Construction of Modified Graphite Felt Electrode and its Adsorption Mechanism for UO22+
Uranium-containing wastewater from the nuclear fuel cycle poses severe hazards to human health and the ecological environment.In this study,a carboxylated multi-walled carbon nanotube/copper oxide/nano-silver-modified graphite felt(MCA)electrode material was prepared.Capacitive deionization(CDI)experiments were conducted to sys-tematically investigate the electrosorption performance of UO22+using electrodes modified with different composite materials,as well as the effects of various operating conditions(voltage,pH,UO22+concentration,etc.)on the electrosorption performance of the MCA-2 electrode.The adsorption mechanism of UO22+was explored.Results showed that among the different modified electrodes,MCA-2 exhibited the highest UO22+removal efficiency,reaching 93.39%.MCA-2 is a high-capacitance hybrid electrode with both electrical double layer(EDL)and pseudocapacitive properties.It maintained high removal efficiency for UO22+across a wide range of voltage,pH,and concentration conditions.The results showed that MCA-2 could effectively remove uranium from aqueous solution by electrosorption.
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