Pseudo-second order model for sorption processes
TL;DR: In this paper, a literature review of the use of sorbents and biosorbents to treat polluted aqueous effluents containing dyes:organics or metal ions has been conducted.
About: This article is published in Process Biochemistry.The article was published on 1999-07-01. It has received 13746 citations till now. The article focuses on the topics: Sorption.
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TL;DR: An overview of second-order kinetic expressions is described in this paper based on the solid adsorption capacity, which shows that a pseudo-second-order rate expression has been widely applied to the Adsorption of pollutants from aqueous solutions onto adsorbents.
3,458 citations
TL;DR: An extensive list of various adsorbents such as natural materials, waste materials from industry, agricultural by-products, and biomass based activated carbon in the removal of various dyes has been compiled here.
2,979 citations
TL;DR: The biosorbents widely used for heavy metal removal were reviewed, mainly focusing on their cellular structure, biosorption performance, their pretreatment, modification, regeneration/reuse, modeling of biosor adaptation (isotherm and kinetic models), the development of novel biosorbent, their evaluation, potential application and future.
2,281 citations
01 Aug 2004
TL;DR: The theoretical results (derived equations) show that the observed rate constants of pseudo-first-order and pseudo-second-order models are combinations of adsorption and desorption rate constants and also initial concentration of solute.
Abstract: The kinetics of sorption from a solution onto an adsorbent has been explored theoretically. The general analytical solution was obtained for two cases. It has been shown that at high initial concentration of solute (sorbate) the general equation converts to a pseudo-first-order model and at lower initial concentration of solute it converts to a pseudo-second-order model. In other words, the sorption process obeys pseudo-first-order kinetics at high initial concentration of solute, while it obeys pseudo-second-order kinetics model at lower initial concentration of solute. The theoretical results (derived equations) show that the observed rate constants of pseudo-first-order and pseudo-second-order models are combinations of adsorption and desorption rate constants and also initial concentration of solute. The obtained theoretical equations are used to correlate experimental data for sorption kinetics of some solutes on various sorbents. The predictions of the theory are in excellent agreement with the experimental data.
1,860 citations
TL;DR: In this article, a review examines a wide variety of microorganisms (fungi, yeasts, bacteria, etc.), which are capable of uptake of organic pollutants, discusses various mechanisms involved in biosorption, discusses the effects of various parameters such as pH, temperature, concentrations of organic pollutant, other ions, and biomass in solution, pretreatment method, etc.
1,825 citations
References
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TL;DR: The possible use of Giru clay, from Nigeria as an adsorbent for the removal of lead from water was investigated in this article, as a function of contact times, concentrations, temperatures and pH.
Abstract: The possible use of kaolinitic clay, Giru clay, from Nigeria as an adsorbent for the removal of lead from water was investigated Studies were carried out as a function of contact times, concentrations, temperatures and pH The kinetics of adsorption as well as adsorption isotherms at different temperatures were equally studied The results show that lead removal is favoured by low concentration, high temperature and acidic pH The reasons for these observations are adduced
146 citations
"Pseudo-second order model for sorpt..." refers background in this paper
...[69] Hydrous zirconium oxide Pb(II) 1st order Kaolinitic clay Orumwense [70] 1st order Ramelow et al....
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TL;DR: In this paper, the ability of a homogeneous mixture of fly ash and wollastonite (1:1) to remove Cr(V1) from aqueous solutions by adsorption was investigated.
Abstract: The ability of a homogeneous mixture of fly ash and wollastonite (1:1) to remove Cr(V1) from aqueous solutions by adsorption has been investigated. The extent of removal is dependent on concentration, pH and temperature of the solution. The applicability of the Langmuir isotherm for the present system has been tested and the surface mass transfer coefficient at 30°C and pH 2.0 determined. Maximum removal was observed at pH 2.0 and 30°C. The adsorption is first governed by diffusion followed by surface compound formation. The thermodynamic parameters, desorption results and infrared studies indicated that the surface compounds, formed by interaction of adsorbate ions and different constituents of mixed adsorbent, were stable in nature.
140 citations
TL;DR: In this paper, an attempt has been made to fractionate cellulose triacetate employing the adsorption technique using the Langmuir isotherm indicating that the polymer molecules behave as rigid molecules in the adorbed state.
140 citations
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TL;DR: In this article, the removal of Congo Red was carried out using biogas waste slurry as an adsorbent at different concentrations of dye and dosage, agitation time and pH.
Abstract: Removal of Congo Red was carried out using biogas waste slurry as adsorbent at different concentrations of dye, adsorbent dosage, agitation time and pH. The process follows the first-order rate expression. The equilibrium data fit well in the Freundlich model of adsorption. Maximum removal of dye, 95%, was observed in the pH range 2.3–9.4. Desorption of Congo Red showed that it is solubilised in 50% acetic acid to the extent of 6% and the remainder appears to be chemically complexed irreversibly to the adsorbent. Low desorption of dye from the adsorbent surface in water indicates that the process may not be, essentially, a reversible one.
137 citations
136 citations
"Pseudo-second order model for sorpt..." refers background in this paper
...[62] Moss and Copper-coated moss 2nd order Fernadez et al....
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