Visible-light-mediated synergistic photocatalytic antimicrobial effects and mechanism of Ag-nanoparticles@chitosan–TiO2 organic–inorganic composites for water disinfection

Fabrication of TiO2/MoS2@zeolite photocatalyst and its photocatalytic activity for degradation of methyl orange under visible light

“…Titanium oxide (TiO 2 )-based nanomaterials are generally considered to be the most reliable photocatalytic materials for the decomposition of toxic and hazardous organic pollutants. However, TiO 2 can absorb only a small portion of the solar spectrum in the ultraviolet region because of the wide band gap energy (TiO 2 , 3.2 eV), and meanwhile, the fast recombination of the photogenerated electron/hole (e − /h + ) reduces the photonic efficiency and represents the major drawback of photocatalytic applications [1][2][3][4]. So, a single-component Abbreviations: MO, methyl orange; MoS2, molybdenum dichalcogenides; TiO2, titanium dioxide; XRD, X-ray diffraction; FTIR, Fourier transform infrared spectroscopy; SEM, scanning electron microscope; TEM, transmission electron microscope; PL, photoluminescence; UV-vis, ultraviolet visible.…”

A review of solar and visible light active TiO2 photocatalysis for treating bacteria, cyanotoxins and contaminants of emerging concern

“…In more recent years, efforts to combine Ag with other materials as composites for use in areas such as water disinfection and self-cleaning cotton textiles have been studied [82][83][84]. One such material is that of Ag/AgCl [82], which exhibited much higher reactivity under visible light due to the surface plasmon resonance of the Ag-NPs and the production of Cl through oxidation of Cl ions by the holes which are themselves reactive radical species capable of oxidising organic pollutants.…”

Photo-reduction of heavy metal ions and photo-disinfection of pathogenic bacteria under simulated solar light using photosensitized TiO2 nanofibers

“…At higher pH (>6.0), the surfaces of the NFs become negatively charged which tend to repel the anionic species and consequently decreases the photo-reduction kinetics. Moreover, the reduced Cr(III) is deposited on the surface of the NFs as Cr(OH) 3 at pH above 5, which is also responsible for the decreased photo-reduction efficiency.…”

“…which may be fatal. 3 There are several disinfectants used commonly for the effective control of pathogens in drinking water such as free chlorine, chloramines and ozone, etc. However, these usually result in the formation of the harmful disinfection by-products (DBPs), many of which are carcinogenic.…”