TY - JOUR

T1 - [Fe(Ox)3]3- complex as a photodegradation agent at neutral pH

T2 - Advances and limitations

AU - Pozdnyakov, Ivan

AU - Sherin, Peter

AU - Bazhin, Nikolai

AU - Plyusnin, Victor

N1 - Publisher Copyright: © 2017 Elsevier Ltd

PY - 2018/3/1

Y1 - 2018/3/1

N2 - In the present work advances and limitations in the application of Fe(III)-oxalate complexes (namely, [Fe(Ox)3]3-) to the photodegradation of a model persistent organic contaminant - 2,4-dichlorophenoxybutanoic acid (2,4-DB) in neutral aqueous solutions were systematically investigated for the first time. It has been shown that the efficiency of [Fe(Ox)3]3- system greatly depends on the initial concentrations of oxalate ion due to the fast consumption of the ligand during photodegradation process leading to the formation of photochemically less active Fe(III) species. Efficiency of Fe(Ox)3 3− system normalized to UVA absorption at the excitation wavelength is practically independent on [Fe(III)]. Thus, it is highly probable that concentrations of Fe(III) as low as < 10−5 M could be applied in water treatment procedures using reactors with very long optical path. The system also keeps high efficiency at low concentration of pollutant (<10−5 M) though this results in higher relative consumption rate of Fe(III) and oxalate ions.

AB - In the present work advances and limitations in the application of Fe(III)-oxalate complexes (namely, [Fe(Ox)3]3-) to the photodegradation of a model persistent organic contaminant - 2,4-dichlorophenoxybutanoic acid (2,4-DB) in neutral aqueous solutions were systematically investigated for the first time. It has been shown that the efficiency of [Fe(Ox)3]3- system greatly depends on the initial concentrations of oxalate ion due to the fast consumption of the ligand during photodegradation process leading to the formation of photochemically less active Fe(III) species. Efficiency of Fe(Ox)3 3− system normalized to UVA absorption at the excitation wavelength is practically independent on [Fe(III)]. Thus, it is highly probable that concentrations of Fe(III) as low as < 10−5 M could be applied in water treatment procedures using reactors with very long optical path. The system also keeps high efficiency at low concentration of pollutant (<10−5 M) though this results in higher relative consumption rate of Fe(III) and oxalate ions.

KW - 2,4-DB

KW - Ferrioxalate

KW - Hydroxyl radical

KW - Photodegradation

KW - Stationary photolysis

KW - PHOTOCHEMICAL TRANSFORMATION

KW - IRON

KW - OXALATE

KW - HYDROXYL RADICALS

KW - 2,4-DICHLOROPHENOXYACETIC ACID

KW - DEGRADATION

KW - REACTION-MECHANISMS

KW - BISPHENOL-A

KW - PHOTOLYSIS

KW - WATER

KW - Water Purification/instrumentation

KW - Photolysis

KW - 2,4-Dichlorophenoxyacetic Acid/analogs & derivatives

KW - Water Pollutants, Chemical/chemistry

KW - Ferric Compounds/chemistry

KW - Hydrogen-Ion Concentration

KW - Oxalates/chemistry

UR - http://www.scopus.com/inward/record.url?scp=85039739114&partnerID=8YFLogxK

U2 - 10.1016/j.chemosphere.2017.12.096

DO - 10.1016/j.chemosphere.2017.12.096

M3 - Article

C2 - 29289912

AN - SCOPUS:85039739114

VL - 195

SP - 839

EP - 846

JO - Chemosphere

JF - Chemosphere

SN - 0045-6535

ER -