Magnetic nanocomposites for sustainable water purification—a comprehensive review

Superparamagnetic Iron Oxide Nanoparticle Nanodevices Based on Fe3O4 Coated by Megluminic Ligands for the Adsorption of Metal Anions from Water

“…Especially, the application of superparamagnetic iron oxide nanoparticles (SPIONs) has been extensively studied to prepare a functional magnetic nanosorbent. 43 , 44 Recent works have proposed a series of the functionalized nanostructured materials in order to enhance the adsorption capacity and/or selectivity against specific pollutants by tuning their surface chemistry and physical properties. Alam et al have prepared Fe 3 O 4 @mSiO 2 -NH 2 magnetic core–shell amino adsorbents by a multistep sol–gel methodology able to uptake heavy metal cations such as Zn, Pb, and Cu, where the magnetic element was used similar to a support and the adsorbent phase was bonded onto a metal surface by click chemistry.…”

“…However, it was demonstrated that it also exhibited excellent sorption capability for other metal anions such as arsenic, chromium, antimuonium, and germanium, although in the presence of antagonist anions. ,, Regarding this topic, the employ of high-gradient magnetic separation-based technologies combined with the adsorption approach by the use of magnetic stimuli-responsive materials represents an efficient strategy to water treatment. ,− Moreover, in the recent years, proof of concept as well as prototype technologies, showed that magnetic nanosized metal oxide can be proficiently used for environmental purposes. ,− Indeed, by the application of external magnetic stimulus, the devices can be easily removed from the water, refreshed, and reused. Especially, the application of superparamagnetic iron oxide nanoparticles (SPIONs) has been extensively studied to prepare a functional magnetic nanosorbent. , Recent works have proposed a series of the functionalized nanostructured materials in order to enhance the adsorption capacity and/or selectivity against specific pollutants by tuning their surface chemistry and physical properties. Alam et al have prepared Fe 3 O 4 @mSiO 2 -NH 2 magnetic core–shell amino adsorbents by a multistep sol–gel methodology able to uptake heavy metal cations such as Zn, Pb, and Cu, where the magnetic element was used similar to a support and the adsorbent phase was bonded onto a metal surface by click chemistry …”

Century Impact of Macromolecules for Advances of Sensing Sciences

“…The polymer composite with magnetic properties was explored in the sensing application after exploring magneto rheological properties with targeted applications [ 39 , 40 ]. These polymer-based magnetic composite has been also explored for sensing magnetically active molecules as well as removal magnetic water pollutants like arsenic effectively [ 41 ]. Furthermore, the dual active polymer properties for the detection of the photon (light particle and magnetic force) are extensively explored by several scientists using polymer hybrid structures having photovoltaics and magnetic activities in their matrix.…”

Use of Nanoparticles in the Degradation of Contaminants in Aquatic Environments

“…As mentioned, enzymatic immobilization by nanoparticles is of great interest for nanobiotechnology in the treatment of contaminated wastewater, for this reason immobilizing the enzymes that participate in the degradation of textile dyes has been one of the main approaches. The removal of inorganic and organic dyes in wastewater has been achieved by the immobilization of the peroxidase enzyme on carbon-based nanoparticles; carbon nanoparticles can be carbon nanotubes, carbon nanosheets, and carbon nanoparticles, or metal-based nanoparticles, polymer-based magnetic nanoparticles, and zero-valence nanoparticles (Mehmood et al, 2021). Example of metalbased nanoparticles include iron oxide nanoparticles and their modified forms, such as maghemite nanoparticles, starch functionalized maghemite nanoparticles, magnetite nanoparticles, magnetite nanospheres and ethylenediamine functionalized nanochains, among others, which are used as supports for the immobilization of peroxidase.…”