Modeling of a Diffusion-Sorption Experiment by Linear and Nonlinear Sorption Isotherms

1990 ◽  
Vol 92 (3) ◽  
pp. 363-373 ◽  
Author(s):  
Paul A. Smith
Keyword(s):  
Sorption Isotherms ◽  
Sorption Experiment ◽  
Nonlinear Sorption ◽  
Linear And Nonlinear

Linear and nonlinear sorption modelling for adsorption of atrazine onto activated peanut husk

2016 ◽  
Vol 36 (2) ◽  
pp. 348-358 ◽  
Author(s):  
Ajoy Saha ◽  
Debarati Bhaduri ◽  
Ashvin Pipariya ◽  
Rakesh Kumar Ghosh
Keyword(s):  
Nonlinear Sorption ◽  
Linear And Nonlinear

Sorption of Cd2+, K+, F–, and Cl– on some tropical soils

2003 ◽  
Vol 40 (3) ◽  
pp. 629-642 ◽  
Author(s):  
Adilson do Lago Leite ◽  
Antenor Braga Paraguassú ◽  
R Kerry Rowe
Keyword(s):  
Sorption Isotherms ◽  
Tropical Soils ◽  
Regression Analyses ◽  
Southeastern Part ◽  
Experimental Isotherm ◽  
Clayey Material ◽  
Highly Sensitive ◽  
Sandy Aquifer ◽  
Linear And Nonlinear ◽  
Retention Parameters

The potential for the retention of K+, Cd2+, F–, and Cl– by lateritic soils from the Botucatu (an important sandy aquifer in the southeastern part of Brazil) and Serra Geral (a clayey material) formations and three mixtures of these soils is examined. Batch equilibrium results are presented for both single salt (CdCl2 and KF) and multiple salt (CdCl2 + KF) solutions. The soil retention parameters are obtained by fitting sorption models (linear, Freundlich, and Langmuir) to the experimental isotherm plots using linear and nonlinear regression analyses. The results show that the so called varying soil:solution ratio isotherms (VSI) are in fact less variant in terms of pH than constant soil:solution isotherms (CSI). However, because of restrictions related to the VSI approach and the "soil solution ratio effect," the CSI approach is considered to be a more reasonable way of constructing sorption isotherms. It is shown that under certain conditions, the Cl– anion can be sorbed while for others it is not sorbed. Sorption was observed for F– and K+. The sorption of Cd2+ is also shown to be highly sensitive to leachate chemistry. It is shown that a knowledge of pH0 is quite important for the interpretation of sorption data.Key words: sorption, inorganic chemicals, isotherms, tropical soils.

Description of Simazine Transport with Rate-Limited, Two-Stage, Linear and Nonlinear Sorption

1995 ◽  
Vol 31 (4) ◽  
pp. 811-822 ◽  
Author(s):  
Thilo Streck ◽  
Nicholas Poletika ◽  
William A. Jury ◽  
Walter J. Farmer
Keyword(s):  
Two Stage ◽  
Nonlinear Sorption ◽  
Linear And Nonlinear

scholarly journals Study of Isothermal, Kinetic, and Thermodynamic Parameters for Adsorption of Cadmium: An Overview of Linear and Nonlinear Approach and Error Analysis

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Fozia Batool ◽  
Jamshed Akbar ◽  
Shahid Iqbal ◽  
Sobia Noreen ◽  
Syed Nasir Abbas Bukhari
Keyword(s):  
Error Analysis ◽  
Sorption Isotherms ◽  
Industrial Effluents ◽  
Kinetic Studies ◽  
Sorption Process ◽  
Sorption Data ◽  
Kinetic And Thermodynamic Parameters ◽  
Pseudo Second Order ◽  
Linear And Nonlinear ◽  
Isothermal Kinetic

Reports about presence and toxicity of Cd2+ in different chemical industrial effluents prompted the researchers to explore some economical, rapid, sensitive, and accurate methods for its determination and removal from aqueous systems. In continuation of series of investigations, adsorption of Cd2+ onto the stem of Saccharum arundinaceum is proposed in the present work. Optimization of parameters affecting sorption potential of Cd2+ including pH, contact time, temperature, sorbent dose, and concentration of sorbate was carried out to determine best suited conditions for maximum removal of sorbate. To understand the nature of sorption process, linear and nonlinear forms of five sorption isotherms including Freundlich and Langmuir models were employed. Feasibility and viability of sorption process were evaluated by calculating kinetics and thermodynamics of the process, while error analysis suggested best fitted sorption model on sorption data. Thermodynamic studies demonstrated exothermic nature of reaction, while kinetic studies suggested pseudo-second order of reaction.

scholarly journals Multireaction Modeling of Lead (Pb) and Copper (Cu) Sorption/Desorption Kinetics in Different Soils

