Efficient Cr(VI) removal from wastewater by activated carbon superparamagnetic composites

Phosphotungstic acid impregnated niobium coated superparamagnetic iron oxide nanoparticles as recyclable catalyst for selective isomerization of terpenes

“…The nal magnetization however is large enough to induce efficient magnetic precipitation/separation of the catalyst. 27,33 TEM images of the SPION precursor and the corresponding SPION-Nb30 are shown in Fig. 2.…”

“… 13–16 Among them, magnetite (Fe 3 O 4 ) and maghemite (γ-Fe 2 O 3 ) 17,18 nanoparticles are been considered promising candidates since they are inexpensive, chemically stable, easy to prepare, and may be recovered by using an external magnetic field. In addition, magnetic nanoparticles are known for applications in several areas, such as drug delivery systems, 19–21 targeted gene therapy, 22–24 magnetic resonance imaging (MRI), 25 sensors, 26 separation and environmental remediation processes, 27 nanomedicine 28–30 and catalysis, 31–33 additive of synthetic base oil, 34 analytical chemistry using the SERS effect, 35,36 among others.…”

Functionalization of magnetic chitosan microparticles for high-performance removal of chromate from aqueous solutions and tannery effluent

“…Solvent-based extraction was also used directly for the recovery and the separation of chromate anions [7], but also through the impregnation of porous resins (solvent-impregnated resins [8]), or using supported hollow fiber systems [9]. Many studies have demonstrated the potential of zero-valent iron [10], iron oxide [11], and magnetitebased sorbents [12] for the removal of chromate anions. Synthetic resins (chelating [13] or ion-exchange [14,15] have been frequently used for the recovery of chromate anions.…”

Microbial Nanotechnology for Bioremediation of Industrial Wastewater

“…The treated wastewater was suitable for discharge according to the environmental protection agency (EPA)'s recommendations. Magnetic separation and sorption were utilized for the removal of heavy metal (Nogueira et al, 2019). A graphene-based nanocollector was prepared by Hoseinian et al (2020).…”