TY - JOUR
T1 - Catalytic role of Au@TiO2 nanocomposite on enhanced degradation of an azo-dye by electrochemically active biofilms
T2 - A quantized charging effect
AU - Kalathil, Shafeer
AU - Lee, Jintae
AU - Cho, Moo Hwan
PY - 2013/1/7
Y1 - 2013/1/7
N2 - A green and sustainable approach to azo dye degradation by an electrochemically active biofilm (EAB) with Au@TiO2 nanocomposite assistance (average size of Au ~8 nm) has been developed with high efficiency and mineralization of toxic intermediates. The EAB-Au@TiO2 system degraded the dye more rapidly than the EAB without the nanocomposite, which indicated the catalytic role of the Au@TiO2 nanocomposite on the dye degradation. Toxicity measurements showed that the dye wastewater treated by the EAB-Au@TiO2 system was almost non-toxic while the dye wastewater treated by the EAB without the nanocomposite showed a high toxicity compared to the parent dye. Quantized charging and Fermi level equilibration within the Au@TiO2 nanocomposite may be attributed to the excellent catalytic activity of the nanocomposite on the dye degradation. A mechanism of the catalytic activity is also proposed. Redox behavior and quantized charging of the nanocomposite were confirmed by cyclic voltammetry (CV) and differential pulse voltammetry (DPV), respectively. The proposed protocol can be effectively utilized in wastewater treatment applications.
AB - A green and sustainable approach to azo dye degradation by an electrochemically active biofilm (EAB) with Au@TiO2 nanocomposite assistance (average size of Au ~8 nm) has been developed with high efficiency and mineralization of toxic intermediates. The EAB-Au@TiO2 system degraded the dye more rapidly than the EAB without the nanocomposite, which indicated the catalytic role of the Au@TiO2 nanocomposite on the dye degradation. Toxicity measurements showed that the dye wastewater treated by the EAB-Au@TiO2 system was almost non-toxic while the dye wastewater treated by the EAB without the nanocomposite showed a high toxicity compared to the parent dye. Quantized charging and Fermi level equilibration within the Au@TiO2 nanocomposite may be attributed to the excellent catalytic activity of the nanocomposite on the dye degradation. A mechanism of the catalytic activity is also proposed. Redox behavior and quantized charging of the nanocomposite were confirmed by cyclic voltammetry (CV) and differential pulse voltammetry (DPV), respectively. The proposed protocol can be effectively utilized in wastewater treatment applications.
KW - Au@TiO nanocomposite
KW - Dye degradation
KW - Electrochemically active biofilm
KW - Fermi level equilibration
KW - Quantized charging
U2 - 10.1007/s11051-012-1392-5
DO - 10.1007/s11051-012-1392-5
M3 - Article
AN - SCOPUS:84871715857
VL - 15
JO - Journal of Nanoparticle Research
JF - Journal of Nanoparticle Research
SN - 1388-0764
IS - 1
M1 - 1392
ER -