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Photodegradation of Malachite Green Catalyzed by Aqueous Iron(III)‐Citrate Complex: Roles of Iron(II) and Hydrogen Peroxide
Author(s) -
Ou Xiaoxia,
Zhang Fengjie,
Zhang Chunhua,
Zou Xuejun,
Bi Xindan,
Wang Dongfang,
Li Hongcang,
Zhang Shiqi
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201803690
Subject(s) - photodegradation , malachite green , chemistry , hydrogen peroxide , aqueous solution , catalysis , citric acid , reaction rate constant , nuclear chemistry , kinetics , malachite , inorganic chemistry , photochemistry , photocatalysis , organic chemistry , physics , adsorption , quantum mechanics , copper
In this paper, photodegradation experiments of toxic dye malachite green (MG) by Fe(III), citric acid and their complexes were carried out, and the effects of citrate concentration, Fe(III) concentration, solution pH, and initial dye concentration on MG photodegradation were explored. It was found that the maximum removal efficiency of 95.9% could be achieved after 2 h for MG solution of 20 mg/L containing both 0.1 mM Fe(III) and 1 mM citrate. The MG photodegradation process fitted well with pseudo‐first‐order kinetics, and the observed pseudo‐first‐order reaction rate constant (k) was proportional to citrate concentrations. The photochemically formed Fe(II) and H 2 O 2 showed good correlation with MG photodegradation rate by Fe(III)‐citrate complex. The presence of citrate enhanced the photoformation of Fe(II) and H 2 O 2 , and the continuous production of hydroxyl radical (•OH) played an important role in MG photodegradation.