Ag@AgCl Photocatalyst Loaded on the 3D Graphene/PANI Hydrogel for the Enhanced Adsorption‐Photocatalytic Degradation and In Situ SERS Monitoring Properties

Abstract

Here, 3D GH/PANI/Ag@AgCl composites were successfully synthesized by binding Ag + ions with the Cl À ions of HCldoped PANI in 3D GH/PANI and the subsequent photo-assisted reduction. Compared with 3D GH/PANI, Ag@AgCl and GO/ PANI/Ag@AgCl catalysts, the synergistic effects of porous GH network structure, conductive 1D PANI, and the localized surface plasmon resonance of Ag@AgCl, enabled 3D GH/PANI/ Ag@AgCl superior adsorption-photocatalytic degradation performance of RhB under visible-light irradiation. PL spectra and a serious of photoelectrochemical measurements were em-ployed to investigate the reasons for such enhanced photocatalytic activity. Combined with the active species trapping experiments, the possible improved photocatalytic degradation mechanism was proposed. With the prepared 3D GH/PANI/ Ag@AgCl photocatalyst itself as the substrate, real-time SERS detection of the presence of RhB and its degradation process can also be achieved. Besides these important results, easy separation and good regeneration property of 3D GH/PANI/ Ag@AgCl further make it a promising application in water purification.Recently, due to the photosensitive semiconductor characteristic of silver halide AgX (X = Cl, Br, I) and its synergistic effect with the surface plasmon resonance (SPR) of metallic Ag, the heterojunction of AgX and Ag (Ag@AgX) can exhibit high stability and highly efficient for visible light utilization. [4][5][6] Thus it has attracted considerable attention in photocatalysis processes. However, the electron-hole pairs induced by plasmon would recombine in a rapid rate during the process of transferring to the surface of Ag@AgX photocatalyst. [7][8][9] According to those pioneering researches, several strategies could be adopted to preparing multicomponent photocatalytic composites to retard the photoelectron-hole recombination, such as metal ion deposition, [10] formation of heterojunctions [11][12][13] or combination with conductive nonmetallic materials. [14,15] The inconvenience in terms of the separation and manipulation of Ag@AgX photocatalyst from the wastewater is another important factor to prevent its use. Technical limitations to recycle them not only increase the cost, but also possibly cause secondary pollution. The general strategy to solve this problem is to explore a suitable matrix to immobilize catalyst powders. [16] For all these reasons, Ag@AgXbased composite materials, such as fibrous Ag@AgCl composites, [17] rGO

A scalable route to quaternary ammonium-functionalized AgCl colloidal antimicrobials inhibiting food pathogenic bacteria and biofilms

“…The binding energy (BE) position of Ag3d 5/2 centered at 367.1 ± 0.3 eV and 367.5 ± 0.2 eV ( Fig. S2 ) for AgCl/DDAC and AgCl/DDoAC respectively, are compatible with the existence of AgCl in both systems [ 60 , 61 ]. However, the limited chemical shift typically observed on silver photoelectron signal induced us to confirm attribution to AgCl by recording and processing AgMNN Auger signals ( Fig.…”

Cu-Loaded Polyaniline-Coated MoO3 Nanowire Nanohybrids for High-Sensitivity NH3 Sensing at Room Temperature

“…The signals at 1139.85 and 815.83 cm –1 are identified as the stretching vibrations of the in-plane and out-plane C–H bonds, respectively . In addition, the band at 593.57 cm –1 corresponds to the N–Cl bending vibration. , Compared with the spectra of pure PANI, the structure of the PMN-20 and Cu-3-PMN-20 hybrids doped by MoO 3 nanowires and nano Cu is changed. Specifically, the stretching vibration of C–N and N–Cl bonds is enhanced, indicating that the protonation degree of the PMN-20 complex is increased.…”

Silver Halide-Based Nanomaterials in Biomedical Applications and Biosensing Diagnostics

“…In 2021, Chen’s group reported a new nanomaterial, Ag@AgCl photocatalyst loaded on 3D graphene/PANI hydrogels that can be used for in situ SERS monitoring [ 139 ]. With silver halides AgX (X = Cl, Br, I) and the surface plasmon resonance (SPR) of metallic Ag, heterojunctions of Ag@AgX can exhibit high stability and highly efficient utilization of visible light.…”