Near-UV photooxidation of As(III) by iron species in the presence of fulvic acid

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Near-UV photooxidation of As(III) by iron species in the presence of fulvic acid. / Pozdnyakov, Ivan P.; Romanova, Tamara E.; Cai, Xiaojiao et al.

In: Chemosphere, Vol. 181, 08.2017, p. 337-342.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{629997378759499b8a6ac2139835696a,

title = "Near-UV photooxidation of As(III) by iron species in the presence of fulvic acid",

abstract = "Photooxidation of As(III) in ternary As(III) – Fe(III) – Fulvic acid system at pH 4 was investigated by optical spectroscopy, steady-state photolysis (365 nm) and atomic-emission spectrometry with inductively coupled plasma techniques. It was found that at all values of [FA]/[Fe] ratio the main photoactive species is [rad]OH radical formed by photolysis of Fe(III) hydroxocomplexes. Addition of fulvic acid leads to mainly negative effect on As(III) photooxidation due to the following reasons: (i) slow dark reduction of photoactive Fe(III) species with formation of scattering particles and photoinert Fe(II) species; (ii) formation of photoreductive Fe(III)-FA complexes incapable to oxidize As(III), (iii) competition of both FA and Fe(III)-FA complexes for UVA quanta with FeOH2+ complex and for [rad]OH radicals with As(III). Aging of ternary system is also very important parameter leading to one order decrease of quantum yields of both Fe(II) formation and As(III) photooxidation.",

keywords = "Arsenate, Arsenite, Fulvic acid, Humic substances, ICP-AES, Iron complexes, Photooxidation, Stationary photolysis, [rad]OH radical, Oxidation-Reduction, Photolysis/radiation effects, Benzopyrans, Oxidants, Photochemical/chemistry, Ultraviolet Rays, Arsenic/chemistry, Iron/chemistry, OXIDATION, (OH)-O-center dot radical",

author = "Pozdnyakov, {Ivan P.} and Romanova, {Tamara E.} and Xiaojiao Cai and Salomatova, {Victoria A.} and Plyusnin, {Victor F.} and Ping Na and Shuvaeva, {Olga V.}",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

year = "2017",

month = aug,

doi = "10.1016/j.chemosphere.2017.04.103",

language = "English",

volume = "181",

pages = "337--342",

journal = "Chemosphere",

issn = "0045-6535",

publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Near-UV photooxidation of As(III) by iron species in the presence of fulvic acid

AU - Pozdnyakov, Ivan P.

AU - Romanova, Tamara E.

AU - Cai, Xiaojiao

AU - Salomatova, Victoria A.

AU - Plyusnin, Victor F.

AU - Na, Ping

AU - Shuvaeva, Olga V.

PY - 2017/8

Y1 - 2017/8

N2 - Photooxidation of As(III) in ternary As(III) – Fe(III) – Fulvic acid system at pH 4 was investigated by optical spectroscopy, steady-state photolysis (365 nm) and atomic-emission spectrometry with inductively coupled plasma techniques. It was found that at all values of [FA]/[Fe] ratio the main photoactive species is [rad]OH radical formed by photolysis of Fe(III) hydroxocomplexes. Addition of fulvic acid leads to mainly negative effect on As(III) photooxidation due to the following reasons: (i) slow dark reduction of photoactive Fe(III) species with formation of scattering particles and photoinert Fe(II) species; (ii) formation of photoreductive Fe(III)-FA complexes incapable to oxidize As(III), (iii) competition of both FA and Fe(III)-FA complexes for UVA quanta with FeOH2+ complex and for [rad]OH radicals with As(III). Aging of ternary system is also very important parameter leading to one order decrease of quantum yields of both Fe(II) formation and As(III) photooxidation.

AB - Photooxidation of As(III) in ternary As(III) – Fe(III) – Fulvic acid system at pH 4 was investigated by optical spectroscopy, steady-state photolysis (365 nm) and atomic-emission spectrometry with inductively coupled plasma techniques. It was found that at all values of [FA]/[Fe] ratio the main photoactive species is [rad]OH radical formed by photolysis of Fe(III) hydroxocomplexes. Addition of fulvic acid leads to mainly negative effect on As(III) photooxidation due to the following reasons: (i) slow dark reduction of photoactive Fe(III) species with formation of scattering particles and photoinert Fe(II) species; (ii) formation of photoreductive Fe(III)-FA complexes incapable to oxidize As(III), (iii) competition of both FA and Fe(III)-FA complexes for UVA quanta with FeOH2+ complex and for [rad]OH radicals with As(III). Aging of ternary system is also very important parameter leading to one order decrease of quantum yields of both Fe(II) formation and As(III) photooxidation.

KW - Arsenate

KW - Arsenite

KW - Fulvic acid

KW - Humic substances

KW - ICP-AES

KW - Iron complexes

KW - Photooxidation

KW - Stationary photolysis

KW - [rad]OH radical

KW - Oxidation-Reduction

KW - Photolysis/radiation effects

KW - Benzopyrans

KW - Oxidants, Photochemical/chemistry

KW - Ultraviolet Rays

KW - Arsenic/chemistry

KW - Iron/chemistry

KW - OXIDATION

KW - (OH)-O-center dot radical

UR - http://www.scopus.com/inward/record.url?scp=85018781672&partnerID=8YFLogxK

U2 - 10.1016/j.chemosphere.2017.04.103

DO - 10.1016/j.chemosphere.2017.04.103

M3 - Article

C2 - 28456035

AN - SCOPUS:85018781672

VL - 181

SP - 337

EP - 342

JO - Chemosphere

JF - Chemosphere

SN - 0045-6535

ER -

ID: 9024786