Journal ArticleDOI
Biorecovery of gold using cyanobacteria and an eukaryotic alga with special reference to nanogold formation – a novel phenomenon
TLDR
Pro- and eukaryotic algal genera, i.e. Lyngbya majuscula, Spirulina subsalsa, and Rhizoclonium hieroglyphicum were used for bio-recovery of gold out of aqueous solution indicating quick metabolic independent binding of Au to the algae followed by active accumulation and subsequent reduction.Abstract:
Pro- and eukaryotic algal genera, i.e. Lyngbya majuscula, Spirulina subsalsa (Cyanophyceae) and Rhizoclonium hieroglyphicum (Chlorophyceae), were used for bio-recovery of gold (Au) out of aqueous solution. Au (III) spiked with 198Au was used for the experiment. Batch laboratory experiments indicated quick metabolic independent binding of Au to the algae followed by active accumulation and subsequent reduction. Gold accumulation by different algal genera was found in order of R. hieroglyphicum > L. majuscula > S. subsalsa (3.28, 1.93 and 1.73 mg g-1, respectively). It was observed that the algal biomass and the media used for the experiment turned purple in colour indicating reduction of Au (III) to Au (0) at intra- and extracellular level. This was confirmed by TEM studies of L. majuscula biomass exposed in HAuCl4 solution where <20-nm-sized gold particles were found both inside as well as on the surface of the cell. Up to 90–100% of accumulated gold was recovered from the algal biomass by using nitric acid and acidic thiourea solution.read more
Citations
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Synthesis of silver nanoparticles: chemical, physical and biological methods.
TL;DR: An overview of silver nanoparticle preparation by physical, chemical, and biological synthesis is presented to reflect on the current state and future prospects, especially the potentials and limitations of the above mentioned techniques for industries.
Journal ArticleDOI
Applications of biosynthesized metallic nanoparticles - a review.
Adam Schröfel,Adam Schröfel,Adam Schröfel,Gabriela Kratošová,Ivo Šafařík,Mirka Šafaříková,Ivan Raška,Leslie M. Shor +7 more
TL;DR: The key applications reviewed here include biomedical applications, especially antimicrobial applications, but also imaging applications, catalytic applications such as reduction of environmental contaminants, and electrochemical applications including sensing.
Journal ArticleDOI
Biological synthesis of metallic nanoparticles: plants, animals and microbial aspects
Ratul Kumar Das,Ratul Kumar Das,Vinayak Laxman Pachapur,Linson Lonappan,Mitra Naghdi,Rama Pulicharla,Sampa Maiti,Maximiliano Cledón,Maximiliano Cledón,Larios Martinez Araceli Dalila,Saurabh Jyoti Sarma,Satinder Kaur Brar +11 more
TL;DR: This review encompasses the recent advances in the GS of MNPs using plants, animals and microorganisms and analyzes the key points and further discusses the pros and cons of GS in respect of chemical synthesis.
Journal ArticleDOI
Production of nanoparticles using organisms
TL;DR: This review examines the biological mechanism and enzymatic process of nanoparticle production of biological systems used in nanoparticle synthesis.
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Algae-based metallic nanoparticles: Synthesis, characterization and applications.
TL;DR: The present paper reviews the information available on algae-mediated biosynthesis of various NPs, their characterization and applications in different domains and concludes that algae are an appealing platform for the production of diverse NMs.
References
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Journal ArticleDOI
Morphology of gold nanoparticles synthesized by filamentous cyanobacteria from gold(I)-thiosulfate and gold(III)-chloride complexes
TL;DR: The interaction of cyanob bacteria with aqueous Au(S(2)O(3))(2)(3)(-) promoted the precipitation of cubic (100) gold nanoparticles at membrane vesicles and admixed with gold sulfide within cells and encrusted on the cyanobacteria, whereas reaction with AuCl(4)(-) resulted in the precipitationof octahedral (111) gold platelets in solutions and nanoparticles of gold within bacterial cells.
Journal ArticleDOI
Electronic and Optical Properties of Chemically Modified Metal Nanoparticles and Molecularly Bridged Nanoparticle Arrays
Wyatt P. McConnell,James P. Novak,Louis C. Brousseau,Ryan R. Fuierer,and Robert C. Tenent,Daniel L. Feldheim +5 more
TL;DR: In this article, the authors have shown that single electron tunneling energies can be manipulated predictably via pH-induced charge changes of surface-bound thiol capping ligands, and that rigid phenylacetylene molecules are useful bridges for assembling gold and silver nanoparticles into arrays of two, t...
Journal ArticleDOI
Mechanisms of Gold Bioaccumulation by Filamentous Cyanobacteria from Gold(III)−Chloride Complex
TL;DR: The XAS results confirm that the reduction mechanism of gold(III)-chloride to metallic gold by cyanobacteria involves the formation of an intermediate Au(I) species, gold(I)-sulfide.
Journal ArticleDOI
Gold sol formation mechanisms: Role of colloidal stability
M.K. Chow,Charles F. Zukoski +1 more
TL;DR: In this paper, the formation of uniform gold sols produced by the citrate reduction of auric acid is explored as a function of temperature and reagent concentration, and a particle growth model incorporating colloidal stability is postulated.