Facile fabrication of superparamagnetic graphene/polyaniline/Fe3O4 nanocomposites for fast magnetic separation and efficient removal of dye

Abstract

Using graphene as adsorbent for removal of pollutants from polluted water is commonly recognized to be costly because the graphene is usually produced by a very complex process. Herein, a simple and eco-friendly method was employed to fabricate efficient superparamagnetic graphene/polyaniline/Fe3O4 nanocomposites for removal of dyes. The exfoliation of graphite as nanosheets and the functionalization of nanosheets with polyaniline and Fe3O4 nanoparticles were simultaneously achieved via a one-pot reaction process combining the intercalation polymerization of aniline and the co-precipitation of the residual Fe3+ and the generated Fe2+. The obtained graphene/polyaniline/Fe3O4 nanocomposites exhibited excellent adsorption performance for Congo red, even in the presence of Brilliant green. The adsorption kinetics and adsorption isotherms were well fitted with pseudo second-order kinetic model and Langmuir isotherm model, respectively. In a word, this method is simple and industrially feasible, which provides a new approach to fabricate highly efficient graphene-based adsorbents on large scale for removal of dyes. In addition, it also can be used to exfoliate other two-dimensional materials, such as boron nitride, carbon nitride and MoS2 for a range of possible applications.

Attapulgite: from clay minerals to functional materials

“…同理, 吸附材料吸附目标污染物之后成为废弃吸 附剂. 常规再生技术是采用酸、碱、硫脲等进行解吸 污染物分子和活化吸附剂吸附位点 [60,73] , 不仅会造成 图 10 羧基功能化磁性凹凸棒石/碳复合材料的形成机理 示意图 [176] (网络版彩图) Figure 10 Schematic diagram of formation mechanism of carboxyl functionalized attapulgite/carbon composite [176] (color online).…”

The application of copolymer‐coated graphene oxide‐Fe3O4 in the highly efficient synthesis of 2′‐aminospiro[indeno[1,2‐b]quinoxaline‐11,4′‐[4'H] pyran]‐3′‐carbonitrile and 2′‐aminospiro[indeno‐2,4′‐[4'H]pyran]‐3′‐carbonitrile

“…The XPS spectrum of poly(Py‐co‐Ani)@GO‐Fe 3 O 4 nanocomposite represents the decocvolution of N 1 s at 399 eV for amine and imine components of the copolymer (Figure c). As shown in Figure d, the typical doublets at 711.2 and 724.8 eV correspond to the characteristic peaks of Fe 2p 3/2 and Fe 2p 1/2 respectively …”

One‐Pot Synthetic Approach for Magnetically Separable Graphene Nanocomposite for Dye Degradation

“…High‐resolution C1s XPS spectra of GO displayed three components which correspond to the carbon atom in different functional groups, that is the 284.4 eV (C−C), carbon in a 286.4 eV (C=C/C−O) bonds and 288.4 eV (C=O (OH)) (Figure S1). High resolution C1s XPS spectrum of the G@PANI‐Fe 3 O 4 nanocomposite (Figure b) shows different peak at 284.6 eV (C−C), 286.2 eV showed (C−N/C=N) and 288.3 eV indicates (C=O (OH)) respectively as compared to graphene oxide. In the case of high‐resolution N1s spectrum of G@PANI‐Fe 3 O 4 shows three different peaks at 398.7 eV (=NH−), 399.5 eV (−NH−) and 400.7 eV (−NH + −) respectively (Figure c).…”