scholarly journals Linear isotherm regularities of solid sodium under pressure

AIP Advances ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 125114
Author(s):  
Huaming Li ◽  
Hao Ding ◽  
Yanting Tian ◽  
Yongli Sun ◽  
Shiwei Fang
Keyword(s):  
Linear Isotherm

Adsorption of 2,4-dinitrophenol on Activated Carbon Prepared from Cotton Cakes: Non-linear Isotherm Modeling

2018 ◽  
Vol 24 (1) ◽  
pp. 1-20 ◽  
Author(s):  
Bopda Aurelien ◽  
Tchuifon Tchuifon Donald Raoul ◽  
Nche George Ndifor-Angwafor ◽  
Kamdem Tamo Arnaud ◽  
Anagho Solomon Gabche
Keyword(s):  
Activated Carbon ◽  
Isotherm Modeling ◽  
Linear Isotherm ◽  
Non Linear

scholarly journals Non-linear Regression Analysis for the Adsorption Kinetics and Equilibrium Isotherm of Phenacetin onto Activated Carbons

2019 ◽  
pp. 1-18 ◽  
Author(s):  
Christian Sadeu Ngakou ◽  
Gabche Solomon Anagho ◽  
Horace Manga Ngomo
Keyword(s):  
Experimental Data ◽  
Activated Carbon ◽  
Activated Carbons ◽  
Linear Regression Analysis ◽  
Xrd Analysis ◽  
Strong Interactions ◽  
Isotherm Models ◽  
Linear Isotherm ◽  
Non Linear ◽  
Best Fit

Activated carbon obtained from ayous sawdust, Cucurbitaceae (egussi) peelings and the mixture of the two were studied for the adsorption of phenacetin. Characterisation of activated carbon by SEM and XRD analysis shows that the mixture of precursors combine the properties of activated carbon obtained separately. The well-knownbatch sorption models– Langmuir (one and two sites), Freudlich, Tempkin, Elovich, Langmuir-Freudlich, Redlich Peterson, Radke-Prausnitz, Fritz Shlunder)—were tested with experimental data for the adsorption of phenacetin to estimate adsorption equilibrium parameters—rate constantsand adsorption capacities. The model with the best fit was identified from extensive statistical analysis of the results of nonlinear regression of the experimental data. Comparison of the statistical errors in parameter estimation between linear and non-linear isotherm models shows that transformation of non-linear isotherm equations to linear forms implicitly alter their error structure. The much smaller size of the various error indicators —Determination Coefficient, R2; Sum of Square Errors, SSE; Chi Test, χ2; Average Relative Errors, ARE—, calculated for the case of non linearization when compared to linearization, indicate the greater accuracy in the application of non linearization. The Langmuir model (one site) gave the best fit and thus the values of adsorption capacity for each activated carbon were calculated from it. Kinetic models show that weak and strong interactions are involved in the adsorption process and that the controlling mechanism may not be limited to intra particle diffusion. The lower value of the boundary layer thickness in the case of activated carbon obtained from the mixture, justified the higher adsorbed quantity of this activated carbon compared to those of activated carbon from each precursor.

Preparation and Characterization of Anionic Composite Hydrogel for Dyes Adsorption and Filtration: Non-linear Isotherm and Kinetics Modeling

2020 ◽  
Vol 28 (6) ◽  
pp. 1710-1723 ◽  
Author(s):  
Adel Mokhtar ◽  
Soumia Abdelkrim ◽  
Amina Sardi ◽  
Amina Benyoub ◽  
Hadj Besnaci ◽  
...  
Keyword(s):  
Composite Hydrogel ◽  
Kinetics Modeling ◽  
Linear Isotherm ◽  
Non Linear ◽  
Dyes Adsorption

Re-evaluation and reconstruction of water purification system using soil I. Assessment of soil as a sorbent of humic substances and phosphate ion

2004 ◽  
Vol 50 (5) ◽  
pp. 363-367 ◽  
Author(s):  
Y. Fujikawa ◽  
T. Hamasaki ◽  
M. Sugahara ◽  
H. Ozaki ◽  
G. Prasai ◽  
...  
Keyword(s):  
Humic Substances ◽  
Volcanic Ash ◽  
Soil Layer ◽  
Environmental Water ◽  
Phosphate Ion ◽  
Linear Isotherm ◽  
Water Purification System ◽  
Purification System ◽  
Volcanic Ash Soil ◽  
High Sorption

The purpose of our study is to develop a treatment procedure for humic substances (HS hereafter) and phosphate ion in wastewater and environmental water by percolation of the water through a constructed soil layer at the hydraulic loading of a few metres per day. In the present work, batch sorption tests were conducted for more than 80 samples of soil, sludge, mineral and organic materials in order to find good sorbents for fulvic acid (FA hereafter) and phosphate ion. The results showed that the sorption of FA was high for some charcoal, and apatite and goethite minerals. Comparatively high sorption of FA was found for some Andosols and volcanic ash soil. Significant sorption of phosphate ion, on the other hand, was found for various types of soil, sludge from water treatment plants and some waste materials. The linear isotherm was obtained for the sorption of FA to a charcoal, apatite and goethite minerals, and Andosols.

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