Ionic liquid-assisted synthesis of a novel PANI/ZnWO4/WO3 ternary nanocomposite: a facile double electron transfer photocatalyst for efficient degradation of a herbicide

This study reports a novel, efficient, and non-toxic polyaniline–ZnWO4–WO3 (PZW) ternary nanocomposite, synthesized following an ionic liquid (IL)-assisted in situ oxidative polymerization method. The as-prepared nanocomposite was utilized towards improved photocatalytic wastewater treatment and tox...

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Bibliographic Details
Published in:Environmental science. Nano 2021-09, Vol.8 (9), p.2676-2692
Main Authors: Barik, Bapun, Mishra, Monalisa, Dash, Priyabrat
Format: Article
Language:English
Subjects:
Conducting polymers
Current carriers
Degradation
Dyes
Electrochemistry
Electron transfer
Glyphosate
Herbicides
Ionic liquids
Nanocomposites
Nanostructure
Oxidoreductions
Photocatalysis
Photodegradation
Polyanilines
Polymerization
Polymers
Reactive oxygen species
Structural integrity
Toxicity
Wastewater treatment
X ray photoelectron spectroscopy
Zinc tungstates
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Summary:This study reports a novel, efficient, and non-toxic polyaniline–ZnWO4–WO3 (PZW) ternary nanocomposite, synthesized following an ionic liquid (IL)-assisted in situ oxidative polymerization method. The as-prepared nanocomposite was utilized towards improved photocatalytic wastewater treatment and toxicity removal. Initially, individual ZnWO4 and WO3 nanostructures were synthesized using an IL-assisted solvothermal method. Thereafter, the subsequent modification of the ZnWO4 and WO3 nanostructures with the polyaniline (PANI) conducting polymer was done by in situ oxidative polymerization of PANI. Comprehensive analysis of the structural and morphological properties of the nanocomposite revealed high structural integrity and close contact between the individual components. The optical and photo-electrochemical investigations suggested rapid charge carrier separation, suitable band arrangement, and a superior lifetime of the nanocomposite. Afterward, the recyclable ternary nanocomposite demonstrated a higher solar light-mediated photocatalytic degradation of the toxic glyphosate (GLP) herbicide (Kapp = 0.0707 min−1). Additionally, the non-toxic nature of the nanocomposite (after a catalytic cycle) and treated GLP solutions were assessed via the standard TBE (trypan blue dye exclusion) assay. Furthermore, the XPS analysis, radical trapping experiment, and reactive oxygen species quantification (HO· and O2·−) study suggested a possible double electron transfer type Z-scheme mechanism, which accounts for superior solar light-assisted N–C bond cleavage of GLP herbicide.
ISSN:2051-8153
2051-8161
DOI:10.1039/d1en00563d