Synthesis and sorption properties of composite materials based on nanoscale Fe0

Тобілко, Вікторія Юріївна; Корнілович, Борис Юрійович

doi:10.15587/1729-4061.2015.46580

Cited by 7 publications

(2 citation statements)

References 9 publications

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“…Відомо, що композити з іммобілізованими на поверхні дисперсних матриць наночастинками НВЗ мають досить високі сорбційні властивості щодо іонів деяких важливих токсикантів: кобальту та міді [20,21], арсену [22], урану [23], хрому [24,25]. Однак є тільки окремі роботи, присвячені фізико-хімічному обґрунтуванню процесів очищення стічних вод, які містять складну суміш іонів важких металів (див., наприклад, [26]).…”

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“…Після цього отриманий композиційний сорбент відділяли від рідкої фази центрифугу ванням і тричі промивали етиловим спиртом. Одержаний осад висушували під вакуумом за температури 60 °C і подрібнювали до отримання фракції ≤ 0,2 мм [25]. Вміст заліза в отриманих зразках після вилуговування азотною кислотою за даними хімічного аналізу становив 0,17 г на 1 г ПГ.…”

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REMOVAL OF Cu(II), Cd(II), Co(II), Zn(II), Cr(VI) FROM WASTEWATER BY STABILIZED NANOSCALE ZERO-VALENT IRON

Kholodko¹,

Бондарєва²,

Тобілко³

et al. 2021

KPI SN

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Background. Obtaining sorption materials based on natural raw materials for water purification from pollution by heavy metal ions is an urgent task of our time. Composites with zero-valent iron nanoparticles immobilized on the surface of clay minerals show rather high sorption properties concerning ions of some heavy metals. However, there are only a few proceedings devoted to the physicochemical substantiation of wastewater treatment processes containing a complex mixture of such pollutants. Objective. The purpose of the paper is to study the physicochemical regularities of wastewater treatment from a mixture of ions of heavy metals Cu(II), Cd(II), Co(II), Zn(II), Cr(VI) using stabilized nano dispersed powders of zero-valent iron. Methods. The phase composition and structural-sorption characteristics of palygorskite and composites were studied by X-ray phase analysis and low-temperature adsorption-desorption of nitrogen. The efficiency of removal of metal ions by silicate materials was investigated using the sorption method. The equilibrium concentrations of each of the metals were determined by inductively coupled plasma atomic emission spectrometry. Results. We have investigated the physicochemical features of wastewater treatment containing a complex mixture of heavy metal ions (Cu(II), Cd(II), Zn(II), Co(II), Cr(VI)). The phase composition and structural-sorption properties of stabilized nano dispersed powders of zero-valent iron have been studied. It has been experimentally confirmed that the materials obtained have significantly better sorption properties for the removal of heavy metals from aqueous solutions in comparison with natural palygorskite. Using Freundlich and Langmuir equations sorption isotherms were calculated. Conclusions. It has been established that stabilized nano dispersed powders of zero-valent iron can be successfully used for the purification of wastewater containing a mixture of toxic ions Cu(II), Cd(II), Co(II), Zn(II) and Cr(VI). It is shown that the degree of water purification by the obtained sorbents is 3–5 times higher than that for the unmodified mineral. A significant increase in the values of sorption of anionic forms of Cr(VI), which are difficult to remove from polluted waters by natural ion exchangers, has been determined.

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REMOVAL OF Cu(II), Cd(II), Co(II), Zn(II), Cr(VI) FROM WASTEWATER BY STABILIZED NANOSCALE ZERO-VALENT IRON

Kholodko¹,

Бондарєва²,

Тобілко³

et al. 2021

KPI SN

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Adsorption removal of heavy metal ions from multi-component aqueous system by clay-supported nanoscale zero-valent iron

Kovalchuk

Kornilovych

Тобілко

et al. 2022

Journal of Dispersion Science and Technology

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Selective sorption of heavy metals and radionuclides by natural and modified layered silicates

Kornilovych,

Kovalchuk

2024

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Traditionally, natural layered silicates – clay minerals – are widely used in various environmental protection technologies. However, they have significant drawbacks, the most important of which is insufficient sorption capacity, especially for anionic forms of pollutants. To increase the effectiveness of layered silicates, various methods of surface modification using surfactants, intercalation of complex cations in the interlayer space of minerals of the smectite group, application of nanoparticles of active metals to the surface, etc. are carried out. The use of these methods makes it possible to significantly increase the sorption properties of modified dispersed minerals, as well as to significantly expand the scope of their possible application in environmental protection technologies. The monograph is devoted to the development based on the evolution of physical-chemical ideas about the mechanism of sorption processes of the system approach to purposeful regulation of sorption properties of layered silicates at their modification for removal of heavy metal compounds and radionuclides. Highly selective sorption materials based on layered silicates were obtained. This was achieved through detailed physicochemical substantiation of the structure of active sorption centers on the surface of layered silicates with analysis of the porous structure of the obtained sorbents and determination of the mechanism of sorption processes for heavy metals and radionuclides. It has been shown that surface modification of layered silicates using cationic surfactants allows effective sorption of toxicants in their anionic forms (compounds of chromium and uranium) on the surface. The obtained pillared minerals have significantly increased selectivity. The developed composite sorbents based on nano-sized particles of zero-valent iron and dispersed minerals are highly reactive materials to heavy metals and radionuclides in both cationic and anionic forms. Successful purposeful regulation of the surface properties of layered silicates made it possible to expand the scope of application of new sorption materials for the treatment of surface, underground, and wastewater of various types, contaminated with compounds of heavy metals and radionuclides. The monograph presents the results of the practical use of zero-valent iron to remove uranium compounds from contaminated groundwater. Its effectiveness as reactive treatment media in permeable reactive barriers built near the uranium ore processing tailings in Zhovti Vody city has been proven.The monograph is intended for specialists in the field of physical, colloidal chemistry, radiochemistry, and ecology, and will also be useful for lecturers and students of universities specializing in chemical and environmental departments.

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Synthesis and sorption properties of composite materials based on nanoscale Fe0

Cited by 7 publications

References 9 publications

REMOVAL OF Cu(II), Cd(II), Co(II), Zn(II), Cr(VI) FROM WASTEWATER BY STABILIZED NANOSCALE ZERO-VALENT IRON

REMOVAL OF Cu(II), Cd(II), Co(II), Zn(II), Cr(VI) FROM WASTEWATER BY STABILIZED NANOSCALE ZERO-VALENT IRON

Adsorption removal of heavy metal ions from multi-component aqueous system by clay-supported nanoscale zero-valent iron

Selective sorption of heavy metals and radionuclides by natural and modified layered silicates

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