Nb2O5 as efficient and recyclable photocatalyst for indigo carmine degradation

被引:303
作者
Prado, Alexandre G. S. [1 ]
Bolzon, Lucas B. [1 ]
Pedroso, Carolina P. [1 ]
Moura, Aline O. [1 ]
Costa, Leonardo L. [1 ]
机构
[1] Univ Brasilia, Inst Quim, BR-70904970 Brasilia, DF, Brazil
关键词
Nb2O5; photodegradation; dye;
D O I
10.1016/j.apcatb.2008.01.024
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Heterogeneous photocatalysis is a significant green technology for application in water purification. The application of Nb2O5 catalyst for the photodegradation of contaminants is few reported in the literature. Thus, the Nb2O5 catalyst was characterized by SEM, FTIR, surface area and charge surface density. This catalyst was applied to degrade indigo carmine dye, which was compared with degradation catalyzed by TiO2 and ZnO. Almost 100% of dye degradation occurred at 20, 45 and 90 min for TiO2, ZnO and Nb2O5, respectively. The effect of Nb2O5 catalyst concentration. pH and ionic strength (mu) was investigated. The Nb2O5 activity increased at 0.7 g/L and for higher catalyst concentrations the degradation was kept constant. Degradation of indigo carmine dye catalyzed by Nb2O5 was improved at pH < 4.0 and mu = 0.05 mol/L. TiO2, ZnO and Nb2O5 were recovered and re-applied in other nine reaction cycles. While TiO2 and ZnO have an abrupt loss of their catalytic activity, Nb2O5 maintained 85% of catalytic activity after 10 reaction cycles. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:219 / 224
页数:6
相关论文
共 41 条
[1]   Photochemical reactions of a few selected pesticide derivatives and other priority organic pollutants in aqueous suspensions of titanium dioxide [J].
Abu Tariq, M. ;
Faisal, M. ;
Muneer, M. ;
Bahnemann, D. .
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 2007, 265 (1-2) :231-236
[2]  
Albertsson P. -<Angstrom>., 1985, PARTITION CELL PARTI
[3]  
BOLZON LB, 2006, REV BRAS ENS QUIM, V1, P25
[4]   Copper oxide and niobium pentoxide supported on silica-alumina: Synthesis, characterization, and application on diesel soot oxidation [J].
Braga, Valdeilson S. ;
Garcia, Fillipe A. C. ;
Dias, Jose A. ;
Dias, Silvia C. L. .
JOURNAL OF CATALYSIS, 2007, 247 (01) :68-77
[5]   Catalyst materials based on Nb2O5 supported on SiO2-Al2O3:: Preparation and structural characterization [J].
Braga, VS ;
Dias, JA ;
Dias, SCL ;
de Macedo, JL .
CHEMISTRY OF MATERIALS, 2005, 17 (03) :690-695
[6]   In situ vibrational spectroscopy studies of supported niobium oxide catalysts [J].
Burcham, LJ ;
Datka, J ;
Wachs, IE .
JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (29) :6015-6024
[7]   Photocatalytic degradation study of diclofenac over aqueous TiO2 suspensions [J].
Calza, P. ;
Sakkas, V. A. ;
Medana, C. ;
Baiocchi, C. ;
Dimou, A. ;
Pelizzetti, E. ;
Albanis, T. .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2006, 67 (3-4) :197-205
[8]   Nanoparticles superficial density of charge in electric double-layered magnetic fluid: A conductimetric and potentiometric approach [J].
Campos, AFC ;
Tourinho, FA ;
da Silva, GJ ;
Lara, MCFL ;
Depeyrot, J .
EUROPEAN PHYSICAL JOURNAL E, 2001, 6 (01) :29-35
[9]   Niobic acid and niobium phosphate as highly acidic viable catalysts in aqueous medium: Fructose dehydration reaction [J].
Carniti, Paolo ;
Gervasini, Antonella ;
Biella, Serena ;
Auroux, Aline .
CATALYSIS TODAY, 2006, 118 (3-4) :373-378
[10]   Photocatalytic kinetics of phenol and its derivatives over UV irradiated TiO2 [J].
Chen, DW ;
Ray, AK .
APPLIED CATALYSIS B-ENVIRONMENTAL, 1999, 23 (2-3) :143-157