Effect of Persulfate Activation by Electrogenerated H 2 O 2 and Anodic Oxidation on the Color Removal of Dye Solutions at Pt and BDD Anodes

Yifan Yao, Kai Zhu (), Yucan Liu, Qianjin Liu and Lihua Huang ()
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Yifan Yao: Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Resources and Environment, Linyi University, Linyi 276000, China
Kai Zhu: Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Resources and Environment, Linyi University, Linyi 276000, China
Yucan Liu: School of Civil Engineering, Yantai University, Yantai 264005, China
Qianjin Liu: Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Resources and Environment, Linyi University, Linyi 276000, China
Lihua Huang: Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Resources and Environment, Linyi University, Linyi 276000, China

IJERPH, 2022, vol. 19, issue 23, 1-17

Abstract: In this study, tartrazine solutions were oxidized using innovative electrochemical advanced oxidation processes (EAOPs) that combined persulfate (PS) activation with electrogenerated H 2 O 2 , cathodic reduction and anodic oxidation at Pt and BDD anodes, and graphite cathode in an undivided stirred reactor. For the Pt anode, SO 4 · − was generated from a reduction reaction at the cathode and a reaction between the PS and electrogenerated H 2 O 2 . For the BDD anode, SO 4 · − was generated from a reduction reaction at the cathode, an oxidation reaction at the anode, and a reaction between PS and electrogenerated H 2 O 2 . Among these activation methods, the activation efficiency of PS by electrogenerated H 2 O 2 is much better than other methods. The effects of PS concentration up to 36 mM, applied current density between 6 to 15 mA cm −2, and temperatures between 25 to 45 °C were investigated. For the electro-Fenton process with Pt anode (Pt-H 2 O 2 /PS process), the best result for oxidizing 250 mg L −1 tartrazine solution was obtained with 37.5 mM Na 2 SO 4 + 9.0 mM Na 2 S 2 O 8 , applied current density at 12 mA cm −2 and 45 °C, acquiring total color removal after 30 min reaction. For the electro-Fenton process with BDD anode (BDD-H 2 O 2 /PS process), the best result for oxidizing 250 mg L −1 tartrazine solution was obtained with 25 mM Na 2 SO 4 + 18 mM Na 2 S 2 O 8 , applied current density at 12 mA cm −2 and 45 °C, yielding 100% color removal after 30 min reaction. The main oxidizing agents are SO 4 · − and OH · in the anodic oxidation process with PS and the electro-Fenton process with PS. It is concluded that the additions of PS tremendously improve the oxidation power of electro-Fenton processes with PS, especially the Pt-H 2 O 2 /PS process.

Keywords: anodic oxidation; electrogenerated H 2 O 2; persulfate; hydroxyl radical; sulfate radical (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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