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Toxics
Special Issues
Ecological Restoration and Treatment of Metal Contamination from Mines
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Ecological Restoration and Treatment of Metal Contamination from Mines

A special issue of Toxics (ISSN 2305-6304). This special issue belongs to the section "Toxicity Reduction and Environmental Remediation".

Deadline for manuscript submissions: 23 May 2025 | Viewed by 984

Special Issue Editors

Dr. Liang Hu

E-Mail Website
Guest Editor
School of Minerals Processing and Bioengineering, Central South University, Changsha, China
Interests: environmental microbial technology; heavy metals removal; environmental remediation
Special Issues, Collections and Topics in MDPI journals
Dr. Luhua Jiang

E-Mail Website
Guest Editor
School of Minerals Processing and Bioengineering, Central South University, Changsha, China
Interests: microbial–mineral interaction; mine restoration; paddy soil bioremediation; metal(loid) transformation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The mining of metal has led to a series of environmental problems, such as soil and water pollution caused by heavy metals and rare earth elements. An integrated approach to the ecological restoration of mines has the potential to make a significant contribution to the world's environmental sustainability, carbon neutrality and social equity. Researchers are trying to exploit the integrated methods for pollution removal and carbon reduction. It is expected that the dual carbon target associated with mine remediation can be concurrently achieved by improving the environment, thus reducing the ecological risks of toxic metal elements. This Special Issue aims to receive submissions of high-quality, original and previously unpublished research on the fundamental theory and engineering practice of ecological restoration and treatment of metal mines, including, but not limited to, the following topics:

  • Biogeochemical processes of metal elements, including migration, transformation, fate, oxidation and reduction;
  • Advanced methods of ecological restoration and treatment of metal mines (targeting, persistence and mechanisms);
  • Relevant policies, regulations and terms.

Dr. Liang Hu
Dr. Luhua Jiang
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Toxics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • heavy metal
  • rare earth
  • migration and transformation
  • occurrence state
  • stabilization
  • carbon sequestration
  • environmental risk
  • ecological restoration
  • microbial technology

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Published Papers (1 paper)

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Research

23 pages, 5459 KiB  
Article
The Effect of Cysteine on the Removal of Cadmium in Paddy Soil by Combination with Bioremediation and the Response of the Soil Microbial Community
by Emmanuel Konadu Sarkodie, Kewei Li, Ziwen Guo, Jiejie Yang, Yan Deng, Jiaxin Shi, Yulong Peng, Yuli Jiang, Huidan Jiang, Hongwei Liu, Yili Liang, Huaqun Yin, Xueduan Liu and Luhua Jiang
Toxics 2025, 13(1), 22; https://doi.org/10.3390/toxics13010022 - 29 Dec 2024
Viewed by 825
Abstract
Bioremediation is widely recognized as a promising and efficient approach for the elimination of Cd from contaminated paddy soils. However, the Cd removal efficacy achieved through this method remains unsatisfactory and is accompanied by a marginally higher cost. Cysteine has the potential to [...] Read more.
Bioremediation is widely recognized as a promising and efficient approach for the elimination of Cd from contaminated paddy soils. However, the Cd removal efficacy achieved through this method remains unsatisfactory and is accompanied by a marginally higher cost. Cysteine has the potential to improve the bioleaching efficiency of Cd from soils and decrease the use cost since it is green, acidic and has a high Cd affinity. In this study, different combination modes of cysteine and microbial inoculant were designed to analyze their effects on Cd removal and the soil microbial community through the sequence extraction of Cd fraction and high-throughput sequencing. The results demonstrate that the mixture of cysteine and the microbial inoculant was the best mode for increasing the Cd removal efficiency. And a ratio of cysteine to microbial inoculant of 5 mg:2 mL in a 300 mL volume was the most economically efficient matching. The Cd removal rate increased by 7.7–15.1% in comparison with the microbial inoculant treatment. This could be ascribed to the enhanced removal rate of the exchangeable and carbonate-bound Cd, which achieved 94.6% and 96.1%, respectively. After the treatment, the contents of ammonium nitrogen (NH3–N), total phosphorus (TP), available potassium (AK), and available phosphorus (AP) in the paddy soils were increased. The treatment of combinations of cysteine and microbial inoculant had an impact on the soil microbial diversity. The relative abundances of Alicyclobacillus, Metallibacterium, and Bacillus were increased in the paddy soils. The microbial metabolic functions, such as replication and repair and amino acid metabolism, were also increased after treatment, which benefitted the microbial survival and adaptation to the environment. The removal of Cd was attributed to the solubilizing, complexing, and ion-exchanging effects of the cysteine, the intra- and extracellular adsorption, and the production of organic acids of functional microorganisms. Moreover, cysteine, as a carbon, nitrogen, and sulfur source, promoted the growth and metabolism of microorganisms to achieve the effect of the synergistic promotion of microbial Cd removal. Therefore, this study underscored the potential of cysteine to enhance the bioremediation performance in Cd-contaminated paddy soils, offering valuable theoretical and technical insights for this field. Full article
(This article belongs to the Special Issue Ecological Restoration and Treatment of Metal Contamination from Mines)
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