Open AccessCatalytic peroxidation of acrylic acid from aqueous solution incorporated with highly active La0.5Sr0.5BO3 (B=Cu, Fe and Ni) perovskite-like catalysts
Author(s) -
Arvind Kumar,
B. Prasad,
Krishan Kishor Garg
Publication year - 2020
Publication title -
journal of environmental health science and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
ISSN - 2052-336X
DOI - 10.1007/s40201-020-00514-8
Subject(s) - acrylic acid , catalysis , chemistry , x ray photoelectron spectroscopy , radical , nuclear chemistry , singlet oxygen , fourier transform infrared spectroscopy , inorganic chemistry , oxygen , organic chemistry , chemical engineering , copolymer , engineering , polymer
In the current study, catalytic behaviour of La 0.5 Sr 0.5 BO 3 (B=Cu, Fe and Ni) perovskite-like catalysts synthesized by sol-gel method were examined in catalytic peroxidation of acrylic acid as a model organic compound and further characterized by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) with energy dispersive X-ray (EDX), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The effect of various parameters such as catalyst dose, H 2 O 2 /acrylic acid molar ratio, temperature, pH and initial acrylic acid concentration on acrylic acid and COD removal was studied. The maximum acrylic acid and COD removal of 86.79% and 71.57% were observed at optimum operating conditions (e.g., La 0.5 Sr 0.5 CuO 3 catalyst dose = 600 mg/L, stoichiometric molar ratio of H 2 O 2 /acrylic acid = 1.5, pH = 3, temperature 65 °C and reaction time = 3 h). The ROS scavenging studies were performed to identify in-situ generated reactive oxidant species, e.g., hydroxyl radicals ( • OH), superoxide radicals (O 2 •־ ) and singlet oxygen ( 1 O 2 ) and treated with their respective quencher during catalytic peroxidation of acrylic acid. Acrylic acid removal kinetics was performed by first order and Langmuir-Hinshelwood kinetic models. The plausible degradation mechanism was proposed based on intermediates identified by GC-MS analysis during catalytic peroxidation of acrylic acid.