Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 376, Issue -, Pages 43-53Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2019.03.008
Keywords
Supported catalyst; Polymer microgels; Ag-AgCl composite nanomaterials; Photocatalysis; Degradation of methyl orange (MO)
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Funding
- National Natural Science Foundation of China [21173141]
- Key Industry Project of Shaanxi Province of China [2011K08-14]
- National 111 Project of China [B14041]
- National Science Foundation for Post-doctoral Scientists of China [2018M633453]
- Fundamental Research Funds for the Central Universities of China [GK201803032]
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In this study, Ag nanocatalysts were loaded onto micro-sized soft hydrogel spheres to achieve a high dispersion stability and recyclability. Using poly(N-hydroxymethyl acrylamide) (PNHMA) hydrogel microspheres which contain hydroxyl groups as templates for loading Ag nanoparticles (AgNPs), PNHMA/Ag composites were prepared in situ using ethylene glycol as the reducing agent and solvent. AgNPs were controllably transformed to Ag-AgCl composite particles using CCl4 as the chloride source, from which chloride ions are released slowly in the precipitation reaction. The PNHMA/Ag composites exhibited an unevenly patterned surface morphology resulting from the space-confinement effect of the PNHMA microgels constituting a 3D network structure for AgNPs loading. AgCl particles with irregular polyhedral structures were fabricated on the surface of the PNHMA/Ag composite. The relative amounts of Ag and AgCl in the PNHMA/Ag-AgCl composite could be effectively tuned by varying the CCl4 dosage. The PNHMA/Ag-AgCl composites showed an excellent photocatalytic activity for the degradation of methyl orange (MO).
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