title: Heterogeneous Fenton-like degradation of an azo dye reactive brilliant orange by the combination of activated carbon-FeOOH catalyst and H(2)O(2).
abstract: The decoloration of an azo dye reactive brilliant orange (X-GN) by a heterogeneous Fenton system using activated carbon-FeOOH catalyst (AC-FeOOH) and H(2)O(2) was studied. Under typical conditions (pH 7.0, H(2)O(2) 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 H(2)O(2) 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 H(2)O(2) and AC-FeOOH process.
authors.affiliation: The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, China. jinhuawu@scut.edu.cn
authors.forename: Jinhua
authors.initials: J
authors.lastname: Wu
authors.forename: Guanghui
authors.initials: G
authors.lastname: Lin
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.forename: Weizhao
authors.initials: W
authors.lastname: Yin
authors.forename: Xiangde
authors.initials: X
authors.lastname: Wang
authors.forename: Bo
authors.initials: B
authors.lastname: Yang
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D001391:Azo Compounds; C045076:Fenton's reagent; C578910:reactive brilliant orange; D006861:Hydrogen Peroxide; D007501:Iron