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Kondo S, Hayashi K, Phann I, Okibe N. Bioleaching of tennantite concentrate: influence of microbial community and solution redox potential. Front Microbiol 2024; 14:1339549. [PMID: 38260872 PMCID: PMC10800565 DOI: 10.3389/fmicb.2023.1339549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Accepted: 12/20/2023] [Indexed: 01/24/2024] Open
Abstract
Despite its growing importance as a Cu resource, studies on tennantite bioleaching are highly limited. One of the key challenges in processing such Cu-As sulfides is their refractoriness and the solubilisation of toxic As. The ultimate goal is to achieve selective bioleaching of Cu with simultaneous immobilisation of As in the leach residues. This study investigated the effectiveness of activated carbon (AC)-assisted bioleaching of tennantite concentrate using a mixed culture containing various "strong" and "weak" Fe-oxidising bacteria/archaea plus a S-oxidising bacterium, with particular emphasis on controlling the solution redox potential (Eh). In the initial flask bioleaching tests, a steady increase in Eh (up to 840 mV) was observed, reflecting the activity of "strong" Fe-oxidisers. In this situation, AC dosing effectively suppressed the Eh value and the highest Cu dissolution (70%) was obtained in the AC-0.01% system, while simultaneously immobilising As. In order to maximise Cu dissolution and As immobilisation, it was found preferable to target the Eh range of 650-700 mV during bioleaching. The next bioreactor tests used the mixed culture of the same origin, but had been subcultured a few generations further on tennantite concentrate. The Eh level remained unexpectedly low (~630 mV) for most of the leaching period, regardless of the AC dosage. It was later found that the bioreactor systems were almost exclusively dominated by Sb. thermosulfidooxidans, a "weak" Fe oxidiser with high Cu/As tolerance. In this case, there was no need to artificially suppress the Eh level by AC dosing and Cu leached readily to a final Cu dissolution of ~60% while As dissolution was suppressed to ~15%. Thus, depending on the microbial community that develops at the processing site, Eh control can be achieved either naturally by the activity of "weak" Fe-oxidisers as the predominant survivors under high Cu/As stress, or artificially by the addition of an Eh regulator such as a carbon catalyst.
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Affiliation(s)
| | | | | | - Naoko Okibe
- Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka, Japan
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Li B, Zhang L, Yin W, Lv S, Li P, Zheng X, Wu J. Effective immobilization of hexavalent chromium from drinking water by nano-FeOOH coating activated carbon: Adsorption and reduction. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 277:111386. [PMID: 33049610 DOI: 10.1016/j.jenvman.2020.111386] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 08/28/2020] [Accepted: 09/20/2020] [Indexed: 06/11/2023]
Abstract
In this study, nano α-FeOOH (nFeOOH, 100-500 nm) was coated onto activated carbon (nFeOOH@AC) through a dipping means for enhanced Cr(VI) immobilization from drinking water. The nFeOOH@AC significantly improved the Cr(VI) removal from 19.9% (AC control) to 93.4%. XPS spectra and chromium speciation demonstrated that about 90% of adsorbed Cr(VI) was converted to Cr(III) by the nFeOOH@AC, accompanying with a reduction-oxidation of Fe3+/Fe2+ in the nFeOOH matrix due to electrons delivering between AC and surface-bound Cr(VI). The resultant Cr(III) subsequently reacted with Fe(III) to generate stable (CrχFe1-χ)(OH)3 precipitates, leading to a much lower Cr(III) release of 7.5% back to solution by the nFeOOH@AC as compared to the AC control of 33.8%, indicating that the nFeOOH@AC had a prospective potential for Cr(VI) immobilization and decreased Cr residue in treated drinking water. Results from column experiment also showed that the nFeOOH@AC afforded a 3.5 times higher capacity for Cr(VI) immobilization and a 3.4 times longer life-span than the pristine AC. Besides, Cr(VI) immobilization by the nFeOOH@AC was a pH-dependent process and the adsorbed Cr on the nFeOOH@AC could be readily desorbed with acetic acid. The disabled nFeOOH@AC could be refreshed by recoating nFeOOH particles with the above dipping method after stripping all the iron oxides with hydrochloric acid. This study demonstrated that nFeOOH coating is an efficient approach to enhance Cr(VI) elimination by AC during drinking water treatments.
