Ionic liquids modified graphene oxide composites: a high efficient adsorbent for phthalates from aqueous solution

Abstract

In 2015, more than 30% of erasers were found to contain a PAE content that exceeded the 0.1% limit established by the Quality and Technology Supervision Bureau of Jiangsu Province in China. Thus, strengthening the supervision and regulation of the PAE content in foods and supplies, in particular, remains necessary. Graphene oxide (GO) and its composites have drawn great interests as promising adsorbents for polar and nonpolar compounds. However, GO-based adsorbents are typically restricted by the difficult separation after treatment because of the high pressure in filtration and low density in centrifugation. Herein, a series of novel ionic liquids modified graphene oxide composites (GO-ILs) were prepared as adsorbents for phthalates (PAEs) in eraser samples, which overcame the conventional drawbacks. These novel composites have a combination of the high surface area of graphene oxide and the tunability of the ionic liquids. It is expected that the GO-ILs composites can be used as efficient adsorbents for PAEs from aqueous solution. This work also demonstrated a new technique for GO-based materials applied in sample preparation.

A Novel Nanocomposite with Superior Antibacterial Activity: A Silver‐Based Metal Organic Framework Embellished with Graphene Oxide

“…Four kinds of C atoms related to various functional groups were observed in the C1s spectrum of the GO (Figure b). The peak related to the nonoxygenated carbons (CC, CC) appeared at ≈284.7 eV . Two intermediate peaks at ≈285.5 and ≈286.8 eV are assigned to CO groups (COH and COC) .…”

Ionic liquid-based graphene oxide-coated fiber for headspace-solid phasemicroextraction of polycyclic aromatic hydrocarbons in water samples

“…Two absorption peaks at 1719 cm −1 and 1610 cm −1 are due to the stretching vibration of C=O and C=C groups in the aromatic parts. The peaks at 1410, 1265, and 1032 cm −1 correspond to the stretching vibration of the carbon skeleton and C-O of epoxy and alkoxy groups, respectively [19,20] [21,22]. These results proved that ionic liquid is covalently bonded to graphene oxide.…”

Determination of Phthalate Esters in Water and Coffee by Solid‐Phase Microextraction Using Vinyl Terminated Imidazolium Based Ionic Liquid Grafted on Graphene Oxide Coatings

“…After preparation of GO‐ILs, aromatic and aliphatic C−H stretching vibrations of ILs were observed at 3145, 2918–2920, and 2848–2850 cm −1 , respectively. The peaks at around 1652, 1556–1559, 1445–1452, 1151–1162 and 710–820 cm −1 were stretching vibration of C−N, and C=N of imidazolium ring of ILs, ring in‐plane asymmetric stretching from imidazolium ring and (N)CH 2 and (N)CH 3 stretching and C−H out of plane bending vibration, respectively …”

“…Generally, the appropriate sample pretreatment should be processed for the real samples prior to chromatographic analysis. Until this time, different sample preparation techniques have been used for the analysis of PAEs in different matrices such as dispersive liquid‐liquid microextraction, solid phase extraction, and magnetic solid phase extraction . However, these extraction procedures require a large amount of sample, usage of solvent or long analysis time and they are also limited to slow response, more analysis steps, and costly factors .…”