A further insight into the mechanism of Ag+ biosorption by Lactobacillus sp. strain A09

Lin, Ziyu; Zhou, Chaohui; Wu, Jiming; Zhou, Jian-Zhang; Wang, Lin

doi:10.1016/j.saa.2004.06.041

Cited by 70 publications

(44 citation statements)

References 19 publications

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“…In addition, it is possible that Ag + could have also been reduced by residual Fe 2+ in both experimental systems (Reaction (5)). Increased metal concentrations are known to cause cell lyses thereby releasing intracellular material that could act as additional reductants that contribute to the formation of Ag (and Au) nanoparticles (Reaction (6)) [58][59][60]. In the natural environment, however, Ag nanoparticles would likely be unstable for prolonged periods of time as they would also be subjected to dissolution processes [61][62][63][64].…”

Section: Microbially-catalyzed Ag Immobilizationmentioning

confidence: 99%

Biogeochemical Cycling of Silver in Acidic, Weathering Environments

et al. 2017

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Under acidic, weathering conditions, silver (Ag) is considered to be highly mobile and can be dispersed within near-surface environments. In this study, a range of regolith materials were sampled from three abandoned open pit mines located in the Iberian Pyrite Belt, Spain. Samples were analyzed for Ag mineralogy, content, and distribution using micro-analytical techniques and high-resolution electron microscopy. While Ag concentrations were variable within these materials, elevated Ag concentrations occurred in gossans. The detection of Ag within younger regolith materials, i.e., terrace iron formations and mine soils, indicated that Ag cycling was a continuous process. Microbial microfossils were observed within crevices of gossan and their presence highlights the preservation of mineralized cells and the potential for biogeochemical processes contributing to metal mobility in the rock record. An acidophilic, iron-oxidizing microbial consortium was enriched from terrace iron formations. When the microbial consortium was exposed to dissolved Ag, more than 90% of Ag precipitated out of solution as argentojarosite. In terms of biogeochemical Ag cycling, this demonstrates that Ag re-precipitation processes may occur rapidly in comparison to Ag dissolution processes. The kinetics of Ag mobility was estimated for each type of regolith material. Gossans represented 0.6-146.7 years of biogeochemical Ag cycling while terrace iron formation and mine soils represented 1.9-42.7 years and 0.7-1.6 years of Ag biogeochemical cycling, respectively. Biogeochemical processes were interpreted from the chemical and structural characterization of regolith material and demonstrated that Ag can be highly dispersed throughout an acidic, weathering environment.

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Section: Microbially-catalyzed Ag Immobilizationmentioning

confidence: 99%

Biogeochemical Cycling of Silver in Acidic, Weathering Environments

et al. 2017

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“…Biosorption and bioreduction of Ag° on cell surface was also reported in Lactobacillus sps. A09 at 30° C, pH 4.5 in 24 h [20].…”

Section: Characterization Of Silver Nanoparticlesmentioning

confidence: 99%

Screening of Lactobacillus spp, for mediating the biosynthesis of silver nanoparticles from silver nitrate.

Ranganath¹,

Rathod²,

Banu³

2012

iosrphr

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In modern nano science and technology the interaction between inorganic nanoparticles and biological structures are the most exciting areas of research. The desire to synthesize nanoparticles, using efficient and green chemistry approaches has led to the use of microorganisms. Hence the present study reports on the screening of potent Lactobacillus spp for ecofriendly and economical synthesis of silver nanoparticles. Total of nine Lactobacillus strains were isolated from milk and milk products inoculated to sterilized milk and latter (after 24hr) the whey was collected by coarse filtration (Whatman no.40). Silver nitrate (1 mg) was added to 5 ml of pale yellow filtrate then incubated at 37⁰C. Absorption maximum was measured using spectrophotometer. The silver nanoparticles of size ranging from 2 to 20nm were synthesized by Lactobacillus sp VRS-2 which was confirmed by TEM and EDS analysis. Thus, rapid and ecofriendly biosynthesis of silver nanoparticles using whey appears to be economical approach and any research in this direction is encouraging.

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“…[38][39][40]. The intensity variation and shifting the band from 3331 to 3356, 1637 to 1651, and 1068 to 1035 cm À1 verify that two functional groups, both carboxyl and either amine or hydroxyl (phenolic) are involved in metal binding [14,19,20,[38][39][40]. The study of XRD spectra of pristine …”

Section: Biosorbent Characterization By Ft-ir Xrd and Elemental Anamentioning

confidence: 70%

“…In this study, FT-IR spectra and potentiometric investigations of Cercis siliquastrum tree leaf show that it contains some functional groups, so metal ions could be bound to these groups (especially carboxylic group) through ion-exchange, which may be followed by a complexation reaction [38,39,55]. In order to determine precisely the contribution of ion-exchange mechanism on Ag(I) biosorption process, releasing of alkali (K þ and Na þ ) and alkaline earth metal ions (Ca 2þ and Mg 2þ ) present in the Cercis siliquastrum tree leaves and also proton binding (H þ ) during sorption were measured.…”

Section: Effect Of Alkaline and Alkaline Earth Metal Ionsmentioning

confidence: 81%

“…The plant cell walls mainly consist of polysaccharides, proteins, and lipids. These constituents also offer many functional groups such as carboxyl, carbonyl, hydroxyl, and amino, which can be involved in the metal binding process [8,[37][38][39]. Hence, the following investigations are presented for recognition of binding mechanism of Ag(I) and Cercis siliquastrum.…”

Section: Resultsmentioning

confidence: 99%

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Cercis siliquastrum Tree Leaves as an Efficient Adsorbent for Removal of Ag(I): Response Surface Optimization and Characterization of Biosorption

Zolgharnein

Shariatmanesh

Asanjarani

2013

CLEAN Soil Air Water

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The Cercis siliquastrum tree leaves are introduced as a low cost biosorbent for removal of Ag(I) from aqueous solution in a batch system. FT-IR, XRD analysis, and potentiometric titration illustrate that the adsorption took place and the acidic functional group (carboxyl) of the sorbent was involved in the biosorption process. In addition, it was observed that the pH beyond pH pzc 4.4 is favorable for the removal procedure. The effect of operating variables such as initial pH, temperature, initial metal ion concentration, and sorbent mass on the Ag(I) biosorption was analyzed using response surface methodology (RSM). The proposed quadratic model resulting from the central composite design approach (CCD) fitted very well to the experimental data. The optimum condition obtained with RSM was an initial concentration of Ag(I) of 85 mg L À1 , pH ¼ 6.3 and sorbent mass 0.19 g. The applicability of different kinetic and isotherm models for current biosorption process was evaluated. The isotherm, kinetic, and thermodynamic studies showed the details of sorbate-sorbent behavior. The competitive effect of alkaline and alkaline earth metal ions during the loading of Ag(I) was also considered.

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A further insight into the mechanism of Ag+ biosorption by Lactobacillus sp. strain A09

Cited by 70 publications

References 19 publications

Biogeochemical Cycling of Silver in Acidic, Weathering Environments

Biogeochemical Cycling of Silver in Acidic, Weathering Environments

Screening of Lactobacillus spp, for mediating the biosynthesis of silver nanoparticles from silver nitrate.

Cercis siliquastrum Tree Leaves as an Efficient Adsorbent for Removal of Ag(I): Response Surface Optimization and Characterization of Biosorption

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