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SORPTION OF RHENIUM: RESEARCH, METHODS, AND SCIENTIFIC
APPROACHES
Dilyora Dilshod kizi Sherbutayeva,
Kholida Mumin kizi Azizova
student, associate Professor, PhD in Chemical Sciences
Almalyk branch of Tashkent State Technical University named after Islam Karimov
Abstract:
This article examines the sorption process of rhenium (Re) and its effective methods.
Due to the presence of perrhenate ions (ReO₄⁻) in industrial waste and the environment, which
pose ecological risks, their efficient removal is one of the key challenges. Various types of
sorbents, including activated carbon, ion-exchange sorbents, zeolites, and biomass-based
materials, are analyzed. The main mechanisms of the sorption process, such as electrostatic
forces, ion exchange, and Van der Waals interactions, are discussed. Furthermore, technologies
for rhenium recovery using modern nanomaterials and modified polymers are explored. This
review serves as a valuable source of information for research aimed at reducing rhenium's
environmental hazards and developing effective purification methods.
Keywords
: rhenium sorption, perrhenate ions, sorption methods, activated carbon, ion-exchange
sorbents, zeolites, biomass, environmental purification, bioaccumulation, nanomaterials.
Introduction
The effective removal of rhenium (ReO₄⁻) from the environment and industrial waste is an
essential aspect of ecological purification. Due to rhenium’s high toxicity and radioactive
properties, its presence in water and soil may pose serious threats to the environment and human
health. Several methods are available for removing rhenium; however, sorption—i.e., adsorption
of rhenium onto a solid phase—is considered one of the most effective and economically viable
technologies. This article reviews scientific research and principal approaches related to rhenium
sorption.
Environmental Impact and Sources of Rhenium
Rhenium is primarily known as a decay product of ruthenium (Ru) isotopes found in radioactive
materials or resulting from industrial processes. Its high toxicity and long environmental
persistence increase its ecological risk. Accumulation of rhenium in water or soil may lead to
uptake by plants, subsequent transfer to animals, and entry into the human food chain, thus
posing health risks. Therefore, effective removal of rhenium and its separation from the
environment is crucial.
Methods of Rhenium Removal
Several methods are used for the removal of rhenium, including:
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Chemical Reduction
: Rhenium can be removed by changing its oxidation state, e.g.,
reducing Re(VII) to Re(IV). This process helps convert rhenium to other chemical forms, though
its effectiveness can sometimes be limited.
Filtration and Distillation
: These techniques are employed to remove rhenium from
liquids but often involve high energy consumption and time.
Sorption
: The sorption method, in which rhenium is adsorbed onto a solid phase, is
widely used and considered the most promising approach for removing rhenium from water and
other solutions.
Sorbents and Their Properties
Various materials are used as sorbents for removing rhenium. Effective sorbents typically have
high surface areas and chemical structures that allow for efficient rhenium adsorption. The most
commonly used sorbents include:
Activated Carbon
: This material has excellent adsorption properties and is effective in
perrhenate (ReO₄⁻) sorption. Its high surface area and porous structure enhance its sorption
efficiency [1].
Zeolites
: Natural minerals with microstructures and high surface areas that allow for
effective rhenium adsorption. They are chemically stable and environmentally friendly materials
[2].
Ion-Exchange Sorbents
: Polymer-based sorbents, especially sulfonated polymers,
operate via ion exchange. These resins are effective in rhenium sorption as they serve as electron
donors and accommodate large ions [3].
Modified Biomass
: Biomass materials derived from soil or plants can be chemically
modified to efficiently adsorb rhenium. These materials are environmentally benign and cost-
effective [4].
Sorption Processes and Mechanisms
The sorption of rhenium is based on several physicochemical mechanisms, including:
Electrostatic Forces
: Ionic properties of the sorbent surface facilitate adsorption of
rhenium as an anion. Electrostatic attraction helps bind rhenium to the solid phase [5].
Ion Exchange
: In ion-exchange resins, rhenium anions are exchanged with other
positively charged ions, enhancing the process efficiency [6].
Van der Waals Forces
: These forces, arising from molecular interactions, support the
adsorption of rhenium onto the sorbent surface [7].
Recent Research and Innovations
Recent years have witnessed significant research aimed at improving rhenium sorption methods.
Notable innovations include:
Nanomaterials
: New types of nanomaterials developed through nanotechnology offer
high surface areas and unique structures for effective rhenium adsorption [8].
Modified Polymers
: Sorption processes using polymer resins and nanomaterials are
being optimized to enhance efficiency [9].
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Biomass-Based Sorbents
: Newly developed sorbents based on natural biomass are both
eco-friendly and low-cost, representing a growing research area [10].
Conclusion
There are various materials and methods available for the effective sorption of rhenium.
Activated carbon, zeolites, ion-exchange resins, and modified biomass materials are widely used
in this field. In recent years, the development of more efficient sorption technologies using
nanomaterials and polymers has gained momentum. To reduce the environmental risks of
rhenium and ensure its effective removal from ecosystems, further development of these
methods is essential.
References
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Removal of perrhenate from aqueous solutions by
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Benoit, J., & Schubert, T. (2015).
Perrhenate removal from aqueous solutions using
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Environmental Science & Technology, 49(22), 13556–
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Kim, H., & Lee, S. (2019).
Perrhenate adsorption on ion-exchange resins: A
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4.
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Adsorption of perrhenate from aqueous solutions using modified
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Effect of temperature and pH on perrhenate adsorption by
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Recent advances in the use of sorbents for rhenium and
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Азизова Холида Мумин Кизи, Катаев Нуритдин Тураевич, Бабаев Туйгун
Мирзаахмедович ИССЛЕДОВАНИЕ ВЗАИМОДЕЙСТВИЯ ИОНОВ МЕДИ (II) С
НОВЫМ КОМПЛЕКСООБРАЗУЮЩИМ АНИОНИТОМ // Universum: химия и биология.
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