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

Autor: Pritam Biswas, Rajdip Bandyopadhyaya
Jazyk: angličtina
Rok vydání: 2018
Předmět:
MECHANISM
Silver
Environmental Engineering
Materials science
Activated carbon
Metal Nanoparticles
Nanoparticle
Nanotechnology
02 engineering and technology
010501 environmental sciences
engineering.material
Citrate coating
01 natural sciences
Citric Acid
Silver nanoparticle
Water Purification
chemistry.chemical_compound
Adsorption
Coating
medicine
Escherichia coli
Environmental Chemistry
Particle Size
0105 earth and related environmental sciences
General Environmental Science
Coating density
STABILITY
General Medicine
021001 nanoscience & nanotechnology
Water disinfection
Anti-Bacterial Agents
Disinfection
chemistry
ESCHERICHIA-COLI
Charcoal
BACTERIA
engineering
Particle size
Silver nanoparticles
0210 nano-technology
Citric acid
Antibacterial activity
Disinfectants
Nuclear chemistry
medicine.drug
Zdroj: IndraStra Global.
ISSN: 2381-3652
Popis: 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 46.17 molecules/nm(2), 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 0.82 wt.%, respectively. On passing contaminated water (containing 10(4) 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 duration. TGA-DSC shows that Ag-NPs with a low coating density bind to AC with 4.55 times higher adsorption energy, compared to Ag/AC with a high coating density, implying stronger binding. Therefore, coating density is an important parameter for achieving higher antibacterial efficacy, translating into a faster decontamination rate in experiments, over a long period of flow-column operation. (C) 2017 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
Databáze: OpenAIRE
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