Calculation of the adsorption isotherm from solution on a nonporous adsorbent according to the adsorption isotherms of the components from the gas phase

1973 ◽  
Vol 22 (1) ◽  
pp. 1-4 ◽  
Author(s):  
B. P. Bering ◽  
V. V. Serpinskii ◽  
S. I. Surinova
Keyword(s):  
Adsorption Isotherm ◽  
Gas Phase ◽  
Adsorption Isotherms

scholarly journals A Statistical Approach to Determine Optimal Models for IUPAC-Classified Adsorption Isotherms

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4565 ◽  
Author(s):  
Rahman ◽  
Muttakin ◽  
Pal ◽  
Shafiullah ◽  
Saha
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Isotherms ◽  
Fossil Fuels ◽  
Information Criterion ◽  
Single Type ◽  
Average Error ◽  
Type I ◽  
Bootstrap Sampling ◽  
Selection Probability ◽  
Type Iv

Adsorption heat transformation (AHT) systems can play a major role in protecting our environment by decreasing the usage of fossil fuels and utilizing natural and alternative working fluids. The adsorption isotherm is the most important feature in characterizing an AHT system. There are eight types of International Union of Pure and Applied Chemistry (IUPAC) classified adsorption isotherms for different “adsorbent-adsorbate” pairs with numerous empirical or semi-empirical mathematical models to fit them. Researchers face difficulties in choosing the best isotherm model to describe their experimental findings as there are several models for a single type of adsorption isotherm. This study presents the optimal models for all eight types of isotherms employing several useful statistical approaches such as average error; confidence interval (CI), information criterion (ICs), and proportion tests using bootstrap sampling. Isotherm data of 13 working pairs (which include all eight types of IUPAC isotherms) for AHT applications are extracted from literature and fitted with appropriate models using two error functions. It was found that modified Brunauer–Emmet–Teller (BET) for Type-I(a) and Type-II; Tóth for Type-I(b); GAB for Type-III; Ng et al. model for Type-IV(a) and Type-IV(b); Sun and Chakraborty model for Type-V; and Yahia et al. model for Type-VI are the most appropriate as they ensure less information loss compared to other models. Moreover; the findings are affirmed using selection probability; overall; and pairwise proportion tests. The present findings are important in the rigorous analysis of isotherm data.

Prediction of gas-phase adsorption isotherms using neural nets

2002 ◽  
Vol 80 (3) ◽  
pp. 506-512 ◽  
Author(s):  
Sukanta Basu ◽  
Paul F. Henshaw ◽  
Nihar Biswas ◽  
Hon K. Kwan
Keyword(s):  
Gas Phase ◽  
Adsorption Isotherms ◽  
Neural Nets ◽  
Gas Phase Adsorption

The Dissociation Equilibrium of Hydrogen and its Adsorption on Tungsten

1936 ◽  
Vol 32 (1) ◽  
pp. 152-157 ◽  
Author(s):  
J. K. Roberts
Keyword(s):  
Adsorption Isotherm ◽  
Statistical Method ◽  
Gas Phase ◽  
Approximation Formula ◽  
Dissociation Equilibrium ◽  
First Approximation ◽  
Adsorbed Atoms ◽  
Detailed Interpretation ◽  
Rate Of Evaporation ◽  
Detailed Balancing

The various processes occurring at the surface when hydrogen is adsorbed on tungsten are considered together with the dissociation equilibrium of hydrogen in the gas phase. The form of the adsorption isotherm is deduced from the principle of detailed balancing and is in agreement with that obtained by Fowler using a statistical method. A detailed interpretation of the experimental results now available shows that either (a) measurements of the rate of removal of the adsorbed film of oxygen on tungsten do not measure the rate of evaporation of oxygen atoms or (b) it is not possible to obtain a general first approximation formula giving the rate of evaporation of adsorbed atoms in terms of the heat of desorption. The desorption of hydrogen from tungsten is discussed and it is shown that the agreement between the temperature at which the film evaporates at an appreciable rate and that deduced from a desorption formula of the type mentioned in (b) assuming that the hydrogen evaporates as atoms must at present be regarded as a coincidence.

