Shell-free three-dimensional graphene-based monoliths for the aqueous adsorption of organic pollutants

Fang, Zheng; Hu, Yongyou; Zhang, Weiwen; Ruan, Xian

doi:10.1016/j.cej.2017.01.072

Cited by 32 publications

(8 citation statements)

References 49 publications

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“…The peak of 2690 cm −1 was the 2D band related to the double resonance Raman process [53]. The feature of these peaks was consistent with that of graphene-based materials [54], where the D peak was regarded as a disorder peak derived from the breathing motion of sp 2 carbon rings, the G peak was considered as a graphite peak arose from the stretching vibration of sp 2 carbon atoms in both rings and chains, and the 2D peak was a typical peak closely interrelated with the single layer grapheme. The Raman spectra results demonstrated the graphene like structure of CN in LaFeO 3 /g-C 3 N 4 heterojunctions.…”

Section: Characterization Of Prepared Mesoporous Lafeo3/g-c3n4 Heterosupporting

confidence: 75%

“…The The Raman spectra of CN and 2-LFC were shown in Figure 4b. Raman spectroscopy was considered to be a standard nondestructive and effective technique to characterize the chemical structures, especially the defects and the disorder of sp 2 carbon phase in CN and 2-LFC [52][53][54]. There were three characteristic sharp peaks located at 1345, 1590 and 2690 cm −1 for 2-LFC and CN.…”

Section: Characterization Of Prepared Mesoporous Lafeo3/g-c3n4 Heteromentioning

confidence: 99%

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Superior Adsorption and Photocatalytic Degradation Capability of Mesoporous LaFeO3/g-C3N4 for Removal of Oxytetracycline

Yang

Ruan

et al. 2020

Catalysts

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Mesoporous LaFeO3/g-C3N4 Z-scheme heterojunctions (LFC) were synthesized via the incorporation of LaFeO3 nanoparticles and porous g-C3N4 ultrathin nanosheets. The as prepared LFC were characterized by transmission electron microscopy, scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, powder X-ray diffraction, Raman spectra and N2 adsorption analysis. The structural analysis indicated that the reheating process and the addition of NH4Cl in the thermal polymerization were the key factors to get porous g-C3N4 ultrathin nanosheets and to obtain high specific surface areas of LFC. It remarkably enhanced the adsorption capacity and photocatalytic degradation of LFC for removal of oxytetracycline (OTC). The effect of the mass percentage of LaFeO3 in LFC, pH and temperature on the OTC adsorption was investigated. The LaFeO3/g-C3N4 heterojunction with 2 wt % LaFeO3 (2-LFC) exhibited highest saturated adsorption capacity (101.67 mg g−1) and largest photocatalytic degradation rate constant (1.35 L g−1 min−1), which was about 9 and 5 times higher than that of bulk g-C3N4 (CN), respectively. This work provided a facile method to prepare mesoporous LaFeO3/g-C3N4 heterojunctions with especially well adsorption and photocatalytic activities for OTC, which can facilitate its practical applications in pollution control.

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Section: Characterization Of Prepared Mesoporous Lafeo3/g-c3n4 Heterosupporting

confidence: 75%

Section: Characterization Of Prepared Mesoporous Lafeo3/g-c3n4 Heteromentioning

confidence: 99%

Superior Adsorption and Photocatalytic Degradation Capability of Mesoporous LaFeO3/g-C3N4 for Removal of Oxytetracycline

Yang

Ruan

et al. 2020

Catalysts

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“…Given the characteristics of BPA and of the nanocomposites prepared, the adsorption mechanisms may involve electrostatic interactions, hydrogen bonding and π–π interactions [3,67]. Additionally, the GO-polymer nanocomposites can adsorb a part of the BPA because of the hydrophobic interactions between the BPA and the adsorbents [68].…”

Section: Resultsmentioning

confidence: 99%

Graphene Oxide Based Magnetic Nanocomposites with Polymers as Effective Bisphenol–A Nanoadsorbents

et al. 2019

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Magnetic graphene oxide was impregnated with polymers for the preparation of nanocomposite adsorbents to be examined for the adsorptive removal of a typical endocrine disruptor, bisphenol–A (BPA) from aqueous solutions. The polymers used were polystyrene, chitosan and polyaniline. The nanocomposites prepared were characterized for their structure, morphology and surface chemistry. The nanocomposites presented an increase adsorptive activity for BPA at ambient conditions, compared to pure magnetic oxide, attributed to the synergistic effect of the polymers and the magnetic graphene oxide. The increased adsorption of BPA exhibited by the nanocomposites with chitosan and polyaniline could be attributed to the contribution of amine groups.

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“…However, other adsorbents such as coals [12], Kaolinite [13], pillared clays [14], and so on all shared the same characteristics of larger specific surface areas and porous structures [15]. Scientists have also found that many other porous materials with chelating functional groups which effectively remove heavy metals and organics from sewerage [16,17]. However, it has been found that few sorbents simultaneously have excellent chemical and thermal stabilities during the adsorption process [18].…”

Section: Introductionmentioning

confidence: 99%

Adsorption Analyses of Phenol from Aqueous Solutions Using Magadiite Modified with Organo-Functional Groups: Kinetic and Equilibrium Studies

Wang

et al. 2018

Materials

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Organically-modified magadiite (MAG–CTAB–KH550) was synthesized via ion-exchange method and condensation reaction in the presence of pure magadiite (MAG), cetyltrimethylammonium bromide (CTAB) and γ-aminopropyltriethoxysilane (KH550) in aqueous solution in this research. This new adsorbent material was studied using scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), and N2 adsorption/desorption isotherms process. It was found that the MAG–CTAB–KH550 has high Brunaur-Emmet-Teller (BET) specific surface area and mesoporous pore size distribution which enhanced its ability to remove phenol in aqueous solution; and, the value of pH has a relatively large impact on the adsorption behavior of the sorbent. Finally, the adsorptive behavior of the mesoporous material on phenol was followed pseudo-second-order kinetic adsorption model. In contrast, the adsorption equilibrium isotherm was better performed Langmuir isotherm model than the Freundlich isotherm model; in addition, the results also showed that the MAG–CTAB–KH550 had a better adsorption capacity and removal efficiency than MAG.

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Shell-free three-dimensional graphene-based monoliths for the aqueous adsorption of organic pollutants

Cited by 32 publications

References 49 publications

Superior Adsorption and Photocatalytic Degradation Capability of Mesoporous LaFeO3/g-C3N4 for Removal of Oxytetracycline

Superior Adsorption and Photocatalytic Degradation Capability of Mesoporous LaFeO3/g-C3N4 for Removal of Oxytetracycline

Graphene Oxide Based Magnetic Nanocomposites with Polymers as Effective Bisphenol–A Nanoadsorbents

Adsorption Analyses of Phenol from Aqueous Solutions Using Magadiite Modified with Organo-Functional Groups: Kinetic and Equilibrium Studies

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