Theoretical description of the kinetics of adsorption on spherical sorbent granules with Freundlich isotherm

1981 ◽  
Vol 30 (8) ◽  
pp. 1378-1383
Author(s):  
V. V. Ugrozov ◽  
P. P. Zolotarev
Keyword(s):  
Freundlich Isotherm ◽  
Theoretical Description ◽  
Kinetics Of Adsorption ◽  
Kinetics Of

scholarly journals Preparation of a Novel Activated Carbon from Cassava Sludge for the High-Efficiency Adsorption of Hexavalent Chromium in Potable Water: Adsorption Performance and Mechanism Insight

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3602
Author(s):  
Ling Li ◽  
Yan Li ◽  
Yiqi Liu ◽  
Lei Ding ◽  
Xiaopeng Jin ◽  
...  
Keyword(s):  
Activated Carbon ◽  
High Efficiency ◽  
Freundlich Isotherm ◽  
Pore Filling ◽  
Solution Ph ◽  
Kinetics Of Adsorption ◽  
Metal Elements ◽  
Intra Particle Diffusion ◽  
Equilibrium Process ◽  
Kinetics Of

Particularly, because of the leakage risk of metal elements from sludge carbon, little attention has been focused on using sludge activated carbon as an adsorbent for the removal of Cr (VI) from contaminated water sources. Herein, a novel sludge carbon derived from dewatered cassava sludge was synthesized by pyrolysis using ZnCl2 as an activator at the optimal conditions. The prepared sludge activated carbon possessed a large BET surface (509.03 m2/g), demonstrating an efficient removal for Cr (VI). Although the time to reach equilibrium was extended by increasing the initial Cr (VI) concentration, the adsorption process was completed within 3 h. The kinetics of adsorption agreed with the Elovich model. The whole adsorption rate was controlled by both film and intra-particle diffusion. The Cr (VI) removal efficiency increased with elevating temperature, and the adsorption equilibrium process followed the Freundlich isotherm model. The adsorption occurred spontaneously with endothermic nature. The removal mechanism of Cr (VI) on the prepared sludge activated carbon depended highly on solution pH, involving pore filling, electrostatic attraction, reduction, and ion exchange. The trace leakage of metal elements after use was confirmed. Therefore, the prepared sludge activated carbon was considered to be a highly potential adsorbent for Cr (VI) removal from contaminated raw water.

Adsorption of Bisphenol-A by HDTMA Modified Clinoptilolite

2011 ◽  
Vol 71-78 ◽  
pp. 717-721
Author(s):  
Hong Yu Wang ◽  
Hang Li Zhang ◽  
Qian Zhao ◽  
Hui Fei Huang
Keyword(s):  
Bisphenol A ◽  
Rate Constant ◽  
Absorption Rate ◽  
Ph Value ◽  
Freundlich Isotherm ◽  
Ammonium Bromide ◽  
Solution Ph ◽  
Kinetics Of Adsorption ◽  
Modified Clinoptilolite ◽  
Kinetics Of

The adsorption of bisphenol-A (BPA) by hexadecyl trimethyl ammonium bromide (HDTMA) modified clinoptilolite was presented. In this paper, the equilibrium adsorption of BPA by HDTMA modified clinoptilolite was described by Freundlich isotherm with a correlation coefficient's square (R2) of 0.988. The kinetics of adsorption was defined by second-order kinetics with a rate constant (Kv) of 1.98 g/mg/h. The absorption rate was fast, and the liquid solid equilibrium was accomplished within 180 minutes. The effects of initial solution pH, and reaction temperatures had been estimated, showing that the adsorption was enhanced gradually by increasing pH value.

scholarly journals Kinetics, Isotherms and Thermodynamic Modeling of Liquid Phase Adsorption of Crystal Violet Dye onto Shrimp-Waste in Its Raw, Pyrolyzed Material and Activated Charcoals

