Functionalized magnetic nanoparticles as chemosensors and adsorbents for toxic metal ions in environmental and biological fields

Abstract

Functionalized magnetic nanoparticles, composed of both inorganic and organic components, have recently been examined as promising platforms for detection and separation applications. This unique class of nanomaterials can retain not only beneficial features of both the inorganic and organic components, but can also provide the ability to systematically tune the properties of the hybrid materials through the combination of appropriate functional components. This tutorial review focuses on the recent development of functionalized magnetic nanoparticles for use in biological and environmental applications, in which these chromogenic and fluorogenic chemosensors can selectively detect and separate specific toxic metal ions.

The study of magnetic properties and relaxation processes in Co/Au bimetallic nanoparticles

“…Its unique properties are suitable for numerous applications. Their introduction in medicine (cancer diagnosing [1], cancer treating [2], drug delivery [3]) or environmental science [4] posed new trends and challenges in these fields for the incoming 21st century. Therefore, the understanding of processes and phenomena present in the magnetic nanoparticle systems is crucial.…”

Combination of carboxymethyl chitosan-coated magnetic nanoparticles and chitosan-citrate complex gel beads as a novel magnetic adsorbent

“…Magnetic adsorbents after adsorbing contaminants can be separated from a solution by using an external magnetic field (Ge, Li, Ye, & Zhao, 2012;Jung, Lee, & Shinkai, 2011;Tang, Su, Li, Gao, & Shang, 2013). Therefore, magnetite (Fe 3 O 4 ) is considered a promising magnetic material because it possesses a large surface area and excellent magnetic properties.…”

Analyte-induced photoreduction method for visual and colorimetric detection of tyrosine

“…Any change of dispersion or aggregation state of the metal nanoparticles by the target analyte can cause a shift of the SPR band position, and consequently a change of solution color can be obtained and used in the quantification. Several methods have been proposed to utilize this behavior for detection of a wide variety of analytes, commonly categorized as aggregation [1][2][3], anti-aggregation colorimetric method [4][5][6], and nonaggregation methods [7][8][9]. In general, aggregation of metal nanoparticles after the interaction with analyte results in a red shifting of SPR band with an increase in intensity, which gives a noticeable change of solution color.…”