期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 330, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2023.122571
关键词
Carbon dots; Structural defects; Surface oxygen functional groups; Cr(VI) oxyanions; Electron transfer
In this study, the fast transformation mechanism of Cr (VI) oxyanions on CDs with structural defects and surface oxygen functional groups was investigated. The electrons transferred from CDs to reduce Cr (VI) were calculated to be 0.07-0.1 mmol g-1 in 20 min. The reduction kinetics rate driven by carbon defects is approximately 3-5 times faster than that driven by surface oxygen-containing functional groups. Metal cations (K+, Na+, Ca2+, Mg2+) in water matrix showed negligible effect on the reduction of Cr (VI), while iron ions chelate with CDs to form a CD-COOFe complex structure, promoting diffusion and electron transfer simultaneously, enhancing the electron transfer rate constant from 6.94 x 10-3 to 10.00 x 10-3 cm s-1.
Carbon dots (CDs) with dimensional size less than 10 nm have similar constitutional units to black carbon (BC) in natural environment. Herein, we investigated the fast transformation mechanism of Cr (VI) oxyanions on CDs with structural defects and surface oxygen functional groups. The electrons transferred from CDs to reduce Cr (VI) were calculated to be 0.07-0.1 mmol g-1 in 20 min The reduction kinetics rate driven by carbon defects is of approximately 3-5 times faster than that driven by surface oxygen-containing functional groups. Metal cations (K+, Na+, Ca2+, Mg2+) in water matrix showed negligible effect on the reduction of Cr (VI), while iron ions chelate with CDs to form a CD-COOFe complex structure, promoting diffusion and electron transfer simultaneously, enhancing the electron transfer rate constant from 6.94 x 10-3 to 10.00 x 10-3 cm s-1.
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