Non-linear hydroxyl radical formation rate in dispersions containing mixtures of pyrite and chalcopyrite particles

Kaur, Jasmeet; Schoonen, Martin A. A.

doi:10.1016/j.gca.2017.03.011

Cited by 20 publications

(4 citation statements)

References 62 publications

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“…On the other hand, this heterogeneous catalyst can be further reutilized. According to previous research, persistent organic pollutants (i.e., sulfamethazine, trichloroethylene, and 1,4-dioxane) can be degraded by hydroxyl radicals produced during Fenton reactions. ,, …”

Section: Characteristics and Application Of Pyrite In Wastewater Trea...mentioning

confidence: 99%

How Pyrite Interacts with Anammox: Mechanisms and Application

Feng

Liu

et al. 2022

ACS EST Water

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Anaerobic ammonium oxidation (Anammox) is a promising biotechnology involving the nitrogen removal process owing to its benefits, such as high efficiency and low cost. However, problems are faced during its application, including long cell doubling time, sensitivity to environmental factors, and generation of nitrate as a byproduct. With the ability to promote bacterial growth and reduce the nitrate byproduct, pyrite (FeS2) has remarkable potential in enhancing the Anammox process. It will also expand the nitrogen removal pathway by coupling with the iron–nitrogen–sulfur cycle. Few pioneering studies on using pyrite for Anammox enhancement have been published recently, and critical information has yet to be summarized. This Review provides a comprehensive and systematic overview of the role of pyrite in the Anammox process. It offers the possibility of coupling pyrite with Anammox to achieve a more efficient nitrogen removal.

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Section: Characteristics and Application Of Pyrite In Wastewater Trea...mentioning

confidence: 99%

How Pyrite Interacts with Anammox: Mechanisms and Application

Feng

Liu

et al. 2022

ACS EST Water

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“…Ke et al [9] demonstrated that there is a galvanic interaction between the grinding media and the sulfide minerals because of the semiconducting nature of the sulfide minerals. During grinding, electrons will be transferred from the active material with a lower rest potential to the noble material with a higher rest potential [10]. The rest potential of common iron-based grinding media is generally lower than that of common sulfide minerals (pyrite, chalcopyrite, galena, and sphalerite, etc.)…”

Section: Introductionmentioning

confidence: 99%

Changing the Pulp Properties and Surface Hydrophilicity of Galena and Pyrite by Selecting the Appropriate Grinding Media Towards Their Selective Separation

Zhai,

Liu,

et al. 2023

Minerals

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The grinding process plays a crucial role in the floatability of mineral. The present study proposes a scheme to assist in the flotation separation of galena and pyrite by optimizing the choice of grinding media. The effects of grinding media (cast iron balls, steel balls containing 18% chromium, and steel balls containing 12% chromium) on the pulp properties and hydrophilicity of galena and pyrite were evaluated using grinding tests, micro-flotation tests, X-ray photoelectron spectroscopy, and adsorption capacity analyses. The results showed significant differences in the pH, potential, and dissolved oxygen content of the galena or pyrite pulp with different grinding media, resulting in significant differences in the flotation behavior of galena and pyrite. The use of cast iron balls in the grinding process was more favorable for the flotation separation of galena and pyrite. The pyrite surfaces adsorbed less butyl xanthate when cast iron balls were used as grinding media due to the presence of more hydrophilic hydroxyl iron. Therefore, cast iron balls as grinding media are favorable for broadening the surface hydrophilic differences between galena and pyrite.

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“…In natural environments, microorganisms are commonly exposed to oxidative stresses ( Cooper et al, 1988 ; Mopper and Zhou, 1990 ; Hakkinen et al, 2004 ; Kaur and Schoonen, 2017 ) in which a variety of substances (e.g., pyrite, manganese oxides, and pyrithione) spontaneously react with molecular oxygen to produce H 2 O 2 ( Borda et al, 2001 ; Schoonen et al, 2010 ; Kong et al, 2015 ), especially with the mediation of light ( Mopper and Zhou, 1990 ; Zuo and Deng, 1999 ) and organic substances ( Zuo and Hoigne, 1993 ). In this study, the effects of H 2 O 2 and Mn 2+ ion on growth, Mn 2+ acquisition, anti-oxidative system and biofilm formation by P. putida MnB1 were assayed.…”

Section: Introductionmentioning

confidence: 99%

bifA Regulates Biofilm Development of Pseudomonas putida MnB1 as a Primary Response to H2O2 and Mn2+

Zheng

Long

et al. 2018

Front. Microbiol.

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Pseudomonas putida (P. putida) MnB1 is a widely used model strain in environment science and technology for determining microbial manganese oxidation. Numerous studies have demonstrated that the growth and metabolism of P. putida MnB1 are influenced by various environmental factors. In this study, we investigated the effects of hydrogen peroxide (H2O2) and manganese (Mn2+) on proliferation, Mn2+ acquisition, anti-oxidative system, and biofilm formation of P. putida MnB1. The related orthologs of 4 genes, mco, mntABC, sod, and bifA, were amplified from P. putida GB1 and their involvement were assayed, respectively. We found that P. putida MnB1 degraded H2O2, and quickly recovered for proliferation, but its intracellular oxidative stress state was maintained, with rapid biofilm formation after H2O2 depletion. The data from mco, mntABC, sod and bifA expression levels by qRT-PCR, elucidated a sensitivity toward bifA-mediated biofilm formation, in contrary to intracellular anti-oxidative system under H2O2 exposure. Meanwhile, Mn2+ ion supply inhibited biofilm formation of P. putida MnB1. The expression pattern of these genes showed that Mn2+ ion supply likely functioned to modulate biofilm formation rather than only acting as nutrient substrate for P. putida MnB1. Furthermore, blockade of BifA activity by GTP increased the formation and development of biofilms during H2O2 exposure, while converse response to Mn2+ ion supply was evident. These distinct cellular responses to H2O2 and Mn2+ provide insights on the common mechanism by which environmental microorganisms may be protected from exogenous factors. We postulate that BifA-mediated biofilm formation but not intracellular anti-oxidative system may be a primary protective strategy adopted by P. putida MnB1. These findings will highlight the understanding of microbial adaptation mechanisms to distinct environmental stresses.

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Non-linear hydroxyl radical formation rate in dispersions containing mixtures of pyrite and chalcopyrite particles

Cited by 20 publications

References 62 publications

How Pyrite Interacts with Anammox: Mechanisms and Application

How Pyrite Interacts with Anammox: Mechanisms and Application

Changing the Pulp Properties and Surface Hydrophilicity of Galena and Pyrite by Selecting the Appropriate Grinding Media Towards Their Selective Separation

bifA Regulates Biofilm Development of Pseudomonas putida MnB1 as a Primary Response to H2O2 and Mn2+

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