Adsorption of anionic azo dye Congo Red from aqueous solution by Cationic Modified Orange Peel Powder

Munagapati, Venkata Subbaiah; Kim, Dong Su

doi:10.1016/j.molliq.2016.04.119

Cited by 192 publications

(70 citation statements)

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“…The results obtained in this work confirm this statement and suggest the influence of polarization effects on the adsorption of the colored anion studied. Similar results were found by Munagapati et al [57] for the adsorption of Congo red over orange peel, Mokhtari et al [58] for the adsorption of methyl orange on activated carbon impregnated with CuS, Gupta et al [59] for the adsorption of crystal violet and brilliant green on kaolinite. Figure 4 shows that the MF02 samples (without treatment) and MF03 (acid treated) exhibit a lower percentage removal across the pH range studied.…”

Section: Effect Of Solution Ph On Adsorption and Determination Ph Of supporting

confidence: 80%

Eriochrome black adsorption on yellow passion fruit peel (Passiflora edulis f. Flavicarpa) treated with sodium hydroxide and nitric acid: study of adsorption isotherms, kinetic models and thermodynamic parameters

et al. 2019

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The yellow passion fruit peel was used for Eriochrome black adsorption studies in aqueous solution in such a way as to propose a use for this by-product of the Brazilian fruit juice industry. The passion fruit peel was treated with nitric acid and sodium hydroxide to simulate pectin removal conditions and provide surface modifications that enhance adsorption. The kinetics and equilibrium experiments were completed in batch, at room temperature and contact times from 15 to 240 min. The thermodynamic studies were accomplished through a 298-343 K temperature variation. The adsorption capacities ranged from 196 to 303 mg/g, with the NaOH-treated sample having the highest adsorption capacity at all temperatures. This result points out that the passion fruit peel is a promising adsorbent compared with other low-cost adsorbents. The adsorption process is exothermic and occurs with decreasing entropy. The spontaneity of the process is low except for the sample treated with NaOH. Gibbs free energies were − 1.70 kJ/mol for the untreated sample, − 2.55 kJ/ mol for the HNO3-treated sample, and − 6.03 kJ/mol for the NaOH-treated sample at room temperature. The thermodynamic studies have shown that Eriochrome black adsorption on passion fruit peel is a physical process. The process kinetics may be described by the pseudo-second-order model, with diffusion limitations in the solution. The results indicate that NaOH-treated passion fruit peel is a promising adsorbent for Eriochrome black and may be used to adsorb other acid dyes in aqueous medium.Keywords Passion fruit peel · Acid dye adsorption · Low-cost adsorbents · Fruit peel treatment · Modified passion fruit peel · Isotherm comparison Mathematical Subject Classification 92E99 JEL Classification Q250 and Q530

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Section: Effect Of Solution Ph On Adsorption and Determination Ph Of supporting

confidence: 80%

Eriochrome black adsorption on yellow passion fruit peel (Passiflora edulis f. Flavicarpa) treated with sodium hydroxide and nitric acid: study of adsorption isotherms, kinetic models and thermodynamic parameters

et al. 2019

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“…Dye industry is a major pollution generating industry including paper, painting, food processing, cosmetics, hair dye and textile (Yokwana et al 2018;Munagapati and Kim 2016). It was estimated that more than 10,000 dyes are commercially available (Munagapati and Kim 2016). In the last 35 years, India has become a major producer of dyes and pigments in different industries such as textiles, paper, plastics, leather and cosmetics.…”

Section: Introductionmentioning

confidence: 99%

Potentiality of banana peel for removal of Congo red dye from aqueous solution: isotherm, kinetics and thermodynamics studies

