Congo Red Photocatalytic Decolourization using Modified Titanium
A study concerning the photocatalytic decolourization
of Congo red (CR) dye, over artificial UV irradiation is presented.
Photocatalysts based on a commercial titanium dioxide (TiO2)
modified with transition metals (Ni, Cu and Zn) were used. The
dopage method used was wet impregnation. A TiO2 sample without
salt was subjected to the same hydrothermal treatment to be used as
reference. Congo red solutions to several pH conditions (natural and
basic) were used to evaluate photocatalytic performance of each
doped catalysts. Photodecolourization percentage was measured
spectrofotrometically after 3 h of treatment to 499 nm as response
variable. Kinetics investigations of photodegradation indicated that
reactions obey to Langmuir-Hinshelwood model and pseudo–first
order law. The rate constant studies of photocatalytic decolourization
reactions for Zn–TiO2 and Cu–TiO2 photocatalysts indicated that in
all cases the rate constant of the reaction was higher than that of TiO2
undoped. These results show that nature of the metal modifying the
TiO2 influence on the efficiency of the photocatalyst evaluated in
process. Ni does not present an additional effect compared with TiO2,
while Zn enhances the photoactivity due to its electronic properties.
[1] M.H. Habibi, S. Tangestananejad, B. Yadollahi, "Photocatalytic
mineralisation of mercaptans as environmental pollutants in aquatic
system using TiO2 suspension", Appl. Catal. B: Environ. vol. 33, no.1,
pp. 57-63, Sept. 2001.
[2] V. Mirkhani, S. Tangestaninejad, M. Moghadam, M.H. Habibi and A.
Rostami-Vartooni, "Photocatalytic Degradation of Azo Dyes Catalyzed
by Ag Doped TiO2 Photocatalyst", J. Iran. Chem. Soc., vol. 6, no. 3, pp.
578-587, Sept. 2009.
[3] Serpone, N., Pelizzetti, E. (Eds), Photocatalysis Fundaments and
Application, 2nd ed., New York: Wiley-Interscience, 1989, p. 236.
[4] X.Z. Li, F.B. Li, "The enhancement of photodegradation efficiency
using Pt-TiO2 catalyst", Chemosphere vol. 48, no. 10, pp. 1103-1111.
Sept. 2002.
[5] A.V. Rupa, D. Manikandan, D. Divakar, T. Sivakumar, "Effect of
deposition of Ag on TiO2 nanoparticles on the photodegradation of
Reactive Yellow-17", J. Hazard. Mater. vol. 147, no. 3, pp. 906-913.
Aug. 2007.
[6] N. Sobana, M. Muruganadham, M. Swaminathan, J. "Nano-Ag particles
doped TiO2 for efficient photodegradation of Direct azo dyes", J. Mol.
Catal. A: Chem. vol. 258, no. 2, pp. 124-132. Oct. 2006.
[7] K. Chiang, T.M. Lim, L. Tsen, C.C. Lee, "Photocatalytic degradation
and mineralization of bisphenol A by TiO2 and platinized TiO2", Appl.
Catal. A: Gen. vol. 26, no. 2, pp. 225-237. Apr. 2004.
[8] A. Scalafani, J. Herrmann, "Influence of metallic silver and of platinumsilver
bimetallic deposits on the photocatalytic activity of titania (anatase
and rutile) in organic and aqueous media", J. Photochem. Photobiol.
A:Chem., vol.113, no. 2, pp. 181-188. Feb. 1998.
[9] X. Fu, LA. Clark, Q.Yang. M.A. Anderson "Enhanced Photocatalytic
Performance of Titania-Based Binary Metal Oxides: TiO2/SiO2 and
TiO2/ZrO2", Environ. Sci. Technol. vol. 30, no. 2, pp. 647-653. Jan.
1996.
[10] López-Vásquez A., Ortiz E., Arias F., Colina-Márquez J., Machuca F.,
"Photocatalytic decolorization of Methylene Blue with two
photoreactors". J. Adv. Oxid. Tech., vol. 11, no. 1, pp. 33-48. 2008.
[11] H. Lachheb, E. Puzenat, A. Houas, M. Ksibi, E. Elaloui, C. Guillard, J.
Herrmann, "Photocatalytic degradation of various types of dyes
(Alizarin S, Crocein Orange G, Methyl Red, Congo Red, Methylene
Blue) in water by UV-irradiated titania", Appl. Catal. B: Environ., vol.
39, no. 1, pp.75-90. Nov. 2002.
[12] M.H. Habibi, S. Tangestaninejad, M. Khaledisardashti,
"Photodegradation Kinetics of o-Nitroaniline (ONA),m-Nitroaniline
(MNA), p-Nitroaniline (PNA), p-Bromoaniline (PBrA) and o-
Chloroaniline (OClA) in Aqueous Suspension of Zinc Oxide", Polish J.
Chem., vol. 78, no. 6, pp. 851- 860. Jun. 2004.
[13] A. Fujishima, T.N. Rao, D.A. Tryk, "Titanium dioxide photocatalysis"
J. Photochem. Photobiol. C: Photochem. Vol 1. No. 1, pp. 1-21. Jun.
2000.
[1] M.H. Habibi, S. Tangestananejad, B. Yadollahi, "Photocatalytic
mineralisation of mercaptans as environmental pollutants in aquatic
system using TiO2 suspension", Appl. Catal. B: Environ. vol. 33, no.1,
pp. 57-63, Sept. 2001.
