Nanorods of Tellurium: Synthesis and Self-Assembly

Batabyal, Sudip Kumar; Basu, C.; Das, Abhijit; Sanyal, G. S.

doi:10.1166/jnn.2006.108

Cited by 4 publications

(4 citation statements)

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“…Our experiments were equivocal about the pathway of volatile Te production, specifically whether or not Te (0) 6 ]) in the headspace sample, determined by SPME-GC-MS analysis. Values in parentheses are the amounts of precipitated Te, calculated by adding all measurements for each replicate coming from this precipitate in the following experiments.…”

Section: Discussionmentioning

confidence: 68%

“…Strain 13B precipitates Te(0) as intracellular bundles of needles when grown in the presence of tellurite (26). Tellurium-containing nanoparticles have attracted considerable interest because of their semiconductor [i.e., Te(0)] or fluorescence properties (i.e., CdTe or CdSe quantum dots) (4,6,8,16,19). "Green" chemical methods are being sought for the synthetic manufacture of these materials (23).…”

Section: Discussionmentioning

confidence: 99%

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Aeration Controls the Reduction and Methylation of Tellurium by the Aerobic, Tellurite-Resistant Marine Yeast Rhodotorula mucilaginosa

Ollivier

Bahrou

Church

et al. 2011

Appl Environ Microbiol

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We previously described a marine, tellurite-resistant strain of the yeast Rhodotorula mucilaginosa that both precipitates intracellular Te(0) and volatilizes methylated Te compounds when grown in the presence of the oxyanion tellurite. The uses of microbes as a "green" route for the production of Te(0)-containing nanostructures and for the remediation of Te-oxyanion wastes have great potential, and so a more thorough understanding of this process is required. Here, Te precipitation and volatilization catalyzed by R. mucilaginosa were examined in continuously aerated and sealed (low oxygen concentration) batch cultures. Continuous aeration was found to strongly promote Te volatilization while inhibiting Te(0) precipitation. This differs from the results in sealed batch cultures, for which tellurite reduction to Te(0) was found to be very efficient. We show also that volatile Te species may be degraded rapidly in medium and converted to the particulate form by biological activity. Further experiments revealed that Te(0) precipitates produced by R. mucilaginosa can be further transformed to volatile and dissolved Te species. However, it was not clearly determined whether Te(0) is a required intermediate for Te volatilization. Based on these results, we conclude that low oxygen concentrations will be the most efficient for production of Te(0) nanoparticles while limiting the production of toxic volatile Te species, although the production of these compounds may never be completely eliminated. 9), and there has been interest in the microbial production of Te-containing nanoparticles (3) for applications such as composite or compound nanomaterials in solar cells and as an alternative for bench-scale syntheses. We recently described (26) a series of obligately aerobic, tellurite-resistant microbes isolated from salt marsh sediments that efficiently produce intracellular Te-containing nanostructures in a complex growth medium without any specialized growth requirements. The same strains also volatilized a small proportion of the supplied Te as methylated species. Here we further describe the interactions of one of these organisms, the yeast Rhodotorula mucilaginosa, with Te and how these interactions are modulated by aeration.In aerobic soils and aquatic environments, tellurium occurs primarily as the tellurite [TeO 3 2Ϫ or Te(IV)] and tellurate [TeO 4 2Ϫ or Te(VI)] oxyanions. While tellurite is the most water soluble, both are freely available to living organisms.Tellurite has been employed as an antimicrobial therapeutic agent (31, 34), and it is about 10 times more toxic to both Gram-positive and Gram-negative microorganisms than tellurate (37, 39). Tellurite toxicity may be related to its activity as a strong oxidizing agent toward biological materials (17,25,34), although some disagree with this model (40).Microbial tellurite resistance is a widespread phenomenon. In most environments sampled to date, tellurite-resistant organisms comprise ϳ10% of the total culturable microbial population (26,28,32,34). Resistan...

