Stabilization and encapsulation of arsenic-/antimony-bearing mine waste: Overview and outlook of existing techniques

Álvarez‐Ayuso, E.

doi:10.1080/10643389.2021.1944588

Cited by 21 publications

(7 citation statements)

References 126 publications

(323 reference statements)

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“…3 Remediation of As-contaminated soil and water is necessary to ensure the safety of agricultural products and human health. 4 Over the past 20 years, much research focused on phytoremediation of As-contaminated soils using P. vittata. 5,6 This is because P. vittata is efficient in taking up As from Ascontaminated soils, with the highest As contents reaching 2.3% in its biomass.…”

Section: ■ Introductionmentioning

confidence: 99%

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Selenium Increased Arsenic Accumulation by Upregulating the Expression of Genes Responsible for Arsenic Reduction, Translocation, and Sequestration in Arsenic Hyperaccumulator Pteris vittata

Dai

Peng

Ding

et al. 2022

Environ. Sci. Technol.

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Selenate enhances arsenic (As) accumulation in Ashyperaccumulator Pteris vittata, but the associated molecular mechanisms are unclear. Here, we investigated the mechanisms of selenate-induced arsenic accumulation by exposing P. vittata to 50 μM arsenate (AsV 50 ) and 1.25 (Se 1.25 ) or 5 μM (Se 5 ) selenate in hydroponics. After 2 weeks, plant biomass, plant As and Se contents, As speciation in plant and growth media, and important genes related to As detoxification in P. vittata were determined. These genes included P transporters PvPht1;3 and PvPht1;4 (AsV uptake), arsenate reductases PvHAC1 and PvHAC2 (AsV reduction), and arsenite (AsIII) antiporters PvACR3 and PvACR3;2 (AsIII translocation) in the roots, and AsIII antiporters PvACR3;1 and PvACR3;3 (AsIII sequestration) in the fronds. The results show that Se 1.25 was more effective than Se 5 in increasing As accumulation in both P. vittata roots and fronds, which increased by 27 and 153% to 353 and 506 mg kg −1 . The As speciation analyses show that selenate increased the AsIII levels in P. vittata, with 124−282% more AsIII being translocated into the fronds. The qPCR analyses indicate that Se 1.25 upregulated the gene expression of PvHAC1 by 1.2-fold, and PvACR3 and PvACR3;2 by 1.0-to 2.5-fold in the roots, and PvACR3;1 and PvACR3;3 by 0.6-to 1.1-fold in the fronds under AsV 50 treatment. Though arsenate enhanced gene expression of P transporters PvPht1;3 and PvPht1;4, selenate had little effect. Our results indicate that selenate effectively increased As accumulation in P. vittata, mostly by increasing reduction of AsV to AsIII in the roots, AsIII translocation from the roots to fronds, and AsIII sequestration into the vacuoles in the fronds. The results suggest that selenate may be used to enhance phytoremediation of As-contaminated soils using P. vittata.

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Section: ■ Introductionmentioning

confidence: 99%

“…AsV predominates in aerobic soils and is the major form for plant uptake, including As-hyperaccumulator Pteris vittata . Remediation of As-contaminated soil and water is necessary to ensure the safety of agricultural products and human health …”

Section: Introductionmentioning

confidence: 99%

Selenium Increased Arsenic Accumulation by Upregulating the Expression of Genes Responsible for Arsenic Reduction, Translocation, and Sequestration in Arsenic Hyperaccumulator Pteris vittata

Dai

Peng

Ding

et al. 2022

Environ. Sci. Technol.

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“…Furthermore, synthetic inorganic compounds could be used as well in host matrices. A recent development for the immobilization of PHEs is encapsulation technology [85,86], a method in which a PHE in the form of either small particles or larger chunks is isolated within an inert compound with a high structural integrity. This minimizes the surface area of the hazardous waste exposed to water in the environment, so that the dissolution of the hazardous element is minimized as well.…”

Section: Principle 6: Safely Dispose Of Potentially Harmful Elementsmentioning

confidence: 99%

The Twelve Principles of Circular Hydrometallurgy

Binnemans

Jones

2022

J. Sustain. Metall.

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In this academic position paper, we propose the 12 Principles of a novel and more sustainable approach to hydrometallurgy that we call “circular hydrometallurgy.” The paper intends to set a basis for identifying future areas of research in the field of hydrometallurgy, while providing a “sustainability” benchmark for assessing existing processes and technological developments. Circular hydrometallurgy refers to the designing of energy-efficient and resource-efficient flowsheets or unit processes that consume the minimum quantities of reagents and result in minimum waste. The application of a circular approach involves new ways of thinking about how hydrometallurgy is applied for both primary and secondary resources. In either case, the emphasis must be on the regeneration and reuse of every reagent in the process. This refers not only to the acids and bases employed for leaching or pH control, but also any reducing agents, oxidizing agents, and other auxiliary reagents. Likewise, the consumption of water and energy must be reduced to an absolute minimum. To consolidate the concept of circular hydrometallurgical flowsheets, we present the 12 Principles that will boost sustainability: (1) regenerate reagents, (2) close water loops, (3) prevent waste, (4) maximize mass, energy, space, and time efficiency, (5) integrate materials and energy flows, (6) safely dispose of potentially harmful elements, (7) decrease activation energy, (8) electrify processes wherever possible, (9) use benign chemicals, (10) reduce chemical diversity, (11) implement real-time analysis and digital process control, and (12) combine circular hydrometallurgy with zero-waste mining. Although we realize that the choice of these principles is somewhat arbitrary and that other principles could be imagined or some principles could be merged, we are nevertheless convinced that the present framework of these 12 Principles, as put forward in this position paper, provides a powerful tool to show the direction of future research and innovation in hydrometallurgy, both in industry and in academia. Graphical Abstract

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“…1,12,13 Recent advances suggest that Fe (hydr) oxide is one of the most effective sequestering agents controlling the immobilization of Sb in Sb-polluted sites. 14 For example, Sb(V) secluded by ferrihydrite (FH) is structurally incorporated into goethite and/or hematite generated by FH transformation. 15 The high Sb loading (Sb : Fe(III) = 0.08) could result in the substantial formation of feroxyhyte, accompanied by the decrease of goethite formation under Fe(II)-catalyzed anoxic conditions.…”

Section: Introductionmentioning

confidence: 99%

Co-transport of ferrihydrite–organic matter colloids with Sb(v) in saturated porous media: implications for antimony mobility

Mao,

Wang,

et al. 2024

Environ. Sci.: Nano

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Stabilization and encapsulation of arsenic-/antimony-bearing mine waste: Overview and outlook of existing techniques

Cited by 21 publications

References 126 publications

Selenium Increased Arsenic Accumulation by Upregulating the Expression of Genes Responsible for Arsenic Reduction, Translocation, and Sequestration in Arsenic Hyperaccumulator Pteris vittata

Selenium Increased Arsenic Accumulation by Upregulating the Expression of Genes Responsible for Arsenic Reduction, Translocation, and Sequestration in Arsenic Hyperaccumulator Pteris vittata

The Twelve Principles of Circular Hydrometallurgy

Co-transport of ferrihydrite–organic matter colloids with Sb(v) in saturated porous media: implications for antimony mobility

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