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Journal ArticleDOI

The kinetics of sorption of divalent metal ions onto sphagnum moss peat

15 Feb 2000-Water Research (WATER RESEARCH)-Vol. 34, Iss: 3, pp 735-742
TL;DR: In this paper, a pseudo-second order rate equation describing the kinetics of sorption of divalent metal ions onto sphagnum moss peat at different initial metal ion concentrations and peat doses has been developed.
About: This article is published in Water Research.The article was published on 2000-02-15. It has received 2658 citations till now. The article focuses on the topics: Sorption & Metal ions in aqueous solution.
Citations
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Journal ArticleDOI
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


Cites background from "The kinetics of sorption of divalen..."

  • ...Although there are many factors which influence the adsorption capacity, including the initial adsorbate concentration [12,48–51], the reaction temperature [10,12,50], the solution pH value [52,53], the adsorbent particle size [48] and dose [12,48,51], and the nature of the solute [12,54], a kinetic model is concerned only with the effect of observable parameters on the overall rate....

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  • ...The rate of the second-order eaction may be dependent on the amount of divalent metal ions n the surface of the peat, and the amount of divalent metal ons adsorbed at equilibrium [9,12]....

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Journal ArticleDOI
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

Journal ArticleDOI
TL;DR: The present review highlights the necessity for the examination of biosorbents within real situations, as competition between solutes and water quality may affect the biosorption performance.

1,584 citations


Cites background from "The kinetics of sorption of divalen..."

  • ...The initial solute concentration seems to have impact on biosorption, with a higher concentration resulting in a high solute uptake (Ho and McKay, 1999b; Ho and McKay, 2000; Binupriya et al., 2007a)....

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Journal ArticleDOI
Hui Qiu1, Lu Lv1, Bingcai Pan1, Qingjian Zhang1, Weiming Zhang1, Quanxing Zhang1 
TL;DR: Several widely-used adsorption kinetic models are reviewed and it is believed that the review is of certain significance and improvement for adsorptive kinetic modeling.
Abstract: Adsorption is one of the most widely applied techniques for environmental remediation. Its kinetics are of great significance to evaluate the performance of a given adsorbent and gain insight into the underlying mechanisms. There are lots of references available concerning adsorption kinetics, and several mathematic models have been developed to describe adsorption reaction and diffusion processes. However, these models were frequently employed to fit the kinetic data in an unsuitable or improper manner. This is mainly because the boundary conditions of the associated models were, to a considerable extent, ignored for data modeling. Here we reviewed several widely-used adsorption kinetic models and paid more attention to their boundary conditions. We believe that the review is of certain significance and improvement for adsorption kinetic modeling.

1,339 citations


Cites background from "The kinetics of sorption of divalen..."

  • ...In addition, the adsorption follows the Langmuir equation ( Ho and McKay, 2000 )....

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Journal ArticleDOI
Yuh-Shan Ho1
TL;DR: Results show that the non-linear method may be a better way to obtain the desired parameters of the pseudo-second-order kinetic model for the sorption of cadmium onto ground-up tree fern.

1,173 citations


Cites background from "The kinetics of sorption of divalen..."

  • ...Although there are many factors which influence the sorption capacity, including the initial sorbate concentration (Ho et al., 2004; Ho and McKay, 2000, 2003), the reaction temperature (Ho et al., 2004; Ho and McKay, 2000), the solution pH value (Ho et al., 1994, 1995), the sorbent particle size…...

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  • ...Moreover, decreasing the tree fern dose enhanced the initial sorption rate, a result counter to that of the sorption of lead by peat (Ho and McKay, 2000)....

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  • ...…the pseudo-second-order rate based on the solid capacity has been presented for the kinetics of sorption of divalent metal ions onto peat (Ho, 1995; Ho and McKay, 2000): qt ¼ q2ekt 1þ qekt , (1) where k is the pseudo-second-order rate constant (g/mg min), qe is the amount of cadmium ion sorbed at…...

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  • ...…intercept2/slope h ¼ 1/slope qt vs. qt/t qe ¼ intercept k ¼ 1/(intercept slope) h ¼ intercept/slope qt/t vs. qt qe ¼ intercept/slope k ¼ slope2/intercept h ¼ intercept et al., 2002; Ho and McKay, 2000), a kinetic model is concerned only with the effect of observable parameters on the overall rate....

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  • ...…capacity, including the initial sorbate concentration (Ho et al., 2004; Ho and McKay, 2000, 2003), the reaction temperature (Ho et al., 2004; Ho and McKay, 2000), the solution pH value (Ho et al., 1994, 1995), the sorbent particle size (Ho and McKay, 2003) and dose (Ho and McKay, 2000,…...

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References
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01 Jan 1898

4,868 citations


"The kinetics of sorption of divalen..." refers methods in this paper

  • ...Traditionally, the kinetics have been described by the ®rst-order equation typical of that derived by Lagergren (1898)....

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Journal ArticleDOI
TL;DR: In this article, the batch adsorption of Ni(II) onto sphagnum moss peat has been studied, and the reaction was pH dependent, the optimum range being 4.0-7.0.

409 citations

Journal ArticleDOI
TL;DR: In this article, it was shown that sphagnum moss peat, which is essentially oligotrophic, in concentrations ranging from 4 to 40 g/l can be used effectively to remove hexavalent chromium from aqueous solutions.

369 citations

Journal ArticleDOI
TL;DR: In this article, the kinetics and thermodynamics of batch metal removal reactions by 50 g/l (dry wt) eutrophic or oligotrophic peat particles using Cu 2+, Cd 2÷, Zn 2 ÷ and Ni 2 ǫ concentrations ranging from 0.01 to 100 mM were presented.

246 citations


"The kinetics of sorption of divalen..." refers methods in this paper

  • ...However, Gosset et al. (1986), Sharma and Forster (1993) as well as Ho et al....

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  • ...However, Gosset et al. (1986), Sharma and Forster (1993) as well as Ho et al. (1995) have used a second-order equation to describe metal±peat sorption and Tien and Huang (1991) have presented a second-order expression for metal sorption onto sludge solids....

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Journal ArticleDOI
TL;DR: In this article, the capacity of peat to treat two different landfill leachates was determined, and the efficiency of treatment was evaluated as a function of factors important for developing filter design criteria.
Abstract: In this investigation, the capacity of peat to treat two different landfill leachates was determined. Freundlich isotherms showed that, for the tested metals (Cd, Cr, Cu, and Pb), an increased time of contact increased the level of adsorption over the entire range of influent values studied. In addition, metal interaction may play an important role in the adsorption of metals from leachate, as the various metal ions compete for the available adsorption sites on the peat. Column studies using two leachates, one from a municipal refuse fill (Al, Ca, Cd, Fe, Mg, Na, and Pb), and one from a fill which receives mainly oil and fly ash (Al, Ca, Cr, Fe, Mg, Mn, Na, Pb, and V), were conducted to establish design parameters for full-scale design. The efficiency of treatment was evaluated as a function of factors important for developing filter design criteria. Further considerations were given to filter longevity and ease of replacement, as well as for the ultimate disposal of the peat from the filters. For the municipal leachate a compaction density of 0.12 g mL−1 gave the best results as clogging occurred at higher densities, whereas 0.18 g mL−1 provided the best removal for the industrial leachate. While peat is incapable of adequately removing metals to acceptable levels for direct discharge, peat can provide substantial removal as a pretreatment process at low hydraulic loadings. Desorption of up to 50% was found when deionized water was applied to spent columns so ultimate disposal of the peat would require a dry environment.

90 citations