scholarly journals Langmuir Adsorption Kinetics in Liquid Media: Interface Reaction Model

ACS Omega ◽  
2021 ◽  
Author(s):  
Md Akhtarul Islam ◽  
Myisha Ahmed Chowdhury ◽  
Md. Salatul Islam Mozumder ◽  
Md. Tamez Uddin
Keyword(s):  
Adsorption Kinetics ◽  
Interface Reaction ◽  
Reaction Model ◽  
Liquid Media ◽  
Langmuir Adsorption

A TEMPERATURE-PROGRAMED DESORPTION STUDY OF THE ADSORPTION AND REACTIONS OF D2O ON SINGLE CRYSTAL SILICON SURFACES

1994 ◽  
Vol 01 (04) ◽  
pp. 505-507
Author(s):  
M.C. FLOWERS ◽  
N.B.H. JONATHAN ◽  
A. MORRIS ◽  
S. WRIGHT
Keyword(s):  
Single Crystal ◽  
Adsorption Kinetics ◽  
Single Crystal Silicon ◽  
Silicon Surfaces ◽  
Crystal Surfaces ◽  
Crystal Silicon ◽  
Single Crystal Surfaces ◽  
Langmuir Adsorption ◽  
First Order ◽  
Desorption Study

The adsorption of D 2O and subsequent desorption of D 2 and SiO from Si(100)-2×1 and Si(111)-7×7 single crystal surfaces have been investigated using the technique of temperatureprogramed desorption. It has been found that adsorption on Si(100)-2×1 is rapid and can be interpreted in terms of first-order Langmuir adsorption kinetics. In contrast, adsorption on the Si(111)-7×7 surface proceeds at a very much slower rate following an initial rapid uptake. It is found that the D 2 TPD peak arising from D 2 O exposure is very similar in shape, width, and desorption temperature to that from atomic deuterium exposure except that a small fraction of the adsorbed deuterium is retained to higher temperatures.

scholarly journals Adsorption of nitrate onto biochar derived from agricultural residuals

2017 ◽  
Vol 77 (2) ◽  
pp. 548-554 ◽  
Author(s):  
Haihua Zhao ◽  
Yingwen Xue ◽  
Li Long ◽  
Xiaolan Hu
Keyword(s):  
Thermal Stability ◽  
Aqueous Solutions ◽  
Porous Structure ◽  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Low Cost ◽  
Batch Adsorption ◽  
Surface Functional Groups ◽  
Good Thermal Stability ◽  
Langmuir Adsorption

Abstract To develop low-cost adsorbents for aqueous nitrate, biochars were prepared from three types of agricultural residuals at different pyrolysis temperatures (300 °C, 450 °C, and 600 °C). The corncob biochar produced at 600 °C (CC600) was the best nitrate adsorbent of all the tested biochars. Characterization results showed that CC600 had good thermal stability, porous structure, and abundant surface functional groups. Findings from batch adsorption experiments demonstrated that CC600 showed relatively fast adsorption kinetics to nitrate in aqueous solutions. In addition, the Langmuir adsorption capacity of CC600 to nitrate was 14.46 mg/g, comparable to that of other biochar-based adsorbents. Therefore, CC600 showed promising potential to be used as a low-cost adsorbent for the treatment of nitrate in water.

Interface reaction model for process voiding in aluminum conductor lines

1991 ◽  
Vol 59 (6) ◽  
pp. 680-681 ◽  
Author(s):  
W. T. Tseng ◽  
J. P. Stark
Keyword(s):  
Interface Reaction ◽  
Reaction Model

Monte Carlo Study of Etching at Silica-Water Interface

1998 ◽  
Vol 543 ◽  
Author(s):  
Andrew Yen ◽  
Xiaolin Zhao ◽  
Raoul Kopelman
Keyword(s):  
Monte Carlo ◽  
Power Law ◽  
Adsorption Mechanism ◽  
Silica Surface ◽  
Surface Adsorption ◽  
Monte Carlo Study ◽  
Reaction Model ◽  
Diffusion Reaction ◽  
Shell Effect ◽  
Langmuir Adsorption

AbstractA surface adsorption-diffusion-reaction model is proposed and tested by Monte Carlo simulations. The solvent shell effect is considered as a geometric constraint and the Langmuir adsorption mechanism is also incorporated. An anomalous power law of t1/2 is obtained for the amount of material removed from the surface vs. time. The result agrees well with etching experiments of SAM on a silica surface. We conclude that the unusual power law results from an interplay of vacancy growth and fusion at the surface.

scholarly journals Adsorption of Lead(II) Ions using Coconut Fiber’s (Cocos nusifera L.) Activated by Sodium Hydroxide

2020 ◽  
Vol 9 (2) ◽  
pp. 107-110
Author(s):  
Gatut A. Wardani ◽  
Dea D. Pamungkas ◽  
Winda T. Wulandari ◽  
Fajar Setiawan ◽  
Estin Nofiyanti
Keyword(s):  
Adsorption Isotherm ◽  
Sodium Hydroxide ◽  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Adsorption Model ◽  
Coconut Fiber ◽  
Optimum Time ◽  
K Value ◽  
Langmuir Adsorption ◽  
Langmuir Adsorption Model

The use of green coconut fiber waste to adsorb lead(II) ions has been successfully carried out. Coconut fiber was activated first using sodium hydroxide before being used as an adsorbent. The optimum time needed for green coconut fiber to adsorb lead(II) ions was 30 minutes with the percentage of ions adsorbed by 94.34%. The lead(II) adsorption kinetics on green coconut fiber model with R2 value of 0.999 and k value of 38.95 x 10-4 minutes-1. Adsorption isotherm from lead(II) on coconut fiber followed the Langmuir adsorption model with R2 value of 0.984 and adsorption capacity of 0.070 g.mg-1.

