Copper-spent activated carbon as a heterogeneous peroxydisulfate catalyst for the degradation of Acid Orange 7 in an electrochemical reactor.
The exhausted activated carbon generated from the adsorption of heavy metal wastewater needs further treatment/disposal. In this study, a new application of copper-spent activated carbon (Cu-AC) was proposed. Cu-AC was used to activate peroxydisulfate (PDS) for the decolorization of Acid Orange 7 (AO7) and electrical current was introduced to enhance the process. The decolorization followed a pseudo-first-order kinetic pattern well (R(2) > 0.95). 92.4% of color removal at 60 min and 38.3% of total organic carbon removal at 180 min were achieved when initial pH value was 9.0, current density was 16 mA/cm(2), PDS concentration was 5 mM and Cu-AC dosage was 0.25 g/L. The radical scavengers including methanol, tert-butanol and phenol, as well as electron paramagnetic resonance test, were employed to investigate the oxidizing species responsible for AO7 decolorization. The stability of Cu-AC was confirmed by three recycle experiments.
Department of Environmental Engineering, Wuhan University, Wuhan 430079, China E-mail: eeng@whu.edu.cn; Shenzhen Research Institute of Wuhan University, Shenzhen 518057, China.
Jing
J
Li
Department of Environmental Engineering, Wuhan University, Wuhan 430079, China E-mail: eeng@whu.edu.cn; Shenzhen Research Institute of Wuhan University, Shenzhen 518057, China.
Heng
H
Lin
Department of Environmental Engineering, Wuhan University, Wuhan 430079, China E-mail: eeng@whu.edu.cn.
Lin
L
Yang
Department of Environmental Engineering, Wuhan University, Wuhan 430079, China E-mail: eeng@whu.edu.cn; Shenzhen Research Institute of Wuhan University, Shenzhen 518057, China.
Hui
H
Zhang
D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry*; D001557:Benzenesulfonates / Q000737:chemistry*; D002384:Catalysis; D002606:Charcoal / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D055664:Electrochemical Techniques; D007220:Industrial Waste; D007700:Kinetics; D010545:Peroxides; D019800:Phenol; D013783:Textile Industry; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry
D001391:Azo Compounds; D001557:Benzenesulfonates; D002606:Charcoal; D003300:Copper; D007220:Industrial Waste; D010545:Peroxides; D019800:Phenol; D062065:Wastewater; D014874:Water Pollutants, Chemical; C014722:2-naphthol orange