Microwave-assisted synthesis of silver nanoparticles and their application in catalytic, antibacterial and antioxidant activities

Abstract

Eco-friendly silver nanoparticles (AgNPs) were synthesized using a carboxymethylated gum kondagogu (CMGK) as capping and reducing agent by microwave irradiation method. Synthesized AgNPs were analyzed by TEM, showed spherical in shape with an average particle size distribution of 9 ± 2 nm. XRD results showed that the cubic-structured AgNPs with crystallite size of 8.6 nm. The synthesized CMGK capped AgNPs was tested for catalytic activity using hexacyanoferrate(III) in the presence of NaBH 4 and the impacts of catalyst dose and temperature were examined. The synthesized AgNPs demonstrated a huge antibacterial action on both Gram-positive and negative groups of microorganisms with inhibition zone of 23, 25 and 28 mm, respectively, for Bacillus subtilis, Bacillus cereus and Escherichia coli, they showed moderate antibacterial action (zone of inhibition 15 mm) with Pseudomonas aeruginosa. In addition, the ability of the AgNPs scavenging activity with different concentrations was studied using the DPPH radical scavenging.

Microwave-assisted preparation of a silver nanoparticles/N-doped carbon dots nanocomposite and its application for catalytic reduction of rhodamine B, methyl red and 4-nitrophenol dyes

“…2b; shows that gradual increase in the microwave irradiation time up to 120 s, increased the amount of AgNPs/NCDs nanocomposite formation. 13,23,43 Under these conditions, the yield of the nanocomposite was found to be 5.8%. Besides, Fig.…”

“…04-0783). 23,28 XRD investigation suggested that the synthesized AgNPs/NCDs nanocomposite was composed of crystalline silver.…”

“…[15][16][17][18][19][20] Among them, mainly silver nanoparticles (AgNPs) have attracted considerable attention because of their high electrical conductivity, cost-effectiveness and antimicrobial activity as well as showing high catalytic efficacy in various chemical reactions such as alkane and alkene oxidation, reduction of dyes, hydrogenation of 4-NP and as intermediates in pharmaceutical reactions. [21][22][23][24][25] A broad series of methods like chemical, physical, laser ablation, hydrothermal, sol-gel, ultrasonication, microwave irradiation and electrochemical have been developed to obtain AgNPs, and additional signicant efforts have been dedicated to controlling their shape as well as size that can signicantly inuence the features of AgNPs. 23,[26][27][28] Among all the synthetic strategies, chemical pathways can govern both the shape and size of the AgNPs, but most of the chemical methods are depending on the reduction of AgNO 3 with a strong reducing agent like hydrazine hydrate, sodium citrate and sodium borohydride.…”

“…[21][22][23][24][25] A broad series of methods like chemical, physical, laser ablation, hydrothermal, sol-gel, ultrasonication, microwave irradiation and electrochemical have been developed to obtain AgNPs, and additional signicant efforts have been dedicated to controlling their shape as well as size that can signicantly inuence the features of AgNPs. 23,[26][27][28] Among all the synthetic strategies, chemical pathways can govern both the shape and size of the AgNPs, but most of the chemical methods are depending on the reduction of AgNO 3 with a strong reducing agent like hydrazine hydrate, sodium citrate and sodium borohydride. 29,30 These reagents are exceedingly toxic, sensitive and have biological risks.…”

Continuous synthesis of photocatalytic nanoparticles of pure ZnO and ZnO modified with metal nanoparticles

“…Among the well-known and commonly used metal nanoparticles, the main representatives are silver and copper. The Ag and Cu nanoparticles show a number of desirable properties, including high antimicrobial activity, catalytic and optical properties [20]. By modifying the zinc oxide surface, the addition of Ag or Cu significantly improves the photocatalytic properties.…”