Activated bauxite waste as an adsorbent for removal of Acid Blue 92 from aqueous solutions

2010 ◽  
Vol 62 (11) ◽  
pp. 2491-2500 ◽  
Author(s):  
Sh. Norouzi ◽  
Kh. Badii ◽  
F. Doulati Ardejani
Keyword(s):  
Adsorption Kinetics ◽  
Red Mud ◽  
Adsorption Process ◽  
Reaction Model ◽  
Aluminum Production ◽  
Activation Process ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Acid Blue ◽  
Better Than

Bauxite waste, known as red mud, is produced in some industrial processes, such as aluminum production process. In this process, the waste material is produced from leached bauxite as a by product. In this research, the removal of Acid Blue 92 (AB92) dye was investigated from aqueous solution onto the activated bauxite waste (red mud) in a batch equilibration system. Besides, the influences of pH, adsorbent dosage, contact time, initial concentration of dye and temperature have been considered. It was found that the OH group is an effective functional group for the adsorption process. The intensity of the peaks correspond to OH group has been significantly climbed after the activation process. The adsorption kinetics of AB92 can be well described by the pseudo-second-order reaction model. Based on the isotherm data obtained from the fittings of the adsorption kinetics, the Langmuir model appears to fit the adsorption process better than the Freundlich and Brunauer-Emmett-Teller (BET) models.

Stochastic modeling of multicomponent adsorption kinetics with non-linear isotherm

1996 ◽  
Vol 33 (8) ◽  
pp. 135-143 ◽  
Author(s):  
Seung-Mok Lee ◽  
A. P. Mathews ◽  
R. Nassar
Keyword(s):  
Differential Equations ◽  
Adsorption Kinetics ◽  
Model Parameters ◽  
Multicomponent Adsorption ◽  
Langmuir Adsorption ◽  
Linear Isotherm ◽  
Dilute Aqueous Solutions ◽  
Model Equations ◽  
Fixed Beds ◽  
Model Approach

A Markov process coupled with the Langmuir adsorption isotherm is developed to simulate bisolute adsorption kinetics. Estimates of all model parameters were obtained from a single-solute experiment for the adsorption of 1,1,1-trichloroethane (TCEA) and trichloroethylene (TCE) from dilute aqueous solutions onto granular activated carbon (GAC). The model verifications indicate that the representation of the rate mechanisms are adequate. The solution of the resultant model equations, which are ordinary differential equations, is simpler than the solution of the partial differential equations involved in the deterministic formulations. This model approach can be extended for the modeling of multicomponent adsorption in fixed-beds.

The Adsorptive Performance and Kinetics of Hemp Stem

2011 ◽  
Vol 332-334 ◽  
pp. 1676-1681
Author(s):  
Hua Zhang ◽  
Tian Ma ◽  
Jie Zhang
Keyword(s):  
Porous Structure ◽  
Adsorption Kinetics ◽  
Rate Equation ◽  
Gas Adsorption ◽  
Adsorption Properties ◽  
Adsorption Rate ◽  
Langmuir Adsorption ◽  
Unique Structure ◽  
Preliminary Study ◽  
Kinetics Of

In view of the unique porous structure of hemp stem, the comparison experiments were implemented on adsorption properties of hemp stem powder and Abies holophylla Maxim powder to formaldehyde, benzene and TVOC. In addition, on the basis of preliminary study on solid-gas adsorption kinetics of hemp stem, applicability of several adsorption theories was analyzed versus solid-gas adsorption. The results showed that the unique structure endowed hemp stem better adsorption properties than Abies holophylla Maxim’s. However, for different adsorbents, the adsorption kinetics characters differed obviously. Bangham and Langmuir adsorption rate equation fitted the gas-solid adsorption kinetics of hemp stem to some extent, and Langmuir’s could present its absorption to TVOC much better.

Kinetic analysis of low concentration CO detection by Au-loaded cerium oxide sensors

RSC Advances ◽  
2016 ◽  
Vol 6 (95) ◽  
pp. 92989-92995 ◽  
Author(s):  
Deblina Majumder ◽  
Aparna Datta ◽  
Manoj Kumar Mitra ◽  
Somenath Roy
Keyword(s):  
Carbon Monoxide ◽  
Kinetic Analysis ◽  
Gold Nanoparticle ◽  
Cerium Oxide ◽  
Adsorption Kinetics ◽  
Fast Response ◽  
Low Concentration ◽  
Langmuir Adsorption ◽  
Response And Recovery ◽  
Co Detection

Gold nanoparticle-loaded cerium oxide sensors detect 10–30 ppm of carbon monoxide in air with very fast response. The response and recovery transients of conductance have been modelled using two-site Langmuir adsorption kinetics.

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