Article
Environmental Sciences
Wenbo Li, Qiyan Feng, Gordon Southam, Tao Jin, Ze Li
Summary: To investigate the formation mechanism of acid mine drainage (AMD) from coal mine spoil, microbial shake flask experiments were conducted, revealing that microbial-mediated sulfur oxidation plays a crucial role in coal mine acidification. The oxidation of pyrite sulfur and thiophene sulfur contribute significantly to acid production, with the emergence of new iron and sulfur oxidizing bacterial species. These bacteria showed higher resilience and faster proliferation compared to A. ferrooxidans YQ-N3 when favorable conditions were present.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geochemistry & Geophysics
Wenbo Li, Qiyan Feng, Ze Li
Summary: A novel strain of Acidithiobacillus ferrooxidans, named YQ-N3, was isolated from the sediments of a river polluted by acid mine drainage in Shanxi, China. The whole genome sequencing revealed a 3,217,720 bp genome composed of a circular chromosome and five circular plasmids, including a new plasmid not annotated in the reference database. YQ-N3 has a close evolutionary relationship with ATCC23270 and JCM18981, and shows higher genomic similarity with ATCC23270. It exhibits multiple genes related to environmental resistance and iron and sulfur metabolism, and has the ability to enhance the oxidation rate of Fe2+ and S-0, as well as the hydrophilicity of S-0. YQ-N3 also demonstrates potential in biological desulfurization of coal.
Article
Microbiology
Eduardo A. Moncayo, Alexis Debut, Karla Vizuete, Diana Jumbo-Flores, Paulina Aguirre
Summary: In this study, the researchers evaluated the attachment behavior of Acidithiobacillus ferrooxidans on a polymetallic sulfide ore from Ecuador, mediated by the production of extracellular polymeric substances (EPS). They found that the highest attachment rate was achieved at specific galactose and iron ion concentrations, suggesting a potential increase in biooxidation and bioleaching rates.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Microbiology
Xue-Yan Gao, Chang-Ai Fu, Likai Hao, Xiu-Feng Gu, Rui Wang, Jian-Qiang Lin, Xiang-Mei Liu, Xin Pang, Cheng-Jia Zhang, Jian-Qun Lin, Lin-Xu Chen
Summary: This study discovered a LuxI/R-like quorum sensing system (AfeI/R) in acidophilic and chemoautotrophic Acidithiobacillus spp., and investigated its regulatory effects on gene expression, cell growth, and population density of A. ferrooxidans under different energy substrates. The findings revealed an energy-substrate-dependent regulation mode of AfeI/R in A. ferrooxidans, showcasing distinct regulation strategies mediated by acyl-HSLs synthesized by AfeI.
ENVIRONMENTAL MICROBIOLOGY
(2021)
Article
Engineering, Chemical
Alessandro Becci, Alessia Amato, Jose M. Rodriguez-Maroto, Francesca Beolchini
Summary: This work conducted a kinetic study on the bioleaching process for copper extraction from waste printed circuit boards using iron as an oxidant agent. The developed model consisted of three differential equations characterizing bacteria metabolism, Fe2+ oxidation, and Cu extraction. Results showed that bacteria metabolism was faster than the chemical reaction.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Engineering, Chemical
Alfonso Mazuelos, Martin Moreno-Perez, Blanca Perdigones, Pablo Ramirez, Nieves Iglesias-Gonzalez
Summary: The utility of ferrous iron biooxidation is important for regenerating Fe(III) in specific hydrometallurgical contexts. Increasing [Fe(III)] can improve reaction kinetics, but pH must be decreased to prevent precipitation. Limited information is available on continuous biooxidation operation, so it is interesting to test wider parameter ranges.
MINERALS ENGINEERING
(2023)
Article
Microbiology
Jiani Yang, Shuang Zhang, Yu Zhang, Dan Zhao, Tao Liu, Xindi Sun, Lei Yan
Summary: Understanding the molecular mechanism of magnetite (Fe3O4) nanoparticle synthesis in Acidithiobacillus ferrooxidans BYM is crucial for the commercial development of biogenic Fe(3)O(4) nanoparticles. Different treatment conditions, such as FeSO4 center dot 7H(2)O concentrations, growth times, and magnetic field intensities, significantly affected intracellular iron content and the number and size of Fe3O4 nanoparticles. Transcriptome analysis identified differentially expressed genes (DEGs) and significant expression profiles, enriching ion transport, oxidation-reduction process, membrane structure, signal transduction, and quorum sensing. Gene regulatory networks associated with Fe3O4 nanoparticle synthesis revealed modules significantly correlated with phenomic parameters. Ten hub genes significantly correlated with Fe3O4 nanoparticle phenomic parameters were selected from 24 eigengenes related to iron metabolism. Based on previous research and present findings, a hypothetical molecular model for Fe3O4 nanoparticle synthesis mediated by these hub genes was proposed, involving membrane formation, iron uptake and transport, iron redox, and crystal maturity.
