Adsorption Energetics, Models, and Isotherm Equations

2005 ◽  
pp. 67-143 ◽  
Keyword(s):  
Isotherm Equations

scholarly journals Removal of Cadmium(II) from Water using Modified Citrus limettioides Peels: Thermodynamic and Isotherm Studies

2019 ◽  
Vol 32 (1) ◽  
pp. 73-78
Author(s):  
P. Janaki ◽  
R. Sudha ◽  
T.S. Sribharathi ◽  
P. Anitha ◽  
K. Poornima ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Low Cost ◽  
Raw Material ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Adsorption Method ◽  
Chemically Modified ◽  
Adsorption Performance ◽  
Monolayer Adsorption ◽  
Isotherm Equations

The adsorption performance of sulphuric acid treated low cost adsorbent synthesized by using Citrus limettioides peel as an effective raw material for the removal of cadmium(II) from water. The batch adsorption method was carried out to optimize some parameters like contact time, pH and adsorbent dose. The nonlinear isotherm equations were used to calculate the different isotherm constant of five isotherm models namely Freundlich, Langmuir, Dubinin-Radushkevich, Redlich-Peterson and Sips. The Langmuir monolayer adsorption capacity of chemically modified Citrus limettioides peel was found to be 287.60 mg g-1. The negative values of ΔGº and ΔHº showed that the adsorption process is spontaneous and exothermic.

scholarly journals Chromium removal from industrial wastewater using Phyllostachys pubescens biomass loaded Cu-S nanospheres

2018 ◽  
Vol 16 (1) ◽  
pp. 842-852 ◽  
Author(s):  
Tian Ai ◽  
Xiaojun Jiang ◽  
Qingyu Liu
Keyword(s):  
Ion Exchange ◽  
Internal Surface ◽  
Freundlich Isotherm ◽  
Phyllostachys Pubescens ◽  
Mechanism Analysis ◽  
Adsorption Mode ◽  
Modification Method ◽  
Equilibrium Data ◽  
Isotherm Equations ◽  
Complex Copper

AbstractIn this paper, a new surface modification method was reported for the preparation of Phyllostachys pubescens powder as an effective adsorbent for the removal of chromium. Complex copper sulfide (Cu-S)nanospheres were evenly dispersed and loaded into the internal surface of the adsorbent, which provided both the ion exchange and oxidative-reductive properties. The composite showed an excellent adsorption efficacy for Cr(III) and Cr(VI). The surface properties of the obtained materials were characterized by FTIR and SEM. Maximum adsorption for Cr(III) and Cr(VI) was observed at pH 6.1 and 1.9, respectively. The experimental sorption equilibrium data were modeled using Langmuir and Freundlich isotherm equations. It was found that the maximum adsorption capacities of Cr(III) and Cr(VI) were 52.30 mg g-1 and 94.25 mg g-1, respectively. The adsorption mechanism analysis inferred that the major adsorption mode of Cr(III) was ion exchange, and Cr(VI) was oxide-reduction.

scholarly journals STUDI KINETIKA ADSORPSI Pb MENGGUNAKAN ARANG AKTIF DARI KULIT PISANG

Konversi ◽  
2015 ◽  
Vol 4 (1) ◽  
pp. 17
Author(s):  
Ari Susandy Sanjaya ◽  
Rizcy Paramita Agustine
Keyword(s):  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Langmuir Equation ◽  
Kinetics Model ◽  
Banana Peel ◽  
Maximum Adsorption Capacity ◽  
Kinetics Analysis ◽  
Optimum Time ◽  
Lead Metal ◽  
Isotherm Equations

