Key Laboratory Of Environmental Protect And Eco Remediation Of Guangdong Reg Higher Educ Institutions

Laboratory of, China

Key Laboratory Of Environmental Protect And Eco Remediation Of Guangdong Reg Higher Educ Institutions

Laboratory of, China
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Wu J.,Key Laboratory Of Environmental Protect And Eco Remediation Of Guangdong Reg Higher Educ Institutions | Wu J.,South China University of Technology | Lin G.,Key Laboratory Of Environmental Protect And Eco Remediation Of Guangdong Reg Higher Educ Institutions | Li P.,Key Laboratory Of Environmental Protect And Eco Remediation Of Guangdong Reg Higher Educ Institutions | And 3 more authors.
Water Science and Technology | Year: 2013

The decoloration of an azo dye reactive brilliant orange (X-GN) by a heterogeneous Fenton system using activated carbon-FeOOH catalyst (AC-FeOOH) and H2O2 was studied. Under typical conditions (pH 7.0, H2O2 10 mmol/L, AC-FeOOH 1.0 g/L and 30 °C), 98% decoloration rate of X-GN was achieved in 240 min. The decoloration efficiency of X-GN increased with higher H2O2 dosage, higher AC-FeOOH dosage and higher reaction temperature. Though the catalytic reaction was an acid driven process, a sufficient decoloration performance was still obtained in neutral and alkaline conditions. Kinetic studies suggested that the decoloration of X-GN followed a pseudo-first order reaction and the activation energy was 17.2 kJ/mol. Iron leaching from AC-FeOOH occurred during the reaction, but the decoloration efficiency of X-GN was still higher than 80% after four runs. The AC-FeOOH has a good stability and can be reused. Besides, the generation of massive iron-containing sludge can be avoided after reaction as the remaining ferric ions in the solution were less than 1 mg/L in this combined H2O2 and AC-FeOOH process. © IWA Publishing 2013.

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