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Affiliation(s)
- Bing Li
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China; Light Chemical Engineering Department, Guangdong Polytechnic, Foshan, 528041, China
| | - Li Zhang
- Light Chemical Engineering Department, Guangdong Polytechnic, Foshan, 528041, China
| | - Weizhao Yin
- School of Environment, Jinan University, Guangzhou, 510632, China
| | - Sihao Lv
- School of Chemistry and Environmental Engineering, Dongguan University of Technology, Dongguan, 523808, China
| | - Ping Li
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Xiangyu Zheng
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Jinhua Wu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, 510006, China; The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou, 510006, China.
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Yumak T, Yakaboylu GA, Oginni O, Singh K, Ciftyurek E, Sabolsky EM. Comparison of the electrochemical properties of engineered switchgrass biomass-derived activated carbon-based EDLCs. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2019.124150] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Zhu Y, Li H, Zhang G, Meng F, Li L, Wu S. Removal of hexavalent chromium from aqueous solution by different surface-modified biochars: Acid washing, nanoscale zero-valent iron and ferric iron loading. BIORESOURCE TECHNOLOGY 2018; 261:142-150. [PMID: 29656227 DOI: 10.1016/j.biortech.2018.04.004] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Revised: 03/30/2018] [Accepted: 04/01/2018] [Indexed: 06/08/2023]
Abstract
Willow residue biochar (BC) and modified biochars (hydrochloric acid washing (HBC), HBC loaded with nanoscale zero-valent iron (nZVI-HBC), and HBC loaded with ferric iron (Fe3+-HBC)) after aging were used for aqueous Cr(VI) removal. HBC (>98.67%), nZVI-HBC (>98.86%), and Fe3+-HBC (>99.64%) kept high Cr(VI) removal rates under the acidic conditions within a wide pH range (<7.0), indicating their good adaptability to pH change because of aging. Cr(VI) reduction to Cr(III) was the dominant removal mechanism. The formation of COOH on BC, HBC, and nZVI-HBC indicates the oxidation of surface functional groups by Cr(VI) and simultaneous Cr(VI) reduction. The disappearance of nZVI peaks indicates the reduction of Cr(VI) to Cr(III) by nZVI. The color reaction result demonstrated that the converted Fe2+ in Fe3+-HBC contributed to Cr(VI) reduction. Taking into account the removal efficiency, recyclability, cost, preparation process, and stability of adsorbents, Fe3+-HBC was recommended for Cr(VI) removal.
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Affiliation(s)
- Yuen Zhu
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Hua Li
- School of Environment and Resources, Shanxi University, Taiyuan 030006, China
| | - Guixiang Zhang
- College of Environment and Safety, Taiyuan University of Science and Technology, Taiyuan 030024, China.
| | - Fanjian Meng
- School of Environment and Resources, Shanxi University, Taiyuan 030006, China
| | - Lifen Li
- School of Environment and Resources, Shanxi University, Taiyuan 030006, China
| | - Shan Wu
- Poyang Lake Key Laboratory of Environment and Resource Utilization (Nanchang University), Ministry of Education, School of Resource, Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China; Guangdong Institute of Eco-Environmental Science and Technology, Guangzhou 510650, China
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Ji S, Miao C, Liu H, Feng L, Yang X, Guo H. A Hydrothermal Synthesis of Fe 3O 4@C Hybrid Nanoparticle and Magnetic Adsorptive Performance to Remove Heavy Metal Ions in Aqueous Solution. NANOSCALE RESEARCH LETTERS 2018; 13:178. [PMID: 29900488 PMCID: PMC5999597 DOI: 10.1186/s11671-018-2580-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 05/24/2018] [Indexed: 05/12/2023]
Abstract
Advanced core-shelled material with a high specific area has been considered as an effective material to remove heavy metal from aqueous solutions. A core-shelled Fe3O4@C hybrid nanoparticle aggregates with environmental-friendly channel in the study. Moreover, the higher exposure of adsorption sites can be achieved for the special configuration that higher Brunauer-Emmet-Teller (BET) surface area reaches up to 238.18 m2 g-1. Thus, a more efficiently heavy metal ion removal is obtained, Pb (II), Cd (II), Cu (II), and Cr (VI) up to 100, 99.2, 96.6, and 94.8%, respectively. In addition, the products are easy to be separated from the aqueous solutions after adsorption, due to the relative large submicrometer size and the enhanced external magnetic fields introduced by the iron-based cores. We provide an ideal mode to remove heavy metal ions using core-shelled Fe3O4@C under the water treatment condition. A new approach is clarified that core-shell nano/micro-functional materials can be synthesized well on large scales which are used in many fields such as environmental remediation, catalyst, and energy.
