In Situ Photoactivated Plasmonic Ag3PO4@silver as a Stable Catalyst With Enhanced Photocatalytic Activity Under Visible Light

Abstract

Silver orthophosphate (Ag 3 PO 4 ) had been reported as an excellent candidate to split water or decompose pollutants with high efficiency in visible light region, yet is not stable due to the reduction of silver ion. In this work, an easy-fabricated method (in situ photoinduced reduction) was provided to enhance the stability of Ag 3 PO 4 for its possible application as a visible-light sensitive photocatalyst. The as-prepared samples were characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectra, photoluminescence spectra (PL) and Photoelectrochemical measurements. The Ag 3 PO 4 /Ag photocatalysts showed strong photocatalytic activity for decomposition of RhB dye or phenol-X-3B mixture under visible light irradiation (λ> 420 nm) and can be used repeatedly. The possible mechanism for the enhanced photocatalytic properties of the Ag 3 PO 4 /Ag hybrid was also discussed. It was found that •OH and holes take priority over •O 2 ‾ radicals in serving as the main oxidant in the Ag 3 PO 4 /Ag photocatalytic system. Especially, the experimental results indicate that the surface plasmon resonance of Ag nanoparticles and a large negative charge of PO 4 3-ions as well as high separation efficiency of e--h + pairs, facilitated the enhancement of the photocatalytic activity of the Ag 3 PO 4 /Ag composite. The results indicated that Ag 3 PO 4 /Ag is an efficient and stable visible-light-driven photocatalyst.

Visible light plasmon excitation of silver nanoparticles against antibiotic-resistant Pseudomonas aeruginosa

“…The last one received a special attention in the field of catalysis due to the possibility of electronic or vibrational activation of substrates or reaction intermediates. Interestingly, recent studies have demonstrated the formation of ROS at the surface of metallic nanoparticles (63)(64)(65). For .…”

“…It has been suggested that the formation of ROS by AgNPs occurs either at the particle surface or it is indirectly caused by Ag + ions released from aging nanoparticles (69,70). In addition, the light stimulus may contribute to the amount of ROS generated through a mechanism of plasmon-produced hot electrons and their interaction with water and oxygen dissolved in the medium (63)(64)(65). To assess whether exposure to light affects the production of Ag + from AgNPs by an aging process, a closed dialysis membrane filled with an AgNPs suspension was submerged in distilled water and the concentration of released Ag + to the solution was followed during 24 h (Fig.…”

Visible Light Plasmon Excitation of Silver Nanoparticles Against Antibiotic-Resistant Pseudomonas aeruginosa

“…The last one received a special attention in the field of catalysis due to the possibility of electronic or vibrational activation of substrates or reaction intermediates. Interestingly, recent studies have demonstrated the formation of ROS at the surface of metallic nanoparticles (63–65). For example, LSPR-based antibacterial treatment with gold nanoparticles has been reported (66–68).…”

“…It has been suggested that the formation of ROS by AgNPs occurs either at the particle surface or it is indirectly caused by Ag + ions released from aging nanoparticles (69, 70). In addition, the light stimulus may contribute to the amount of ROS generated through a mechanism of plasmon-produced hot electrons and their interaction with water and oxygen dissolved in the medium (63–65). To assess whether exposure to light affects the production of Ag + from AgNPs by an aging process, a closed dialysis membrane filled with an AgNPs suspension was submerged in distilled water and the concentration of released Ag + to the solution was followed during 24 h (Fig.…”

Antioil Ag3PO4 Nanoparticle/Polydopamine/Al2O3 Sandwich Structure for Complex Wastewater Treatment: Dynamic Catalysis under Natural Light

“…Silver phosphate (Ag 3 PO 4 ) is a particular semiconductor material featuring a typical band gap of ∼2.42 eV, making it promising as a photocatalyst under natural light. , By virtue of its highly dispersive band structure at the conduction band minimum, Ag 3 PO 4 shows higher electron transfer efficiency than many other semiconductor catalysts. − Thus, Ag 3 PO 4 is one of the most efficient photocatalysts currently. − Nevertheless, there are still some problems that need to be overcome in the current situation. For example, the stability of Ag + has troubled people for a long time, as Ag + tends to transform into elemental silver (Ag 0 ), which severely affects the catalytic performance of Ag 3 PO 4 . , In addition, although Ag 3 PO 4 has been used as a popular catalyst, most has been ineligible for natural light catalysis as the light intensity is lower than 500 lx indoor, making Ag 3 PO 4 difficult to be applied to practical water remediation.…”