A novel method for photodegradation of high-chroma dye wastewater via electrochemical pre-oxidation.
A new two-step process involving the electrocatalytic (EC) pre-oxidation and the following photoelectrocatalytic synergistic (PEC) oxidation is proposed to treat the high concentration and high-chroma methyl orange dye wastewater, which cannot be degraded by photocatalytic oxidation (PC) directly. The SnO(2)/TiO(2)-NTs/Ti electrode simultaneously possessing the outstanding PC oxidation properties of TiO(2)-NTs and the excellent EC oxidation abilities of the Sb doped SnO(2) was synthesized by impregnating Sb doped SnO(2) nanoparticles into TiO(2)-NTs. In the pre-oxidation process as the first stage, the high-color dye wastewater is decolorized with electrochemical method to some extent. Then, the wastewater becomes a light transmission system. It provides a suitable condition for PC oxidation reaction in the second stage. The synergistic effects of PC and EC oxidation led to the high PEC efficiency and the complete mineralization of dye wastewater is achieved. This two-step process is fast and efficient, which is worthy to study and explore in the practical environmental treatment.
Zhao
Kunjiao
K
Department of Chemistry, Tongji University, 1239 Siping Road, 200092 Shanghai, China.
Zhao
Guohua
G
Li
Peiqiang
P
Gao
Junxia
J
Lv
Baoying
B
Li
Dongming
D
D001391:Azo Compounds / Q000737:chemistry*; D055664:Electrochemical Techniques; D004566:Electrodes; D052918:Environmental Restoration and Remediation; D007202:Indicators and Reagents / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry; D010084:Oxidation-Reduction; D010782:Photolysis; D017971:Tin Compounds / Q000737:chemistry; D014025:Titanium / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D001391:Azo Compounds; D007202:Indicators and Reagents; D017971:Tin Compounds; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C100258:methyl orange; D014025:Titanium; C045358:stannic oxide