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Affiliation(s)
- Siping Ji
- School of Chemistry Science and Engineering, Yunnan University, No. 2, CuiHu North Road, Kunming, 650091 China
- Joint Research Centre for International Cross-border Ethnic Regions Biomass Clean Utilization in Yunnan, Yunnan University of Nationalities, Kunming, 650500 China
| | - Changlin Miao
- School of Chemistry Science and Engineering, Yunnan University, No. 2, CuiHu North Road, Kunming, 650091 China
| | - Hui Liu
- School of Chemistry Science and Engineering, Yunnan University, No. 2, CuiHu North Road, Kunming, 650091 China
| | - Lili Feng
- Joint Research Centre for International Cross-border Ethnic Regions Biomass Clean Utilization in Yunnan, Yunnan University of Nationalities, Kunming, 650500 China
| | - Xiangjun Yang
- School of Chemistry Science and Engineering, Yunnan University, No. 2, CuiHu North Road, Kunming, 650091 China
| | - Hong Guo
- School of Chemistry Science and Engineering, Yunnan University, No. 2, CuiHu North Road, Kunming, 650091 China
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Wang H, Yu YF, Chen QW, Cheng K. Carboxyl-functionalized nanoparticles with magnetic core and mesopore carbon shell as adsorbents for the removal of heavy metal ions from aqueous solution. Dalton Trans 2011; 40:559-63. [DOI: 10.1039/c0dt01170c] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zhang D, Wei S, Kaila C, Su X, Wu J, Karki AB, Young DP, Guo Z. Carbon-stabilized iron nanoparticles for environmental remediation. NANOSCALE 2010; 2:917-919. [PMID: 20648288 DOI: 10.1039/c0nr00065e] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Ferromagnetic carbon-coated Fe nanoparticles (core size of 15 nm, saturated magnetization of Ms=218 emu g(-1) and coercivity of Hc=62 Oe), fabricated at a mild temperature, demonstrate a strong ability to effectively remove more than 95 wt% of Cr(VI) in waste water via carbon shell physical adsorption, which is much higher than the commercially available Fe NPs.
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Affiliation(s)
- Di Zhang
- Dan F. Smith Department of Chemical Engineering, Lamar University, Beaumont, TX 77710, USA
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Bechara MA, Heinemann PH, Walker PN, Demirci A, Romaine CP. Evaluating the addition of activated carbon to heat-treated mushroom casing for grain-based and compost-based substrates. BIORESOURCE TECHNOLOGY 2009; 100:4441-4446. [PMID: 19435659 DOI: 10.1016/j.biortech.2008.12.064] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2007] [Revised: 05/16/2008] [Accepted: 12/22/2008] [Indexed: 05/27/2023]
Abstract
Two substrates, a non-composted grain spawn substrate and a traditional composted substrate, each covered with peat-based casing that contained varying amounts of activated carbon (AC) and each receiving different heat-treatment durations, were tested for Agaricus bisporus mushroom production. The amounts of AC were 0, 5, 10, 15, and 20% v/v, and the heat treatments were 0, 60, and 180 min at 121 degrees C and 103.4 kPa. Overall, the addition of AC up to 10-15% of casing for a grain spawn substrate increased mushroom yield. However, the addition of AC to the casing for compost substrates had no significant effect on yield, whereas heat-treating the casing increased yield. The onset of fruiting was retarded in grain spawn treatments not receiving AC with heat-treatment durations of 60 and 180 min, whereas this effect was not as apparent for the compost substrates. On average, mushroom yield was greater for the grain spawn substrate (366 g) than for compost substrate (287 g). For grain spawn substrate, the results show that the addition of AC ranging from 5% to 10% was adequate for maximum mushroom production.
