TY - JOUR

T1 - Photolysis of Fe(III) complex with ethylenediamine-N,N′-disuccinic acid and its efficiency in generation of •OH radical

AU - Belikov, Yury A.

AU - Snytnikova, Olga A.

AU - Grivin, Vyacheslav P.

AU - Plyusnin, Victor F.

AU - Xu, Jing

AU - Wu, Feng

AU - Pozdnyakov, Ivan P.

N1 - Funding Information: The financial support of the Russian Science Foundation (Grant RSF-NSFC № 21-43-00004 ) and the National Natural Science Foundation of China (Grant NSFC-RSF 22061132001 ) is gratefully acknowledged. Publisher Copyright: © 2022 Elsevier Ltd

PY - 2022/12

Y1 - 2022/12

N2 - The mechanism of photolysis of the Fe(III) complex with ethylenediamine-N,N′-disuccinic acid ([FeEDDS]-) was revealed using a combination of time resolved and stationary photochemical methods. Using laser flash photolysis (λex = 355 nm), the formation of the primary intermediate, the radical complex of Fe(II) with quantum yield (φ0 = 0.21) was detected for the first time. The lifetime (1.8 ms) and the spectral characteristics (λmax = 520 nm, ε520 nm = 160 M−1cm−1) of this intermediate were also determined. The dependence of the quantum yield of photolysis of the [FeEDDS]- complex (φFeEDDS) and the hydroxyl radical quantum yield (φOH) on the excitation wavelength, pH, and concentrations of the ligand and iron ions were obtained for the first time. It has been established that under optimal conditions at neutral pH, the value of φFeEDDS is about 0.8, and φOH is about 0.15. It was found that φFeEDDS does not depend on the initial concentrations of Fe(III), EDDS, but depends on pH, the excitation wavelength and the presence of oxygen. φOH does not depend on the initial concentrations of Fe(III), EDDS, but depends on pH and the excitation wavelength. The high φOH values make the [FeEDDS]- complex a suitable system for the generation of •OH radical at neutral pH under UV radiation.

AB - The mechanism of photolysis of the Fe(III) complex with ethylenediamine-N,N′-disuccinic acid ([FeEDDS]-) was revealed using a combination of time resolved and stationary photochemical methods. Using laser flash photolysis (λex = 355 nm), the formation of the primary intermediate, the radical complex of Fe(II) with quantum yield (φ0 = 0.21) was detected for the first time. The lifetime (1.8 ms) and the spectral characteristics (λmax = 520 nm, ε520 nm = 160 M−1cm−1) of this intermediate were also determined. The dependence of the quantum yield of photolysis of the [FeEDDS]- complex (φFeEDDS) and the hydroxyl radical quantum yield (φOH) on the excitation wavelength, pH, and concentrations of the ligand and iron ions were obtained for the first time. It has been established that under optimal conditions at neutral pH, the value of φFeEDDS is about 0.8, and φOH is about 0.15. It was found that φFeEDDS does not depend on the initial concentrations of Fe(III), EDDS, but depends on pH, the excitation wavelength and the presence of oxygen. φOH does not depend on the initial concentrations of Fe(III), EDDS, but depends on pH and the excitation wavelength. The high φOH values make the [FeEDDS]- complex a suitable system for the generation of •OH radical at neutral pH under UV radiation.

KW - FeEDDS

KW - Hydroxyl radical

KW - Laser flash photolysis

KW - Primary intermediate

KW - Quantum yield

UR - http://www.scopus.com/inward/record.url?scp=85139289324&partnerID=8YFLogxK

U2 - 10.1016/j.chemosphere.2022.136657

DO - 10.1016/j.chemosphere.2022.136657

M3 - Article

C2 - 36191772

AN - SCOPUS:85139289324

VL - 309

JO - Chemosphere

JF - Chemosphere

SN - 0045-6535

IS - Pt 1

M1 - 136657

ER -