Electrochemical Oxidation of Atrazine and Clothianidin on Bi-doped SnO2 -Ti n O2 n-1 Electrocatalytic Reactive Electrochemical Membranes

Environmental Science & Technology
Pralay GayenBrian P Chaplin

Abstract

This research focused on improving mineralization rates during the advanced electrochemical oxidation treatment of agricultural water contaminants. For the first time, bismuth-doped tin oxide (BDTO) catalysts were deposited on Magnéli phase (Ti nO2 n-1, n = 4-6) reactive electrochemical membranes (REMs). Terephthalic acid (TA) was used as a OH• probe, whereas atrazine (ATZ) and clothianidin (CDN) were chosen as model agricultural water contaminants. The BDTO-deposited REMs (REM/BDTO) showed higher compound removal than the REM, due to enhanced OH• production. At 3.5 V/SHE, complete mineralization of TA, ATZ, and CDN was achieved for the REM/BDTO upon a single pass in the reactor (residence time ∼3.6 s). Energy consumption for REM/BDTO was as much as 31-fold lower than the REM, with minimal values per log removal of <0.53 kWh m-3 for TA (3.5 V/SHE), <0.42 kWh m-3 for ATZ (3.0 V/SHE), and 0.83 kWh m-3 for CDN (3.0 V/SHE). Density functional theory simulations provided potential dependent activation energy profiles for ATZ, CDN, and various oxidation products. Efficient mass transfer and a reaction mechanism involving direct electron transfer and reaction with OH• were responsible for the rapid and complete mineralization of ATZ a...Continue Reading

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Citations

Jul 1, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Sara ArabiValetta Saldanha
Aug 14, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Song WangXiaoling Cao
Dec 2, 2020·Proceedings of the National Academy of Sciences of the United States of America·Pralay GayenVijay K Ramani
Dec 29, 2020·Chemosphere·Renato Montenegro-AyoSergi Garcia-Segura
Aug 9, 2021·Water Research·Luis Baptista-PiresJelena Radjenovic
Nov 17, 2020·Environmental Science & Technology·Jelena RadjenovicBrian P Chaplin
Feb 16, 2019·Accounts of Chemical Research·Brian P Chaplin
Dec 27, 2019·Environmental Science & Technology·Soroush AlmassiBrian P Chaplin

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