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Antimicrobial activity of thin metallic silver flakes, waste products of a manufacturing process

Journal of Environmental Sciences 2011年第9期23卷 1570-1577页

作者： Manuela Anzano Alessandra Tosti Marina Lasagni Alfredo Campiglio Demetrio Pitea Elena Collina Department of Environmental Sciences University of Milano-Bicocca

The aim of the research was to develop new products and processes from a manufacturing waste from an Italian metallurgic *** company produced thin silver metallic films and the production scraps were silver *** possibility to use the silver flakes in water disinfection processes was *** antimicrobial activity of the flakes was investigated in batch using Escherichia coli as Gram-negative microorganism *** flakes did not show any antimicrobial activity,so they were activated with two different processes： thermal activation in reducing atmosphere and chemical activation,obtaining,respectively,reduced flakes （RF） and chemical flakes （CF）.The flakes,activated with either treatment,showed antimicrobial activity against *** kill rate was dependent on the type of activated *** chemical flakes were more efficient than reduced *** kill rate determined for 1 g of CF,1.0 ± 0.2 min ？1 ,was greater than the kill rate determined for 1 g of RF,0.069 ± 0.004 min ？1 .This was confirmed also by the minimum inhibitory concentration *** was demonstrated that the antimicrobial capability was dependent on flakes amount and on the type of aqueous ***,the flakes maintained their properties also when used a second ***,the antimicrobial activities of flakes were tested in an effluent of a wastewater treatment plant where a variety of heterotrophic bacteria were present.

关键词： metallic silver antimicrobial activity Escherichia coli activation reducing atmosphere waste recovery

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In situ thermal-induced generation of{Ag^(0)Ag^(Ⅰ)}dimer within Co-Ag phosphonates

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Chinese Chemical Letters 2022年第6期33卷 3259-3262页

作者： Qingqing Guo Nanzhu Li Qian Zou Jiage Jia Yifan Wei Songsong Bao Limin Zheng State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical EngineeringCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China

The thermal decomposition of Ag NO_(3)is known to produce metallic Ag,but single-atomic dispersion is hard to achieve instead of the aggregation state of ***,we develop an efficient approach to thermally generate and stabilize single Ag atoms via the coordination *** desired Co-Ag phosphonates[Ag_(2)^(Ⅰ)Co_(2)^(Ⅲ)(notp H_(3))_2(NO_(3))]X[X=NO_(3)^(-)(1)or Cl O_(4)^(-)(2)]were synthesized by solid-phase grinding method or solution *** crystal structures reveal slightly different packing arrangements of various lattice anions and identical one-dimensional(1-D)coordination chains,formed in each case by the coordination of Ag(Ⅰ)to the metalloligand Co(notp H_(3))and NO_(3)^(-) *** number of Ag(Ⅰ)ions connected to each NO_(3)^(-) anion reduces from 5 in bulk Ag NO_(3) to 2 in compounds 1 and 2,leading to the Ag NO_(3)component stepwise decomposition at a lower temperature(<300℃).During the thermal decomposition,the changes of supermolecular structures and Ag oxidation states were monitored by PXRD,IR and XAFS *** most interesting finding is that 1 and 2 can retain chain structures and harvest Ag(0)atoms in the chain by controlling decomposition temperatures(220℃for 1 and 254℃for 2).

关键词： metallic silver Thermal decomposition Metal phosphonate Atomic dispersion Magnetism

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