Graphene‐Based Multifunctional Iron Oxide Nanosheets with Tunable Properties

Abstract

We report the synthesis of graphenes with tunable properties due to the growth of needlelike iron oxide (IO) nanoparticles on their surfaces. The electrical conductivity, flexibility, and magnetic properties of graphene nanosheets (GNSs) could be tuned on demand by fine controlling both the surface coverage and the length of the IO nanoneedles. The degree of coverage of the IO nanoparticles on the surface of the GNSs made it possible to control the resulting properties of the IO/GNSs on demand. As examples of their utility, paperlike materials were generated by simple filtration, and the resulting IO/GNS nanocomposites showed extraordinary removal capacity and fast adsorption rates for As(V) and Cr(VI) ions in water. Another possible application is the preparation of multifunctional films equipped with conductivity, flexibility, and magnetic properties. The fabrication process is easy to scale up at a low cost. In addition, both the colloidal solution and film forms of the resulting IO/GNSs were effective for removal of heavy metal ions, meaning this material could be utilized for actual industrial applications.

Solvothermal synthesis of MnFe2O4-graphene composite—Investigation of its adsorption and antimicrobial properties

“…Several studies on magnetic/graphene composites showed good adsorption in the removal of metal ions from the large volumes of wastewater [20][21][22]. Recently magnetic graphene oxide and magnetic graphene nano composites were using for water treatment and drug delivery [23][24][25][26].…”

Synthesis of Fe3O4@TiO2 core–shell magnetic composites for highly efficient sorption of uranium (VI)

“…They can be easily separated from matrices by an external magnetic field, which makes solid-liquid phase separation fast, simple, as well as highly effective. Therefore, magnetic nanoparticles (MNPs), especially Fe 3 O 4 , have attracted quite a lot of attentions because of the outstanding properties such as easy separation and low toxicity [14][15][16][17]. Das et al [18] have studied the sorption of uranium (VI) on magnetite (Fe 3 O 4 ) nanoparticles, but the sorption capacity is relatively low.…”

Three-dimensional Fe3O4-graphene macroscopic composites for arsenic and arsenate removal

“…GO or rGO have high surface area, mechanical stability, and surface functional groups, which provide as a good support for other adsorbents [38]. In recent years 2D functionalized graphene nanosheets [39], iron oxide-graphene [40][41], ferric hydroxide-GO [42], magnetic Fe 3 O 4 -GO [43], magnetic Fe 3 O 4 -rGO [44], layered double hydroxides (LDH)-GO [45], magnetic Fe 3 O 4 -LDH-graphene [46], and Fe 3 O 4 -MnO 2 -rGO [47] nanocomposites have been attempted to use as adsorbents for removal of arsenic from water. Oh's group developed a one-pot microwave method to produce 3D graphene-carbon nanotubeiron oxide nanostructures for removal of arsenic from contaminated water [48].…”