Kinetics of Chromium(VI) and Cadmium Retention in Soils; a Nonlinear Multireaction Model

Amacher, Michael C.; Selim, H. M.; Iskandar, Isdaryanto

doi:10.2136/sssaj1988.03615995005200020017x

Cited by 91 publications

(39 citation statements)

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“…where S = concentration of chromium retained by adsorbent, mg/kg or mol/kg, C = concentration of chromium in solution, mg/L or mol/L, K is a curve fitting parameter for equilibrium model, b is a stoichiometric coefficient [15].…”

Section: Langmuir Isothermmentioning

confidence: 99%

Thermodynamic Properties of Chromium (III) Ion Adsorption by Sweet Orange (<i>Citrus sinensis</i>) Peels

Ugbe¹,

Pam²,

Ikudayisi³

2014

AJAC

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The adsorption of Cr (III) ion from aqueous solution using orange peels as adsorbent was investigated using batch equilibrium technique. The research is significant as it's aimed at investigating the suitability of orange peel, a waste product as adsorbent for the adsorption of Cr (III) ions from aqueous solution. Orange peel as an adsorbent is resource-saving and has an environmental friendly behavior. Adsorption envelope experiment was conducted using a constant Cr (III) ion concentration of 0.1 M, adsorbent dose of 2.5 g and a temperature of 30˚C at varying solution pH of 2, 4, 7, 9 and 12 respectively with pH of 2 having the highest adsorption and therefore it was selected for use in the adsorption isotherm experiment. Adsorption isotherm experiment was conducted at varying temperatures (30˚C, 40˚C, 50˚C, 60˚C), concentration (0.1 M, 0.2 M and 0.3 M) Cr(NO3)3. Thermodynamic parameters such as ∆G, ∆H, ∆Hr, ∆A, and ∆S were calculated from the experimental data which showed that the adsorption process is feasible, spontaneous and followed physisorption mechanism 9H 2 O and adsorbent dosage (1 g, 1.5 g and 2 g) respectively. The experimental results were tested using Langmuir, Freundlich, Linear and Temkin adsorption isotherm models. The experimental data best fitted the Freundlich isotherm model. The experimental results revealed the suitability of orange peel which is a waste product as effective adsorbent for the sorption of chromium (III) ions from aqueous solution.

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Section: Langmuir Isothermmentioning

confidence: 99%

Thermodynamic Properties of Chromium (III) Ion Adsorption by Sweet Orange (<i>Citrus sinensis</i>) Peels

Ugbe¹,

Pam²,

Ikudayisi³

2014

AJAC

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“…Where f (r i ) is the calculated frequency at radius r i , y i is the observed frequency and n is the number of points in the measured frequency distribution (Amacher et al 1988;Šimůnek and Hopmans 2002).…”

Section: Regression Analysismentioning

confidence: 99%

Using radius frequency distribution functions as a metric for quantifying root systems

Scanlan

Hinz

2010

Plant Soil

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Root radius frequency distributions have been measured to quantify the effect of plant type, environment and methodology on root systems, however, to date the results of such studies have not been synthesised. We propose that cumulative frequency distribution functions can be used as a metric to describe root systems because (1) statistical properties of the frequency distribution can be determined, (2) the parameters for these can be used as a means of comparison, and (3) the analytical expressions can be easily incorporated into models that are dependent upon root geometry. We collated a database of 96 root radii frequency distributions and botanical and methodology traits for each distribution. To determine if there was a frequency distribution function that was best suited to root radii measurements Responsible Editor: we fitted the exponential, Rayleigh, normal, lognormal, logistic and Weibull cumulative distribution functions to each distribution in our database. We found that the log-normal function provided the best fit to these distributions and that none of the distribution functions was better or worse suited to particular shapes. We derived analytical expressions for root surface and volume and found that they are a valid, and simpler method for incorporating root architectural traits into analytical models. We also found that growth habit and growth media had a significant effect on mean root radius.

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“…6(a). Cr(VI) concentrations in wells located on the downstream side (in wells [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] are shown in Fig. 6(b).…”

Section: Two Injection Wellsmentioning

confidence: 99%

“…Many earlier studies on the fate and transport of Cr(VI) in aquifers focussed on understanding the interplay between the advection, dispersion, adsorption and geo-chemical processes [15][16][17][18]. Only a few studies have been conducted in the past which considered combined transport and biotransformation of hexavalent chromium.…”

Section: Introductionmentioning

confidence: 99%

Pilot scale studies on the remediation of chromium contaminated aquifer using bio-barrier and reactive zone technologies

Jeyasingh

Somasundaram

Philip

et al. 2011

Chemical Engineering Journal

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Kinetics of Chromium(VI) and Cadmium Retention in Soils; a Nonlinear Multireaction Model

Cited by 91 publications

References 0 publications

Thermodynamic Properties of Chromium (III) Ion Adsorption by Sweet Orange (<i>Citrus sinensis</i>) Peels

Thermodynamic Properties of Chromium (III) Ion Adsorption by Sweet Orange (<i>Citrus sinensis</i>) Peels

Using radius frequency distribution functions as a metric for quantifying root systems

Pilot scale studies on the remediation of chromium contaminated aquifer using bio-barrier and reactive zone technologies

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Kinetics of Chromium(VI) and Cadmium Retention in Soils; a Nonlinear Multireaction Model

Cited by 91 publications

References 0 publications

Thermodynamic Properties of Chromium (III) Ion Adsorption by Sweet Orange (&lt;i&gt;Citrus sinensis&lt;/i&gt;) Peels

Thermodynamic Properties of Chromium (III) Ion Adsorption by Sweet Orange (&lt;i&gt;Citrus sinensis&lt;/i&gt;) Peels

Using radius frequency distribution functions as a metric for quantifying root systems

Pilot scale studies on the remediation of chromium contaminated aquifer using bio-barrier and reactive zone technologies

Contact Info

Product

Resources

About

Thermodynamic Properties of Chromium (III) Ion Adsorption by Sweet Orange (<i>Citrus sinensis</i>) Peels

Thermodynamic Properties of Chromium (III) Ion Adsorption by Sweet Orange (<i>Citrus sinensis</i>) Peels