MICROBIOLOGY SPECTRUM
(2023)
Article
Environmental Sciences
Huixin Xiong, Suning Peng, Bailin Zhang
Summary: In this study, the bioformation of akaganeite in FeCl2 solutions mediated by Acidithiobacillus ferrooxidans cells was investigated. The obtained products were characterized, revealing the formation of nanospindle-shaped akaganeite powders. It was observed that the ferric precipitates grew along the exterior structures of cells, resulting in the formation of cellular-shaped assemblages.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Review
Plant Sciences
Bing Yang, Chenyun Xu, Yuting Cheng, Ting Jia, Xueyun Hu
Summary: Iron-sulfur (Fe-S) clusters are ancient protein cofactors that exist ubiquitously in organisms and play important roles in various life processes. Plastids, semi-autonomous organelles believed to originate from cyanobacterial endosymbionts, have a Fe-S cluster biosynthesis and delivery pathway similar to cyanobacteria. Fe-S clusters are crucial for the normal functioning of downstream Fe-S proteins in plastids. Recent research has made significant progress in understanding this pathway and this review summarizes these findings as well as the remaining scientific challenges.
PLANT CELL REPORTS
(2023)
Article
Engineering, Environmental
A. Santaolalla, J. Gutierrez, G. Gallastegui, A. Barona, N. Rojo
Summary: This study utilized bacterial cellulose as a novel support material for immobilizing Acidithiobacillus ferrooxidans, aiming to enhance the performance of bioleaching. The results showed that the BC allowed for effective immobilization of the bacteria and provided insights into the impact of various operating parameters on the process. Furthermore, the study revealed that the bacterial activity was successfully recovered after storage and that bacterial cellulose could potentially improve the efficiency of bioleaching.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Xiaoxiao Guo, Siming Chen, Yawei Han, Chunbo Hao, Xiujuan Feng, Baogang Zhang
Summary: This study investigated the bioleaching of vanadium-bearing smelting ash using Acidithiobacillus ferrooxidans. The results showed that Acidithiobacillus ferrooxidans had a high leaching potential for vanadium and could transfer reducible, oxidizable, and acid-soluble fractions into the leaching liquor. Therefore, bioleaching was proposed as an efficient alternative to chemical/physical processes for enhancing vanadium recovery from vanadium-bearing smelting ash.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Qing Yi, Songlin Wu, Yunjia Liu, Ting-Shan Chan, Ying-Rui Lu, Narottam Saha, Gordon Southam, Longbin Huang
Summary: The growth and functions of acidophilic sulfur oxidizing bacterium (SOB) A. ferrooxidans in Fe ore tailings are influenced by pH conditions. Acidic conditions (pH < 6) support SOB growth and mineral weathering, while neutral/alkaline conditions (pH > 7) restrict SOB growth and functions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Physical
Rui Xu, Qian Li, Xiaolong Nan, Guoqing Jiang, Limin Wang, Jing Xiong, Yongbin Yang, Bin Xu, Tao Jiang
Summary: A green kaolin@Fe-Mn binary (hydr)oxides composite synthesized by iron oxidizing bacteria (IOB) mediation was developed as a potential adsorbent for the simultaneous removal of antimony (Sb) and arsenic (As) from contaminated water. The composite showed high specific surface area and pore volume, and exhibited efficient removal of Sb and As with adsorption capacities of 177.19, 56.26, 62.92, and 42.18 mg/g for Sb(III), Sb(V), As(III), and As(V), respectively. The kinetics data followed the pseudo-second-order kinetic and Elovich models, and the mechanism of adsorption involved inner-sphere complexation, surface complexation, hydrogen bonding, and oxidation.
APPLIED CLAY SCIENCE
(2022)
Article
Engineering, Chemical
Chunxiao Zhao, Baojun Yang, Rui Liao, Maoxin Hong, Shichao Yu, Shitong Liu, Jun Wang, Guanzhou Qiu
Summary: The presence of visible light and Ag+ significantly improved the copper extraction in chalcopyrite bioleaching, with specific mechanisms leading to enhanced dissolution rate and charge transfer. Light illumination helped reduce the resistance of the passivation layer and promote the accumulation of Ag2S and Ag-0 on the chalcopyrite surface.
MINERALS ENGINEERING
(2022)
Article
Agricultural Engineering
Xinxin Liu, Shuhan Xin, Bingbing Wang, Yin Yuan, Jizhuang Chu, Yihang He, Xinru Zhang, Shiliang Wang
Summary: In this study, iron oxides-biochar composites (ALBC) were prepared by modifying pristine biochar with Acidithiobacillus ferrooxidans (A. ferrooxidans) and pyrolyzing it at 500°C and 700°C to remove antimonite (Sb (III)) and antimonate (Sb(V)) from water. The results showed that biochar prepared at 500°C and 700°C (ALBC500 and ALBC700) contained Fe2O3 and Fe3O4, respectively. The bacterial modification systems decreased the concentrations of ferrous iron and total iron. The pH values of the systems with ALBC500 increased first and then stabilized, while the systems with ALBC700 continued to decrease. The optimal adsorption capacities for Sb(III) and Sb(V) were achieved by ALBC500 (18.81 mg center dot g(-1)) and ALBC (14.64 mg center dot g(-1)), respectively. The main mechanisms of Sb(III) and Sb(V) adsorption by ALBC were electrostatic interaction and pore filling.
BIORESOURCE TECHNOLOGY
(2023)
