scholarly journals Modelling of pure CO2 and flue gas sorption data on South African coals using Langmuir, Freundlich, Temkin, and Extended Langmuir isotherm models

2021 ◽  
Author(s):  
Major Mabuza ◽  
Kasturie Premlall ◽  
Michael O. Daramola
Keyword(s):  
Experimental Data ◽  
Adsorption Isotherm ◽  
South African ◽  
Flue Gas ◽  
Langmuir Isotherm ◽  
Goodness Of Fit ◽  
Research Work ◽  
Isotherm Models ◽  
Sorption Data ◽  
Adsorption Data

Abstract Greenhouse gases (GHGs) have sharply increased over the past four decades due to intensifying industrial activities; as a result, the earth has been faced with global warming in which the major contributor is the anthropogenic carbon dioxide (CO 2 ) emissions. Carbon sequestration in unmineable coal seams has been proposed as one of the most attractive technologies to mitigate CO 2 emissions in which CO 2 is stored in the microporous structure of the coal matrix in an adsorbed state. The CO 2 adsorption process is hence considered one of the more effective methodologies in environmental sciences. Thus, adsorption isotherm measurements and modelling are key important scientific measures required in understanding the adsorption system, mechanism, and process optimization in coalbeds. In this paper, three renowned adsorption isotherm models were employed including Langmuir, Freundlich, and Temkin for pure CO 2 adsorption data, and the Extended-Langmuir model for multicomponent, such as flue gas mixture-adsorption data as investigated in this research work. The adsorption data was acquired from a high-pressure volumetric sorption system (HPVSS) experiment involving two South African coal samples from Ermelo and Somkhele coalfields with pure CO 2 and synthetic industrial flue gas to simulate emissions that are representative of a typical coal-fired power plant (12% CO 2 , 5.5% O 2 , 82% N 2 , 0.38% SO 2 , and 0.12% NO 2 ). The adsorption data was measured on 10 g samples with a mean size of 2 mm at temperatures ranging from 30 ºC to 60 ºC and pressure up to 9.0 MPa using the HPVSS. The statistical evaluation of the goodness-of-fit was done using three (3) statistical data analysis methods including correlation coefficient (R 2 ), standard deviation ( σ ), and standard error (SE). The Langmuir isotherm model conventionally fits the pure CO 2 gas experimental data better than Freundlich and Temkin. The Extended Langmuir gives best experimental data fit for the flue gas.

The Water Adsorption Isotherm Models on Activated Alumina

2012 ◽  
Vol 229-231 ◽  
pp. 100-104 ◽  
Author(s):  
Yun Fei Shi ◽  
Xiang Jun Liu ◽  
Hui Jiao Nie ◽  
Yin Shu Liu
Keyword(s):  
Experimental Data ◽  
Water Vapor ◽  
Adsorption Isotherm ◽  
Water Adsorption ◽  
Isotherm Model ◽  
Isotherm Models ◽  
Activated Alumina ◽  
Adsorption Isotherm Models ◽  
Adsorption Data

The adsorption isotherm model of water vapor on activated alumina is an essential equation in designing the performance of adsorption. In this paper, the currently existed 14 isotherm models of water adsorption are summarized. The correlations among these models are analyzed. These isotherm models are evaluated by fitting the water adsorption data on Rhone-Poulenc activated alumina. The results show that AD-Toth, AD-LRC, AD-UNILAN and DMAP can fit the experimental data well.

Pt(IV) Adsorption Characteristics of Nanoporous Carbons Modified with Carboxymethylated Polyethyleneimine

2007 ◽  
Vol 124-126 ◽  
pp. 1781-1784 ◽  
Author(s):  
Yongju Jung ◽  
Jei Won Yeon ◽  
Ji Man Kim ◽  
Hyung Ik Lee ◽  
Seok Kim ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Charge Density ◽  
Langmuir Isotherm ◽  
Isotherm Models ◽  
Nanoporous Carbons ◽  
High Charge ◽  
High Charge Density ◽  
Langmuir Isotherm Model ◽  
Coated Carbon

In this study, we modified the surface of nanoporous carbons with carboxymethylated polyethyleneimine (CM-PEI) of a high charge density in order to increase the Pt loading on the nanoporous carbons in an aqueous solution. We carried out equilibrium adsorption tests of Pt(IV) on the pure nanoporous carbon and the CM-PEI-coated carbons and evaluated the adsorption isotherm on the CM-PEI-coated carbon using various isotherm models. It was found that the adsorption of Pt(IV) onto the CM-PEI-coated carbons obeys the Langmuir isotherm model.