[2] V. Mirkhani, S. Tangestaninejad, M. Moghadam, M.H. Habibi and A.
Rostami-Vartooni, "Photocatalytic Degradation of Azo Dyes Catalyzed
by Ag Doped TiO2 Photocatalyst", J. Iran. Chem. Soc., vol. 6, no. 3, pp.
578-587, Sept. 2009.
[3] Serpone, N., Pelizzetti, E. (Eds), Photocatalysis Fundaments and
Application, 2nd ed., New York: Wiley-Interscience, 1989, p. 236.
[4] X.Z. Li, F.B. Li, "The enhancement of photodegradation efficiency
using Pt-TiO2 catalyst", Chemosphere vol. 48, no. 10, pp. 1103-1111.
Sept. 2002.
[5] A.V. Rupa, D. Manikandan, D. Divakar, T. Sivakumar, "Effect of
deposition of Ag on TiO2 nanoparticles on the photodegradation of
Reactive Yellow-17", J. Hazard. Mater. vol. 147, no. 3, pp. 906-913.
Aug. 2007.
[6] N. Sobana, M. Muruganadham, M. Swaminathan, J. "Nano-Ag particles
doped TiO2 for efficient photodegradation of Direct azo dyes", J. Mol.
Catal. A: Chem. vol. 258, no. 2, pp. 124-132. Oct. 2006.
[7] K. Chiang, T.M. Lim, L. Tsen, C.C. Lee, "Photocatalytic degradation
and mineralization of bisphenol A by TiO2 and platinized TiO2", Appl.
Catal. A: Gen. vol. 26, no. 2, pp. 225-237. Apr. 2004.
[8] A. Scalafani, J. Herrmann, "Influence of metallic silver and of platinumsilver
bimetallic deposits on the photocatalytic activity of titania (anatase
and rutile) in organic and aqueous media", J. Photochem. Photobiol.
A:Chem., vol.113, no. 2, pp. 181-188. Feb. 1998.
[9] X. Fu, LA. Clark, Q.Yang. M.A. Anderson "Enhanced Photocatalytic
Performance of Titania-Based Binary Metal Oxides: TiO2/SiO2 and
TiO2/ZrO2", Environ. Sci. Technol. vol. 30, no. 2, pp. 647-653. Jan.
1996.
[10] López-Vásquez A., Ortiz E., Arias F., Colina-Márquez J., Machuca F.,
"Photocatalytic decolorization of Methylene Blue with two
photoreactors". J. Adv. Oxid. Tech., vol. 11, no. 1, pp. 33-48. 2008.
[11] H. Lachheb, E. Puzenat, A. Houas, M. Ksibi, E. Elaloui, C. Guillard, J.
Herrmann, "Photocatalytic degradation of various types of dyes
(Alizarin S, Crocein Orange G, Methyl Red, Congo Red, Methylene
Blue) in water by UV-irradiated titania", Appl. Catal. B: Environ., vol.
39, no. 1, pp.75-90. Nov. 2002.
[12] M.H. Habibi, S. Tangestaninejad, M. Khaledisardashti,
"Photodegradation Kinetics of o-Nitroaniline (ONA),m-Nitroaniline
(MNA), p-Nitroaniline (PNA), p-Bromoaniline (PBrA) and o-
Chloroaniline (OClA) in Aqueous Suspension of Zinc Oxide", Polish J.
Chem., vol. 78, no. 6, pp. 851- 860. Jun. 2004.
[13] A. Fujishima, T.N. Rao, D.A. Tryk, "Titanium dioxide photocatalysis"
J. Photochem. Photobiol. C: Photochem. Vol 1. No. 1, pp. 1-21. Jun.
2000.
@article{"International Journal of Chemical, Materials and Biomolecular Sciences:57248", author = "A. López–Vásquez and D. Santamaría and M. Tibatá and C. Gómez", title = "Congo Red Photocatalytic Decolourization using Modified Titanium", abstract = "A study concerning the photocatalytic decolourization
of Congo red (CR) dye, over artificial UV irradiation is presented.
Photocatalysts based on a commercial titanium dioxide (TiO2)
modified with transition metals (Ni, Cu and Zn) were used. The
dopage method used was wet impregnation. A TiO2 sample without
salt was subjected to the same hydrothermal treatment to be used as
reference. Congo red solutions to several pH conditions (natural and
basic) were used to evaluate photocatalytic performance of each
doped catalysts. Photodecolourization percentage was measured
spectrofotrometically after 3 h of treatment to 499 nm as response
variable. Kinetics investigations of photodegradation indicated that
reactions obey to Langmuir-Hinshelwood model and pseudo–first
order law. The rate constant studies of photocatalytic decolourization
reactions for Zn–TiO2 and Cu–TiO2 photocatalysts indicated that in
all cases the rate constant of the reaction was higher than that of TiO2
undoped. These results show that nature of the metal modifying the
TiO2 influence on the efficiency of the photocatalyst evaluated in
process. Ni does not present an additional effect compared with TiO2,
while Zn enhances the photoactivity due to its electronic properties.", keywords = "Congo red, Dopage, Photodecolourization, Titanium
dioxide.", volume = "4", number = "11", pages = "711-4", }