Degradation of Auramine-O in Aqueous Solution by Ti/PbO 2 -Electro-Fenton Process by Hydrogen Peroxide Produced In Situ
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RESEARCH PAPER
Degradation of Auramine-O in Aqueous Solution by Ti/PbO2-ElectroFenton Process by Hydrogen Peroxide Produced In Situ Wenhui Sun1
•
Yingwu Yao1
Received: 29 April 2020 / Accepted: 31 August 2020 Ó Shiraz University 2020
Abstract Electrochemical removal of synthesis solution containing 50 mg/L auramine-O through Ti/PbO2 electrodes and carbon felt air-diffusion electrode to in situ generate hydrogen peroxide (H2O2) by the oxygen (O2) reduction. The effects of operating conditions, FeSO47H2O concentrations, current density, initial concentration, initial pH value and sodium sulfate (Na2SO4) concentration were investigated. For reaction of 60 min, the auramine-O removal rate reached 99% and total organic carbon (TOC) removal rate was close to 64.27%. This means that the organic macromolecules in the pollutants have been completely destroyed and broken down. The degradation of auramine-O under electro-Fenton (EF) process using Ti/PbO2carbon felt was analyzed from the dimensions of TOC, mineralization current efficiency, energy consumption, degradation mechanism and kinetics. Comparing EF-Ti/PbO2 with Ti/PbO2 anode, AO (anodic oxidation)-Ti/PbO2 anodic oxidation using Ti/PbO2 anode and EF-Pt EF process with Pt anode, the consequences demonstrated that Ti/PbO2-EF process by hydrogen peroxide produced in situ was the best choice than others. Keywords Ti/PbO2 anode Electro-Fenton Auramine-O H2O2 Mineralization TOC
1 Introduction Because synthetic organic dyes were poisonous and difficult to remove, untreated textile wastewater treatment had always been a major problem of visual and environmental pollution. In regard to the environment, synthetic organic dyes can seriously damage the quality of aquatic ecosystems and drinking water (Sennaoui et al. 2018), and it was estimated that tons of wastewater from all over the world were discharged into rivers and streams (Martı´nez-Huitle and Panizza 2018). It was worth noting that synthetic dyes were resistant to chemical, biochemical and chemical deformations (Oturan et al. 2009; Farooqa et al. 2019), and what is more, these too complicated the degradation and decolorization effectively (Tang et al. 2019; Panizza and & Yingwu Yao [email protected] Wenhui Sun [email protected] 1
School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, People’s Republic of China
Oturan 2011). The decoloration can be achieved by reducing them to nontoxic molecule groups by means of electrochemical reduction (Bandyopadhyay et al. 2019). In recent years, there has been great interest in the disposal of wastewater containing a large amount of organic contamination through electrochemical technology (Oturan 2014). Advanced oxidation processes (AOPS) such as Fenton, ozone oxidation, photochemical oxidation, and so on provided effective methods to remove color and destroy the synthetic dye molecules (Arredondo Valdez et al. 2012). Several works had proved that adding Fe2? with H2O2 genera
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