2018

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Potentiality of fruit peel (banana peel) was evaluated by adsorption of Congo red (CR) dye from aqueous solution. The adsorption study was performed by varying operating variables such as pH, initial concentration of CR, adsorbent dose, contact time and temperature. The dust of banana peel was characterized by different instrumental techniques such as point of zero charge, scanning electron microscopy and Fourier transformed infrared spectroscopy. The results revealed that the dye adsorption is favorable at higher pH (10). The equilibrium of dye adsorption was assessed by Freundlich and Langmuir isotherm models. Similarly, kinetics of CR adsorptions was assessed by pseudo-first-order and pseudo-second-order kinetics. Results revealed that isotherm and kinetics of dye adsorption fit well with Langmuir isotherm and pseudo-second-order kinetics, respectively. The dye adsorption capacity was recorded as 1.727 mg/g. The thermodynamics of the dye adsorption revealed that the adsorption is thermodynamically favorable, spontaneous and exothermic in nature. The regeneration study suggested that 97.3% dye removal can be achieved by regenerating the spent adsorbent with 0.1 N NaOH solution. Finally, it can be concluded that banana peel could be an efficient adsorbent for removal of Congo red from aqueous medium.

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“…Using the above same method, the activation energies on various adsorptions 33-38 were estimated and the activation energies [40][41][42][43]50 judged to be scientific mistakes were reevaluated (Table 2). 59 .…”

Section: The Estimation Of Activation Energy (E a ) On Several Adsorpmentioning

confidence: 99%

“…Therefore, in previous studies [32][33][34][35][36][37][38] , although the kinetic experimental data at various temperatures were measured and the rate constants were estimated, the activation energies couldn't be calculated (See Table 1). But, the activation energies were calculated in some studies [39][40][41][42][43] using FMOE (fractal-like MOE) 8 or PSO (pseudo-second-order) 2 , these are scientific mistakes.…”

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A New Adsorption Rate Equation in Batch Systems

Hong¹,

Sin²,

Pak³

et al. 2018

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In this paper, the deficiencies and cause of previous adsorption kinetic models were revealed, ne w adsorption rate equation has been proposed and its validities were verified by kinetic analysis of various experimental data. This work is a new vie w on the adsorption kinetics rather than a comment on the previous adsorption papers.Many adsorption kinetic models had been proposed and used during about 120 years. The frequently used and recently established 28 models 1-31 were listed in Table S1. The development of adsorption kinetic model has been conducted to obtain the specific models that agree better with the experimental data, as the result, dozens of kinetic models were established. The most of them were based on the Lagergren model 1 (in 1898) and Langmuir kinetic model 24 (in 1918), there were no innovative development. The Deficiencies and Cause of Previous Adsorption Kinetic ModelsCan those be used for the calculation of activation e nergy? One of the important objectives of kinetic study is to evaluate activation energy. Activation energy is the energy which must be available to a chemical system with potential reactants to result in a reaction. Activation energy is obtained by Arrhenius equation and the rate constants of different temperature.Activation energy can't be evaluated by the many of previous adsorption kinetic models, such as the pseudo-order models [1][2][3][4][12][13][14][15] and its changed types [5][6][7][8][20][21][22][23] . These models involve the adsorption amount q e (No. 1-9 and No. 13-21 in Table S1). When Arrhenius equation is used to calculate activation energy, the rate constants must be a constant at given temperature. However, not only the

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Adsorption of anionic azo dye Congo Red from aqueous solution by Cationic Modified Orange Peel Powder

Cited by 192 publications

References 60 publications

Eriochrome black adsorption on yellow passion fruit peel (Passiflora edulis f. Flavicarpa) treated with sodium hydroxide and nitric acid: study of adsorption isotherms, kinetic models and thermodynamic parameters

Eriochrome black adsorption on yellow passion fruit peel (Passiflora edulis f. Flavicarpa) treated with sodium hydroxide and nitric acid: study of adsorption isotherms, kinetic models and thermodynamic parameters

Potentiality of banana peel for removal of Congo red dye from aqueous solution: isotherm, kinetics and thermodynamics studies

A New Adsorption Rate Equation in Batch Systems

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