Simultaneous removal of sulfamethazine and sulfate via electrochemical oxidation and capacitive Deionization: Mechanisms of in-situ activation and strategies of the …

Y Ge, X Li, Z Zheng, J Ke, H Zhao, Y Liu, R Guo… - Separation and …, 2024 - Elsevier
Y Ge, X Li, Z Zheng, J Ke, H Zhao, Y Liu, R Guo, J Chen
Separation and Purification Technology, 2024Elsevier
Electrochemical oxidation (EO) is a well-established method for pollutants removal.
However, excessive addition of oxidant during EO may cause secondary pollution.
Moreover, the unprocessed ions in the wastewater can cause further contamination. This
research introduces a hybrid process that combines EO with capacitive deionization (CDI),
in situ catalytically utilizing sulfate (SO 4 2-) and removing sulfamethazine (SMZ). This
process realized by layered porous MXene-modified biochar electrodes (BCM) that …
Abstract
Electrochemical oxidation (EO) is a well-established method for pollutants removal. However, excessive addition of oxidant during EO may cause secondary pollution. Moreover, the unprocessed ions in the wastewater can cause further contamination. This research introduces a hybrid process that combines EO with capacitive deionization (CDI), in situ catalytically utilizing sulfate (SO42-) and removing sulfamethazine (SMZ). This process realized by layered porous MXene-modified biochar electrodes (BCM) that demonstrate electrocatalytic and adsorption properties. The electrochemical oxidation system, constructed using BCM cathode and boron-doped diamond anode, harnesses in situ generation of oxidants from SO42-, leading to the complete degradation of 30 mg/L sulfamethazine in 30 min through adsorbed radicals and metastable active species at the biphasic interface. Subsequently, the BCM-2 exhibits excellent CDI performance at 1.2 V, achieving a desalination capacity of 15.40–65.97 mg/g in 100–1000 mg/L Na2SO4 solution. By combining EO with CDI, BCM simultaneously removes sulfamethazine and sulfate, resulting in a 60 % reduction in total organic carbon and a 14.4 % decrease in electrical conductivity after one process cycle. Moreover, BCM exhibits favorable cytocompatibility.
Elsevier
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