Batch and column studies on biosorption of acid dyes on fresh water macro alga Azolla filiculoides

Padmesh, T.V.N.; Vijayaraghavan, K.; Sekaran, G.; Velan, M.

doi:10.1016/j.jhazmat.2005.05.014

Cited by 194 publications

(89 citation statements)

References 30 publications

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“…It is observed that the increase in flow rate results in a reduction in both breakthrough points and saturation times, thus corroborating with the literature (Padmesh et al, 2005;Aksu et al, 2007) and experimental observations ( Table 2). The shape of metal ion concentration profiles at the column outlet proved to bequite similar for the two simulated conditions; however, the greater the slope of the curve, the higher the feed flow rate.…”

Section: Resultssupporting

confidence: 91%

Mathematical modeling of manganese adsorption onto bone char in a continuous fixed bed column incorporating backmixing and shriking core approaches

Maria

Mansur

2017

Braz. J. Chem. Eng.

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-The present study investigated the dynamics of manganese adsorption onto bone char in a continuous fixed bed column using a mathematical model that incorporates: (i) the backmixing model to describe the fluid flow through the bed and (ii) the shrinking core model to describe the kinetic and mass transfer phenomena within spherical adsorbent particles. The proposed model consists of an ordinary differential equation system. Hydrodynamic, kinetic and diffusive parameters were determined by fitting the mathematical model to the experimental data obtained by Sicupira et al. (2015). For the operating conditions evaluated in this study, the intraparticle diffusion represented the controlling step of the adsorption process (Bi m > 3.8). The increase in the feed rate of the column (3.0-7.5 mL min -1 ) and the decrease in the height of the bed (8-16 cm) resulted in a decrease in the time required for the saturation of the column bed. The model is flexible for a variety of flow conditions and adequately reproduced the behavior of the manganese adsorption process in the fixed bed column operation (R²> 0.99) with an average percentage error less than15%.

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Section: Resultssupporting

confidence: 91%

Mathematical modeling of manganese adsorption onto bone char in a continuous fixed bed column incorporating backmixing and shriking core approaches

Maria

Mansur

2017

Braz. J. Chem. Eng.

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“…However, the higher dosage of biosorbent in the solution, the greater the availability of active sites for AO7, leading to the higher AO7 removal. The results obtained were similar and supported by other researchers (19,26). One of the most important factors affecting the biosorption of AO7 on dried Rice Stem was the acidity of the solution, since the PH of the dye solution influences not only the surface charge of the biosorbent and the dissociation of functional groups of the active sites on the surface of the biosorbent, but also the aqueous chemistry of the dye.…”

Section: Ijhs 2014; 2(1): 59supporting

confidence: 88%

“…Then the sample was centrifuged at 3600 rpm for 10 minutes. Finally, the residual concentrations were measured using Spectrophotometer (DR2800) in λ max of 452 nm (19,29). The amount of adsorbed TCP was calculated according to the following Eq 1(30).…”

Section: Batch Adsorptionmentioning

confidence: 99%

“…Among the mentioned techniques, the adsorption is one of the most effective and low-cost method for the dyes removal from aqueous solutions (17,18). One of the problems in using of the activated carbon is the its high cost; therefore, many studies have tried to search for alternative materials, which are relatively inexpensive, and at the same time with reasonable adsorptive efficiency (19,20) . Many studies have been made on use of different adsorbents like activated carbon, peat, coir pith, chitin, silica, fly ash, and many others like hardwood sawdust, bagasse pith, paddy straw, slag, lemna minor, Azolla, various blends of these (21)(22)(23)(24).…”

Section: Introductionmentioning

confidence: 99%

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Removal of Acid Orang 7(AO7) Dye from Aqueous Solution by Using of Adsorption on to Rice Stem Waste: Kinetic and Equilibrium Study

Tilaki¹,

Balarak

Ghasemi

2014

Iran J Health Sci

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Background and purpose: dye is widely used in industries such as cosmetic, leather, paper and textile and release to the environment via their effluents. The purpose of this study was to compare the efficiency of low-cost adsorbents in acid orang 7 dyes removal from water. Materials and Methods:The Rice Stem biomass was sun dried, crushed and sieved to particle sizes in range of 1-2 mm. Then treated with 2.0 mol/L nitric acid for a period of 1 h followed by washing with distilled water and finally washed Stem was dried at 105• in oven. The residues concentration of acid orang 7 dyes was measured by spectrophotometer in λmax of 452 nm. The effect of pH, contact time and initial AO7 dye concentration, kinetic and isotherm models were studied. Then data interpreted and analyzed by Excel 16 software. Results:The pH value of 3, contact time of 75 min, adsorbent dosage of 8 g/L and dye concentration were 10 mg/l determined as optimum conditions for adsorbents. The most acid orang 7 dyes removal efficiency of 98% was obtained for modified Rice Stem in optimum conditions. The equilibrium data is best fitted on Langmuir isotherm and the adsorption kinetic model follows pseudo-second model.Conclusion: Based on data obtained in this study, it can be concluded that adsorption by modified Rice Stem is an efficient and reliable adsorbent for acid orang 7 dyes removal from liquid solutions.

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“…The high fit of the experimental data with the Thomas model indicate that the external and internal diffusion will not be the rate limiting step [9,22]. The breakthrough curve analysis from continuous adsorption studies reveals that the slower breakthrough time reached for lesser initial concentration, slower flow rate, and higher bed height [23,24].…”

Section: Thomas Modelmentioning

confidence: 99%

Fixed Column Study for the Removal of Zinc (II) Ions from Waste Water by Bone Char Rice Husks Ash and Water Hyacinth Composite-Mixture

2016

IJSR

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Abstract:The adsorption potential of animal charcoal (BC/RHA/WH composite mixture to remove Zinc (II) ions from industrial wastewater was investigated using a fixed bed column was investigated. The effects of bed height (2 -10) cm, flow rate (5 -10) ml/min and feed concentration (diluted in the ratio 1:1 and 1:2) on the break through characteristics were determined. The highest bed capacity of 476.2 mg/g mg/g was obtained using 10 cm bed height, 1:2 feed concentration and 5 ml/min flow rate. The results indicate that adsorption capacity increased with increase in the inlet ion concentration and bed height and decreased with increase in flow rate. Adsorption data was fitted to Adam-Bohart, Thomas and Yoon-Nelson models.

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Batch and column studies on biosorption of acid dyes on fresh water macro alga Azolla filiculoides

Cited by 194 publications

References 30 publications

Mathematical modeling of manganese adsorption onto bone char in a continuous fixed bed column incorporating backmixing and shriking core approaches

Mathematical modeling of manganese adsorption onto bone char in a continuous fixed bed column incorporating backmixing and shriking core approaches

Removal of Acid Orang 7(AO7) Dye from Aqueous Solution by Using of Adsorption on to Rice Stem Waste: Kinetic and Equilibrium Study

Fixed Column Study for the Removal of Zinc (II) Ions from Waste Water by Bone Char Rice Husks Ash and Water Hyacinth Composite-Mixture

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