Adsorption characteristics of Congo Red on coal-based mesoporous activated carbon

Lorenc-Grabowska, Ewa; Gryglewicz, Grażyna

doi:10.1016/j.dyepig.2006.01.027

Cited by 503 publications

(165 citation statements)

References 35 publications

Supporting

Mentioning

150

Contrasting

Unclassified

Order By: Relevance

“…This capability is dependent on the accessibility of adsorbent pores, and it is particularly relevant for composite materials where polymer coverage of adsorbent particles occurs [107,108]. Dyes such as Congo red (CR) [173][174][175][176][177], methylene blue (MB) [178][179][180][181][182][183] and methyl orange (MO) [184][185][186] are frequently used to study the adsorption capability of adsorbents [187][188][189]. These investigations were focused on the removal or decomposition of toxic, harmful compounds from wastewater using adsorption, catalytic or photocatalytic methods.…”

Section: Equilibrium and Kinetic Adsorptionmentioning

confidence: 99%

“…The adsorption of dyes from an aqueous solution is frequently used to test the adsorption capability of various adsorbents towards toxic aromatic functionalised compounds, which is important for medical and environmental applications [173][174][175][176][177][178][179][180][181][182][183][184][185][186]. This capability is dependent on the accessibility of adsorbent pores, and it is particularly relevant for composite materials where polymer coverage of adsorbent particles occurs [107,108].…”

Section: Equilibrium and Kinetic Adsorptionmentioning

confidence: 99%

See 1 more Smart Citation

Cryogels: Morphological, structural and adsorption characterisation

Gun'ko

Savina

Mikhalovsky

2013

Advances in Colloid and Interface Science

286

205

View full text Add to dashboard Cite

*Graphical Abstract (for review)Cryotripic gelation technique allows the synthesis of solid and soft macroporous gels Textural characterisation of cryogel in native superhydrated state with noninvasive methods Adsorption and diffusion characteristics of macroporous cryogels with respect to macromolecules and cells Theoretical modelling of adsorption from aqueous media *Highlights (for review) Please find the revised manuscript entitled "Cryogels: morphological, structural and adsorption characterisation" by Vladimir M. Gun'ko, Irina N. Savina, Sergey V. Mikhalovsky to re-consider for publication in the "Advances in Colloid and Interface Science"The paper was completely edited and changed according to reviewers comments.Sincerely yours, Prof. V. M. Gun'koCover Letter ABSTRACTExperimental results on polymer, protein, and composite cryogels and data treatment methods used for morphological, textural, structural, adsorption and diffusion characterisation of the materials are analysed and compared. Treatment of microscopic images with specific software gives quantitative structural information on both native cryogels and freeze-dried materials that is useful to analyse the drying effects on their structure. A combination of cryoporometry, relaxometry, thermoporometry, small angle X-ray scattering (SAXS), equilibrium and kinetic adsorption of low and high-molecular weight compounds, diffusion breakthrough of macromolecules within macroporous cryogel membranes, studying interactions of cells with cryogels provides a consistent and comprehensive picture of textural, structural and adsorption properties of a variety of cryogels. This analysis allows us to establish certain regularities in the cryogel properties related to narrow (diameter 0.4 < d < 2 nm), middle (2 < d < 50 nm) and broad (50 < d < 100 nm) nanopores, micropores (100 nm < d < 100 m) and macropores (d > 100 m) with boundary sizes within modified life science pore classification. Particular attention is paid to water bound in cryogels in native superhydrated or freeze-dried states. At least, five states of water -free unbound, weakly bound (changes in the Gibbs free energy G < 0.5-0.8 kJ/mol) and strongly bound (G > 0.8 kJ/mol), and weakly associated (chemical shift of the proton resonance  H = 1-2 ppm) and strongly associated ( H = 3-6 ppm) waters can be distinguished in hydrated cryogels using 1 H NMR, DSC, TSDC, TG and other methods. Different software for image treatment or developed to analyse the data obtained with the adsorption, diffusion, SAXS, cryoporometry and thermoporometry methods and based on regularisation algorithms is analysed and used for the quantitative morphological, structural and adsorption characterisation of individual and composite cryogels, including polymers filled with solid nano-or microparticles.

show abstract

Section: Equilibrium and Kinetic Adsorptionmentioning

confidence: 99%

Section: Equilibrium and Kinetic Adsorptionmentioning

confidence: 99%

Cryogels: Morphological, structural and adsorption characterisation

Gun'ko

Savina

Mikhalovsky

2013

Advances in Colloid and Interface Science

286

205

View full text Add to dashboard Cite

show abstract

“…The second-order kinetic model gave a better fit, the correlation coefficients were higher and the q e values were closer to the experimental ones than those calculated by applying the first order model except in the case of the RF/Coal adsorbent. However, the correlation coeficients were not as good as others found in the literature for the adsorption of CR on mesoporous activated carbons [5,35]. The plots of the linearized form of the second-order kinetic model for the adsorption of CR on different samples are shown in Figure 4 where it can be seen that the pseudo-second order kinetic model provided a good correlation for the adsorption of Congo red.…”

Section: Equilibrium Timementioning

confidence: 86%

“…However, the high mesoporosity of most tyre-derived samples is an advantage for the adsorption of large molecular-size compounds from solution like Congo Red dye [34,35]. Congo Red dye…”

Section: Textural and Surface Chemistry Characterizationmentioning

confidence: 99%

Properties and performance of mesoporous activated carbons from scrap tyres, bituminous wastes and coal

Acevedo

Barriocanal

Lupul

et al. 2015

Fuel

View full text Add to dashboard Cite

Tyre wastes and their blends with coal and a bituminous waste material obtained from the benzol distillation column of a by-product section of a coking plant were employed as a precursor for the production of activated carbons (ACs). Pyrolysis up to 850 °C followed by physical activation with CO 2 produced mesoporous carbons with different pore size distributions and surface areas. The surface chemistry of the samples was studied by measuring the point of zero charge (pH pzc ) and by temperature programmed desorption (TPD). The activated carbons obtained contained higher amounts of basic functional groups. Their textural and surface chemistry characteristics make them highly suitable for adsorbing acid dyes of large molecular size, such as Congo red. The adsorption kinetics was found to conform closely to the pseudo-second-order kinetic model. To determine the adsorption mechanism, the kinetic data were also analysed using the Weber and Morris intraparticle diffusion model and the Boyd model to distinguish between the pore and film diffusion steps. The equilibrium isotherms were of the Langmuir isotherm type. The efficiency of the low-cost ACs prepared for the removal of Congo red dye was similar to that reported in the literature for coal-based ACs and greater than that of other low-cost ACs.

show abstract

“…The result shows that the percentage of dye removal increased with increase in adsorbent dosage. Initially the percentage of dye removal was found to be rapid which slowed down as the adsorbent dose increased [13]. The initial increase in adsorption with increase in amount of adsorbent dose is due to larger driving force and lesser surface area.…”

Section: Effect Of Adsorbent Dosage:-mentioning

confidence: 98%