Soil Systems ◽  
2019 ◽  
Vol 3 (2) ◽  
pp. 38
Author(s):  
Tamer A. Elbana ◽  
H. Magdi Selim
Keyword(s):  
Sorption Isotherms ◽  
Langmuir Equation ◽  
Sorption Behavior ◽  
Desorption Kinetics ◽  
Alkaline Soils ◽  
Nonlinear Sorption ◽  
Wide Range ◽  
Desorption Hysteresis ◽  
Insight Into ◽  
Different Soils

Batch kinetic experiments were carried out to quantify and describe the sorption/desorption of Cu and Pb in ten soils that exhibited a wide range of properties. Sorption isotherms were quantified using the Langmuir equation, whereas modeling of sorption/desorption kinetics was described using multireaction model (MRM). Results revealed the nonlinear sorption behavior of Cu and Pb in all soils. The ten soils exhibited higher affinity to Pb (6.4 to 36.5 mmol kg−1) in comparison to Cu (3.6 to 22.4 mmol kg−1). Simulation of Cu and Pb kinetic data indicated that the rate of sorption reaction was two orders of magnitude higher than the rate of release. Considering one irreversible site in addition to one-reversible kinetic site improved the estimation of rates of reaction for both Cu and Pb in acidic and alkaline soils. All soils exhibited sorption/desorption hysteresis where Pb-releases ranged between <0.2% and 14.4% of the total sorbed. The respective Cu releases ranged from <0.85% and 23.4%. The multireaction model, which was successful in describing Cu and Pb for all ten soils, provided insight into the processes of sorption/desorption of Cu and Pb in all soils.

scholarly journals Sulfamethoxazole sorption in eutrophic Regolithic Neosol

2018 ◽  
Vol 22 (7) ◽  
pp. 506-510
Author(s):  
Márcia A. M. F. de Barros ◽  
Antônio C. D. Antonino ◽  
Alexandre R. P. Schuler ◽  
José R. de S. Lima ◽  
Manuella V. S. Gondim ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Organic Matter ◽  
High Performance ◽  
Sorption Isotherms ◽  
Sorption Kinetics ◽  
Sorption Experiment ◽  
Batch Method ◽  
Order Model ◽  
Analytical Curve ◽  
Kinetics And Isotherms

ABSTRACT This study aimed to evaluate sulfamethoxazole sorption kinetics and isotherms using batch method. The experiment was carried out in typic eutrophic Regolithic Neosol (0-20 and 20-60 cm layers) located in the private reserve of the Riacho do Papagaio farm, in São João, PE, Brazil. The tests were carried out under laboratory conditions at 24 ºC and sulfamethoxazole concentration was determined by high-performance liquid chromatography. The sorption experiment through the batch method used sulfamethoxazole solutions with concentrations of 10-3, 5.10-4, 10-4, 5.10-5, 10-5 and 5.10-6 mol L-1 to obtain the analytical curve. For this soil, sulfamethoxazole sorption kinetics was best described by a second-order model and the sorption isotherms were linear. Sulfamethoxazole predominantly interacts with organic matter in this type of soil. The results obtained in this study show that the antibiotic sulfamethoxazole exhibits low adsorption, posing a higher risk of contamination to the groundwaters in this region at pH ≈ 7.

scholarly journals Lindane sorption and desorption behaviour on sediment organic matter

2013 ◽  
Vol 78 (6) ◽  
pp. 883-895 ◽  
Author(s):  
Jelena Trickovic ◽  
Ivana Ivancev-Tumbas ◽  
Marijana Kragulj ◽  
Miljana Prica ◽  
Dejan Krcmar ◽  
...  
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Sorption Isotherms ◽  
Sediment Organic Matter ◽  
Sorption Coefficient ◽  
Freundlich Model ◽  
Nonlinear Sorption ◽  
Soils And Sediments ◽  
Desorption Hysteresis ◽  
Physical Conformation

The work is concerned with the sorption and desorption behaviour of lindane on four humic acid fractions (HAs) and two humin fractions, sequentially extracted from Ludas lake sediment. All sorption isotherms, fitted to a Freundlich model, were nonlinear. The isotherm linearity increased from 0.757 for the first extracted HA to 0.944 for the ninth HA showing a positive correlation with atomic H/C ratio, while a negative correlation between sorption coefficient and aliphaticity of the isolated HAs was observed. It has been shown that the sorption processes may be strongly influenced by the physical conformation of and accessibility to sediment organic matter (SOM), as demonstrated by high Koc and low n values of humin samples. Despite exhibiting the most nonlinear sorption isotherms, humin samples did not show a pronounced sorption-desorption hysteresis, while the most significant hysteresis was observed for three HA samples. These results support the hypothesis that the aromatic domains in SOM influence strongly the sorption and desorption behaviour of lindane. Our findings may be helpful in understanding the distribution, transport and fate of lindane in soils and sediments.

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