Catalytic mechanism of manganese ions and visible light on chalcopyrite bioleaching in the presence of <i>Acidithiobacillus ferrooxidans</i>

Chunxiao Zhao; Baojun Yang; Rui Liao; Maoxin Hong; Shichao Yu; Jun Wang; Guanzhou Qiu

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Catalytic mechanism of manganese ions and visible light on chalcopyrite bioleaching in the presence of Acidithiobacillus ferrooxidans

Biotechnology and Bioengineering | Updated：2026-01-06

- Catalytic mechanism of manganese ions and visible light on chalcopyrite bioleaching in the presence of Acidithiobacillus ferrooxidans
- Chinese Journal of Chemical Engineering Vol. 41, Issue 1, Pages: 457-465(2022)
- Affiliations：
  
  Key Laboratory of Biohydrometallurgy of Ministry of Education, School of Minerals Processing & Bioengineering, Central South University,Changsha,China,410083
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2022
- Accepted：
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[J]. 中国化学工程学报, 2022, 41(1): 457-465.
DOI：

[J]. 中国化学工程学报, 2022, 41(1): 457-465. DOI：

摘要

Abstract

The bioleaching of chalcopyrite is low cost and environmentally friendly

but the leaching rate is low. To explore the mechanism of chalcopyrite bioleaching and improve its leaching rate

the effect and mechanism of manganese ions (Mn

) and visible light on chalcopyrite mediated by

Acidithiobacillus ferrooxidans

(

A. ferrooxidans

) were discussed. Bioleaching experiments showed that when both Mn

and visible light were present

the copper extraction was 14.38% higher than that of the control system (without Mn

and visible light). Moreover

visible light and Mn

promoted the growth of

A. ferrooxidans

. Scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) analysis revealed that Mn

promoted the formation of extracellular polymeric substance (EPS) on the surface of chalcopyrite

changed the morphology of

A. ferrooxidans

enhanced the adsorption of bacteria on chalcopyrite surface with light illumination

and thus promoted the bioleaching of chalcopyrite. UV–vis absorbance spectra indicated that Mn

promoted the response of chalcopyrite t

o visible light and enhanced the catalytic effect of visible light on chalcopyrite bioleaching. Based on X-ray photoelectron spectroscopy (XPS)

the relevant sulfur speciation of chalcopyrite before and after bioleaching were analyzed and the results revealed that visible light and Mn

promoted chalcopyrite bioleaching by reducing the formation of passivation layer (S

). Investigation into electrochemical results further indicated that Mn

and visible light improved the electrochemical activity of chalcopyrite

thus increasing the bioleaching rate.

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⁰

Catalytic mechanism of manganese ions and visible light on chalcopyrite bioleaching in the presence of Acidithiobacillus ferrooxidans

DOI：

摘要

Abstract

关键词

Keywords

references