PbO2 modified BDD electrode by dicationic ionic liquids assisted electrodeposition for efficient electrocatalytic degradation of pesticide wastewater. (16th August 2022)

• Record Type: Journal Article
• Authors: Tang, Yining; Feng, Shangce; He, Deliang
• Is Part Of: Water science and technology. Volume 86:Number 6(2022)
• Page Start: 1540
• Page End: 1550
• Publication Date: 2022-08-16
• Subjects: boron-doped diamond -- carbosulfan -- degradation -- electrochemical oxidation -- pesticide -- thiodicarb; Water -- Pollution; Sewage -- Purification; Water quality management; Periodicals; 628.168
• DOI: 10.2166/wst.2022.256
• Languages: English
• ISSNs: 0273-1223

Abstract

Abstract: Pesticide wastewater is difficult to treat, and it is necessary to develop a new anode material electrochemical oxidation to efficiently degrade pesticide wastewater. DIL-PbO2 -Ti/BDD electrodes with better electrocatalytic oxidation performance were obtained by using dicationic ionic liquid (DIL) for assisted electrodeposition of PbO2 modified boron-doped diamond (BDD) electrodes. At a current density of 100 mA cm −2 and a temperature of 25 °C, the DIL-PbO2 -Ti/BDD electrode was used as anode and titanium plate as cathode. The electrochemical window and oxygen evolution potential (OEP) of the DIL-PbO2 -Ti/BDD electrode obtained by CV testing at a scan rate of 50 mV s −1 in 1 M H2 SO4 were 4.12 and 3.29 V, respectively. Under the conditions of current density of 100 mA cm −2, 25 °C, pH 12, salt content of 8%, chemical oxygen demand (COD) of 24, 280.98 mg L −1, and total nitrogen (TN) content of 5268 mg L −1, after electrification for 12 h, the removal efficiency of COD and TN reached 64.88 and 67.77%, respectively, indicating that the DIL-PbO2 -Ti/BDD electrode has excellent electrocatalytic performance. In order to further understand the mechanism of electrochemical degradation of pesticide wastewater, HPLC-MS was used to detect the intermediates in the degradation process, and the possible degradation pathways were proposed in turn. HIGHLIGHTS: Electrochemical oxidation degradation of pesticide wastewater by DIL-PbO2-Ti/BDD electrode for the first time. The electrochemical window and OEP of the DIL-PbO2-Ti/BDD electrode are 4.12 and 3.29 V, respectively. Putative degradation reaction of carbosulfan and thiodimethoxam by HPLC-MS. Excellent performance in electrochemical catalytic oxidation of pesticide wastewater. Graphical Abstract