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: In this paper, a zeolita tipo cancrinita sodica and nitrada se caracterizaron, previamente, by difraccion of rayos X, area superficial especifica BET, analisisis quimico e infrarrojo con transformada de Fourier.
Abstract: Se sintetizo una zeolita tipo cancrinita sodica y nitrada, y se intercambio con cationes calcio (II), magnesio (II) y hierro (II). Estas zeolitas se caracterizaron, previamente, por difraccion de rayos X, area superficial especifica BET, analisis quimico e infrarrojo con transformada de Fourier. Los datos de DRX confirmaron unicamente la presencia de la fase cancrinita. Otras fases, como la sodalita, no fueron detectadas. Estas zeolitas intercambiadas fueron puestas en contacto con una solucion de glucosa a diferentes masas y tiempos de contacto. Los resultados senalaron que estas cancrinitas modificadas fueron activas para la adsorcion de glucosa, especialmente las zeolitas intercambiadas con Fe, mientras que las cancrinitas intercambiadas con Ca2+, Mg2+ y Na+ mostraron una capacidad de adsorcion mucho mas baja que la cancrinita de Fe. Ademas, los estudios cineticos demostraron que la capacidad de adsorcion de glucosa por estas zeolitas es afectada por la concentracion de glucosa en el medio de reaccion
5 citations
Cites methods from "Pseudo-second order model for sorpt..."
...A pseudo-second order model proposed by Ho and Mckay (Ho and McKay 1999) can be used to explain the sorption kinetics....
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TL;DR: In this paper, treatments of environmental pollutants with biomass-based sustainable materials are catching a lot of attention in the field of sustainable materials, including bio-diesel and renewable energy.
Abstract: Aggravating environmental problems have driven the unprecedented development of sustainable materials. Treatments of environmental pollutants with biomass-based sustainable materials are catching a...
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TL;DR: In this paper, the adsorption ability of the rice husks ash towards Fe(III), Pb(II), Cr(III) and Cu(II) ions in single and multi-component aqueous solutions was studied in a batch system.
Abstract: In the present study agricultural waste (rice husks) was used for the production of biogenic silica. The resulting material was obtained by incineration of rice husks at a temperature of 800°С and was characterized by means of XRD, FTIR, SEM-EDS, Hg-porosimetry and N2-adsorption. The adsorption ability of the rice husks ash towards Fe(III), Pb(II), Cr(III) and Cu(II) ions in single- and multi-component aqueous solutions was studied in a batch system. The effects of contact time, acidity of initial solutions and metal ion concentrations were followed. Different models were used to determine the adsorption mechanism. Equilibrium experimental data were fitted to linear Langmuir and Freundlich models. The maximum adsorption capacities for single- and multi-component adsorption were calculated.
5 citations
Additional excerpts
...The pseudo-first-order([25]) and pseudo-second-order [26] equations are expressed as...
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TL;DR: In this paper, the performance of α-alumina in terms of competitive adsorption has been investigated in a single-and mixed-adsorbate mode, in the presence of adjacent phenolic OH group.
Abstract: Adsorption kinetics of o -hydroxybenzoic acid (salicylic acid) and p -hydroxybenzoic acid, in single-adsorbate and mixed-adsorbate mode, in the pH range 5–8 are reported using α-alumina as an adsorbent. Adsorption isotherms for both the acids are compared in mixed-adsorbate mode. Adsorption densities of both the acids onto α-alumina surface from the mixed-adsorbate mode are lower in comparison to single-adsorbate mode since a competition is generated between two acids for the surface sites. o -Hydroxybenzoic acid is more active for the surface sites in comparison to p -hydroxybenzoic acid due to the presence of adjacent phenolic OH group. Diffuse reflectance infrared Fourier transform (DRIFT) spectra indicate that p -hydroxybenzoic acid forms inner-sphere surface complex onto α-alumina in single- and mixed-adsorbate mode at pH 5 and 8 resulting in dissolution of α-alumina. In contrast coexistence of both outer- and inner-sphere surface complexes of o -hydroxybenzoic acid onto α-alumina at pH 5 and 8 is proposed under single-adsorbate mode that results in lower magnitude of dissolution whereas it is outer-sphere surface complex under mixed-adsorbate mode. In the scope of competitive adsorption we conclude that the dissolution of α-alumina primarily takes place by the type of surface complex formed by p -hydroxybenzoic acid.
5 citations
Cites methods from "Pseudo-second order model for sorpt..."
...3–6) in single- and mixed-adsorbate mode were fitted to the pseudo-second-order kinetic equation of nonlinear form [92,93] of the following form:...
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TL;DR: Turbinaria decurrens immobilized in sodium alginate showed increasing intraparticular diffusion of lead, stability of the metal binding, and affinity for lead as discussed by the authors.
Abstract: Turbinaria decurrens immobilized in sodium alginate showed increasing intraparticular diffusion of lead, stability of the metal binding, and affinity for lead. Equilibrium lead concentrations were attained after 9 h. The maximum lead uptakes were 1.14, 1.35, and 1.79 mmol g−1, respectively, for alginate xerogels, free alga, and immobilized alga. The order of maximum lead uptake for different biosorbents was immobilized alga > free alga > alginate xerogels. Scanning electron microscopy (SEM) and energy dispersive X-ray microanalysis showed a uniform distribution of lead on the alginate surface. Fourier transform infrared spectroscopy (FTIR) showed that the main bands modified after lead uptake were those corresponding to hydroxyl and carboxyl stretching. The immobilized beads could be repeatedly used with high efficiency. T. decurrens immobilized in alginate xerogels constitutes an excellent biosorbent for lead, sometimes surpassing the biosorption performance of alginate alone and even the free alga. SEM micrograph (a) and EDX monograph (b) of immobilized biomass after lead uptake
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"Pseudo-second order model for sorpt..." refers background in this paper
...Chien and Clayton [32] reported that the Elovich equation may be used to describe the kinetics of phosphate sorption in soils....
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Book•
22 Oct 2013TL;DR: The application of chemical kinetics to soil systems is discussed in this paper, where the authors present a model of Inorganic and Organic Reactions in Soils, as well as the mechanisms of Rapid Reactions on Soil Constituents using Relaxation Methods.
Abstract: Introduction. Application of Chemical Kinetics to Soil Systems. Kinetic Methodologies and Data Interpretation for Diffusion-Controlled Reactions. Kinetics and Mechanisms of Rapid Reactions on Soil Constituents Using Relaxation Methods. Ion Exchange Kinetics on Soils and Soil Constituents. Kinetics of Pesticide and Organic Pollutant Reactions. Rates of Chemical Weathering. Redox Kinetics. Kinetic Modeling of Inorganic and Organic Reactions in Soils. Bibliography. Index.
592 citations