Journal
ACS APPLIED NANO MATERIALS
Volume 6, Issue 19, Pages 17406-17422Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.3c02192
Keywords
antibacterial; antibiotics degradation; LDHnanosheets; nanocomposite; photocatalyst
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This study presents the development of a solid-state mediator Ag-0-based-Z-scheme LDH/PANI/MAA/Ag heterojunction nanocomposite with intimate morphological contact interface. The synthesized nanocomposite showed enhanced photocatalytic degradation of emerging pollutants under sunlight irradiation and exhibited a large specific surface area and an excellent interface between its components. Additionally, the nanocomposite demonstrated antibacterial potential against Gram-positive and Gram-negative bacteria.
The present work discusses on the development of a solid-state mediator Ag-0-based-Z-scheme LDH/PANI/MAA/Ag heterojunction nanocomposite with an intimate morphological contact interface through an electrostatic self-assembly strategy. Here, an Ag-0-decorated layered double hydroxide (LDH) nanosheet-based polymeric nanocomposite has been synthesized by ultrasonic treatment of NiFe LDH with aniline followed by in situ polymerization-stabilization and adsorption-reduction of Ag+ ions at low temperatures. In this synthesis, a mercaptoacetic acid (MAA)-functionalized polyaniline (PANI) promotes the exfoliation of NiFe LDH and stabilizes the nanosheets (LDH) followed by successful adsorption-reduction of Ag+ ions by its chelating groups to Ag-0. The synthesized ternary photocatalyst displayed an enhanced photocatalytic degradation of emerging pollutants (Ciprofloxacin: 97.4%, Reactive Blue 4: 97.7%, and Safranin: 93.1% of degradation) under sunlight irradiation within 80 min. The enhanced photocatalytic performance of the LDH/PANI/MAA/Ag nanocomposite indicates a synergistic effect on electron transfer over components, which is systematically identified by the delayed electron-hole recombination as supported by photoluminescence and electrochemical impedance spectroscopy measurements as well as photostability of the material supported by the chronoamperometry analysis. The synthesized LDH/PANI/MAA/Ag nanocomposite possesses a large specific surface area and an excellent interface between LDH nanosheets, PANI/MAA, and Ag-0, which has been confirmed from the N-2 sorption isotherm, transmission electron microscopy, and high-resolution transmission electron microscopy studies. In addition, the antibacterial potential against Bacillus pumilus (Gram-positive) and Escherichia coli (Gram-negative) bacteria authenticates further advancement of the LDH/PANI/MAA/Ag nanocomposite as a potent material composition.
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