Adsorption mechanism of emerging and conventional phenolic compounds on graphene oxide nanoflakes in water

Catherine, Hepsiba Niruba; Ou, Ming-Han; Basavaraju, Manu; Shih, Yang-hsin

doi:10.1016/j.scitotenv.2018.03.389

Cited by 110 publications

(31 citation statements)

References 48 publications

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“…The surface charge (zeta potential) of TA-poly(AN- co -AA) increased negatively with increases in the solution pH from 3 to 9. Similar trends was reported by [38]. These negative surface charges proven the accessibility of functional groups at the surfaces of functionalized polymer, since thioamide group incorporation lead to hydrophobic/hydrophilic balance which enhanced adsorptive activity [23].…”

Section: Resultssupporting

confidence: 80%

Adsorptive Removal of Methylene Blue from Aquatic Environments Using Thiourea-Modified Poly(Acrylonitrile-co-Acrylic Acid)

et al. 2019

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The paper evaluates the adsorptive potential of thiourea-modified poly(acrylonitrile-co-acrylic acid), (TA-poly(AN-co-AA)) for the uptake of cationic methylene blue (MB) from aquatic environments via a batch system. TA-poly(AN-co-AA) polymer was synthesized through redox polymerization and modified with thiourea (TA) where thioamide groups were introduced to the surface. Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), CHNS and Zetasizer were used to characterize the physico-chemical and morphological properties of prepared TA-poly(AN-co-AA). Afterwards, it was confirmed that incorporation of thioamide groups was successful. The adsorption kinetics and equilibrium adsorption data were best described, respectively, by a pseudo-second-order model and Freundlich model. Thermodynamic analysis showed the exothermic and spontaneous nature of MB uptake by TA-poly(AN-co-AA). The developed TA-poly(AN-co-AA) polymer demonstrated efficient separation of MB dye from the aqueous solution and maintained maximum adsorption capacity after five regeneration cycles. The findings of this study suggested that synthesized TA-poly(AN-co-AA) can be applied successfully to remove cationic dyes from aquatic environments.

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Section: Resultssupporting

confidence: 80%

Adsorptive Removal of Methylene Blue from Aquatic Environments Using Thiourea-Modified Poly(Acrylonitrile-co-Acrylic Acid)

et al. 2019

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“…e aqueous dispersion of TU-poly(AN-co-AA) was also found negative in the neutral pH, emanated from the low negative value of zeta potential (−3.4 mV). ese negative surface charges confirmed the availability of negatively charged functional groups at the edges of the modified polymer surface since thioamide, carbonyl, and hydroxyl groups leads to extreme hydrophilicity with negative charge density [39][40][41].…”

Section: Characterization Of Poly(an-co-aa) and Tu-poly(anco-aa)mentioning

confidence: 80%

Adsorption of Malachite Green Dye from Liquid Phase Using Hydrophilic Thiourea-Modified Poly(acrylonitrile-co-acrylic acid): Kinetic and Isotherm Studies

Adeyi

Jamil

Abdullah

et al. 2019

Journal of Chemistry

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Thiourea-modified poly(acrylonitrile-co-acrylic acid) (TU-poly(AN-co-AA)) adsorbent was a surface modification of poly(acrylonitrile-co-acrylic acid) synthesized by facile redox polymerization. Surface functionalization with thiourea was carried out to provide hydrophilicity on the surface of a polymeric adsorbent. Fourier transform infrared (FTIR) spectrometer, scanning electron microscope (SEM), and Zetasizer characterized the morphology and structures of TU-poly(AN-co-AA). Copolymerization of poly(acrylonitrile-co-acrylic acid) and its successful incorporation of the thioamide group was confirmed by the FTIR spectra. The SEM micrographs depicted uniform and porous surface morphologies of polymeric particles. The average diameter of modified and unmodified poly(acrylonitrile-co-acrylic acid) was 289 nm and 279 nm, respectively. Zeta potentials of TU-poly(AN-co-AA) revealed the negatively charged surface of the prepared polymer. Adsorption capacities of hydrophilic TU-poly(AN-co-AA) were investigated using malachite green (MG) as an adsorbate by varying experimental conditions (pH, initial concentration, and temperature). Results showed that the pseudo-second-order reaction model best described the adsorption process with chemisorption being the rate-limiting step. Furthermore, Elovich and intraparticle diffusions play a significant role in adsorption kinetics. The equilibrium isotherm has its fitness in the following order: Freundlich model > Temkin model > Langmuir model. Thermodynamic analysis indicates that the sorption process is spontaneous and exothermic in nature. The reusability results suggested potential applications of the TU-poly(AN-co-AA) polymer in adsorption and separation of cationic malachite green dye from wastewater.

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“…There were many significant differences observed after the dye adsorption. Typically, the intensity of N–H and O–H bands at 3311.78 cm −1 were decreased to 3282.84 cm −1 denoting an influence of hydroxyl functional group and hydrogen bond that were involved in the adsorption ( Catherine et al., 2018 ; Du et al., 2014 ; Mohamed et al., 2019 ). The peak at 1635.64 cm −1 ascribed to C=C functional group was decreased to 1633.71 denoting the participation of π-π interactions in the dye uptake ( Dai et al., 2018 ).…”

Section: Resultsmentioning

confidence: 99%

Statistical optimization of textile dye effluent adsorption by Gracilaria edulis using Plackett-Burman design and response surface methodology

Venkataraghavan

Thiruchelvi

Sharmila

2020

Heliyon

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Statistical optimization models were employed to optimize the adsorption of textile dye effluent onto Gracilaria edulis . Significant factors responsible for adsorption were determined using Plackett-Burman design (PBD) and were time, pH, and dye concentration. Box-Behnken (BB) design was used for further optimization. The predicted and the experimental values were found to be in good agreement, the coefficient of determination value 0.9935 and adjusted coefficient of determination value 0.9818 indicated that the model was significant. The results of predicted response optimization showed that maximum decolorization could be attained with time 131.51 min, pH 7.48, and dye concentration 23.13%. The model was validated experimentally with 92.65% decolorization efficiency. The experiment was confirmed using Fourier transform infrared spectroscopy (FTIR), high-resolution scanning electron microscope coupled with energy dispersive X-ray analysis (HR-SEM-EDX), X-ray diffraction spectrometry (XRD) and Brunauer-Emmett-Teller (BET) surface area and pore size analysis techniques. Desorption studies at various pH (2–14) were performed and a maximum of 23% of the dye was recovered from the adsorbed biomass.

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Adsorption mechanism of emerging and conventional phenolic compounds on graphene oxide nanoflakes in water

Cited by 110 publications

References 48 publications

Adsorptive Removal of Methylene Blue from Aquatic Environments Using Thiourea-Modified Poly(Acrylonitrile-co-Acrylic Acid)

Adsorptive Removal of Methylene Blue from Aquatic Environments Using Thiourea-Modified Poly(Acrylonitrile-co-Acrylic Acid)

Adsorption of Malachite Green Dye from Liquid Phase Using Hydrophilic Thiourea-Modified Poly(acrylonitrile-co-acrylic acid): Kinetic and Isotherm Studies

Statistical optimization of textile dye effluent adsorption by Gracilaria edulis using Plackett-Burman design and response surface methodology

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