Abstrak- Logam Pb merupakan salah satu pencemar lingkungan dan dapat mengakibatkan kematian atau gangguan kesehatan dalam waktu singkat. Salah satu cara untuk mengatasi masalah pencemaran Pb adalah dengan menggunakan arang aktif dari kulit pisang. Penelitian ini bertujuan untuk menentukan model kinetika yang sesuai pada proses adsorpsi Pb dengan melihat daya jerap arang aktif kulit pisang dalam berbagai variasi massa (1 g; 1,5g dan 2 g) dan waktu kontak (20 menit, 40 menit dan 60 menit). Analisa Kinetika didasarkan pada kinetika orde nol, orde satu dan orde dua serta menentukan kapasitas maksimum adsorpsi arang atif kulit pisang  terhadap logam Pb. Persamaan yang digunakan dalam proses adsorpsi adalah persamaan adsorpsi Isoterm Langmuir dan Freundlich. Dari hasil analisa, waktu optimum adsorbsi terjadi pada waktu 60 menit.  Kinetika adsorbsi logam Pb dengan arang aktif dari kulit pisang pada massa 1 dan 2 g mengikuti model kinetika orde 2, sedangkan pada massa 1,5 g mengikuti kinetika orde 0. Persamaan adsorpsi Langmuir lebih sesuai untuk isotherm adsorpsi pada penelitian ini. Adsorpsi Pb oleh kulit pisang yang sesuai dengan pola isotherm adsorpsi Langmuir mengindikasikan bahwa adsorpsi hanya berlangsung satu lapis (monolayer). Kapasitas adsorpsi maksimum ditunjukkan oleh nilai a yang besar, yaitu 1,4582 pada massa 1 g sedangkan kekuatan interaksi antara ion Pb2+ dengan kulit pisang terjadi pada massa 2 g yang ditunjukkan dengan nilai kL yang besarnya 0,409 Kata kunci : kinetika adsorpsi, arang aktif, kulit pisang, logam Pb  Abstract- Lead metal is one of environment polluter and can cause decease or health problems in sort time. The way to solve this problem is with used the carbon active from banana peel. This research is intend to find the kinetics model that appropriate in Pb adsorption process by knowing absorption of banana peel carbon active within mass variations (1; 1,5 and 2 g) and contact time (20, 40, and 60 minutes). Kinetics analysis are based from orde zero,one, and two and find the maximum capacity of adsorption from banana peel carbon active to lead metal. Equation which using at the adsorption process are Langmuir and Freundlich isotherm equations. From the analysis results, optimum time is at 60 minutes.kinetics of Pb absorption with carbon active from banana peel in mass 1 and 2 gr following kinetics model orde 2, then in mass 1,5 g following kinetics model orde 0. Langmuir equation is more appropriate in this research. Pb absorption from the banana peel that appropriate to Langmuir isotherm system is indicates adsorption was occur in one layer (monolayer). Maximum adsorption capacity is showing by the bigger value from a, that is 1,4582 in mass 1 g then interaction power of Pb with the banana peel was occur in mass 2 gr which showing with the value of kL is 0,4090.  Keywords : adsorption kinetics, carbon active, banana peel, Pb metal

scholarly journals Adsorption of Hydrogen Sulphide on the Zeolite type A Synthezied from Iraqi Kaoline

2013 ◽  
Vol 10 (3) ◽  
pp. 1023-1033 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Adsorption Process ◽  
Adsorption Properties ◽  
Zeolite A ◽  
Exchange Method ◽  
Adsorption Data ◽  
H2s Adsorption ◽  
Zeolite Type ◽  
Ion Exchange Method ◽  
Isotherm Equations ◽  
Static Form

Three types of zeolite A were prepared from Iraqi kaoline which are 3A, 4A and 5A by ion exchange method .They were characterized by XRD and atomic absorption techniques .They were used as adsorbents to examine their applicability for H2S adsorption .The adsorption process was performed in a static form and constant volume system which constructed from stainless steel .The effect of zeolite type and temperature on the adsorption properties of H2S at -5 , 25 and 55 oC was studied .The zeolite type 5A has the highest adsorption value (79.384 µmol/g ) and the three types may be arranged in a sequence toward H2S adsorption as 5 A> 4A>3A .The amount of H2S adsorbed increased as temperature decreased from 55 to -5 for all samples. Langmuir , Frendlich and Toth isotherm equations model were applied for the adsorption data in order to determine the affinity and the heterogeneity of the three adsorbents. The heterogeneity parameters of the model equation applied indicated that 5A sample was more heterogeneous compared to other zeolite types.