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Section: Discussionmentioning

confidence: 68%

Section: Discussionmentioning

confidence: 99%

Aeration Controls the Reduction and Methylation of Tellurium by the Aerobic, Tellurite-Resistant Marine Yeast Rhodotorula mucilaginosa

Ollivier

Bahrou

Church

et al. 2011

Appl Environ Microbiol

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“…The first is the toxicity associated with these compounds if these organisms are employed for the commercial production of Te nanoparticles as suggested by Baesman et al (6). Tellurium nanoparticles are attracting considerable interest because of their semiconductor and fluorescence properties (CdTe quantum dots) (7,9,12,21,28). "Green" chemical principles have been developed for the synthetic manufacture of these materials (38), and an important consideration for green technologies is the generation of toxic side products of synthetic reactions, like the DMTe, DMDTe, and DMTeS species documented here.…”

Section: Discussionmentioning

confidence: 99%

“…However, it displays strong patterns of enrichment in different environments. In Fe-Mn crusts, it is the most enriched of the trace elements (10 4 -to 10 5 -fold), and it is the seventh most enriched in seawater (ϳ10 9 -fold) relative to its crustal abundance (26). Tellurium was among the last four elements to be quantified in seawater using specialized hydride enrichment and cold vapor atomic absorption techniques (33) that distinguish only the two inorganic species (ϩIV and ϩVI).…”

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confidence: 99%

Volatilization and Precipitation of Tellurium by Aerobic, Tellurite-Resistant Marine Microbes

Ollivier

Bahrou

Marcus

et al. 2008

Appl Environ Microbiol

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Microbial resistance to tellurite, an oxyanion of tellurium, is widespread in the biosphere, but the geochemical significance of this trait is poorly understood. As some tellurite resistance markers appear to mediate the formation of volatile tellurides, the potential contribution of tellurite-resistant microbial strains to trace element volatilization in salt marsh sediments was evaluated. Microbial strains were isolated aerobically on the basis of tellurite resistance and subsequently examined for their capacity to volatilize tellurium in pure cultures. The tellurite-resistant strains recovered were either yeasts related to marine isolates of Rhodotorula spp. or gram-positive bacteria related to marine strains within the family Bacillaceae based on rRNA gene sequence comparisons. Most strains produced volatile tellurides, primarily dimethyltelluride, though there was a wide range of the types and amounts of species produced. For example, the Rhodotorula spp. produced the greatest quantities and highest diversity of volatile tellurium compounds. All strains also produced methylated sulfur compounds, primarily dimethyldisulfide. Intracellular tellurium precipitates were a major product of tellurite metabolism in all strains tested, with nearly complete recovery of the tellurite initially provided to cultures as a precipitate. Different strains appeared to produce different shapes and sizes of tellurium containing nanostructures. These studies suggest that aerobic marine yeast and Bacillus spp. may play a greater role in trace element biogeochemistry than has been previously assumed, though additional work is needed to further define and quantify their specific contributions.Microbial resistance to the inorganic oxyanion tellurite (TeO 3 2Ϫ

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Effect of core size on the luminescence properties of cadmium telluride/zinc sulphide core-shell quantum dots

Sumathi

Sasikala

Rajaram

et al. 2020

Materials Today: Proceedings

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Nanorods of Tellurium: Synthesis and Self-Assembly

Cited by 4 publications

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Aeration Controls the Reduction and Methylation of Tellurium by the Aerobic, Tellurite-Resistant Marine Yeast Rhodotorula mucilaginosa

Aeration Controls the Reduction and Methylation of Tellurium by the Aerobic, Tellurite-Resistant Marine Yeast Rhodotorula mucilaginosa

Volatilization and Precipitation of Tellurium by Aerobic, Tellurite-Resistant Marine Microbes

Effect of core size on the luminescence properties of cadmium telluride/zinc sulphide core-shell quantum dots

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