Adsorption of anionic dyes from aqueous solution on fly ash

Sun, Dongfa; Zhang, Xiaodong; Wu, Yude; Liu, Xin

doi:10.1016/j.jhazmat.2010.05.015

Cited by 294 publications

(96 citation statements)

References 25 publications

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“…The removal of Reactive Red 23, Reactive Blue 171, Acid Black 1, and Acid Blue 193 from aqueous solution on fly ash was studied [58]. The experimental results showed that the removal of dyes on fly ash was pH-dependent, higher initial dye concentration enhanced the adsorption capacity and the adsorption reaction was spontaneous and endothermic in nature.…”

Section: Sorption Processmentioning

confidence: 99%

Dye Waste Treatment

Ong

Keng

Lee

et al. 2011

Water

112

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Dye wastes represent one of the most problematic groups of pollutants because they can be easily identified by the human eye and are not easily biodegradable. This literature review paper highlights and provides an overview of dye waste treatments performed over the three years period from 2008-2010. Noteworthy processes for the treatment of dye waste include biological treatment, catalytic oxidation, filtration, sorption process and combination treatments.

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Section: Sorption Processmentioning

confidence: 99%

Dye Waste Treatment

Ong

Keng

Lee

et al. 2011

Water

112

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“…However, the predominant adsorption mechanisms were chemisorption for anionic dyes and physisorption for disperse dye (Noroozi et al 2008). This chemisorption mechanism of anionic dye may be due to complexation between the negatively charged groups (D-SO 3-) in anionic dyes and positively charged SiO 2 or Al 2 O 3 groups on the surface of FA (pH pzc = 8.4) (Bulut et al 2008;Sun et al 2010).…”

Section: Desorption Of Dyes In the Single And Binary Solutionmentioning

confidence: 99%

Kinetic mechanism of competitive adsorption of disperse dye and anionic dye on fly ash

Sun

Zhang

Wu³

et al. 2012

Int. J. Environ. Sci. Technol.

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The adsorption behavior of four anionic dyes and one disperse dye in single solution and binary solutions on fly ash was investigated in order to elucidate the effect of competitive adsorption on the kinetics. The experimental findings showed that adsorption equilibriums of four anionic dyes were reached within 50 min either in the single solution or in binary mixtures. Competitive adsorption increased the time of attaining equilibrium of disperse dye. Desorption of dyes suggested the predominant adsorption mechanisms, that is, chemisorption for anionic dyes and physisorption for disperse dye. For the binary mixtures, the anionic dyes could be adsorbed preferentially on fly ash at the first stage. Second-order kinetic models fitted better to the equilibrium data of all dyes in the single solution as well as in the binary mixtures. The maximum rate constant of intraparticle diffusion and the minimum external mass transfer coefficient was found for disperse dye both in single and in binary solutions. The intraparticle diffusion constants and external mass transfer coefficients of the four anionic dyes in binary solution are similar to those obtained in single solution. The Biot number confirmed that the intraparticle diffusion was the rate-limiting step in the dye sorption process.

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“…Their removal from water streams is therefore a major environmental concern, since azo dyes are harmful both to humans and to the aquatic life [1,7]. Being recalcitrant to natural degradation, several technologies have been developed for remediation of both streams and wastewaters, including photocatalytic degradation [6,[8][9][10][11], advanced oxidation processes [12][13][14][15][16][17][18], adsorption [19][20][21][22][23], ion flotation [24], and sedimentation [25]. Unfortunately, physicochemical treatments are often expensive, and biological approaches are typically slow and poorly efficient [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Role of pH in the Aqueous Phase Reactivity of Zerovalent Iron Nanoparticles with Acid Orange 7, a Model Molecule of Azo Dyes

Freyria

Esposito

Armandi

et al. 2017

Journal of Nanomaterials

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The effect of both pH and surface oxidation of nanoparticles is studied on the interaction between a commercial slurry of Nanoscale Zerovalent Iron (NZVI) and the azo dye Acid Orange 7 (AO7). NZVI is a reducing agent used for the degradation of several pollutants, including azo dyes: during pollutant degradation, it undergoes progressive oxidation and dissolution. Though it is generally acknowledged that NZVI consists of core-shell nanoparticles, where the core of metallic iron is covered by Fe O shell, it still remains a poorly defined system. In this work, the solid fraction recovered by filtration and drying was characterized by means of XRD diffraction with Rietveld refinement, N 2 isotherms at 77 K, FE-SEM and TEM observation, EDX analysis, and IR spectroscopy. Powders were obtained from both the parent slurry and the same slurry pretreated with HCl in order to remove Fe O shell, finally reactivating the nanoparticles. The aforementioned physicochemical characterization allowed figuring out some correlations between the properties of the studied nanomaterial and the processes occurring when it is in contact with AO7 in aqueous phase. The type of interaction occurring within the NZVI/AO7 system (adsorption and type of redox reactions) strongly depends not only on the pH of the starting solution, but also on the surface oxidation of the nanoparticles.

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Adsorption of anionic dyes from aqueous solution on fly ash

Cited by 294 publications

References 25 publications

Dye Waste Treatment

Dye Waste Treatment

Kinetic mechanism of competitive adsorption of disperse dye and anionic dye on fly ash

Role of pH in the Aqueous Phase Reactivity of Zerovalent Iron Nanoparticles with Acid Orange 7, a Model Molecule of Azo Dyes

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