Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 51, Issue 17, Pages 10090-10099Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.7b02519
Keywords
-
Categories
Funding
- National Research Foundation of Korea grant - Korea Government [NRF-2017R1A2B4002235]
- National Research Foundation of Korea - Ministry of Science, ICT, and Future Planning [2016M3A7B4909318]
- Korea Ministry of Environment as Advanced Industrial Technology Development Project [2017000140005]
- Korea Ministry of Environment as The GAIA Project [2016000550007]
- Korea Environmental Industry & Technology Institute (KEITI) [ARQ201702063001] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ask authors/readers for more resources
This study elucidates the mechanism behind persulfate activation by exploring the role of various oxyanions (e.g., peroxymonosulfate, periodate, and peracetate) in two activation systems utilizing iron nanoparticle (nFe(0)) as the reducing agent and single-wall carbon nanotubes (CNTs) as electron transfer mediators. Since the tested oxyanions serve as both electron acceptors and radical precursors in most cases, oxidative degradation of organics was achievable through one-electron reduction of oxyanions on nFe(0) (leading to radical-induced oxidation) and electron transfer mediation from organics to oxyanions on CNTs (leading to oxidative decomposition involving no radical formation). A distinction between degradative reaction mechanisms of the nFe(0)/oxyanion and CNT/oxyanion systems was made in terms of the oxyanion consumption efficacy, radical scavenging effect, and EPR spectral analysis. Statistical study of substrate-specificity and product distribution implied that the reaction route induced on nFe(0) varies depending on the oxyanion (i.e., oxyanion-derived radical), whereas the similar reaction pathway initiates organic oxidation in the CNT/oxyanion system irrespective of the oxyanion type. Chronoamperometric measurements further confirmed electron transfer from organics to oxyanions in the presence of CNTs, which was not observed when applying nFe(0) instead.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available