Photocatalytic Performance of Ag and CuBiS₂ Nanoparticle-Coated SiO₂@TiO₂ Composite Sphere under Visible and Ultraviolet Light Irradiation for Azo Dye Degradation with the Assistance of Numerous Nano p–n Diodes

Abstract

Ag and CuBiS 2 nanoparticle-coated SiO 2 sphere@nano TiO 2 coating (SiO 2 @TiO 2 ) composite catalyst (abbreviated as SiO 2 /TiO 2 /CuBiS 2 /Ag) has been successfully synthesized and characterized as well as tested for photocatalysis of Acid Black 1 (AB 1) dye under visible and ultraviolet (UV) light irradiation. These as-prepared composite spheres show photocatalytic activities under visible and ultraviolet light irradiation. This work is the first report of CuBiS 2 semiconductor nanoparticles used as a material for photodegradation. The data showed that the SiO 2 /TiO 2 /CuBiS 2 /Ag composite particles completely degraded 50 mL of 10 ppm AB 1 dye solution in only 5 min under UV light irradiation and 100 mL of 5 ppm AB 1 dye solution in 30 min under visible light irradiation. The good photocatalysis of our composite spheres is attributed to the establishment of a good p−n heterojunction interface between the p-type CuBiS 2 and n-type TiO 2 semiconductors with the assistance of Ag nanoparticles.

Compound Copper Chalcogenide Nanocrystals

“…In this direction, several architectures have been tested, including CuS QDs supported on TiO 2 nanotubes, Cu x S/TiO 2 nanocomposites, CuS-TiO 2 nanofibers, CZTS-TiO 2 composites, CIS-TiO 2 nanotube arrays, CISe-TiO 2 nanotube arrays, , and CuS/ZnO heterostructured nanowire arrays; , Cu 2 S@ZnO heterostructures, , and nanocomposites; composites formed by RGO, CIS, and TiO 2 , and RGO-CIS-ZnO nanocomposites; and CuS-WO 3 composites . In addition, semiconductor−metal nanostructures, such as Cu 2 S-Au or CZTS-Au heterostructures, or semiconductor−semiconductor−metal nanostructures, such as Ag-CuBiS 2 -TiO 2 composites, have been produced and tested for the degradation of dyes and other pollutants.…”

Phase‐Controlled Synthesis of High‐Bi‐Ratio Ternary Sulfide Nanocrystals of Cu1.57Bi4.57S8 and Cu2.93Bi4.89S9

“…Bismuth‐based sulfide materials have received lots of attention due to the abundant structure, composition with tunable electronic states, which show promising applications in photovoltaic solar absorber,, electron acceptor, high external quantum efficiency photoconductive response material, photocatalysis for azo dye degradation,, solution‐processed solar cells applications, sensitizer for quantum dot solar cells, cancer diagnosis, photothermal theragnosis synergistic therapy, and bioimaging and especially thermoelectric materials . The nature of Bi 2 S 3 is attributed to a n‐type semiconductor with excellent thermoelectric property ,.…”

Convenient pH-responsive removal of Acid Black 1 by green l-histidine/iron oxide magnetic nanoadsorbent from water: performance and mechanistic studies

“…Additionally, no destruction in the UV-visible spectrum of AB1 (except reduction of band intensity) upon addition of His-MNPs also suggests the adsorption mechanism and absence of AB1 degradation. This viewpoint is justied by the study of Abdullah and Kou (2015), 50 and Mohammadi et al (2016); 51 they observed signicant destruction in the UV-visible spectrum of AB1 due to its photocatalytic degradation. The adsorption of AB1 was also conrmed when used His-MNPs released AB1 color in tested eluents (aq.…”