Rapid Removal and Separation of Iron(II) and Manganese(II) from Micropolluted Water Using Magnetic Graphene Oxide

Abstract

A novel two-dimensional carbon-based magnetic nanomaterial, magnetic graphene oxide (MGO), was prepared and then used as an efficient adsorbent. MGO showed rapid and complete removal of iron(II) (Fe) and manganese(II) (Mn) from micropolluted water bodies over a wide pH range. After saturated adsorption, MGO could be rapidly separated from water under an external magnetic field. Results of the adsorption equilibrium study indicated that the adsorption of Fe and Mn by MGO took place via monolayer heterogeneous and spontaneous processes resulting from the heterogeneity of the MGO surface as well as from the electrostatic interactions between surface acidic groups of MGO and metal ions. In addition, both the Fe and Mn uptake of MGO was very slightly affected by NaCl, although it decreased with increased humic acid in solutions. In an Fe/Mn binary aqueous system, both metal ions can be efficiently removed at low concentrations, but MGO showed preferential adsorption of Fe in a concentrated aqueous mixture. The adsorption behavior in the binary system was due to different affinities of surface oxygen-containing functional groups on MGO to Fe and Mn. Finally, unlike traditional approaches in recycling and reusing an adsorbent, the Fe- and Mn-loaded MGO can be directly applied as a new adsorbent to achieve the efficient removal of fluoride from aqueous solutions.

Recent Advances in Applications of Hybrid Graphene Materials for Metals Removal from Wastewater

“…While GO has high reusability, as its desorption percentages reached 95.45% for Au(III), 94.64% for Pd (II) and 99.37% for Pt(IV) [175]. MGO's adsorption values can be compared to those for adsorbents that have been reported before, suggesting that it could be reusable [176]. The desorption percentage of CSGO 5 remained about 95% with both Au(III) and Pd(II) after 3 cycles, showing that it is possible to successfully reuse CSGO 5 for the adsorption of both metals [177].…”

Preparation of Modified Graphene Oxide Nanomaterials for Water and Wastewater Treatment

“…These inorganic materials can be mixed with GO or in situ synthesized on the [11] In our previous work, MOF-encapsulated GO yolk-shell superstructures were fabricated by a facile spray-drying method. The fabricated MOF-GO composite showed great potential in preferential adsorption and sustained release of small molecule [12].…”

Preparation, characterization, and application of synthesized thiourea formaldehyde-calcium alginate in removal of Reactive Black 5

“…The adsorption experiments of anionic dye RB5 were carried out in batch equilibrium mode. A (0.02 -0.1 g) sample of (TFCA) composite with 25 mL aqueous solution of a (1.2x10 -5 -5x10 -5 M) (RB5) solution at various pHs (1)(2)(3)(4)(5)(6)(7)(8)(9) reached for 120 min was adjusted by adding a small amount of HCl or NaOH solution (0.01 -0.1 M) using a pH meter. Samples were collected and filtrated through A Whatman (number 40) filter paper and the filtrates were subjected to quantitative analyses.…”

“…Water pollution is an important environmental problem and receives major worldwide concerns [1][2][3] . Dyes discharged together with industrial textile wastewaters are main organic pollutants due to they are highly visible and undesirable even at low concentrations in water [4][5][6] .…”