Sorption of cobalt, chromium and uranium ions on Fe/Ti-pillared montmorillonite

Пилипенко, Ігор Володимирович; Спасьонова, Лариса Миколаївна; Ковальчук, Ірина Андріївна; Веремеєнко, Василь Валерійович

doi:10.15587/1729-4061.2014.26246

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…The authors of [17] proposed recommen-dations on the use of highly selective porous ceramic and glass crystalline materials to solve environmental tasks associated with water pool pollution by dangerous toxicants. The effectiveness of the use of powdered sorbents based on natural minerals for purification of water from HM and radionuclides with sorption [18] and sorption-coagulation methods [19] was confirmed. Variants of storage and disposal of absorbed substances were not investigated.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…The sediment of water purification, in addition to radionuclides and the most toxic heavy metals such as chromium, arsenic, cobalt, lead, also includes compounds of silicon, aluminum, iron, calcium, magnesium, potassium, sodium, zinc, nickel, etc. Paper [18] shows that due to its porous structure and highly developed surface, mineral sorbents have the ability to selectively remove various pollutants from aqueous solutions, and, given the absence of toxic effects, they can be used for water purification for both drinking needs and industrial use. Study [14] proved the advantage of natural adsorbents for the purification of aquatic media per size of the adsorption surface, compared to the surface of artificial adsorbents.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Devising technology for utilizing water treatment waste to produce ceramic building materials

Spasonova

Subota

Sholom

2021

EEJET

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Based on the modern ideas about environmental protection, this paper reports a study into the utilization of water-treated waste from heavy metals (using copper(II) compounds as an example) for the manufacture of ceramic building materials. The examined clay minerals from local deposits and the optimal conditions for their heat treatment (at 1,100 °C) have been proposed for the sorption removal of pollutants of inorganic origin from wastewater. The use of wastewater after its treatment makes it possible to address several tasks at the same time: to protect the environment from pollution by technological wastewater, as well as to reuse wastewater in order to resolve the issue of water scarcity. Ceramic building materials were manufactured based on water purification waste (in the amount of 5 %) and clay raw materials. Their structural-mechanical and physicochemical characteristics have been comprehensively studied. Sintering processes begin at lower temperatures, which is why, with an increase in the annealing temperature to 1,000 °C and higher, their strength rapidly decreases. In the temperature range of 600‒1,100 °C, there are possibilities to apply ceramic technology to immobilize heavy metals in ceramic matrices. The prospect of utilizing water purification waste in the technological process of manufacturing inorganic ceramic materials has been shown. The safety of the building materials, manufactured by leaching pollutants from the ceramic samples using various aggressive environments (leaching to 6.4 %, 0.083 mg·cm2/day) has been investigated. The high strength and degree of the copper ion fixation in the structure of polymineral clay have been confirmed while secondary environmental pollution is almost absent

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Devising technology for utilizing water treatment waste to produce ceramic building materials

Spasonova

Subota

Sholom

2021

EEJET

View full text Add to dashboard Cite

show abstract

“…In recent years, a promising direction is the use of composite materials due to their unique properties and increased sorption capacity [3,4].…”

Section: Introductionmentioning

confidence: 99%

Development of granular composites based on laponite and Zr/Fe-alginate for effective removal of uranium (VI) from sulfate solutions

Pylypenko,

Kovalchuk,

Tsyba

2023

EEJET

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The object of research is granular composites based on zirconium-iron alginates and laponite. The task of research is to determine the influence of the Zr:Fe ratio on the structure of granular composites and efficiency of uranium (VI) removal from aqueous solutions. The influence of the zirconium and iron ratio on the parameters of the material's pore structure has been established, particularly on the change in the content of micropores within the matrix. The specific surface area of the materials ranges from 86 to 112 m²/g. The sorption properties of the composites regarding uranium (VI) have been investigated. The impact of the charge of surface groups and the form of uranium (VI) presence in sulfate solutions on their sorption characteristics has been demonstrated. The maximum adsorption capacity reaches 265.1 µmol/g at pH 6. It is shown that an elevated electrolyte content positively affects the efficiency of uranium (VI) removal in neutral and alkaline medium. It has been established that structural changes in the materials occur due to the intensive interaction of iron ions and alginate molecules, resulting in the formation of a dense gel-like structure. The mechanism of uranium (VI) removal is associated with the formation of surface complexes in the presence of electrolytes. The synthesized granulated composites exhibit improved removal efficiency of uranium (VI) under conditions of high mineralization of solutions, making them attractive for potential use as sorbents. The obtained results can be utilized in the development of effective methods for purifying water environments from uranium (VI) in high mineralization conditions, which is a relevant issue in the field of nuclear energy and the removal of radioactive substances from water systems

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Removal of chromium (VI) from aqueous solutions by granular composites based on laponite and alginate ionotropically cross-linked by iron and zirconium ions

Pylypenko

2024

Vopr. Khim. Khim. Tekhnol.

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The conducted research established the porous structure of the materials through low-temperature nitrogen adsorption. It was demonstrated that the nitrogen sorption isotherms for the investigated samples belong to Type IV with H4 hysteresis associated with bottle-like pores. The specific surface area of the granulated composite samples was determined, ranging from 99 to 111 m2/g. Additionally, it was shown that an increase in iron content in the samples leads to a reduction in micropore content. Active centers on the material's surface, primarily composed of hydroxyl groups, were investigated using infrared spectroscopy. The kinetics of chromium (VI) adsorption were explored, and it was established that the iron-to-zirconium ratio in the reinforcement solutions hardly affects the duration of establishing adsorption equilibrium, which is approximately 60 minutes. Pseudo-first-order and pseudo-second-order models were applied to describe the kinetics of the adsorption process. The dependence of the chromium (VI) removal efficiency on the solution pH was determined. It was demonstrated that the synthesized samples exhibited high adsorption in acidic conditions with a sharp decline when transitioning to neutral and alkaline environments. It was shown that the maximum sorption capacities of the synthesized granulated composite samples significantly depend on the ratio of iron and zirconium ions. One of the most efficient samples is that with 50% Fe and 50% Zr, exhibiting a maximum sorption capacity of 13.29 mol/g at pH 6. The use of Langmuir and Freundlich models allowed establishing the fundamental adsorption properties of the materials.

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Sorption of cobalt, chromium and uranium ions on Fe/Ti-pillared montmorillonite

Cited by 3 publications

References 19 publications

Devising technology for utilizing water treatment waste to produce ceramic building materials

Devising technology for utilizing water treatment waste to produce ceramic building materials

Development of granular composites based on laponite and Zr/Fe-alginate for effective removal of uranium (VI) from sulfate solutions

Removal of chromium (VI) from aqueous solutions by granular composites based on laponite and alginate ionotropically cross-linked by iron and zirconium ions

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