Sonocatalytic degradation of some dyestuffs and comparison of catalytic activities of nano-sized TiO2, nano-sized ZnO and composite TiO2/ZnO powders under ultrasonic irradiation.
Here, a novel sonocatalyst, composite TiO2/ZnO powder, was prepared through the combination of nano-sized TiO2 and ZnO powders. Because of the appropriate adsorbability to organic pollutants and special crystal interphase between TiO2 and ZnO particles, the composite TiO2/ZnO powder exhibits a high sonocatalytic activity under ultrasonic irradiation during the degradation of acid red B. Especially, the sonocatalytic activity of composite TiO2/ZnO powder with 4:1 molar proportion treated at 500 degrees C for 50 min showed obvious improvement compared with pure nano-sized TiO2 and ZnO powders. When the experimental conditions such as 10mg/L acid red B concentration, 1.0 g/L catalyst addition amount, pH=7.0, 20 degrees C system temperature, 100 min ultrasonic time and 50 mL total volume were adopted, the satisfactory degradation ratio and rate were obtained. All experiments indicate that the sonocatalytic method using composite TiO2/ZnO powder may be a more advisable choice for the treatments of non- or low-transparent organic wastewaters in future.
Department of Chemistry, Liaoning University, Chongshan Middle Road, No. 66, Huanggu District, Shenyang 110036, PR China. wangjun890@126.com
Jun
J
Wang
Zhe
Z
Jiang
Liqun
L
Zhang
Pingli
P
Kang
Yingpeng
Y
Xie
Yanhui
Y
Lv
Rui
R
Xu
Xiangdong
X
Zhang
D001391:Azo Compounds; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry* / Q000528:radiation effects*; D053758:Nanoparticles / Q000737:chemistry* / Q000528:radiation effects; D009282:Naphthalenesulfonates; D011208:Powders; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects; D014465:Ultrasonics; D015034:Zinc Oxide / Q000737:chemistry* / Q000528:radiation effects
D001391:Azo Compounds; D004396:Coloring Agents; D009282:Naphthalenesulfonates; D011208:Powders; C521611:acid red B; C009495:titanium dioxide; D014025:Titanium; D015034:Zinc Oxide