Impact of density of coating agent on antibacterial activity of silver nanoparticle impregnated plasma treated activated carbon

Journal of Environmental Sciences (China)
Pritam Biswas, Rajdip Bandyopadhyaya

Abstract

To use stabilized nanoparticles (NPs) in water as disinfectants over a very long period, the amount of coating agent (for NP stabilization) needs to be optimized. To this end, silver nanoparticles (Ag-NPs) with two different coating densities of tri-sodium citrate (12.05 and 46.17molecules/nm2, respectively), yet of very similar particle size (29 and 27 nm, respectively) were synthesized. Both sets of citrate capped NPs were then separately impregnated on plasma treated activated carbon (AC), with similar Ag loading of 0.8 and 0.82wt.%, respectively. On passing contaminated water (containing 104 CFU Escherichia coli/mL of water) through a continuous flow-column packed with Ag/AC, zero cell concentration was achieved in 22 and 39 min, with Ag-NPs (impregnated on AC, named as Ag/AC) having lower and higher coating density, respectively. Therefore, even on ensuring similar Ag-NP size and loading, there is a significant difference in antibacterial performance based on citrate coating density in Ag/AC. This is observed in lower coating density case, due to both: (i) higher Ag+ ion release from Ag-NP and (ii) stronger binding of individual Ag-NPs on AC. The latter ensures that, Ag-NP does not detach from the AC surface for a long dur...Continue Reading

Citations

Jan 8, 2020·Nanoscale·Thomas LécuyerCyrille Richard
Jul 16, 2019·The Journal of International Medical Research·He-Ming HuangChang-Jin Shi

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