Journal
CHEMICAL ENGINEERING JOURNAL
Volume 406, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126774
Keywords
Cu-EDTA; Non-thermal plasma; Persulfate; Decomplexation
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Funding
- National Natural Science Foundation of China [21976143, 21737003]
- Key R&D Program of Shaanxi Province [2018ZDCXL-N-19-5]
- National Key R&D Program of China [2018YFC1802004, 2018YFC1801003]
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This study developed a novel strategy of coupling non-thermal plasma (NTP) and persulfate (PS) oxidation for decomplexation of Cu-ethylenediaminetetraacetic acid (Cu-EDTA), achieving an obvious synergistic effect. Multiple spectroscopy analyses and Density Functional Theory calculation showed that Cu-O and Cu-N of Cu-EDTA were destroyed in the process.
It is difficult to remove heavy metal-organic complex by conventional chemical precipitation. In this study, a novel strategy of coupling non-thermal plasma (NTP) and persulfate (PS) oxidation was developed for decomplexation of Cu-ethylenediaminetetraacetic acid (Cu-EDTA). An obvious synergistic effect between NTP and PS was achieved, resulting in 126% increase in reaction rate constant at 7 kV compared with single NTP system. PS was effectively activated by ultraviolet irradiation, heat, Cu-EDTA, and Cu2+ generated endogenously in NTP system. O-2(center dot-), O-1(2), center dot OH, and SO4 center dot- contributed to Cu-EDTA decomplexation. Multiple spectroscopy analyses and Density Functional Theory calculation indicated that Cu-O and Cu-N of Cu-EDTA were destroyed. Finally, synergetic decomplexation pathways of Cu-EDTA in the NTP/PS system were proposed.
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