Microwave degradation of methyl orange dye in aqueous solution in the presence of nano-TiO2-supported activated carbon (supported-TiO2/AC/MW).
In this study, nano-TiO(2)-supported activated carbon (TiO(2)/AC) was developed for the microwave (MW) degradation of an azo dye, methyl orange (MO), selected as a model contaminant in aqueous solution. The effects of selected process parameters such as supported TiO(2) content, MW irradiation time, initial MO concentration, catalyst dose, and solution pH on the degradation were assessed in detail. The results showed that the supported TiO(2) on AC could be excited resulting in the production of hydroxyl radical (OH) in aqueous solution under MW irradiation, which significantly enhanced the performance of AC/MW process for the degradation of MO. Also, the supported-TiO(2)/AC displayed higher catalytic activity than AC alone under MW irradiation. By comparison, the supported-TiO(2)/AC/MW process exhibited several advantages, including high degradation rate, short irradiation time, no residual intermediates and no secondary pollution. Hence, it shows to be a promising technology for the destruction of organic contaminants in dye treatment applications.
College of Environment, Liaoning University, Shenyang 110036, People's Republic of China. lnuhjhx@163.com
Zhaohong
Z
Zhang
Yao
Y
Xu
Xiping
X
Ma
Fangyi
F
Li
Danni
D
Liu
Zhonglin
Z
Chen
Fengqiu
F
Zhang
Dionysios D
DD
Dionysiou
D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D006863:Hydrogen-Ion Concentration; D053768:Metal Nanoparticles; D008855:Microscopy, Electron, Scanning; D008872:Microwaves; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D014025:Titanium / Q000737:chemistry*; D014867:Water; D014961:X-Ray Diffraction
D001391:Azo Compounds; D012996:Solutions; D014867:Water; C009495:titanium dioxide; C100258:methyl orange; D014025:Titanium