The Effect of Vacuum Annealing of Magnetite and Zero-Valent Iron Nanoparticles on the Removal of Aqueous Uranium

As-formed and vacuum annealed zero-valent iron nanoparticles (nano-Fe0) and magnetite nanoparticles (nano-Fe3O4) were tested for the removal of uranium from carbonate-rich mine water. Nanoparticles were introduced to batch systems containing the mine water under oxygen conditions representative of near-surface waters, with a uranyl solution studied as a simple comparator system. Despite the vacuum annealed nano-Fe0having a 64.6% lower surface area than the standard nano-Fe0, similar U removal (>98%) was recorded during the initial stages of reaction with the mine water. In contrast, ≤15% U removal was recorded for the mine water treated with both as-formed and vacuum annealed nano-Fe3O4. Over extended reaction periods (>1 week), appreciable U rerelease was recorded for the mine water solutions treated using nano-Fe0, whilst the vacuum annealed material maintained U at <50 μg L−1until 4 weeks reaction. XPS analysis of reacted nanoparticulate solids confirmed the partial chemical reduction ofUVItoUIVin both nano-Fe0water treatment systems, but with a greater amount ofUIVdetected on the vacuum annealed particles. Results suggest that vacuum annealing can enhance the aqueous reactivity of nano-Fe0and, for waters of complex chemistry, can improve the longevity of aqueous U removal.

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Zero-valent iron nanoparticles in treatment of acid mine water from in situ uranium leaching

Chemosphere ◽

10.1016/j.chemosphere.2010.11.075 ◽

2011 ◽

Vol 82 (8) ◽

pp. 1178-1184 ◽

Cited By ~ 134

Author(s):

Stepanka Klimkova ◽

Miroslav Cernik ◽

Lenka Lacinova ◽

Jan Filip ◽

Dalibor Jancik ◽

...

Keyword(s):

Mine Water ◽

Iron Nanoparticles ◽

Zero Valent Iron ◽

Acid Mine Water ◽

Uranium Leaching ◽

Acid Mine ◽

Zero Valent Iron Nanoparticles

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Production and Application of Zero Valent Iron Nanoparticles (nZVI) as Adsorbent for Removal of Chromium (VI) From Wastewater and Adsorption Studies

Proceedings of the Water Environment Federation ◽

10.2175/193864718825138989 ◽

2018 ◽

Vol 2018 (7) ◽

pp. 4988-5003

Author(s):

Fisseha Andualem Bezza ◽

Evans M. Nkhalambayausi Chirwa

Keyword(s):

Iron Nanoparticles ◽

Zero Valent Iron ◽

Adsorption Studies ◽

Chromium Vi ◽

Zero Valent Iron Nanoparticles

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Zero-Valent Iron Nanoparticles for Soil and Groundwater Remediation

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17165817 ◽

2020 ◽

Vol 17 (16) ◽

pp. 5817

Author(s):

Alazne Galdames ◽

Leire Ruiz-Rubio ◽

Maider Orueta ◽

Miguel Sánchez-Arzalluz ◽

José Luis Vilas-Vilela

Keyword(s):

Contaminated Soils ◽

Groundwater Remediation ◽

Iron Nanoparticles ◽

Environmental Issues ◽

High Specific Surface Area ◽

Zero Valent Iron ◽

Pilot Studies ◽

High Effectiveness ◽

Nanosized Materials ◽

Zero Valent Iron Nanoparticles

Zero-valent iron has been reported as a successful remediation agent for environmental issues, being extensively used in soil and groundwater remediation. The use of zero-valent nanoparticles have been arisen as a highly effective method due to the high specific surface area of zero-valent nanoparticles. Then, the development of nanosized materials in general, and the improvement of the properties of the nano-iron in particular, has facilitated their application in remediation technologies. As the result, highly efficient and versatile nanomaterials have been obtained. Among the possible nanoparticle systems, the reactivity and availability of zero-valent iron nanoparticles (NZVI) have achieved very interesting and promising results make them particularly attractive for the remediation of subsurface contaminants. In fact, a large number of laboratory and pilot studies have reported the high effectiveness of these NZVI-based technologies for the remediation of groundwater and contaminated soils. Although the results are often based on a limited contaminant target, there is a large gap between the amount of contaminants tested with NZVI at the laboratory level and those remediated at the pilot and field level. In this review, the main zero-valent iron nanoparticles and their remediation capacity are summarized, in addition to the pilot and land scale studies reported until date for each kind of nanomaterials.

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