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Operando Studies of Iodine Species in an Advanced Oxidative Water Treatment Reactor
https://orcid.org/0000-0002-1269-6119
https://orcid.org/0000-0002-3894-9970
https://orcid.org/0000-0003-2634-0647
https://orcid.org/0000-0003-2172-2507
We present an electrochemical advanced oxidation process (eAOP) reactor employing expanded graphite, potassium iodide (KI), and electrical current, which demonstrates an exceptionally high rate of inactivation of Escherichia coli (106 or 6 log10 reduction in viable cells) at a low current density (0.12 mA/cm2), with a short contact time (5 min) and a low concentration of KI (10 ppm, 0.06 mM). Advanced spectroscopic and electrochemical methods were used to study the reactor during operation. Operando X-ray fluorescence mapping is used to show the distribution of iodine species in the reactor, and operando X-ray absorption spectroscopy in the anodic chamber reveals iodine species with an effective oxidation state higher than IO4 –. Operando electrochemical measurements confirm that the conditions in the anodic chambers are favorable for the creation of highly oxidized iodine products. The killing efficiency of this new eAOP reactor far exceeds that expected from either traditional iodine-based electrochemical water treatment or advanced oxidation systems alone, a phenomenon that may be associated with the production of highly oxidized iodine species reported here.
We present a new iodine-based electrochemical water treatment system and study it during operation to investigate its exceptional performance.
Operando Studies of Iodine Species in an Advanced Oxidative Water Treatment Reactor
https://orcid.org/0000-0002-1269-6119
https://orcid.org/0000-0002-3894-9970
https://orcid.org/0000-0003-2634-0647
https://orcid.org/0000-0003-2172-2507
We present an electrochemical advanced oxidation process (eAOP) reactor employing expanded graphite, potassium iodide (KI), and electrical current, which demonstrates an exceptionally high rate of inactivation of Escherichia coli (106 or 6 log10 reduction in viable cells) at a low current density (0.12 mA/cm2), with a short contact time (5 min) and a low concentration of KI (10 ppm, 0.06 mM). Advanced spectroscopic and electrochemical methods were used to study the reactor during operation. Operando X-ray fluorescence mapping is used to show the distribution of iodine species in the reactor, and operando X-ray absorption spectroscopy in the anodic chamber reveals iodine species with an effective oxidation state higher than IO4 –. Operando electrochemical measurements confirm that the conditions in the anodic chambers are favorable for the creation of highly oxidized iodine products. The killing efficiency of this new eAOP reactor far exceeds that expected from either traditional iodine-based electrochemical water treatment or advanced oxidation systems alone, a phenomenon that may be associated with the production of highly oxidized iodine species reported here.
We present a new iodine-based electrochemical water treatment system and study it during operation to investigate its exceptional performance.
Operando Studies of Iodine Species in an Advanced Oxidative Water Treatment Reactor
https://orcid.org/0000-0002-1269-6119
https://orcid.org/0000-0002-3894-9970
https://orcid.org/0000-0003-2634-0647
https://orcid.org/0000-0003-2172-2507
We present an electrochemical advanced oxidation process (eAOP) reactor employing expanded graphite, potassium iodide (KI), and electrical current, which demonstrates an exceptionally high rate of inactivation of Escherichia coli (106 or 6 log10 reduction in viable cells) at a low current density (0.12 mA/cm2), with a short contact time (5 min) and a low concentration of KI (10 ppm, 0.06 mM). Advanced spectroscopic and electrochemical methods were used to study the reactor during operation. Operando X-ray fluorescence mapping is used to show the distribution of iodine species in the reactor, and operando X-ray absorption spectroscopy in the anodic chamber reveals iodine species with an effective oxidation state higher than IO4 –. Operando electrochemical measurements confirm that the conditions in the anodic chambers are favorable for the creation of highly oxidized iodine products. The killing efficiency of this new eAOP reactor far exceeds that expected from either traditional iodine-based electrochemical water treatment or advanced oxidation systems alone, a phenomenon that may be associated with the production of highly oxidized iodine species reported here.
We present a new iodine-based electrochemical water treatment system and study it during operation to investigate its exceptional performance.
Operando Studies of Iodine Species in an Advanced Oxidative Water Treatment Reactor
Moustafa, Ahmed (author) / Evans, Alex (author) / Hofstetter, Simmon (author) / Boutros, Jenny (author) / Pourrezaei, Parastoo (author) / Zhang, Cheng (author) / Patterson-Fortin, Laura (author) / Laing, Charles (author) / Goertzen, Carter (author) / Smith, Richard (author)
ACS ES&T Water ; 1 ; 2293-2304
2021-11-12
Article (Journal)
Electronic Resource
English
Behavior of iodine species in oxidative processes during drinking water treatment
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