One-Pot Synthesis of Visible-Light-Driven Plasmonic Photocatalyst Ag/AgCl in Ionic Liquid

Abstract

Plasmonic photocatalyst Ag/AgCl was prepared by in situ hydrothermal method with the contribution of 1-octyl-3-methylimidazolium chloride ([Omim]Cl), in which the [Omim]Cl ionic liquid acted not only as a precursor but also as a reducing reagent in the process of formation of Ag⁰. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), and thermogravimetric and differential scanning calorimetry (TG-DSC). The photocatalytic activity of the composites were evaluated by degradation of methyl orange (MO) under visible light irradiation. The experimental results showed that the high activity and stability of Ag/AgCl photocatalysts under visible-light irradiation were due to their localized surface plasmon resonance (LSPR). Based on the characterization of the structure and photocatalytic performance, the LSPR was determined by synergetic effect of many factors, such as particle size of metallic Ag, contents of the Ag⁰ nanoparticles, and the extent of metallic Ag dispersing. A photocatalytic mechanism of the Ag/AgCl photocatalyst was also proposed.

Novel Synthesis of Plasmonic Ag/AgCl@TiO2 Continues Fibers with Enhanced Broadband Photocatalytic Performance

“…The Cl 0 species oxidize the X-3B molecules and form AgCl. These reactions ensure that Ag/AgCl and S-CTF remain stable during the photodegradation process [16,20,37]. Secondly, the holes generate by TF yield •OH radicals or degrade organic pollutants directly.…”

A review on plasmonic metal⿿TiO2 composite for generation, trapping, storing and dynamic vectorial transfer of photogenerated electrons across the Schottky junction in a photocatalytic system

“…The 4-CP can also be oxidized directly by plasmon induced hole (or Ag + ) on Ag nanoparticles, thereby accelerating the reduction of photooxidized Ag nanoparticles back to their initial state. Therefore, the Ag nanoparticles can be rapidly regenerated and the Ag/AgCl/TiO 2 system remains self stable [196]. Considering their large specific surface area, high pore volume, unique morphology and high photocatalytic activity, these photocatalysts are of great interest in various applications like sensors, solar cell, catalysis, separation technology, biomedical engineering and nanotechnology.…”

Regulations of silver halide nanostructure and composites on photocatalysis

“…As AgX is composited by Ag + and Cl − , common features for synthesis are definitely existed among them, such as a precipitation reaction of Ag + and X − and ion-exchange between silver salt and HX [122][123][124][125][126][127][128][129][130][131][132][133][134][135]. The architecture and morphology of AgX, especially with high-surface-energy crystalline facets, are able to manage and define their unique photocatalytic properties [136][137][138][139][140][141][142][143][144].…”