Decolorization of procion red MX-5B in electrocoagulation (EC), UV/TiO2 and ozone-related systems

作者：Wu Chung Hsin; Chang Chung Liang; Kuo Chao Yin^*

来源：Dyes and Pigments, 2008, 76(1): 187-194.

DOI：10.1016/j.dyepig.2006.08.017

• decolorization
• energy consumption
• procion red MX-5B
• electrocoagulation
• UV
• TiO2
• O-3

This investigation assessed the decolorization efficiency of Procion Red MX-5B in electrocoagulation (EC), UV/TiO2 and ozone-related systems. The effectiveness of energy input was also determined. The decolorization rate constants of these EC, UV/TiO2 and ozone-related systems fitted pseudo-first-order kinetics and the values were in the order O-3 (24 W) > O-3 (16 W) > O-3 (16 W)/EC (8 W) > UV/TiO2/O-3 (8 W)/EC (8w)>O-3 (10W)>UV/O-3 (8W)/EC (8W)>UV/O-3 (8W)>O-3 (8W)>UV/riO(2)/O-3 (8W)>O-3 (8W)/EC (8W)>O-3 (4W)/EC (4 W) > UV/TiO2/EC (8 W) > UV/TiO2 > UV/EC (8 W) > EC (8 W). The decolorization rate constants increased with the total power input. Additionally, the decolorization efficiency could be promoted by combining UV with O-3, UV with EC, EC with UVfriO(2) and EC with UV/O-3. This study reveals that combining EC with UV/TiO2 or UV/O-3 can trigger a Fenton or Fenton-like reaction, which accelerates the rate of decolorization. The solution pH Of O-3, UV/O-3 and UV/TiO2 Systems declined during decolorization; in contrast, the pH increased to 7.4 in the UV/EC system. The effective energy consumption constant did not increase with the total power input and reached maximum at a total power input of approximately 10- 16 W.

• 出版日期2008