A kinetic study of dye sorption by biosorbent waste product pith (original) (raw)
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The batch kinetic sorption of copper ions and dyes onto two low-cost biosorbents, peat and pith, has been studied. A model, based on the assumption of a pseudo-second-order mechanism, has been developed to predict the rate constant of sorption, the equilibrium capacity and initial sorption rate with the effect of initial concentration, particle size, temperature and sorbent concentration dose. An activation energy of sorption has also been evaluated as 7.13 kJ/mol for the sorption of BB69 onto pith.
American Journal of Chemical Engineering, 2014
Low-cost bare palm branches were prepared as a sorbent for methylene blue dye from aqueous solution. The effect of reaction parameters such as sorbent dose and its particle size, initial dye concentration and the medium temperature were investigated using a batch sorption technique. Additionally, the maximum saturated monolayer sorption capacity of bare palm branches for methylene blue dye was investigated. The isotherm data was well-described by the Freundlich equation. Based on the adsorption capacity, it was shown that the use of bare palm branches was a promising low-cost agriculture waste material for the adsorption of dyes from aqueous solutions. Kinetic parameters of adsorption such as the rate constant and the intra-particle diffusion rate constant were determined. The principal conclusions of the study were that the reaction follows the pseudo-second order reaction kinetics.
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Sorption experiments are carried out using sewage sludge for the removal of basic dye basic red-12 from aqueous solution. Effects of process parameters such as initial pH, adsorbent dosage, initial dye concentration, contact time and effect of temperature are investigated. The biosorbent is characterized by FTIR, SEM and XRD. The adsorption of dye is pH dependent. The rate of sorption increases with increase in temperature, and the process is found to be endothermic. Equilibrium is established in 120 min. The pseudo first-order equation, pseudo second-order equation and intraparticle diffusion models are tested. The results showed that the process followed pseudo first order equation very well and intraparicle diffusion plays an important role in the sorption process. The Langmuir and Freundlich equations are applied to the data related to adsorption isotherm and the observed maximum adsorption capacity was found to be 295.85 mg/g. Thermodynamic parameters; ΔH°, ΔG°and ΔS° are also ...
Kinetic Model for the Immobilised Biosorbents: Uptake of Cationic Dyes
A sorption kinetic model has been developed using concept of Chemically Active Available Binding Sites (CAABS). Dead "Fomitopsis carnea" immobilized on polyvinyl alcohol (PVA) matrix has been employed as the immobilized sorbent. Safranin O and Alcian Blue are the representative sorbates. Results indicate that CAABS model described the kinetics with high degree of correlation coefficient (R 2 ≥ 0.99) for under different environmental conditions, viz., mixing speed (60, 200 and 500 revolutions per minutes), and biosorbent doses. Student's t-test also revealed that the predicted data using Chemically Active Available Binding Sites (CAABS) model were significantly correlated with the experimental data. The CAABS model was also compared with well known kinetic models such as Lagergren's model (First order kinetic model ), Single resistance model, Pore diffusion model, and Pseudo-second order kinetic model. The comparative study of these models also confirmed high efficacy of the CAABS model to depict the experimental data.
