Related Experiment Video
Updated: Apr 22, 2026
08:34
A Dual-Functional Electroactive Filter Towards Simultaneously SbIII Oxidation and Sequestration
Published on: December 5, 2019
4.6K
Dissolved organic matter-generated photoelectrons enable microbial antimonate reduction in mine stream sediments
Linao Zhu1, Hanbing Gao1, Min Shen2
1Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, PR China.
Nature Communications
|April 20, 2026
Summary
Naturally occurring dissolved organic matter can fuel microbial antimony reduction in anoxic sediments. This photoelectron supply drives significant antimonate transformation, revealing a novel environmental process for metal detoxification.
Area of Science:
- Environmental Science
- Microbiology
- Geochemistry
Background:
- Mining activities cause persistent antimony contamination in river basins.
- Microbial antimony redox transformation in anoxic sediments is poorly understood.
- Existing knowledge lacks insight into electron donors for microbial antimony reduction in sediments.
Purpose of the Study:
- To investigate the role of photoelectrons from dissolved organic matter in microbial antimonate reduction.
- To identify microbial taxa involved in antimony transformation under photoelectron supply.
- To understand the environmental relevance of this process in mining-impacted sediments.
Main Methods:
- Anoxic sediment microcosms were established with indigenous microbial communities.
- Photoelectron supply was provided by naturally occurring dissolved organic matter under illumination.
- Antimonate reduction was quantified, and microbial communities were analyzed using multi-omics.
Main Results:
- Dissolved organic matter exhibited sustained photocurrent responses.
- Microbial communities achieved 50-70% antimonate reduction with photoelectron supply.
- Non-phototrophic taxa (e.g., Sphingomonas, Bosea) showed enhanced antimony reduction pathways and electron transfer components.
Conclusions:
- Photoelectrons from dissolved organic matter can serve as a significant electron donor for microbial antimonate reduction.
- This process constrains purely abiotic reduction and highlights specific microbial taxa involved in antimony detoxification.
- Photosensitive dissolved organic matter and associated microbes likely play a crucial role in antimony cycling in contaminated anoxic sediments.
More Related Videos
06:52Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron OxyHydroxides, Trace Elements, and Bacteria
Published on: December 19, 2017
6.9K
15:19Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
Published on: October 15, 2015
8.7K
Related Concept Videos
01:19Acid Mine Drainage
96
Mining activities that disturb sulfide-rich rocks, particularly those containing pyrite (FeS₂), initiate a cascade of geochemical and microbiological processes with serious environmental implications. When exposed to air and water, pyrite undergoes oxidation, releasing sulfate, ultimately forming sulfuric acid and mobilizing heavy metals into surrounding water systems. This phenomenon, known as acid mine drainage (AMD), results in low pH waters laden with toxic elements that threaten...
96
01:25Microbial Bioremediation of Uranium
92
Microorganisms play a critical role in the transformation and immobilization of uranium in contaminated environments through four main pathways: bioreduction, biosorption, bioaccumulation, and biomineralization. These mechanisms reduce uranium’s toxicity and prevent its migration through groundwater systems, offering sustainable approaches for in situ bioremediation.Bioreduction of UraniumBioreduction is driven by anaerobic bacteria such as certain strains of Geobacter and Shewanella,...
92
01:27Microbial Leaching
200
Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
200
01:24Microbes and Other Elemental Cycles
78
Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
78
01:24Microbial Corrosion
79
Microbiologically Influenced Corrosion (MIC) is a significant form of material degradation caused by the metabolic activities of microorganisms. This phenomenon poses substantial challenges across various industries, including oil and gas, maritime, and water treatment sectors.MIC occurs when microorganisms, such as bacteria, archaea, and fungi, colonize metal surfaces, forming biofilms that alter the local electrochemical environment. These biofilms can lead to the production of corrosive...
79
01:15Metabolism of Chemolithotrophs
1.3K
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
1.3K