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Affiliation(s)
- Mark A Bechara
- Department of Agricultural and Biological Engineering, The Pennsylvania State University, University Park, PA 16802, USA
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Guo B, Zebda R, Drake SJ, Sayes CM. Synergistic effect of co-exposure to carbon black and Fe2O3 nanoparticles on oxidative stress in cultured lung epithelial cells. Part Fibre Toxicol 2009; 6:4. [PMID: 19203368 PMCID: PMC2644663 DOI: 10.1186/1743-8977-6-4] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2008] [Accepted: 02/09/2009] [Indexed: 12/02/2022] Open
Abstract
Background There is a need to better understand synergism in the biological effects of particles composed of multiple substances. The objective of this study was to determine if the oxidative stress in cultured cells caused by co-exposure to carbon black and Fe2O3 nanoparticles was significantly greater than the additive effects of exposure to either type of particles alone; and to determine a possible cause for such synergistic effect if one was found. Cultured A549 human lung epithelial cells were exposed to (1) carbon black nanoparticles alone, (2) Fe2O3 nanoparticles alone, and (3) both types of particles simultaneously. Protein oxidation, lipid peroxidation, and cellular uptake of Fe in these cells were measured after 25 hours of exposure. The reduction of solubilized Fe3+ by the carbon black nanoparticles was measured separately in a cell-free assay, by incubating the carbon black and the Fe2O3 nanoparticles in 0.75 M sulfuric acid at 40°C and measuring the amount of reduced Fe3+ at different time points up to 24 hours. Results Cells exposed to carbon black particles alone did not show protein oxidation, nor did the cells exposed to Fe2O3 particles alone, relative to the control. However, cells co-exposed to both carbon black and Fe2O3 particles showed up to a two-fold increase in protein oxidation relative to the control. In addition, co-exposure induced significant lipid peroxidation, although exposure to either particle type alone did not. No significant difference in cellular iron uptake was found between single exposure and co-exposure, when the Fe2O3 dosing concentration was the same in each case. In the cell-free assay, significant reduction of Fe3+ ions by carbon black nanoparticle was found within 2 hour, and it progressed up to 24 hours. At 24 hours, the carbon black nanoparticles showed a reductive capacity of 0.009 g/g, defined as the mass ratio of reduced Fe3+ to carbon black. Conclusion Co-exposure to carbon black and Fe2O3 particles causes a synergistic oxidative effect that is significantly greater than the additive effects of exposures to either particle type alone. The intracellular redox reaction between carbon black and Fe3+ is likely responsible for the synergistic oxidative effect. Therefore elemental carbon particles and fibres should be considered as potential reducing agents rather than inert materials in toxicology studies. Acidified cell organelles such as the lysosomes probably play a critical role in the solubilization of Fe2O3. Further research is necessary to better understand the mechanisms.
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Affiliation(s)
- Bing Guo
- Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843, USA.
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Su H, Dong Q, Han J, Zhang D, Guo Q. Biogenic synthesis and photocatalysis of Pd-PdO nanoclusters reinforced hierarchical TiO2 films with interwoven and tubular conformations. Biomacromolecules 2008; 9:499-504. [PMID: 18186610 DOI: 10.1021/bm700993m] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hierarchical nanocomposite films with Pd-PdO nanoparticles anchored uniformly on the inner surface of TiO2 nanotubes were achieved through a stepwise bioredox/artificial oxygenation approach by using the natural eggshell membrane (ESM) as a template. The Pd content ratio of Pd-PdO loading could be arbitrarily varied from 0 to 53 wt %, and the ESM-morphic nanocomposites Pd-PdO/TiO2 exhibited porous and multiphasic features, facilitating light transport and molecule accessibility to the active site during photocatalytic reactions. The photocatalytic activity of target nanocomposites was determined by the degradation of rhodamine B. The composites with a ratio of 10 wt % TiO2 (5 wt % Pd of Pd-PdO loading) presented a high degradation efficiency of 99.3% and showed good stability with a second run of about 95.3% and a third run of 94.6%. These composites with structural particularity and complexity are expected to find potential applications in various fields, such as photovoltaic devices, gas sensors, antistatic coating, dye-sensitized solar cells, etc.
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Affiliation(s)
- Huilan Su
- State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200030, People's Repiblic of China.
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Na C, Cannon FS, Hagerup B. Perchlorate removal via IRON-PRELOADED GAC and BOROHYDRIDE REGENERATION. ACTA ACUST UNITED AC 2002. [DOI: 10.1002/j.1551-8833.2002.tb10233.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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