Insights into the mechanism of cationic dye adsorption on activated charcoal: The importance of π–π interactions

Tran, Hai Nguyen; Wang, Ya-Fen; You, Sheng‐Jie; Chao, Huan‐Ping

doi:10.1016/j.psep.2017.02.010

Cited by 274 publications

(121 citation statements)

References 40 publications

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“…Other mechanisms responsible for the adsorption of chloramphenicol can be the n-interactions between the benzene rings of chloramphenicol (electron acceptor) and carbonyl groups on the surface of activated carbon (electron donors) and the π-π interactions between π electrons of activated carbons and π electrons in the aromatic ring of chloramphenicol [51,54,58]. Similar trends in the effect of the pH were obtained by other researchers [36,37,53,59].…”

Section: Impact Of Process Conditionssupporting

confidence: 69%

“…This may indicate the significance of the phenomenon of volumetric pore filling. It is a mechanism concerning adsorption of organic compounds of quite large sizes, comparable to pore sizes [53]. The activated carbons tested are sorbents with a high content of micropores (from 32%-52%) and a diameter below 2 nm, while molecular radius of chloramphenicol is 0.45 nm.…”

Section: Isotherms Of Chloramphenicol Adsorption On Commercial Activamentioning

confidence: 99%

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Adsorption of Chloramphenicol on Commercial and Modified Activated Carbons

Lach

2019

Water

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The aim of the study was to evaluate the possibility of applying commercial activated carbons currently used in water treatment plants and modified carbon at 400 and 800 °C in the atmosphere of air, water vapour and carbon dioxide to remove chloramphenicol. Adsorption kinetics was examined for solutions with pH of 2–10. Adsorption kinetics were determined for the initial concentration of chloramphenicol of 161 mg/dm3 and the adsorption isotherm was determined for the concentrations of 161 to 1615 mg/dm3. Of the analysed activated carbons (F-300, F-100, WG-12, ROW 08 Supra and Picabiol), the highest adsorption capacity was obtained for the use of Picabiol (214 mg/g), characterized by the highest specific surface area and pore volume. The pH value of the solution has little effect on the adsorption of chloramphenicol (the highest adsorption was found for pH = 10, qm = 190 mg/g, whereas the lowest—for pH = 6, qm = 208 mg/g). Modification of activated carbon WG-12 at 800 °C caused an increase in adsorption capacity from 195 mg/g (unmodified carbon) to 343 mg/g. A high correlation coefficient was found between the capacity of activated carbons and the total volume of micropores and mesopores. Among the examined adsorption kinetics equations (pseudo-first order, pseudo-second order, Elovich, intraparticle diffusion), the lowest values of the R2 correlation coefficient were obtained for the pseudo-first order equation. Other models with high correlation coefficient values described the adsorption kinetics. The adsorption results were modelled by means of the Freundlich, Langmuir, Temkin and Dubibin–Radushkevich adsorption isotherms. For all activated carbons and process conditions, the best match to the test results was obtained using the Langmuir model, whereas the lowest was found for the Dubibin–Radushkevich model.

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Section: Impact Of Process Conditionssupporting

confidence: 69%

Section: Isotherms Of Chloramphenicol Adsorption On Commercial Activamentioning

confidence: 99%

Adsorption of Chloramphenicol on Commercial and Modified Activated Carbons

Lach

2019

Water

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“…After a shaking of 24 h, the final pH value (pHf) was measured. The pHPZC was obtained from the plot of ∆pH (pHi -pHf) against the pHi [20]. All experiments were carried out at room temperature (~ 25 °C), otherwise stated.…”

Section: Characterization Of Cofe19mo01o4 Nanoparticlesmentioning

confidence: 99%

Synthesis and Characterization of Magnetic CoFe1.9Cr0.1O4 Nanoparticles by Sol-gel Method and Their Applications as an Adsorbent for Water Treatment

Amar¹,

Sharif²,

Omer³

et al. 2018

Proceedings of First Conference for Engineering Sciences and Technology: Vol. 2

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Water contamination by synthetic dyes is considered as a serious environmental issue, globally. In this study, the adsorptive removal of a very toxic cationic dye, methylene blue (MB), from aqueous solution was investigated using spinel ferrite, CoFe1.9Cr0.1O4 (CFC), magnetic nanoparticles as an adsorbent. CoFe1.9Cr0.1O4 powder was successfully synthesized via a sol-gel process and characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) techniques. The effect of various experimental parameters on MB removal including; contact time, initial dye concentration, adsorbent dosage, solution pH and temperature were investigated. The results revealed that about 94 % of MB was removed under the optimal operational conditions. The adsorption kinetics showed that adsorption data were better described by pseudo-second-order model (PSO). In addition, the adsorption isotherms follow Langmuir isotherm model and the maximum monolayer adsorption capacity was found to be 11.41 mg/g. The calculated thermodynamic parameters (i.e., ∆G o , ∆H o , ∆S o) indicate that the proposed adsorption process of methylene blue onto CoFe1.9Cr0.1O4 nanoparticles is exothermic and spontaneous in nature. The results suggest that the synthesized magnetic nanoparticles (CFC) can be employed for the removal of toxic cationic synthetic dyes from wastewater.

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“…The adsorption capacity is mainly dependent on GO contents of the composite membranes, and the pseudo-second-order model showed a better fit [37]. The mechanism of adsorption was suggested for π-π stacking interaction between delocalized π electrons in graphene and aromatic rings of dyes [38].…”

Section: Graphene and Graphene Oxidementioning

confidence: 95%

Composite Nanofibers: Recent Progress in Adsorptive Removal and Photocatalytic Degradation of Dyes

Phan¹,

Kim²

2020

Composite and Nanocomposite Materials - From Knowledge to Industrial Applications

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This chapter intends to review the state of the art of a new nanomaterial generation based on electrospun composite nanofibers for dye removal from wastewater. Natural polymer-based nanofibers, nanofibers with unique morphology, and carbon nanofibers were comprehensively reviewed as capable carriers for a broad spectrum of functional materials such as metal oxides, zeolite, graphene and graphene oxide (GO), and metal-organic frameworks (MOFs) in the application of dye removal. The various nanostructures, adsorption capacity, advantages, and drawbacks were discussed along with mechanistic actions in the adsorption process and photocatalytic performance that emphasize current research development, opportunities, and challenges. The chapter covers multiple intriguing topics with in-depth discussion and is a valuable reference for researchers who are working on nanomaterials and the treatment of colored waters.

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Insights into the mechanism of cationic dye adsorption on activated charcoal: The importance of π–π interactions

Cited by 274 publications

References 40 publications

Adsorption of Chloramphenicol on Commercial and Modified Activated Carbons

Adsorption of Chloramphenicol on Commercial and Modified Activated Carbons

Synthesis and Characterization of Magnetic CoFe1.9Cr0.1O4 Nanoparticles by Sol-gel Method and Their Applications as an Adsorbent for Water Treatment

Composite Nanofibers: Recent Progress in Adsorptive Removal and Photocatalytic Degradation of Dyes

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