Adsorption of anionic azo-dyes from aqueous solutions onto graphene oxide: Equilibrium, kinetic and thermodynamic studies

Konicki, Wojciech; Aleksandrzak, Małgorzata; Moszyński, Dariusz; Mijowska, Ewa

doi:10.1016/j.jcis.2017.02.031

Cited by 374 publications

(155 citation statements)

References 63 publications

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“…Moreover, as shown in Table 2, the magnitude of the adsorption rate constants followed the order: external surface adsorption (k i1 ) > intraparticle diffusion (k i2 ) > equilibrium stage (k i3 ). Thus, it may be concluded that although the initial adsorption rate is controlled by external surface adsorption, after a certain contact time (saturation of binding sites), the adsorption rate is controlled by intraparticle diffusion [33][34][35]. Additionally, the gradual increase in the values of k i1 and k i2 in response to the increased initial concentration of AO7 indicates that MSS-AS has higher adsorption affinity for AO7 at higher initial concentrations as a result of the increased mass transfer rate of the dye molecules.…”

Section: Effect Of Initial Ao7 Concentration and Contact Time: Adsorpmentioning

confidence: 99%

Optimized preparation of activated carbon from municipal sewage sludge and application to the adsorption of azo dye from aqueous solutions

Jung

Lee

2018

Env Prog and Sustain Energy

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In this study, the conditions for preparation of active carbon from municipal sewage sludge (MSS) were optimized from application to the efficient removal of the azo dye, Acid Orange 7 (AO7), from aqueous solutions. To maximize the adsorption capacity (response variable) of the MSS‐derived activated carbon (MSS‐AC), a 3 k Box–Behnken design based on response surface methodology was used to simultaneously optimize five important conditions (independent variables), that is, carbonizing temperature (400–600°C), carbonizing time (0.5–2.0 h), impregnation ratio (1.0–3.5 g KOH/g MSS), activating temperature (600–800°C), and activating time (0.5–2.0 h). The optimal conditions were established as carbonizing temperature: 509°C, carbonizing time: 1.25 h, impregnation ratio: 2.3 g KOH/g MSS, activating temperature: 681°C, and activating time: 1.21 h, with an overall desirability function of 0.991. Further, the effects of various key parameters (solution pH, ionic strength, adsorbent dosage, initial concentration, contact time, and temperature) on the adsorption of AO7 on the as‐synthesized MSS‐AC were elucidated through a series of batch experiments. Adsorption kinetics and isotherm studies revealed that the adsorption process is accurately described by the pseudo‐second order and Sips models. The theoretical maximum adsorption capacity of AO7 was found to be ~1410 mg/g at 25°C, which is superior to that of the other adsorbents reported to date. Additionally, the intraparticle diffusion model suggested that the adsorption was controlled by both external surface adsorption and intraparticle diffusion. Thermodynamic studies also suggested that the adsorption of AO7 by MASS‐AC is exothermic and is governed by physisorption. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S267–S276, 2019

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Section: Effect Of Initial Ao7 Concentration and Contact Time: Adsorpmentioning

confidence: 99%

Optimized preparation of activated carbon from municipal sewage sludge and application to the adsorption of azo dye from aqueous solutions

Jung

Lee

2018

Env Prog and Sustain Energy

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“…Regarding anion adsorption, GO shows practically no activity [10]. Nevertheless, adsorption of anionic azo-dyes are suggested [21], it is possible evidently due to interaction of benzene rings with hydrophobic regions of the carbon material. Hydrophobic porosity have been found experimentally [8][9][10][11]22].…”

Section: Introductionmentioning

confidence: 99%

Composite adsorbents including oxidized graphene: effect of composition on mechanical durability and adsorption of pesticides

Dzyazko¹,

Ogenko²,

Shteinberg³

et al. 2019

Him. Fiz. Tehnol. Poverhni

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A number of multifunctional composite adsorbents based on hydrated zirconium dioxide has been synthesized. The inorganic ion exchanger contained nanosheets of oxidized graphene (GO), the modifier amount was 0.5-7 mass. %. The composites were investigated with methods of transmission electron microscopy and nitrogen adsorption-desorption, macropores were determined using water as a working liquid. It has been found that increasing of GO content depresses microporosity, but meso-and macroporosity grow. Crushing strength reduces exponentially with increase of total pore volume from 0.49 to 0.62 cm 3 g -1 . Removal of phenol from water containing also inorganic ions was investigated. Adsorption capacity reaches 0.15-0.85 (phenol), 0.5-0.85 (Ca 2+ and Mg 2+ ), 0.005-0.045 (SO 4 2-) mmol g -1 . When the GO content in the composites is 0.5-2 %, this carbon addition improves adsorption of cations and organic molecules comparing with hydrated zirconium dioxide. Further increase in GO amount causes no sufficient effect on adsorption due to decline of specific surface area of the composites. It has been suggested that the optimal content of the modifier, which provides the maximal growth of adsorption capacity, is 2 %. This composite is obtained in a form of large granules (0.3-0.5 mm), their crushing strength is 9 bar. The material was applied to removal of pesticides (acetomipride, carboxine, epoxyconazole and thiamethoxam) from aqueous multicomponent solution under batch conditions. The residual content of carboxine and epoxyconazole, molecules of which contain benzene rings, is lower than the maximal allowable concentration. No deterioration of pesticide uptake has been found after five cycles of adsorption-regeneration.

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“…Benzidine-based azo dyes are extensively used in textile, printing, and leather industry (Bandala et al, 2008;Bendjama et al, 2017;IARC 2018). Conventional methods such as filtration, adsorption, membrane processes, and ion exchange have been studied to remove azo dyes (Konicki et al, 2017;Konsowa et al, 2011;Oduor et al, 2008;Shirzad-Siboni et al, 2014). One inconvenience of membrane systems is membrane fouling (Oduor et al, 2008;Shirzad-Siboni et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Soybean Peroxidase‐Catalyzed Treatment of Azo Dyes with or without Fe° Pretreatment

Villegas

Mazloum

Taylor

et al. 2018

Water Environment Research

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Representative azo dyes (Acid Blue 113 [AB113] and Direct Black 38 [DB38]) were treated in a single step with soybean peroxidase (SBP) and hydrogen peroxide (H2O2), or in two steps, zero-valent iron (Fe°) pretreatment followed SBP/H2O2. The purpose of this research was to compare both treatment processes and to determine which one was the optimal for degradation of each azo dye. For AB113, the preferred process was the single-step process, 1.0 mM AB113 required 2.5 mM H2O2, 1.5 U/mL SBP at pH 4.0 for ≥ 95% color and dye removal and 30% total organic carbon (TOC) removal. For DB38, due to the products formed after Fe° reduction, which are enzyme substrates (aniline and benzidine; two of four products) a two-step process was preferred, which allowed reduction in the required SBP and H2O2 concentrations by 5- and 2-fold, respectively, compared to a single-step treatment for ≥ 95% color, dye, and aniline/benzidine removal and 88% TOC removal.

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Adsorption of anionic azo-dyes from aqueous solutions onto graphene oxide: Equilibrium, kinetic and thermodynamic studies

Cited by 374 publications

References 63 publications

Optimized preparation of activated carbon from municipal sewage sludge and application to the adsorption of azo dye from aqueous solutions

Optimized preparation of activated carbon from municipal sewage sludge and application to the adsorption of azo dye from aqueous solutions

Composite adsorbents including oxidized graphene: effect of composition on mechanical durability and adsorption of pesticides

Soybean Peroxidase‐Catalyzed Treatment of Azo Dyes with or without Fe° Pretreatment

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