Degradation of Methylene Blue in Water by Combined Sonolysis and Fenton's Reaction

作者：Xing Tie Ling; Chen Guo Qiang^*; Irl Josef; Chu Khim H

来源：AATCC Review, 2009, 9(2): 37-40.

• Decolorization
• Degradation
• Dyes
• Fenton's Reaction
• Methylene Blue
• Ultrasound

The degradation of methylene blue, a cationic dye, upon exposure to ultrasound at 24 kHz using a direct immersion ultrasonic probe was investigated. The rate of decolorization for a 5 mg/L aqueous dye solution at 20C and 200W/L power density followed pseudo first-order kinetics with a rate constant of 0.014 min(-1). This was increased by a factor of 3.4 when small amounts of ferrous ion (Fe(II), 1 mg/L) were added. At an initial dye concentration of 50 mg/L, 92% decolorization and 60% chemical oxygen demand (COD) reduction was achieved after 360 min sonication. The rate enhancement was attributed to the reaction of Fe(II) with sonochemically-generated hydrogen peroxide (H(2)O(2)) via the classical Fenton's reaction, thereby degrading nonvolatile toxic compounds such as methylene blue.

• 出版日期2009-2
• 单位苏州大学