Determination of thermodynamic parameters of Cr(VI) adsorption from aqueous solution onto Agave lechuguilla biomass

Romero-González, Jaime; Peralta-Videa, José R.; Rodríguez, Edgar Charry; Ramirez, Susana; Gardea‐Torresdey, Jorge L.

doi:10.1016/j.jct.2004.09.013

Cited by 188 publications

(116 citation statements)

References 21 publications

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“…The removal efficiency of the adsorbent was reduced from 78.7% to 44.8%. This reduction in percent removal may be due to the presence of co-metal ions and dyes present in industrial effluents [31][32][33][34][35][36][37].…”

Section: Industrial Feasibility Of Adsorbentmentioning

confidence: 99%

Equilibrium and Kinetic Parameters Determination of Cr(VI) Adsorption by Hogla Leaves (Typha elephantina Roxb.)

Moniruzzaman¹,

Rahman²,

Aktar³

et al. 2017

Int J Waste Resour

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Section: Industrial Feasibility Of Adsorbentmentioning

confidence: 99%

Equilibrium and Kinetic Parameters Determination of Cr(VI) Adsorption by Hogla Leaves (Typha elephantina Roxb.)

Moniruzzaman¹,

Rahman²,

Aktar³

et al. 2017

Int J Waste Resour

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“…The negative values of ∆G 0 illustrate that the spontaneous nature of this adsorption process was observed in the range of temperature studied (293 K-308 K). In addition, the values of ∆H 0 and ∆S 0 were calculated from the slope and intercept of the plot between lnKc and 1/T ( Figure 19) [66]. The positive value of ∆H 0 implies that the adsorption of MG onto nZVZ is an endothermic process.…”

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

Modeling of Malachite Green Removal from Aqueous Solutions by Nanoscale Zerovalent Zinc Using Artificial Neural Network

Ruan

Shi

et al. 2017

Applied Sciences

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Abstract:The commercially available nanoscale zerovalent zinc (nZVZ) was used as an adsorbent for the removal of malachite green (MG) from aqueous solutions. This material was characterized by X-ray diffraction and X-ray photoelectron spectroscopy. The advanced experimental design tools were adopted to study the effect of process parameters (viz. initial pH, temperature, contact time and initial concentration) and to reduce number of trials and cost. Response surface methodology and rapidly developing artificial intelligence technologies, i.e., artificial neural network coupled with particle swarm optimization (ANN-PSO) and artificial neural network coupled with genetic algorithm (ANN-GA) were employed for predicting the optimum process variables and obtaining the maximum removal efficiency of MG. The results showed that the removal efficiency predicted by ANN-GA (94.12%) was compatible with the experimental value (90.72%). Furthermore, the Langmuir isotherm was found to be the best model to describe the adsorption of MG onto nZVZ, while the maximum adsorption capacity was calculated to be 1000.00 mg/g. The kinetics for adsorption of MG onto nZVZ was found to follow the pseudo-second-order kinetic model. Thermodynamic parameters (∆G 0 , ∆H 0 and ∆S 0 ) were calculated from the Van't Hoff plot of lnKc vs. 1/T in order to discuss the removal mechanism of MG.

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“…Kinetics of Cd (II) adsorption on the orange peel was analyzed using pseudo first-order, pseudo secondorder, Elovich and intra particle diffusion kinetic models [18,19].…”

Section: Adsorption Dynamics Studymentioning

confidence: 99%

Adsorption of Cadmium onto Orange Peels: Isotherms, Kinetics, and Thermodynamics

Mahmoud¹,

Halwany²

2014

J Chromatogr Sep Tech

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Batch adsorption of Cd (II) onto orange peel, a residue of the fruits processing industry, has been studied. Equilibrium isotherms, kinetic data, and thermodynamic parameters have been evaluated. Equilibrium data fit well with Langmuir isotherm model. The kinetic data were found to follow the pseudo-second-order model. The negative ΔHº value indicates the exothermic nature of the adsorption process. Orange peel was shown to be a promising adsorbent for Cd (II) removal from aqueous solutions. α Initial adsorption rate (mg of Cd (II)/g adsorbate. min); Keywords:

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Determination of thermodynamic parameters of Cr(VI) adsorption from aqueous solution onto Agave lechuguilla biomass

Cited by 188 publications

References 21 publications

Equilibrium and Kinetic Parameters Determination of Cr(VI) Adsorption by Hogla Leaves (Typha elephantina Roxb.)

Equilibrium and Kinetic Parameters Determination of Cr(VI) Adsorption by Hogla Leaves (Typha elephantina Roxb.)

Modeling of Malachite Green Removal from Aqueous Solutions by Nanoscale Zerovalent Zinc Using Artificial Neural Network

Adsorption of Cadmium onto Orange Peels: Isotherms, Kinetics, and Thermodynamics

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