.
B, Vol. 136, 2006, pp. 553-559.
[2] S. sakthivel, B. Neppolian, M. V. Shankar, B. Arabindoo, M.
Palanichamy, V. Murugesan, Solar photocatalytic degradation of azo dye
comparison of photocatalytic efficiency of ZnO and TiO2, Sol. Energy
Mater. Sol. C, Vol. 77, 2003, pp. 65-82.
[3] C. A. K. Gouvea, F. Wypych, S.G. Moraes, N. Duran, N. Nagata, P.
Peralta, Semiconductor-assisted photocatalytic degradation of reactive
dyes in aqueous solution, Chemosphere, Vol. 40, 2000, pp. 433-440.
[4] C. Lizama, J. Freer, J. Baeza, H. D. Mansilla, Optimized
photodegradation of reactive Blue 19 on TiO2 and ZnO suspensions,
Catal. Today, Vol. 76, 2002, pp. 235-246.
[5] H. J. Kuhn, S. E. Braslavsky, R. Schmidt, Chemical actinometry, IUPAC
technical report, Pure Appl. Chem, Vol. 76, 2004, pp. 2105-2146.
[6] W. K. Choy, W. Chu, The use of oxyhalogen in photocatalytic reaction
to remove o-chloroaniline in TiO2 dispersion, Chemosphere, Vol. 66,
2007, pp. 2106-2113.
[7] N. Daneshvar, A. Aleboyeh, A. R. Khataee, The evaluation of electrical
energy per order (EEO) for photooxidative decolorization of four textile
dye solution by the kinetic model, Chemosphere, Vol. 59, 2005, pp.761-
767.
[8] N. Daneshvar, D. Salari, A. R. Khataee, Photocatalytic degradation of
azo dye acid red 14 in water on ZnO as an alternative catalyst to TiO2, J.
Photochem. Photobiol. A: Chem., Vol. 162, 2004, pp. 317-322.
[9] R. Comparelli, E. Fanizza, M. L. Curri, P. D. Cozzoli, G. Mascolo, A.
Agostiano, UV-induced photocatalytic degradation of azo dyes by
organic-capped ZnO nanocrys- tals immobilized onto substrates, Appl.
Catal. B: Environ, Vol. 60, 2005, pp. 1-11.
[10] O. Legrini, E. Oliveros, A. M. Braun, Photochemical process for water
treatment, Chem. Rev., Vol. 93, 1993, pp. 671-698.
[11] C. Lizama, J. Freer, J. Baeza, H. Mansilla, Optimal photodegradation of
reactive blue 9 on TiO2 and ZnO suspension, Catal. Today, Vol. 76,
2002, pp. 235-246.
[12] A.A. Khodja, T. Sehili, J. Pilichowski, P. Boule, Photocatalytic
degradation of 2 phenyl-phenol on TiO2 and ZnO in aqueous
suspension, J. Photochem. Photobiol. A: Chem., Vol. 141, 2001, pp.
231-239.
[1] H. Shemer, K. G. Linden, Degradation and by-product formation of
diazinon in water during UV and UV/H2O2 treatment, J. Hazard. Mater.
B, Vol. 136, 2006, pp. 553-559.
[2] S. sakthivel, B. Neppolian, M. V. Shankar, B. Arabindoo, M.
Palanichamy, V. Murugesan, Solar photocatalytic degradation of azo dye
comparison of photocatalytic efficiency of ZnO and TiO2, Sol. Energy
Mater. Sol. C, Vol. 77, 2003, pp. 65-82.
[3] C. A. K. Gouvea, F. Wypych, S.G. Moraes, N. Duran, N. Nagata, P.
Peralta, Semiconductor-assisted photocatalytic degradation of reactive
dyes in aqueous solution, Chemosphere, Vol. 40, 2000, pp. 433-440.
[4] C. Lizama, J. Freer, J. Baeza, H. D. Mansilla, Optimized
photodegradation of reactive Blue 19 on TiO2 and ZnO suspensions,
Catal. Today, Vol. 76, 2002, pp. 235-246.
[5] H. J. Kuhn, S. E. Braslavsky, R. Schmidt, Chemical actinometry, IUPAC
technical report, Pure Appl. Chem, Vol. 76, 2004, pp. 2105-2146.
[6] W. K. Choy, W. Chu, The use of oxyhalogen in photocatalytic reaction
to remove o-chloroaniline in TiO2 dispersion, Chemosphere, Vol. 66,
2007, pp. 2106-2113.
[7] N. Daneshvar, A. Aleboyeh, A. R. Khataee, The evaluation of electrical
energy per order (EEO) for photooxidative decolorization of four textile
dye solution by the kinetic model, Chemosphere, Vol. 59, 2005, pp.761-
767.
[8] N. Daneshvar, D. Salari, A. R. Khataee, Photocatalytic degradation of
azo dye acid red 14 in water on ZnO as an alternative catalyst to TiO2, J.
Photochem. Photobiol. A: Chem., Vol. 162, 2004, pp. 317-322.
[9] R. Comparelli, E. Fanizza, M. L. Curri, P. D. Cozzoli, G. Mascolo, A.
Agostiano, UV-induced photocatalytic degradation of azo dyes by
organic-capped ZnO nanocrys- tals immobilized onto substrates, Appl.
Catal. B: Environ, Vol. 60, 2005, pp. 1-11.
[10] O. Legrini, E. Oliveros, A. M. Braun, Photochemical process for water
treatment, Chem. Rev., Vol. 93, 1993, pp. 671-698.
[11] C. Lizama, J. Freer, J. Baeza, H. Mansilla, Optimal photodegradation of
reactive blue 9 on TiO2 and ZnO suspension, Catal. Today, Vol. 76,
2002, pp. 235-246.
[12] A.A. Khodja, T. Sehili, J. Pilichowski, P. Boule, Photocatalytic
degradation of 2 phenyl-phenol on TiO2 and ZnO in aqueous
suspension, J. Photochem. Photobiol. A: Chem., Vol. 141, 2001, pp.
231-239.
@article{"International Journal of Chemical, Materials and Biomolecular Sciences:58511", author = "N. Daneshvar and S. Aber and M. S. Seyed Dorraji and A. R. Khataee and M. H. Rasoulifard", title = "Preparation and Investigation of Photocatalytic Properties of ZnO Nanocrystals: Effect of Operational Parameters and Kinetic Study", abstract = "ZnO nanocrystals with mean diameter size 14 nm
have been prepared by precipitation method, and examined as
photocatalyst for the UV-induced degradation of insecticide diazinon
as deputy of organic pollutant in aqueous solution. The effects of
various parameters, such as illumination time, the amount of
photocatalyst, initial pH values and initial concentration of
insecticide on the photocatalytic degradation diazinon were
investigated to find desired conditions. In this case, the desired
parameters were also tested for the treatment of real water containing
the insecticide. Photodegradation efficiency of diazinon was
compared between commercial and prepared ZnO nanocrystals. The
results indicated that UV/ZnO process applying prepared
nanocrystalline ZnO offered electrical energy efficiency and
quantum yield better than commercial ZnO. The present study, on the
base of Langmuir-Hinshelwood mechanism, illustrated a pseudo
first-order kinetic model with rate constant of surface reaction equal
to 0.209 mg l-1 min-1 and adsorption equilibrium constant of 0.124 l
mg-1.", keywords = "Zinc oxide nanopowder, Electricity consumption, Quantum yield, Nanoparticles, Photodegradation, Kinetic model, Insecticide.", volume = "1", number = "5", pages = "62-6", }