کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5745984 | 1618788 | 2017 | 8 صفحه PDF | دانلود رایگان |
- Cr(III) was efficiently oxidized by the in-situ electro-generated ROS.
- Graphitized MWCNTs exhibit excellent ORR catalytic behavior.
- Graphitization process significantly improves 2e ORR for the carbon nanotubes.
- Novel Cr(III)-induced electro-Fenton-like systems were successfully developed.
Alkaline electrochemical advanced oxidation processes for chromium oxidation and Cr-contaminated waste disposal were reported in this study. The highly graphitized multi-walled carbon nanotubes g-MWCNTs modified electrode was prepared for the in-situ electrochemical generation of HO2â. RRDE test results illustrated that g-MWCNTs exhibited much higher two-electron oxygen reduction activity than other nanocarbon materials with peak current density of 1.24 mA cmâ2, %HO2â of 77.0% and onset potential of â0.15 V (vs. Hg/HgO). It was originated from the highly graphitized structure and good electrical conductivity as illustrated from the Raman, XRD and EIS characterizations, respectively. Large amount of reactive oxygen species (HO2â and ·OH) were in-situ electro-generated from the two-electron oxygen reduction and chromium-induced alkaline electro-Fenton-like reaction. The oxidation of Cr(III) was efficiently achieved within 90 min and the conversion ratio maintained more than 95% of the original value after stability test, offering an efficient and green approach for the utilization of Cr-containing wastes.
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Journal: Chemosphere - Volume 183, September 2017, Pages 156-163