Development of a Three-Dimensional Electrochemical System Using a Blue TiO2/SnO2–Sb2O3 Anode for Treating Low-Ionic-Strength Wastewater

• DOI: 10.1021/acs.est.9b05488
• Publication Date: 2019-11-05T16:31:25Z
• Authors: Xiaoyang Meng; Zefang Chen; Can Wang; Weiqiu Zhang; Kaihang Zhang; Shiqing Zhou; Jinming Luo; Nian Liu; Dandan Zhou; Duo Li; John Crittenden
• Keywords: Osmolar Concentration; Electrochemical Techniques; Hydrogen Peroxide; Wastewater; Electrodes; Oxidation-Reduction; 01 natural sciences; Water Pollutants, Chemical; 6. Clean water; 0105 earth and related environmental sciences

Reducing energy use is crucial to commercialize electrochemical oxidation technologies. We developed a three-dimensional (3-D) system that can significantly reduce the applied voltage and effectively degrade organic contaminants in low-ionic-strength wastewaters. The 3-D consisted of composite wire mesh anode (composed blue TiO2 nanotubes covered with SnO2–Sb2O3), proton exchange membrane, stainless-steel cathode, which were compressed firmly together. For system, we placed electrode toward wastewater flowed past anode. Both two-dimensional (2-D) systems had same cathode. found could by 75.7% electrical efficiency per log order reduction (EE/O) 73% for 0.001 M Na2SO4. Na2SO4 concentrations greater than 0.05 M, 2-D slightly lower EE/O. also compared EE/O advanced processes (EAOPs) other (UV/H2O2, UV/persulfate, O3/H2O2, UV/ TiO2, UV/chlorine). EAOPs have much higher low BA (20 mg/L) high (2000 mg/L).