An assessment and characterization for biosorption efficiency of natural dye waste
The local natural dyeing house run by a women's self-help group was generating a huge amount of dye extracted pulp. We thought of using this pulp for an alternative use other than just composting it. This biomaterial was found to be excellent heavy metal adsorbents and was demonstrated to be very effective in remediation of groundwater and surface water of chrome metals in contaminated sites of tannery operations. In this article, sorption efficacy studies were carried out on selected biomaterials known for their potential usage as natural dyes. Canna indica flower, Portulaca olecera flower and stem, Hibiscus rosa sinensis flower and Trapa natans fruit skin (exocarp) were used for sorption studies. These plant parts, after the extraction of natural dye, were dried and evaluated for biosorption of heavy metal from effluent. Batch tests indicated that hexavalent chromium sorption capacity (q e ) followed the sequence q e (Trapa) >q e (Hibiscus) >q e (Portulaca) >q e (Canna). Due to high sorptive capacity, Trapa fruit skin (exocarp) was selected. The optimization studies were carried out by taking the Trapa exocarp in powdered form, and of particular mesh size. Sorption kinetic data have shown first order reversible kinetic model for all the sorbents, however the biosorption of chromium by T. natans biomass occurred in two stages. In the first stage, 95% sorption was reported for Chromium (VI) in 15 min followed by a slower second stage. It reached equilibrium in 1 h at which 90e98% of the Chromium (VI) was biosorbed by T. natans. Experimentally reported equilibrium data fitted well with both the Langmuir and Freundlich Isotherms. The FT-IR, XRD and XPS analysis showed that the main mechanism of Chromium (VI) biosorption onto Trapa dried powder was through the binding of Chromium ions with amide group of the biomass.
Equilibrium Sorption of Cationic Dye From Aqueous Solution Using Low-Cost Agriculture Waste
The International Conference on Chemical and Environmental Engineering, 2014
Bare palm fibre was investigated for its ability to perform as a suitable sorbent for methylene blue dye from aqueous solution. The effect of sorbent dose and temperature was investigated using a batch sorption technique. The results revealed the potential of palm fibre, an agricultural waste, as a low-cost sorbent for the dye examined. The isotherm data were closely fitted to the Langmuir and Frendlich equations and the dye sorption capacity of palm increased as the sorbent dose decreased. Maximum saturated monolayer sorption capacity of bare palm branches for methylene blue dye was investigated. Reaction parameters such as change in particle size of the sorbent material, sorbent mass, air flow rate, initial dye concentration and the medium temperature were also evaluated. In addition, relationships between sorbent dose and Langmuir; Frendlich constants were developed and are presented. The principal conclusions of the study are that the reaction follows the pseudo first order reaction kinetics.
Isotherms, kinetics and thermodynamics of dye biosorption by anaerobic sludge
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Experiments were conducted to investigate the adsorption characteristics of dyes by anaerobic sludge in this study. Influence of dye type, sorption time, initial dye concentration, sludge concentration and temperature on dye biosorption was evaluated. Furthermore, the isotherms, kinetics and thermodynamic of biosorption were also explored. Experimental results show that anaerobic sludge had a much higher equilibrium adsorption density on Rhodamine B than on Eosin Y. The adsorption density of Rhodamine B onto sludge decreased with enhancing sludge concentration. At a lower Rhodamine B concentration, adsorption could reach saturation in a lower sludge concentration. Results also indicate that both Langmuir and Freundlich adsorption models were able to adequately describe the biosorption equilibrium of Rhodamine B onto anaerobic sludge. The biosorption followed the pseudo second-order adsorption kinetics.
ERJ. Engineering Research Journal, 2015
Bare palm fibre was investigated for its ability to perform as a suitable sorbent for methylene blue dye from an aqueous solution. The effect of sorbent dose and temperature was investigated using a batch sorption technique. The results revealed the potential of palm fibre, an agricultural waste, as a low-cost sorbent for the dye examined. The isotherm data were closely fitted to the Langmuir and Frendlich equations and the dye sorption capacity of palm increased as the sorbent dose decreased. Maximum saturated monolayer sorption capacity of bare palm branches for methylene blue dye was investigated. Reaction parameters such as change in particle size of the sorbent material, sorbent mass, air flow rate, initial dye concentration and the medium temperature were also evaluated. In addition, relationships between sorbent dose and Langmuir; Frendlich constants were developed and are presented. The principal conclusions of the study are that the reaction follows the pseudo first order reaction kinetics.
Kinetic models for the sorption of dye from aqueous solution by wood
Trans. IChemE, 1998
T he sorption of Basic Blue 69 and Acid Blue 25 onto wood has been studied in terms of pseudo-second order, intraparticle diffusion and pseudo-Ūrst order chemical sorption processes. The batch sorption model, based on the assumption of a pseudo-second ...