TY - JOUR

T1 - Synergetic effect of potassium persulfate on photodegradation of para-arsanilic acid in Fe(III) oxalate system

AU - Tyutereva, Yuliya E.

AU - Sherin, Petr S.

AU - Polyakova, Evgeniya V.

AU - Grivin, Vyacheslav P.

AU - Plyusnin, Victor F.

AU - Shuvaeva, Olga V.

AU - Xu, Jing

AU - Wu, Feng

AU - Pozdnyakov, Ivan P.

N1 - Funding Information: Russian Science Foundation (Grant RSF-NSFC № 21–43-00004) and the National Natural Science Foundation of China (Grant NSFC-RSF 22061132001). Publisher Copyright: © 2021 Elsevier B.V.

PY - 2021/11/1

Y1 - 2021/11/1

N2 - The p-arsanilic acid (p-ASA) is widely used in agriculture as a food additive to control parasites. It leaves the body almost unchanged and is subsequently destroyed by environmental factors with the formation of toxic forms of inorganic arsenic. UVA irradiation of p-ASA with the addition of the Fe(III) oxalate complex leads to an effective photodegradation of the target compound. However, this method needs high concentrations of reagents and the keeping high [oxalate]:[Fe(III)] ratio to maintain proper efficiency of Fe(III) oxalate system. In this work, to overcome these problems, potassium persulfate (PS) was used as an additional oxidizer to improve Fe(III) oxalate system. It was found that the sulfate radical produced upon PS activation reacts readily with both neutral and monoanionic forms of p-ASA yielding corresponding organic cation radical, bimolecular rate constants are (7.3 ± 0.6) × 109 and (2.4 ± 0.4) × 109 M−1s−1, accordingly. Addition of 1 mM of PS reduces to one order (from 1.6 to 0.12 mM) the working concentration of oxalate and allows to achieve the complete degradation of both p-ASA and organic byproducts to inorganic As(V). Also the proposed approach demonstrates high efficiency in a wide range (from <0.5 to 3 ppm) of p-ASA concentrations.

AB - The p-arsanilic acid (p-ASA) is widely used in agriculture as a food additive to control parasites. It leaves the body almost unchanged and is subsequently destroyed by environmental factors with the formation of toxic forms of inorganic arsenic. UVA irradiation of p-ASA with the addition of the Fe(III) oxalate complex leads to an effective photodegradation of the target compound. However, this method needs high concentrations of reagents and the keeping high [oxalate]:[Fe(III)] ratio to maintain proper efficiency of Fe(III) oxalate system. In this work, to overcome these problems, potassium persulfate (PS) was used as an additional oxidizer to improve Fe(III) oxalate system. It was found that the sulfate radical produced upon PS activation reacts readily with both neutral and monoanionic forms of p-ASA yielding corresponding organic cation radical, bimolecular rate constants are (7.3 ± 0.6) × 109 and (2.4 ± 0.4) × 109 M−1s−1, accordingly. Addition of 1 mM of PS reduces to one order (from 1.6 to 0.12 mM) the working concentration of oxalate and allows to achieve the complete degradation of both p-ASA and organic byproducts to inorganic As(V). Also the proposed approach demonstrates high efficiency in a wide range (from <0.5 to 3 ppm) of p-ASA concentrations.

KW - AOPs

KW - Fe(III) oxalate

KW - Hydroxyl radical

KW - Laser flash photolysis

KW - p-ASA

KW - Photodegradation

KW - Sulfate radical

UR - http://www.scopus.com/inward/record.url?scp=85113929848&partnerID=8YFLogxK

U2 - 10.1016/j.jphotochem.2021.113507

DO - 10.1016/j.jphotochem.2021.113507

M3 - Article

AN - SCOPUS:85113929848

VL - 420

JO - Journal of Photochemistry and Photobiology A: Chemistry

JF - Journal of Photochemistry and Photobiology A: Chemistry

SN - 1010-6030

M1 - 113507

ER -