Preparation and Cu(II) Complexation Characteristics of Carboxymethylated Polyethyleneimine (CM-PEI) / Microporous Activated Carbon Composite

2007 ◽  
Vol 119 ◽  
pp. 303-306
Author(s):  
Y. Jung ◽  
Jei Won Yeon ◽  
Yeong Keong Ha
Keyword(s):  
Activated Carbon ◽  
Langmuir Isotherm ◽  
Composite Particle ◽  
Carbon Composite ◽  
Isotherm Model ◽  
Isotherm Models ◽  
Adsorption Data ◽  
Langmuir Isotherm Model ◽  
Adsorption Phenomena ◽  
Element Mapping

We present the preparation and Cu(II) adsorption characteristics of a new and innovative composite which was composed of a carboxymethylated polyethyleneimine (CM-PEI) and an activated carbon with a nanopore less than 2 nm in diameter. In this study, we examined the adsorption phenomena of Cu(II) on the CM-PEI/F400 composite and evaluated the adsorption data using three kinds of isotherm models (Langmuir, Freundlich, and Temkin isotherms). It was found that the adsorption of Cu(II) on the CM-PEI/F400 composite obeys the Langmuir isotherm model. Furthermore, The Cu element mapping results showed that Cu was well distributed throughout all the surface of the composite particle, suggesting that the surface of the F400 particle was uniformly covered with CM-PEI.

The Adsorption on Nano-Fe3O4 of Malachite Green from Aqueous Solution

Nano LIFE ◽  
2015 ◽  
Vol 05 (03) ◽  
pp. 1542005 ◽  
Author(s):  
Lu Fan ◽  
Ling Li ◽  
Keke Sun ◽  
Lebao Mao ◽  
Keke Liang ◽  
...  
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Malachite Green ◽  
Adsorption Kinetics ◽  
Langmuir Isotherm ◽  
High Adsorption ◽  
Isotherm Adsorption ◽  
High Adsorption Capacity ◽  
Nano Fe3o4

The adsorption of malachite green from an aqueous solution of magnetic Fe 3 O 4 was studied in view of the adsorption isotherm, kinetics and regeneration of the sorbent. The adsorption isotherm of MG on nano- Fe 3 O 4 composite followed the Langmuir isotherm. Adsorption kinetics was determined from the experimental data. The nano- Fe 3 O 4 can be recycled for reuse after regeneration through acetonitrile. The high adsorption capacity and excellent reusability made Fe 3 O 4 attractive for the removal of MG from aqueous solution.

scholarly journals Biosorption potentials of acid modified Saccharum bengalense for removal of methyl violet from aqueous solutions

2017 ◽  
Vol 23 (3) ◽  
pp. 399-409 ◽  
Author(s):  
Muhammad Din ◽  
Kiran Ijaz ◽  
Khalida Naseem
Keyword(s):  
Experimental Data ◽  
Adsorption Isotherm ◽  
Aqueous Medium ◽  
Methyl Violet ◽  
Isotherm Models ◽  
Langmuir Adsorption ◽  
First Order ◽  
Adsorption Isotherm Models ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order

In the present work, Saccharum bengalense (SB) was treated with sulfuric acid to enhance its efficiency. Methyl violet (MV), a cationic dye, was removed from aqueous medium using acid modified S. bengalense (A-SB). Different parameters like adsorbent dosage, stirring speed, temperature, contact time and effect of initial concentration of dye on rate of adsorption of dye from aqueous medium was studied. Experimental data obtained from adsorption of MV was analyzed by applying pseudo first order, pseudo second order and intra-particle diffusion models and it was found that the data best follows the pseudosecond order kinetics. Thermodynamic parameters indicate that adsorption reaction was spontaneous, feasible and endothermic in nature. Different adsorption isotherm models, like Langmuir, Freundlich, Dubinin-Radushkevich (D-R) and Temkin, were used to study the mechanism of adsorption process and experimental data was well fitted by the Langmuir adsorption isotherm.

scholarly journals Selective Cu(II) Adsorption from Aqueous Solutions Including Cu(II), Co(II), and Ni(II) by Modified Acrylic Acid Grafted PET Film

