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Related Concept Videos

Microbes and Other Elemental Cycles01:24

Microbes and Other Elemental Cycles

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...
Microbial Corrosion01:24

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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...
Microbial Leaching01:27

Microbial Leaching

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...
Corrosion02:49

Corrosion

The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
Acid Mine Drainage01:19

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Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...

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Related Experiment Video

Updated: Jul 4, 2026

Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron (Oxy)Hydroxides, Trace Elements, and Bacteria
06:52

Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron (Oxy)Hydroxides, Trace Elements, and Bacteria

Published on: December 19, 2017

Decrease in iron oxidizing activity of Thiobacillus ferrooxidans adsorbed on activated carbon.

T Kai1, T Takahashi, Y Shirakawa

  • 1Department of Chemical Engineering, Kagoshima University, Kagoshima 890, Japan.

Biotechnology and Bioengineering
|December 20, 1990
PubMed
Summary

About 90% of Thiobacillus ferrooxidans adsorbed onto activated carbon. While this enhanced ferrous iron oxidation and copper leaching rates, the bacteria

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Related Experiment Videos

Last Updated: Jul 4, 2026

Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron (Oxy)Hydroxides, Trace Elements, and Bacteria
06:52

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Published on: December 19, 2017

Preparation of Biomass-based Mesoporous Carbon with Higher Nitrogen-/Oxygen-chelating Adsorption for Cu(II) Through Microwave Pre-Pyrolysis
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Preparation of Biomass-based Mesoporous Carbon with Higher Nitrogen-/Oxygen-chelating Adsorption for Cu(II) Through Microwave Pre-Pyrolysis

Published on: February 12, 2019

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08:01

Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide

Published on: June 28, 2019

Area of Science:

  • Microbial biotechnology
  • Environmental science
  • Biogeochemical cycles

Background:

  • Thiobacillus ferrooxidans plays a key role in iron oxidation and metal leaching.
  • Activated carbon is often used as a support material in bioreactors.
  • Understanding microbial-material interactions is crucial for optimizing industrial processes.

Purpose of the Study:

  • To investigate the adsorption of Thiobacillus ferrooxidans on activated carbon.
  • To evaluate the impact of adsorbed bacteria on ferrous iron oxidation and copper ore leaching.
  • To determine the contribution of adsorbed Thiobacillus ferrooxidans to reaction rates.

Main Methods:

  • Cultivation of Thiobacillus ferrooxidans in 9K medium.
  • Adsorption of bacteria onto activated carbon.
  • Ferrous iron oxidation and copper ore leaching experiments in shake flasks and aerated columns.
  • Kinetic analysis to determine reaction rates and bacterial contribution.

Main Results:

  • Approximately 90% of Thiobacillus ferrooxidans adsorbed onto activated carbon at high cell concentrations (4 x 10^13 cells m^-3).
  • Enhanced rates of ferrous iron oxidation and copper ore leaching were observed when using bacteria adsorbed on activated carbon.
  • Kinetic analysis revealed a minimal contribution of the adsorbed microorganisms to the overall reaction rates, suggesting a significant catalytic effect from the activated carbon itself.

Conclusions:

  • Activated carbon effectively adsorbs Thiobacillus ferrooxidans.
  • While adsorbed bacteria enhance oxidation and leaching rates, activated carbon exhibits a more dominant catalytic role.
  • Further research is needed to fully elucidate the synergistic effects between Thiobacillus ferrooxidans and activated carbon in biogeochemical processes.