Performance and mechanism of Ni-EDTA decomplexing by three-dimensional electrocatalysis
Three-dimensional electrocatalysis is an efficient technology for treating organic wastewater containing metal complexes,but the decomplexation mechanism is still unclear.This study constructed a three-dimensional electrocatalytic system to decomplex simulated wastewater containing Ni-EDTA complex,with ruthenium and iridium coated titanium plate as the anode,and stainless steel plate as the cathode.The results indicated that the removal rate of Ni-EDTA is related to the type of electrolyte,electrolyte concentration,current density,and initial pH,and all complied with the second-order reaction kinetics.The highest removal rates of Ni-EDTA and COD were 85.05％and 80.48％,respectively with NaCl solution as the electrolyte and concentration of 0.25g/L,under 1.0mA/cm2 current density,and an initial pH of 3.0.The rate constants were 0.0053min 1 and R2 was 0.9893.Electrochemical testing showed that the addition of particle electrodes increased the catalytic active sites,catalytic reaction mass transfer area,and charge storage sites,enhanced electron transfer,and improved the electrocatalytic performance.By using three-dimensional fluorescence spectroscopy,ultraviolet spectroscopy,and active component identification,the degradation process of EDTA was analyzed to reveal the efficient mechanism of three-dimensional electrocatalysis for Ni-EDTA decomplexing.This work provides a theoretical basis and technical support for the treatment of metal-complexed organic wastewater.
three-dimensional electrode systemNi-EDTA wastewaterdecomplexing mechanismeffect and energy consumption of decomplexationkinetics
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