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: A lanthanum-impregnated silica gel has been developed for the removal of fluoride, phosphate, and arsenate ions by adsorption as discussed by the authors, which was applied for removing these anions from synthetic and high-tech industrial wastewaters.
Abstract: A lanthanum-impregnated silica gel has been developed for the removal of fluoride, phosphate, and arsenate ions by adsorption The interaction between silica gel and lanthanum ion was maximum at a final pH of 6 The removal of fluoride and arsenate ions by adsorption on the lanthanum-impregnated silica gel was more than 99 9% at neutral pH from initial concentration of 055 and 02 mmol/L, respectively The removal of phosphate ion was 95% at an initial concentration of 05 mmol/L at neutral pH Arsenite ion was not adsorbed on the material The rate of adsorption of the anions followed the first-order reaction and fit in the Lagergren equation The adsorption of each anion followed the Langmuir isotherm Other anions such as Cl{sup -}, BR{sup -}, I{sup -}, NO{sub 3}{sup -}, and SO{sub 4}{sup 2-} did not interfere with the adsorption A column study was conducted for the removal of these anions at a fixed flow rate of 05 mL/min at pH approximately 7 These anions were removed by more than 999% at initial first or second fraction, and the column was regenerated at pH 85 The method was applied for the removal of these anions from synthetic and high-tech industrial wastewatersmore » 30 refs, 8 figs, 1 tab« less
217 citations
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...[74] Lanthanum-impregnated silica gel Wasay et al....
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TL;DR: In this paper, the authors investigated the kinetics of lead sorption on peat and developed a batch sorption model, based on the assumption of a pseudo-second order mechanism, to predict the rate constant of sorption, the equilibrium capacity and initial sorption rate.
Abstract: The kinetics of lead sorption on to peat have been investigated. The batch sorption 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 lead(II) concentration, peat particle size and temperature. An equilibrium capacity of sorption has been evaluated with the pseudo-second order rate equation. In addition, an activation energy of sorption has also been determined based on the pseudo-second order rate constants.
215 citations
TL;DR: In this article, the authors used activated carbon prepared from peanut hull (PHC), an agricultural waste byproduct, for the adsorption of Cu(II) from aqueous solution.
202 citations
"Pseudo-second order model for sorpt..." refers background in this paper
...[21] Peanut hull carbon Periasamy and Namasi1st order Cu(II) vayam [73] F, P and As(V) 1st order Wasay et al....
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TL;DR: In this paper, the potential of the biomass of non-living, dried, roots of water hyacinth (Eichhornia crassipes) to remove two basic dyes, methylene blue and Victoria blue, from aqueous solutions were conducted.
200 citations
"Pseudo-second order model for sorpt..." refers background or methods in this paper
...The same first pseudo-order model was used for the sorption of dyes, such as the sorption of Omega Chrome Red ME (OCRME) using a 1:1 ratio of fly ash and coal [9], and the sorption of Methylene Blue on water hyacinth roots [10]....
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...[10] Water hyacinth roots Cr(III) and Cr(VI) 1st order Lee et al....
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TL;DR: In this article, the ability of fly ash to remove fluoride from water and wastewaters has been studied at different concentrations, times, temperatures and pH of the solution, and the rate constants of adsorption, intraparticle transport, mass transfer coefficients and thermodynamic parameters have been calculated at 30, 40, and 50 °C.
Abstract: The ability of fly ash to remove fluoride from water and wastewaters has been studied at different concentrations, times, temperatures and pH of the solution. The rate constants of adsorption, intraparticle transport, mass transfer coefficients and thermodynamic parameters have been calculated at 30, 40, and 50 °C. The empirical model has been tested at various concentration for the present system. The removal of fluoride is favorable at low concentration, high temperature and acidic pH.
192 citations
"Pseudo-second order model for sorpt..." refers background in this paper
...[46] Fly ash Floride CN 2nd order Peat Cancela et al....
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