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Synthesis of zinc-gallate phosphors by biomineralization and their emission properties. Acta Biomater 2019; 97:557-564. [PMID: 31374337 DOI: 10.1016/j.actbio.2019.07.052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 07/20/2019] [Accepted: 07/26/2019] [Indexed: 11/21/2022]
Abstract
Reduction of target species by microorganisms and their subsequent precipitation into sparingly soluble mineral phase nanoparticles have been referred to as microbially mediated nanomaterial synthesis. Here, we describe the microbially mediated production of nano-dimensioned spinel structured zinc-gallate (ZnGa2O4) phosphors exhibiting different emission performance with varying substituted elements. Interestingly, in the microbially mediated phosphor production described herein, there were no reducible metal- and non-metal species composing the target minerals. By varying substituted elements, zinc-gallate phosphors present typical red, green, and blue (RGB) emission. An apparent whitish emission was accomplished by blending phosphors. A promising potential for white light produced by biosynthesized mixtures of Cr-, Mn-, and Co- substituted zinc-gallates representing RGB emissions was evidenced. Microbial activity supplied a reducing driving force and provided appropriate near neutral pH and reduced Eh conditions to thermodynamically precipitate spinel structured nanomaterials from supersaturated divalent and trivalent cations. This result complemented conventional biomineralization concepts and expanded the realm of biomanufacturing nanomaterials for further applications. STATEMENT OF SIGNIFICANCE: This study substantiated that circumstances of a suitable pH/Eh derived from bacterial activity, divalent/trivalent ion supply, buffering capacity, and supersaturation could precipitate spinel structure nanoparticles. Even though live or dead cells with membrane could enhance the nuclei generation, the spinel structured phases were produced regardless of existence of live or dead cells and reducible metal or non-metal species incorporating into the produced solid phases. This finding led to production of a series of metal-substituted zinc-gallates with specific RGB emission that can result in whitish light using simple blending. We believe our findings could expand the realm of nanomaterial synthesis using low cost, highly scalable bio-nanotechnology.
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Moon JW, Eskelsen JR, Ivanov IN, Jacobs CB, Jang GG, Kidder MK, Joshi PC, Armstrong BL, Pierce EM, Oremland RS, Phelps TJ, Graham DE. Improved ZnS nanoparticle properties through sequential NanoFermentation. Appl Microbiol Biotechnol 2018; 102:8329-8339. [PMID: 30078139 DOI: 10.1007/s00253-018-9245-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 07/12/2018] [Accepted: 07/13/2018] [Indexed: 10/28/2022]
Abstract
Sequential NanoFermentation (SNF) is a novel process which entails sparging microbially produced gas containing H2S from a primary reactor through a concentrated metal-acetate solution contained in a secondary reactor, thereby precipitating metallic sulfide nanoparticles (e.g., ZnS, CuS, or SnS). SNF holds an advantage over single reactor nanoparticle synthesis strategies, because it avoids exposing the microorganisms to high concentrations of toxic metal and sulfide ions. Also, by segregating the nanoparticle products from biological materials, SNF avoids coating nanoparticles with bioproducts that alter their desired properties. Herein, we report the properties of ZnS nanoparticles formed from SNF as compared with ones produced directly in a primary reactor (i.e., conventional NanoFermentation, or "CNF"), commercially available ZnS, and ZnS chemically synthesized by bubbling H2S gas through a Zn-acetate solution. The ZnS nanoparticles produced by SNF provided improved optical properties due to their smaller crystallite size, smaller overall particle sizes, reduced biotic surface coatings, and reduced structural defects. SNF still maintained the advantages of NanoFermentation technology over chemical synthesis including scalability, reproducibility, and lower hazardous waste burden.
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Affiliation(s)
- Ji-Won Moon
- Biosciences Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN, 37831, USA. .,National Minerals Information Center, United States Geological Survey, Reston, VA, 20192, USA.
| | | | - Ilia N Ivanov
- Center for Nanophase Materials Sciences, ORNL, Oak Ridge, TN, 37831, USA
| | | | - Gyoung Gug Jang
- Energy & Transportation Science Division, ORNL, Oak Ridge, TN, 37831, USA
| | | | - Pooran C Joshi
- Material Science and Technology Division, ORNL, Oak Ridge, TN, 37831, USA
| | - Beth L Armstrong
- Material Science and Technology Division, ORNL, Oak Ridge, TN, 37831, USA
| | - Eric M Pierce
- Environmental Sciences Division, ORNL, Oak Ridge, TN, 37831, USA
| | | | - Tommy J Phelps
- Biosciences Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN, 37831, USA
| | - David E Graham
- Biosciences Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN, 37831, USA
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Moon JW, Phelps TJ, Fitzgerald Jr CL, Lind RF, Elkins JG, Jang GG, Joshi PC, Kidder M, Armstrong BL, Watkins TR, Ivanov IN, Graham DE. Manufacturing demonstration of microbially mediated zinc sulfide nanoparticles in pilot-plant scale reactors. Appl Microbiol Biotechnol 2016; 100:7921-31. [DOI: 10.1007/s00253-016-7556-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 04/06/2016] [Accepted: 04/14/2016] [Indexed: 10/21/2022]
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Moon JW, Cho KS, Moberly JG, Roh Y, Phelps TJ. Simultaneous leaching and carbon sequestration in constrained aqueous solutions. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2011; 33:543-557. [PMID: 21246259 DOI: 10.1007/s10653-010-9370-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2009] [Accepted: 12/31/2010] [Indexed: 05/30/2023]
Abstract
The behavior of metal ions' leaching and precipitated mineral phases of metal-rich fly ash (FA) was examined in order to evaluate microbial impacts on carbon sequestration and metal immobilization. The leaching solutions consisted of aerobic deionized water (DW) and artificial eutrophic water (AEW) that was anaerobic, organic- and mineral-rich, and higher salinity as is typical of bottom water in eutrophic algae ponds. The Fe- and Ca-rich FAs were predominantly composed of quartz, mullite, portlandite, calcite, hannebachite, maghemite, and hematite. After 86 days, only Fe and Ca contents exhibited a decrease in leaching solutions while other major and trace elements showed increasing or steady trends in preference to the type of FA and leaching solution. Ca-rich FA showed strong carbon sequestration efficiency ranging up to 32.3 g CO(2)/kg FA after 86 days, corresponding to almost 65% of biotic carbon sequestration potential under some conditions. Variations in the properties of FAs such as chemical compositions, mineral constituents as well as the type of leaching solution impacted CO(2) capture. Even though the relative amount of calcite increased sixfold in the AEW and the relative amount of mineral phase reached 37.3 wt% using Ca-rich FA for 86 days, chemical sequestration did not accomplish simultaneous precipitation and sequestration of several heavy metals.
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Affiliation(s)
- Ji-Won Moon
- Biosciences Division, Oak Ridge National Laboratory, TN 37831, USA
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