Application of dimensional analysis in removal prediction of 2-[4-(dimethylamino) styryl]-1-methylpyridinium iodide dye using humic acid coated magnetic nanoparticle

2021 ◽  
Author(s):  
Anahita Esmaeilian ◽  
Kevin E. O'Shea
Keyword(s):  
Humic Acid ◽  
Dimensional Analysis ◽  
Concentration Ratio ◽  
Magnetic Nanoparticle ◽  
Equilibrium Concentration ◽  
Sorption Process ◽  
Dose Ratio ◽  
Initial Concentration ◽  
Liquid Systems ◽  
Isotherm Equations

<p>Numerous factors affect adsorption phenomena in solid–liquid systems. Critical factors are the sorbent dose and initial concentrations of the contaminants in the system. However, the combination of these two factors and their effects on removal prediction are largely unexplored. In this study, batch experiments were conducted to examine such effects on the adsorption of 2-[4-(dimethylamino) styryl]-1-methylpyridinium iodide cationic dye (2-ASP) in contaminated water to humic acid coated magnetic nanoparticles (HA-MNPs). Dimensional analysis and Buckingham’s π theorem were subsequently used to assess the relationship between the sorbent dose, initial concentration, and percent removal. Results of dimensional analysis along with experimental data suggest that sorbent dose and sorbate concentration ratio are the main variables controlling sorption of dye on HA-MNPs. In conventional isothermal studies, the isotherm equations are developed based on experiments of one sorbent dose which cannot be generalized for all sorbent doses.  In this study, a power function (Isotherm-like) model was obtained from the dimensional analysis that can describe precisely the sorption process of dye on HA-MNPs as a function of equilibrium concentration and sorbent dose ratio. Moreover, a relation is deduced for prediction of removal percent as a function of sorbent dose and initial concentration ratio with R<sup>2</sup> of 0.98.</p><p><strong>Keywords: Remediation, Dimensional analysis, Isotherm-like model, Magnetic nanoparticle, Styryl pyridinium dyes, Water treatment</strong></p>

Removal of VOCs Using Sludge-Based Adsorbents

2012 ◽  
Vol 599 ◽  
pp. 305-308 ◽  
Author(s):  
Ping Fang ◽  
Chao Ping Cen ◽  
Hong Tao Zhang ◽  
Zi Jun Tang ◽  
Ding Sheng Chen ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Physical Adsorption ◽  
Low Cost ◽  
Fixed Bed ◽  
Cost Effective ◽  
Langmuir Adsorption Isotherm ◽  
Fixed Bed Reactor ◽  
Dynamic Adsorption ◽  
Langmuir Adsorption ◽  
Isotherm Equations

Efficient and cost-effective sludge-based adsorbents were developed and the adsorption of VOCs on the sludge-based adsorbents was studied in a fixed bed reactor. The results indicate that the adsorption of VOCs on sludge-based adsorbents is typical physical adsorption, the dynamic adsorption capacity of VOCs on adsorbents sharply increases as the VOCs concentration is increased at first, then increasing gradually, at last retains stable with the change of VOCs concentration. The dynamic adsorption capacity of sludge-based adsorbents for VOCs is O-Xylene > Butylcetate > Toluene > Ethylacetate > Benzene > Propanone > n-Hexane, the maximum dynamic adsorption capacity is 0.247, 0.225, 0.192, 0.186, 0.180, 0.176, 0.133g/g, respectively. Meanwhile the adsorption of VOCs on sludge-based adsorbents corresponds to the Langmuir adsorption isotherm equations. The sludge-based adsorbent is a low-cost alternative to activated carbon for VOCs treatment, and this technology is a promising method for the VOCs removal.

Study on the Kinetics of Adsorption of Cadmium by Chitosan

2010 ◽  
Vol 160-162 ◽  
pp. 1804-1809
Author(s):  
Qiang Bi ◽  
Juan Qin Xue ◽  
Ying Juan Guo ◽  
Yu Jie Wang ◽  
Yun Feng Xue
Keyword(s):  
Kinetic Equations ◽  
Adsorption Kinetic ◽  
Maximum Adsorption Capacity ◽  
Kinetics Of Adsorption ◽  
Ph Values ◽  
Optimum Ph ◽  
Pseudo Second Order ◽  
Simulated Wastewater ◽  
Isotherm Equations ◽  
Kinetics Of

The adsorption of cadmium in simulated wastewater by chitosan was investigated. The influence of temperature, contact time and pH on adsorption efficiency of cadmium was examined. Some related mathematical models were used in the fitting of experimental data. The results showed that at room temperature, the optimum pH of adsorption is between 4 and 7. At lower pH values, a strong competition existed between cadmium ions and protons for sorption sites and the sorption efficiency was decreased. After 60 minutes the adsorption equilibrium can be achieved. Chitosan is very effective at removing cadmium with the maximum adsorption capacity is 112.05mg•g-1. The adsorption kinetic curves agree with the pseudo-second-order adsorption kinetic equations and the adsorption isotherms could be well described by Langmuir isotherm equations.

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