BET Adsorption Isotherm and Surface Heterogeneity

1992 ◽  
Vol 57 (6) ◽  
pp. 1201-1209
Author(s):  
Lydia Ethel Cascarini de Torre ◽  
Eduardo Jorge Bottani
Keyword(s):  
Distribution Function ◽  
Adsorption Isotherm ◽  
Statistical Mechanics ◽  
Adsorption Isotherms ◽  
Surface Heterogeneity ◽  
Adsorption Energies ◽  
Multilayer Formation ◽  
Effect Of Surface

The BET adsorption isotherm is modified in order to take account of surface heterogeneity. The adsorption isotherm is obtained following the statistical mechanics formalism, proposed by Steele, and the effect of surface heterogeneity is limited to the first layer. A Gaussian adsorption energies distribution function is used to describe surface heterogeneity. The variations of the C parameter, multilayer formation and the inversion of adsorption isotherms are analysed.

scholarly journals Modeling of Adsorption Isotherms of Caffeine onto Groundnut Shell as a Low Cost Adsorbent

2020 ◽  
Vol 8 (3) ◽  
pp. 1191-1195
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Isotherms ◽  
Adsorption Equilibrium ◽  
Low Cost ◽  
Emerging Pollutants ◽  
Linear Forms ◽  
Equilibrium Data ◽  
Groundnut Shell ◽  
Modeling Of Adsorption ◽  
Adsorption Equilibrium Data

Caffeine is a chemical compound that has been detected in the environment and belongs to some of the most popular emerging pollutants that may cause serious environmental and human health problems. In this study, the adsorption of caffeine on groundnut shell as low cost adsorbent was investigated using the batch equilibrium method. Three adsorption isotherms namely the Langmuir, Freundlich and Redlich–Peterson isotherms in their non-linear forms were applied to the adsorption equilibrium data. Both the Langmuir and Redlich–Peterson models were found to fit the adsorption isotherm data well. The retention of caffeine on the groundnut shell showed a relatively significant adsorption with a maximal quantity of 4.21 mg g-1. The present study showed that the powdered groundnut shell is a promising and alternative adsorbent for the removal of caffeine from aqueous solutions.

The Investigation of Dyeing Properties of Anion Modified Linen Fibers

2012 ◽  
Vol 535-537 ◽  
pp. 1605-1608 ◽  
Author(s):  
Shu Zhen Gao ◽  
Qun Liu
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Isotherms ◽  
Sodium Periodate ◽  
Langmuir Adsorption Isotherm ◽  
Sodium Bisulfite ◽  
Cationic Dyes ◽  
Dyeing Properties ◽  
Langmuir Adsorption

Linen fibers oxidated by sodium periodate were anion-modified with sodium bisulfite, and treated linen fibers were dyed with cationic dyes. The thermodynamics principle of dyeing on modified linen fibers has been investigated by means of drawing adsorption isotherms,calculating dyeing saturation value and measuring dyeing levelness. The results indicate that adsorption isotherm of dyeing modified linen fibers with cationic dyes belongs to Langmuir adsorption isotherm,and the levelness of modified linen fabrics was better, the results indicate that the function of modification agent on linen fibers were more comprehensive and balanced.

Removal of Azo Dyes from Aqueous Solution by Composite HKUST-1/GO

Nano LIFE ◽  
2015 ◽  
Vol 05 (03) ◽  
pp. 1542003 ◽  
Author(s):  
Qiong Yi ◽  
Ling Li ◽  
Lu Fan ◽  
Keke Sun ◽  
Lebao Mao ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Adsorption Isotherm ◽  
Removal Efficiency ◽  
Adsorption Isotherms ◽  
Azo Dyes ◽  
Freundlich Isotherm ◽  
Dyes Removal

The adsorption of three kinds of azo dyes from aqueous solution on HKUST-1/graphene oxide (GO) composite was studied in view of the removal efficiency, adsorption isotherm, and regenerate of the sorbent. HKUST-1/GO was found to be with higher dyes removal efficiency than HKUST-1. All the adsorption isotherms of azo dyes on HKUST-1/GO composite followed Freundlich isotherm. The adsorbed azo dyes on HKUST-1/GO could be eluted by acetone, so HKUST-1/GO can also be used for enrichment of azo dyes as adsorbent.

Performance of mesoporous silicas (MCM-41 and SBA-15) and carbon (CMK-3) in the removal of gas-phase naphthalene: adsorption capacity, rate and regenerability

RSC Advances ◽  
2016 ◽  
Vol 6 (25) ◽  
pp. 21193-21203 ◽  
Author(s):  
Yingshu Liu ◽  
Ziyi Li ◽  
Xiong Yang ◽  
Yi Xing ◽  
Chuenjinn Tsai ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Gas Phase ◽  
Adsorption Isotherms ◽  
Mesoporous Silicas ◽  
Column Tests ◽  
Mcm 41

The adsorption isotherms of gas-phase naphthalene on mesosilicas MCM-41 and SBA-15, and mesocarbon CMK-3 were determined by column tests at 125 °C, with feed concentrations ranging from 7.63 × 10−5 to 4.64 × 10−2 mol m−3 (1.88 to 1140 ppm).

Sign in / Sign up

Export Citation Format

Share Document