Distilling off Hydrofluoric Acid from Acid Fluoride-Sulphate Solutions

The Ferrozinen assay is applied as an accurate and rapid method to quantify the iron content of iron oxide nanoparticles (IONPs) and can be used in biological matrices. The addition of ascorbic aqcid accelerates the digestion process and can penetrate an IONP core within a mesoporous and solid silica shell. This new digestion protocol avoids the need for hydrofluoric acid to digest the surrounding silica shell and provides and accessible alternative to inductively coupled plasma methods. With the updated digestion protocol, the quantitative range of the Ferrozine assay is 1 - 14 ppm. <br>

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Ferrozine Assay for Simple and Cheap Iron Analysis of Silica-Coated Iron Oxide Nanoparticles

10.26434/chemrxiv.6815672 ◽

2018 ◽

Author(s):

Hattie Ring ◽

Zhe Gao ◽

Nathan D. Klein ◽

Michael Garwood ◽

John C. Bischof ◽

...

Keyword(s):

Iron Oxide ◽

Iron Oxide Nanoparticles ◽

Hydrofluoric Acid ◽

Inductively Coupled Plasma ◽

Silica Shell ◽

Oxide Nanoparticles ◽

Inductively Coupled ◽

Digestion Process ◽

Plasma Methods ◽

Iron Analysis

The Ferrozinen assay is applied as an accurate and rapid method to quantify the iron content of iron oxide nanoparticles (IONPs) and can be used in biological matrices. The addition of ascorbic aqcid accelerates the digestion process and can penetrate an IONP core within a mesoporous and solid silica shell. This new digestion protocol avoids the need for hydrofluoric acid to digest the surrounding silica shell and provides and accessible alternative to inductively coupled plasma methods. With the updated digestion protocol, the quantitative range of the Ferrozine assay is 1 - 14 ppm. <br>

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Rapid, Non-Toxic Synthesis of Beta Zeolites

10.26434/chemrxiv.6432155 ◽

2018 ◽

Author(s):

Felix Hemmann ◽

Jonathan Hackebeil ◽

Andreas Lißner ◽

Florian Mertens

Keyword(s):

Hydrofluoric Acid ◽

Molecular Sieves ◽

Toxic Chemicals ◽

Lewis Acidity ◽

Beta Zeolite ◽

Seeded Growth ◽

Related Research ◽

Beta Zeolites ◽

Growth Method ◽

Fast Synthesis

Molecular sieves with beta zeolite topology are promising catalysts for various reactions as they exhibits extraordinary Lewis acidity. However, their industrial application and related research in academica is hindered because their synthesis is time consuming and typically involves toxic chemicals as hydrofluoric acid. Therefore, tetraethylammonium fluorid was tested as a non-toxic fluotide source for the synthesis of beta zeolites. In combination with the previously reported nano-seeded growth method, a fast synthesis of beta zeolites only involving non-toxic chemicals was possible. Synthesized zeolites show comparable selectivity in the Bayer-Villinger oxidation as conventional zeolites synthesized with hydrofluoric acid.<br>

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