Comparing the effects of different oxygen-containing functional groups on sulfonamides adsorption by carbon nanotubes: Experiments and theoretical calculation

Wei, Jingmiao; Sun, Weiling; Pan, Weiyi; Yu, Xiangquan; Sun, Geng; Jiang, Hong

doi:10.1016/j.cej.2016.11.133

Cited by 95 publications

(20 citation statements)

References 69 publications

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“…4b, c. Peaks at 284.8 eV, 285.8 eV and 286.8 eV were contributed by C-C, C-O and C=O, testifying the hydrophobic surface of PABC-700 (Wei et al 2017;Zhao et al 2016), which would be beneficial to the conductive of adsorption (Tomczyk et al 2020). As for P2p, two peaks at 134.1 eV and 135.8 eV, attributed to P-O and P=O (Liu et al 2017;Pan et al 2021), were separated as an evidence for the successful introduction of phosphoruscontaining groups to the surface of PABC-700 by means of phosphoric acid modification.…”

Section: Physical and Chemical Properties Of The Synthetic Carbonaceo...mentioning

confidence: 95%

Impacts of temperatures and phosphoric-acid modification to the physicochemical properties of biochar for excellent sulfadiazine adsorption

Zeng

Wang²,

et al. 2022

Biochar

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The textural properties and surface chemistry of phosphoric acid-modified biochars (PABCs) prepared at different pyrolysis temperatures (500–700 °C) were studied based on the results obtained from XRD, SEM, BET, FT-IR, Raman, XPS and elements analyses. PABCs prepared at higher temperatures tended to possess a bigger proportion of microporous structure. The adsorption capacity and initial rate of PABCs for sulfadiazine (SDZ) were notably improved to 139.2 mg/g and 9.66 mg/(g min) as calculated from the Langmuir model. The adsorption equilibrium time was only one quarter of that without modification. The H3PO4 modification was advantageous to produce phosphate and break functional groups to form disordered carbon structure abundant of micropores. The enhancement in the adsorption of SDZ was due to the confinement effect of hydrophobic cavities from the mircoporous structure and the π–π electron–donor–acceptor interaction. Specially, PABCs exhibited stable adsorption capacities at a wide pH range (3.0–9.0) or relatively high concentrations of coexisting ions.

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Section: Physical and Chemical Properties Of The Synthetic Carbonaceo...mentioning

confidence: 95%

Impacts of temperatures and phosphoric-acid modification to the physicochemical properties of biochar for excellent sulfadiazine adsorption

Zeng

Wang²,

et al. 2022

Biochar

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“…The oxygen-containing surface groups formed during ozonation are basic pyrone-type groups, which contain two non-neighboring oxygen atoms, constituting one basic site. The basic groups are the Lewis type associated with π electron-rich regions found within the basal plane [43][44][45].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Enhanced removal of acetaminophen from synthetic wastewater using multi-walled carbon nanotubes (MWCNTs) chemically modified with NaOH, HNO3/H2SO4, ozone, and/or chitosan

Lin

Kurniawan

Albadarin

et al. 2018

Journal of Molecular Liquids

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This study investigates the technical feasibility of MWCNTs for acetaminophen (Ace) removal from synthetic wastewater in batch mode. To improve their removal performance, the surface of the MWCNTs was chemically modified with NaOH, HNO 3 /H 2 SO 4 , ozone and/or chitosan. The effects of pertinent parameters such as reaction time, dose, pH, and agitation speed on the Ace removal were evaluated. Their removal performance on Ace was compared to those of previous studies. The adsorption mechanisms of Ace removal by the MWCNTs are also presented. It is evident from this study that after chemical modification on its surface, the treated nano-adsorbent significantly enhanced Ace removal from wastewater. Among all types of those adsorbents, the ozone-treated MWCNT stands out for the highest Ace removal (95%) under the same initial Ace concentration of 10 mg/L. Their adsorption capacities, applicable to the Freundlich isotherm model, are listed as: ozone-treated MWCNT (250 mg/g) > chitosan-coated MWCNT (205 mg/g) > acid-treated MWCNT (160 mg/g) > NaOH-treated MWCNT (130 mg/g) > as-received MWCNT (90 mg/g). Although the ozone-treated MWCNT has the most outstanding performance in Ace removal, its treated effluent still could not meet the required effluent limit of less than 0.2 mg/L set by China's legislation. This suggests that further treatment using biological processes needs to be carried out to complement Ace removal from the wastewater samples.

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“…51,52 The covalently oxygen functional groups on the surface of CNT improve their dispersity in polar solvents. 53,54 More importantly, they provide coordinate sites for extensive interactions between the interface and nanoparticles/clusters and macromolecules, [55][56][57] even catalyze the chemical reaction. 58 Generally, the oxygen functional groups on the CNT surface seldom migrate or change under ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

Unexpected spontaneous dynamic oxygen migration on carbon nanotubes

et al. 2021

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Comparing the effects of different oxygen-containing functional groups on sulfonamides adsorption by carbon nanotubes: Experiments and theoretical calculation

Cited by 95 publications

References 69 publications

Impacts of temperatures and phosphoric-acid modification to the physicochemical properties of biochar for excellent sulfadiazine adsorption

Impacts of temperatures and phosphoric-acid modification to the physicochemical properties of biochar for excellent sulfadiazine adsorption

Enhanced removal of acetaminophen from synthetic wastewater using multi-walled carbon nanotubes (MWCNTs) chemically modified with NaOH, HNO3/H2SO4, ozone, and/or chitosan

Unexpected spontaneous dynamic oxygen migration on carbon nanotubes

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