Porous graphene oxide based inverse spinel nickel ferrite nanocomposites for the enhanced adsorption removal of arsenic

Abstract

Porous nanocomposites, graphene oxide based-inverse spinel nickel ferrite (GONF) and reduced graphene oxide based-inverse spinel nickel ferrite (rGONF), were prepared by co-precipitation of graphene oxide (GO) with nickel and iron salts at one pot.

Graphene Composites for Lead Ions Removal from Aqueous Solutions

“…Ferrite's can be easily separated using external magnetic field and can be reused without any structural changes several times. Graphene based magnetite's not only separated/ recovered easily but also shows higher absorption capacity [208,210,211]. For the preparation of NFRGO, hydrazine hydrate was added to the GO dispersion as prepared by Hummer's method [212,213].…”

Functional manganese ferrite/graphene oxide nanocomposites: effects of graphene oxide on the adsorption mechanisms of organic MB dye and inorganic As(v) ions from aqueous solution

“…This revealed that our MFO-GO nanocomposite with an optimized GO content ($20 wt%) exhibited some promising advantages, namely, greater removal efficiency, a higher maximum adsorption capacity and a shorter adsorption time in comparison with other reported adsorbents. [18][19][20][21][22][23][24][25] This can provide new opportunities to further enhance the removal performance of different pollutants from aqueous solutions by using a functional magnetic MFO-GO composite system. Furthermore, the regenerability and reusability of this adsorbent also exhibited high performance, in that >98% of the adsorbed arsenic(V) ions were released from the MFO-GO adsorbent.…”

“…Several mechanisms have been reported to explain the adsorption of MB dye and arsenic(V). [18][19][20][21][22][23][24][25] Firstly, the possible mechanisms of the adsorption of MB dye in a neutral solution can be understood in terms of four main factors (see Fig. 11(a)), namely: (i) electrostatic/ionic interactions.…”

“…In addition, it was found that a decrease in the potential of zero charge conrmed that the adsorption of different species of arsenic was mainly based on negatively charged inner-sphere complexes between arsenic species and MnFe 2 O 4 nanoparticles. [22][23][24][25] In the pH range of 2-3 arsenic species existed in two main forms, namely, H 3 OH groups from the MnFe 2 O 4 surface to form an inner-sphere complex; and (ii) electrostatic interactions. This adsorption mechanism is attributed to a chelation reaction between oxygen-containing functional groups (e.g., carboxyl (-COOH) and hydroxyl (-OH)) on GO nanosheets and arsenic(V) ions.…”

Nanostructured Spinel Ferrites: Synthesis, Functionalization, Nanomagnetism and Environmental Applications

“…The resulting material possesses high surface area since rGO avoids ferrite particle agglomeration. Ni, Co and Mn ferrites/rGO nanocomposites have been synthesized with this strategy [53][54][55]. Alternatively, some investigations have reported the use of organic amines, which can act as precipitating and stabilizing agents [17,56,57].…”