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Title: Sulfate radical oxidation of aromatic contaminants: a detailed assessment of density functional theory and high-level quantum chemical methods

Journal Article · · Environmental Science: Processes & Impacts
DOI:https://doi.org/10.1039/C7EM00009J· OSTI ID:1483459
 [1];  [1]; ORCiD logo [1]; ORCiD logo [2]
  1. Univ. of California, Riverside, CA (United States). Department of Chemical & Environmental Engineering
  2. Univ. of California, Riverside, CA (United States). Department of Chemical & Environmental Engineering and Materials Science & Engineering Program

We present that advanced oxidation processes that utilize highly oxidative radicals are widely used in water reuse treatment. In recent years, the application of sulfate radical (SO4˙-) as a promising oxidant for water treatment has gained increasing attention. To understand the efficiency of SO4˙- in the degradation of organic contaminants in wastewater effluent, it is important to be able to predict the reaction kinetics of various SO4˙--driven oxidation reactions. In this study, we utilize density functional theory (DFT) and high-level wavefunction-based methods (including computationally-intensive coupled cluster methods), to explore the activation energies of SO4˙--driven oxidation reactions on a series of benzene-derived contaminants. Additionally, these high-level calculations encompass a wide set of reactions including 110 forward/reverse reactions and 5 different computational methods in total. Based on the high-level coupled-cluster quantum calculations, we find that the popular M06-2X DFT functional is significantly more accurate for OH- additions than for SO4˙- reactions. Most importantly, we highlight some of the limitations and deficiencies of other computational methods, and we recommend the use of high-level quantum calculations to spot-check environmental chemistry reactions that may lie outside the training set of the M06-2X functional, particularly for water oxidation reactions that involve SO4˙- and other inorganic species.

Research Organization:
Univ. of California, Riverside, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0016269
OSTI ID:
1483459
Journal Information:
Environmental Science: Processes & Impacts, Vol. 19, Issue 3; ISSN 2050-7887
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 48 works
Citation information provided by
Web of Science

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