Solid‐State Synthesis of Silver Nanoparticles and Their Catalytic Application in Methylene Blue Reduction

Abstract

The silver nanoparticles (Ag NPs) were successfully synthesized by a facile solid‐state chemical method. Ag NPs were obtained by a mechanochemical reaction between silver nitrate and sodium citrate, with the constant stirring and heating of reactants. The size and morphology characterization of NPs powder was performed by scanning electron microscopy. The obtained NPs were spherical with a 36 nm average particle size diameter. UV‐Vis spectroscopy, dynamic light scattering, and zeta potential measurements were used in order to characterize the surface plasmon band position in colloid dispersion and the NPs charges. Obtained NPs were utilized as a catalyst in the process of methylene blue (MB) reduction in the presence of sodium‐borohydride. Kinetic measurements of uncatalyzed and catalyzed reduction were carried out using the stopped‐flow technique, keeping the concentration of reactant constant. Mechanism of MB reduction in the presence of catalyst Ag NPs is elucidated as a consecutive two first‐order reactions. The results of these studies support the hypothesis that NPs participated in electron transfer.

Squarelike AgCl Nanoparticles Grown Using NiCl2(Pyz)2-Based Metal–Organic Framework Nanosheet Templates for Antibacterial Applications

“…The process is as follows: AgCl + 2H 2 O + O 2 ⃗ AgCl + 4OH·(under light conditions). The hydroxyl radicals produced can degrade the organic matter and kill environmental microorganisms. , They have a wide application prospect in water pollution treatment and as antibacterial agents. , Different morphologies of silver chloride have different absorption coefficients of light and the efficiency of producing hydroxyl radicals is also discrepant; thus, the germicidal efficacy will be distinct. , In the simple ionic aqueous solution of silver nitrate and sodium chloride, the size of AgCl prepared is large and not uniform due to the fast precipitation rates of Ag + and Cl – . The traditional preparation methods of nanoparticles are chemical reduction and some other technologies, including ultraviolet radiation, aerosol method, photolithography, laser ablation, and photochemical reduction, ,− which are complex and may lead to the formation of nanoparticles with various morphologies.…”

“…29,30 They have a wide application prospect in water pollution treatment and as antibacterial agents. 31,32 Different morphologies of silver chloride have different absorption coefficients of light and the efficiency of producing hydroxyl radicals is also discrepant; thus, the germicidal efficacy will be distinct. 33,34 In the simple ionic aqueous solution of silver nitrate and sodium chloride, the size of AgCl prepared is large and not uniform due to the fast precipitation rates of Ag + and Cl − .…”

Sensitive Detection of Perfluoroalkyl Substances Using MXene–AgNP-Based Electrochemical Sensors

“…The Ag ion reduction in the MXene (Ti 3 C 2 (OH) 0.8 F 1.2 ) solution is associated with the presence of low-valence Ti (Ti−OH) that can act as a reducing agent for the silver ions, 35,37 and 450 nm depending on the NP size and shape. 39 We thus used UV−vis spectroscopy to further confirm the presence of the AgNPs. A broad absorption peak between 400 and 500 nm appeared in the solid-state UV−vis spectra (Figure 2D), with the peak intensity increasing with the increase of Ag content from 10 to 40%, which indicates the presence of polydisperse AgNPs.…”

“…Additionally, no shift in the MXene 002 peak position at 9° was observed which suggests no intercalation of AgNPs inside the MXene layers. It is known that AgNPs possess a strong surface plasmon resonance, with characteristic absorption peaks between 400 and 450 nm depending on the NP size and shape . We thus used UV–vis spectroscopy to further confirm the presence of the AgNPs.…”

Solid‐State Synthesis of Liquorice‐Stabilized Copper‐Based Nanoparticles: Structural and Catalytic Studies

“…The nanomaterials prepared using the solid‐state reaction are characterized by their low cost, dispensing with washing and separation steps, low energy consumption, low harmful emissions, mass production, high stability, ease of preparation and transportation. Regarding these advantages, many researchers have worked on developing solid‐state reaction methods to prepare various nanomaterials such as Cu and Cu 3 Au, [17] Ag, [18] VO 2 , [19] CdO, [20] Ag@plypyrrole, [21] Au@Ag core@shell, [22] ZnO, [23] and Ag‐Cu 2 O/graphene oxide [24] . However, these solid‐state preparation routes include the use of hazardous reducing agents such as sodium borohydride, hydrazine hydrate, ethylene glycol, etc., and the use of expensive reagents [25] .…”