Regulations of silver halide nanostructure and composites on photocatalysis

Abstract

The silver halides and their corresponding composites would constitute remarkable photocatalytic systems not only in energy production but also in environmental remediation. The major advantage in these silver halides system is that plasma metal Ag 0 species would be spontaneously generated by silver halides under light irradiation, which play dual roles of expanding light absorption range and charge carriers separation. In this tutorial review, the origin and development of silver halides, synthesis methods, construction of composite structures with other materials, photocatalytic applications, and various and controversial mechanisms are all exhaustively described.

Carbon Nanomaterials in Direct Liquid Fuel Cells

“…The combinations of noble metal nanoparticles and carbon nanotubes can hopefully expand the promising applications of fuel cells in portable power generation and portable electronics. Meanwhile, carbon‐based nanocomposites have been employed in photocatalysis,, sensors, solar cells, reinforcement, thermal conduction, lithium ion batteries, adsorbent,, metamaterials, cryogenic materials, insulator, coating, electromagnetics, phototherapy,, and electrical conduction,, functional structural materials,, and energy storage/conversion materials . All these can be studied for future research directions.…”

ZNO-Ag/PS and ZnO/PS Films for Photocatalytic Degradation of Methylene Blue

“…However, the capability of ZnO in photodegradation opposite its poor chemical stability under photocatalytic reaction [11] as it undergoes corrosion by self-oxidation under UV irradiation, leading to the loss of the photocatalytic activity. Thus, it needs to improve the photostability by incorporation into various composites like TiO2 or by deposition of noble metals like Ag on the surface [5,12].…”

“…Efficient photocatalytic degradation of organic pollutants was reported by depositing TiO2 ultrathin layer on Ag-ZnO nanorods, where the addition of Ag work as a sink for electron collector and prevent charges recombination. The TiO2 layer increases the stability of photocatalyst against photo-corrosion under UV irradiation [12]. Several studies have designated that the photocatalytic rate increases with catalyst loading with metal, but at high concentrations of metal load will lose its efficiency, because of light scattering and screening effects happened [13].…”

“…According to this method, incorporation of species that accept electrons at conduction band of the photocatalyst, like transition metal ions or oxides increases the activity in degradation comparing to bare semiconductors. The consuming of a photo-excited hole by photooxidation species are expected could reduce the recombination process and make it highly efficient [5,12,14]. Usually, defect in photocatalyst by doping makes shifting in band gap to less value; therefore, the addition of dopants decrease the band gap causing surface modification by the new site and lifetime charges carriers' recombination is retarded and increase the photocatalyst ability in the photodegradation process [15][16].…”

One-step construction of heterostructured metal-organics@Bi2O3 with improved photoinduced charge transfer and enhanced activity in photocatalytic degradation of sulfamethoxazole under solar light irradiation

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