Aerobic oxidation of arsenite to arsenate by Cu(ii)–chitosan/O2 in Fenton-like reaction, a XANES investigation

Pincus, Lauren N.; Gonzalez, Isabel S.; Stavitski, Eli; Zimmerman, Julie B.

doi:10.1039/d0ew00326c

Title: Aerobic oxidation of arsenite to arsenate by Cu(ii)–chitosan/O₂ in Fenton-like reaction, a XANES investigation

Journal Article · Wed Jan 01 00:00:00 EST 2020 · Environmental Science: Water Research & Technology

DOI:https://doi.org/10.1039/d0ew00326c· OSTI ID:1693395

^[1]; Gonzalez, Isabel S. ^[1]; Stavitski, Eli ^[2];

^[1]

Yale Univ., New Haven, CT (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

Oxidation of inorganic molecules (e.g., arsenite (As(III)) to arsenate (As(V))) by Cu(II)–chitosan in the presence of dissolved oxygen is examined to elucidate the ability and mechanism of Cu(II)–chitosan and Cu(II)–n-TiO₂–chitosan participation in Fenton-like reactions. To form the Cu(II)–chitosan complex, Cu(II) binds with the amine groups of the chitosan backbone resulting in a Cu(II)-complex with cationic behavior. Arsenic is then adsorbed to the copper binding site through a combination of Lewis acid–base coordinate bonding and electrostatics. As K-edge XANES indicate that arsenite is fully oxidized to arsenate when adsorbed to a Cu(II)–chitosan complex in the dark without introduction of a photo- or chemical-oxidant. The oxidation of arsenite by this complex is strongly controlled by the presence of dissolved oxygen as suggested by linear combination fitting where the % As(V) bound decreases from 100% ± 0.0% to 60.2 ± 0.1% upon removal of dissolved oxygen via the freeze pump thaw method. Cu K-edge XANES indicate that Cu(II) acts as a catalyst rather than a reactant, as it remains present as Cu(II) after As oxidation in each system condition examined. For Cu(II)–n-TiO₂–chitosan, the amount of As(III) oxidized to As(V) is strongly controlled by the loading of Cu(II), with a higher loading of Cu(II) leading to more As(III) oxidized and bound on the surface of the adsorbent as As(V). As(III) removal by both Cu(II)–chitosan and Cu(II)–nTiO2–chitosan is significantly improved due to the Fenton-like oxidation of As(III) to As(V). For Cu(II)–n-TiO₂–chitosan, higher loadings of Cu(II) relative to n-TiO₂ lead to greater improvement of As(III) removal performance under oxic vs. anoxic conditions.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; AC02-06CH11357

OSTI ID:: 1693395

Alternate ID(s):: OSTI ID: 1638894

Report Number(s):: BNL-219998-2020-JAAM

Journal Information:: Environmental Science: Water Research & Technology, Vol. 6, Issue 10; ISSN 2053-1400

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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