Adsorptive removal of methylene blue by rhamnolipid-functionalized graphene oxide from wastewater

Wu, Zhibin; Zhong, Hua; Yuan, Xingzhong; Wang, Hou; Wang, Lele; Chen, Xiaohong; Zeng, Guangming; Wu, Yan

doi:10.1016/j.watres.2014.09.026

Cited by 543 publications

(224 citation statements)

References 65 publications

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“…[19] However, after adsorption, the GO must be separated via centrifugation at higher speeds because of its relative stability in water. [20] Separation of GO from solution will be costly and poses a secondary pollution risk in water, because it cannot be separated completely due to its nanoscale.…”

Section: Introductionmentioning

confidence: 99%

Removal of methylene blue from water by cellulose/graphene oxide fibres

Chen

et al. 2016

Journal of Experimental Nanoscience

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A novel and efficient cellulose/graphene oxide (CGO) fibre adsorbent was prepared by wet-spinning technique. The morphology and physicochemical properties of the CGO fibres were characterised by scanning electron microscope (SEM), Fourier transform infrared spectrometer, and thermo-gravimetric analysis. The equilibrium adsorption data were well fitted to the Langmuir models, and the adsorption capacity calculated from the Langmuir model reached 480.77 mg/g at 318 K. The adsorption kinetic studies revealed that pseudo-second-order model best describes the adsorption kinetic data. The thermodynamic parameters indicated that the adsorption was an endothermic and spontaneous process. Furthermore, the CGO fibre, which is very stable and easily separable, can be recycled with a dilute NaOH solution wash, retaining over 93% of the adsorption capacity after recycling three times.

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Section: Introductionmentioning

confidence: 99%

Removal of methylene blue from water by cellulose/graphene oxide fibres

Chen

et al. 2016

Journal of Experimental Nanoscience

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“…All the plots show a linear relation in the rst sorption stage (rapid removal) and the regression lines do not pass through the origin absolutely, which indicates that the external diffusion controlled the rate of sorption in the rst stage slightly, and the intra-particle diffusion is the main rate-controlling step subsequently. 26 The results could be illustrated by the hypothesis that the micropores on the surface of the three carbon materials may get blocked by the adsorbed PFOS and PFOA, resulting in the Fig . 6 Sorption kinetics of PFOS and PFOA on the PACFs, PAC and GAC respectively, fitted with pseudo-first-order and pseudo-secondorder kinetics models.…”

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confidence: 98%

Sorption of perfluorooctane sulfonate and perfluorooctanoate on polyacrylonitrile fiber-derived activated carbon fibers: in comparison with activated carbon

et al. 2017

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Polyacrylonitrile fiber (PANF)-derived activated carbon fibers (PACFs) were successfully prepared using a one step carbonation-activation, and were used for the sorption of perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA). High specific surface areas (SSAs) of 1782 m 2 g À1 and micro/ mesoporous structures of the PACFs were obtained by optimizing the preparation conditions of the PANF-based pre-oxidized fibers (PANOFs)/KOH ratio of 1 : 2 and an activation temperature of 800 C.The as-prepared PACFs exhibited flexibility and endless forms, and sorption capacities of 1.52 mmol g À1for PFOS and 0.73 mmol g À1 for PFOA, much higher than the commercially available coal-based powder activated carbon (PAC) and granular activated carbon (GAC), which was also indicated by the site energy distributions. The sorption system followed a pseudo-second-order kinetic model and a Freundlich isotherm model. The intra-particle diffusion and Boy's film-diffusion models were also used to verify that intra-particle diffusion is the main rate-controlling step. It was assumed that the multilayer sorption most probably occurs through electrostatic attraction and hydrophobic interaction, and some micelles and hemi-micelles form on the ACF surfaces. The PACFs show good reusability over five sorptiondesorption cycle studies.

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“…19 This is due to its rich characteristics in exhibiting high thermal conductivity, great charge carrier mobility, good surface contact with supported nanoparticles (NPs), and high hydrophobicity. [20][21][22][23][24][25] In addition, the spacious delocalized π-bond in the sp 2 -bonded carbon lattice has enhanced its structure stability and conductivity capacity. 20,26 There are few reports that demonstrate the contribution of RGO and Ag towards visible light enhancement.…”

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confidence: 99%

Reduced graphene oxide and Ag wrapped TiO2 photocatalyst for enhanced visible light photocatalysis

et al. 2015

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A well-organised reduced graphene oxide (RGO) and silver (Ag) wrapped TiO2 nano-hybrid was successfully achieved through a facile and easy route. The inherent characteristics of the synthesized RGO-Ag/TiO2 were revealed through crystalline phase, morphology, chemical composition, Raman scattering, UV-visible absorption, and photoluminescence analyses. The adopted synthesis route significantly controlled the uniform formation of silver nanoparticles and contributed for the absorption of light in the visible spectrum through localized surface plasmon resonance effects. The wrapped RGO nanosheets triggered the electron mobility and promoted visible light shift towards red spectrum. The accomplishment of synergised effect of RGO and Ag well degraded Bisphenol A under visible light irradiation with a removal efficiency of 61.9%.

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Adsorptive removal of methylene blue by rhamnolipid-functionalized graphene oxide from wastewater

Cited by 543 publications

References 65 publications

Removal of methylene blue from water by cellulose/graphene oxide fibres

Removal of methylene blue from water by cellulose/graphene oxide fibres

Sorption of perfluorooctane sulfonate and perfluorooctanoate on polyacrylonitrile fiber-derived activated carbon fibers: in comparison with activated carbon

Reduced graphene oxide and Ag wrapped TiO2 photocatalyst for enhanced visible light photocatalysis

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