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Nazia Rahman ◽  
Nobuhiro Sato ◽  
Satoru Yoshioka ◽  
Masaaki Sugiyama ◽  
Hirotaka Okabe ◽  
...  
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Acrylic Acid ◽  
Metal Ions ◽  
Functional Groups ◽  
Metal Ion ◽  
Second Order ◽  
Isotherm Models ◽  
Adsorption Data ◽  
Pseudo Second Order

Acrylic acid (AAc) grafted polyethylene terephthalate (PET) films were prepared by γ irradiation. The graft films showed little metal ion adsorption due to compact structure of the graft chains as shown by the scanning electron microscopy (SEM) images which restricted the access of metal ions to the functional groups. Therefore, the graft films were modified with KOH treatment for expansion of the graft chains to facilitate the access of metal ions to the functional groups. The modified films were used to study the selective Cu2+ adsorption from aqueous solution containing Cu2+, Co2+, and Ni2+. Langmuir and Freundlich isotherm models were used for interpretation of selective equilibrium adsorption data and Langmuir model showed better fitting with experimental data. Again pseudo-first-order and pseudo-second-order equations were used for interpretation of selective kinetic adsorption data and pseudo-second-order equation showed better prediction of experimental data. The adsorbent film showed high selectivity towards Cu2+ in presence of Cu2+, Co2+, and Ni2+ in the pH range of 1.5 to 4.5. Desorption and reuse of the adsorbent film were also studied which indicated that the film can be used repeatedly for selective Cu2+ sorption from aqueous solution.

Sorption Isotherms of Granny Smith Apples Hot-Air Dried and Texturized by "Controlled Sudden Decompression to the Vacuum"

2007 ◽  
Vol 3 (5) ◽  
Author(s):  
Tarik Iguedjtal ◽  
Nicolas Louka ◽  
Karim Allaf
Keyword(s):  
Surface Area ◽  
Goodness Of Fit ◽  
Gravimetric Method ◽  
Sorption Isotherms ◽  
Moisture Sorption ◽  
Least Square ◽  
Isotherm Models ◽  
Sorption Data ◽  
Sorption Behaviour ◽  
Hot Air

Moisture sorption isotherms of Granny Smith apples hot-air dried and texturized by Controlled Sudden Decompression (Détente Instantannée Contrôlée DIC®) were determined and compared using a gravimetric method. The DIC has been developed to confer a porous structure to partially dehydrated foods by expanding them and facilitating the drying process at lower water content. The samples were stored in a chamber; the relative humidity is controlled by an atomizing humidifier at 20, 30 and 40°C, and relative humidities ranging from 10% to 90%. The sorption capacity decreased with increasing temperature at a given water activity. The hysteresis effect was not significant for both of the dried and texturized apples. The experimental sorption data were fitted to 8 various isotherm models including two parameter relationships (BET, Halsey, Smith, Henderson, Oswin), three parameter equations (Ferro-Fontan, GAB) and four parameter equations (Peleg). A non-linear least square regression software was used to evaluate the model's constants. The goodness of fit of each isotherm was quantified through the mean relative percentage deviation modulus E. The Ferro-Fontan, Peleg, GAB and Oswin equations were best for characterizing the sorption behaviour of Granny Smith apples for a whole range of temperatures and water activities studied. The surface area corresponding to the monolayer was determined for the texturized apples and compared to the dried samples. The results showed that the treatment by DIC increases the surface area of apples. For understanding the water properties and calculating the energy requirements phenomena, net isosteric heat was evaluated by the applying Clausius-Clapeyron equation.

scholarly journals Study of Humic Acid Adsorption Equilibrium on Dual Nanofiber PMMA/PVDF

2018 ◽  
Vol 3 (1) ◽  
pp. 13
Author(s):  
Muhammad Ali Zulfikar ◽  
Afdal Bahri ◽  
Muhamad Nasir
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Humic Acid ◽  
Adsorption Capacity ◽  
Langmuir Isotherm ◽  
Adsorption Equilibrium ◽  
Experimental Results ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity

<p>The main objective of this study is to investigate the isotherm sorption of humic acid (HA) from aqueous solution onto dual nanofiber PMMA/PVDF. Batch adsorption experiments were carried out using HA solution as an adsorbate under variety of concentration in the range of 50-200 mg/L. The experimental data were analyzed by the Langmuir, Freundlich and Sips models of adsorption. The experimental results indicate that, the adsorption capacity of HA adsorption increases with an increase in the HA concentrations. The adsorption of HA onto dual nanofiber PMMA/PVDF agrees well with the Langmuir isotherm models with the maximum adsorption capacity was found to be 137.40 mg g<sup>-1</sup> at concentration of 100 mg L<sup>-1</sup>.</p>

scholarly journals Determination of rice husk activated Carbon capacity in adsorption of Cu Metal from Sasirangan liquid waste based on isotherm model

2022 ◽  
Vol 1212 (1) ◽  
pp. 012019
Author(s):  
I Syauqiah ◽  
D Nurandini ◽  
N P Prihatini ◽  
Jamiyaturrasidah
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Rice Husk ◽  
Langmuir Isotherm ◽  
Liquid Waste ◽  
Isotherm Model ◽  
Isotherm Models ◽  
Synthetic Dyes ◽  
Isotherm Equation ◽  
Adsorption Data

Abstract The process of manufacturing Sasirangan - a traditional fabric of South Kalimantan - has an impact that affects environmental pollution, namely the dyeing process of the fabric. The synthetic dyes used contain heavy metals and one of those toxic metals is copper (Cu). This study aims to determine the adsorption capacity of rice husk activated carbon adsorbent by adjusting the adsorption pattern based on isotherm models as the treatment to sasirangan liquid waste. The method consists of three stages: preparation of adsorbent by carbonization process, chemical and physical activation, then continued by adsorption process of Cu metal with carbon from rice husks with variations of adsorbent dose (2, 4, and 6 grams). This treatment was conducted by batch process. In this reseach, the adsorption capacity of rice husk adsorbent towards heavy metal Cu in sasirangan liquid waste was determined from the equilibrium state with the Langmuir isotherm equation and Freundlich isotherm equation. Based on isothermal studies of adsorption data, the correlation coefficient values obtained from the isotherm model approaches are: for dose of 2 grams adsorbent, Langmuir R2 = 0.9991 and Freundlich R2 = 0.9981; for dose of 4 grams adsorbent, Langmuir R2 = 0.9992 and Freundlich R2 = 0.9989; for dose of 6 grams adsorbent, Langmuir R2 = 0.9990 and Freundlich R2 = 0.9986. The results of investigation indicate that adsorption data correlated well with Langmuir isotherm model.

scholarly journals Iron Oxide (Fe3O4)-Supported SiO2 Magnetic Nanocomposites for Efficient Adsorption of Fluoride from Drinking Water: Synthesis, Characterization, and Adsorption Isotherm Analysis

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1514
Author(s):  
Amna Sarwar ◽  
Jin Wang ◽  
Muhammad Saqib Khan ◽  
Umar Farooq ◽  
Nadia Riaz ◽  
...  
Keyword(s):  
Drinking Water ◽  
Iron Oxide ◽  
Research Work ◽  
Freundlich Isotherm ◽  
Chemical Precipitation ◽  
Magnetic Nanomaterials ◽  
Isotherm Models ◽  
Wet Impregnation ◽  
Adsorption Capacities ◽  
Adsorption Data

This research work reports the magnetic adsorption of fluoride from drinking water through silica-coated Fe3O4 nanoparticles. Chemical precipitation and wet impregnation methods were employed to synthesize the magnetic nanomaterials. Moreover, the synthesized nanomaterials were characterized for physicochemical properties through scanning electron microscopy, Fourier-transform infrared spectroscopy, and X-ray powder diffraction. Screening studies were conducted to select the best iron oxide loading (0.0–1.5 wt%) and calcination temperature (300–500 °C). The best selected nanomaterial (0.5Fe-Si-500) showed a homogenous FeO distribution with a 23.79 nm crystallite size. Moreover, the optimized reaction parameters were: 10 min of contact time, 0.03 g L−1 adsorbent dose, and 10 mg L−1 fluoride (F−) concentration. Adsorption data were fitted to the Langmuir and Freundlich isotherm models. The Qm and KF (the maximum adsorption capacities) values were 5.5991 mg g−1 and 1.869 L g−1 respectively. Furthermore, accelerated adsorption with shorter contact times and high adsorption capacity at working pH was among the outcomes of this research work.

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