2019 ◽  
Vol 9 (24) ◽  
pp. 5337 ◽  
Author(s):  
John Rojas ◽  
David Suarez ◽  
Alfredo Moreno ◽  
Javier Silva-Agredo ◽  
Ricardo A. Torres-Palma
Keyword(s):  
Crystal Violet ◽  
Freundlich Isotherm ◽  
Point Of Zero Charge ◽  
Shrimp Waste ◽  
Kinetics Of Adsorption ◽  
Liquid Phase Adsorption ◽  
High Ionization ◽  
Crystal Violet Dye ◽  
Adsorption Data ◽  
Kinetics Of

Shrimp waste and its charcoal derivatives were evaluated for the removal of crystal violet. Activation was conducted at 500 °C with phosphoric acid at the 1:2 and 1:3 ratios. Activated charcoals were more porous and had a more roughly surface containing mainly C, O, Ca N, and P. Equilibrium adsorption data were fitted using seven kinetic and six isotherms models. Activation created acidic moieties (>4700 µmol/g) and reduced the point of zero charge (<2.5). Freundlich isotherm best described the uptake of the dye onto the adsorbents suggesting a heterogeneous adsorption, whereas the Bangham and Avrami models best described the kinetics of adsorption process. An endothermic and spontaneous physisorption was responsible for the sorption phenomena in most adsorbents. The high removal of crystal violet was attributed to the high ionization capacity of the adsorbent coupled with the high external surface area (>44 m2/g). The best adsorption capacity (208 mg/g) was found for the activated and charred materials, whereas the lowest one (3.9 mg/g) was found for the pyrolyzed material. This research creates the possibility to deal with two environmental problems: (i) the reuse of shrimp waste and (ii) the removal of water pollutants such as crystal violet.

scholarly journals Kinetics of Adsorption in Mercury Removal Using Cassava (Manhiot esculenta) and Lemon (Citrus limonum) Wastes Modified with Citric Acid1

2015 ◽  
Vol 19 (2) ◽  
pp. 37 ◽  
Author(s):  
Candelaria Tejada ◽  
Ángel Villabona Ortiz ◽  
Luz Ercilia Garcés Jaraba
Keyword(s):  
Negative Impact ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Industrial Effluents ◽  
Second Order ◽  
Kinetics Of Adsorption ◽  
Pseudo Second Order ◽  
Toxic Concentrations ◽  
Kinetics Of ◽  
Best Fit

The high toxic concentrations of mercury in water bodies and its negative impact on the environment has resulted in the need for research on effective and low-cost methods for the treatment of industrial effluents, such as adsorption. This research compares the feasibility and viability of the adsorption abilities of cassava and lemon citric acid-modified peels. The results showed that the modified peel of cassava has a better adsorption ability compared to that of lemon. The kinetics models that best fit the experimental data were the Pseudo-second order model and the Elovich model for both modified biomasses. This means that the mechanism that controls the adsorption is a second order reaction, and also shows that the catalytic area of the adsorbent is heterogeneous; whereas the Freundlich isotherm describes better the adsorption process. In conclusion, the use of waste material is possible for Hg (II) removal. The study of chemical modifications is suggested to improve the adsorption percentages.

Biosorption of Cadmium onto Pseudomonas fluorescens: Application of Isotherm and Kinetic Models

2010 ◽  
Vol 171-172 ◽  
pp. 49-52 ◽  
Author(s):  
Chang Li Yu ◽  
Zhi Peng Lu ◽  
Fa Zhi Ge ◽  
Er Li Zhao
Keyword(s):  
Pseudomonas Fluorescens ◽  
Functional Groups ◽  
Metal Ion ◽  
Freundlich Isotherm ◽  
Industrial Effluents ◽  
Rate Equations ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Kinetics Of Adsorption ◽  
Isotherm And Kinetic Models

The present study was undertaken to evaluate the feasibility of Pseudomonas fluorescens biomass for the removal of cadmium ions from aqueous solutions. Batch experiments were performed to study the adsorption of cadmium on pH, Pseudomonas fluorescens biomass adsorbent with respect to initial Cd(II) concentration, contact time and biomass dose. The experimental data were modeled by Langmuir and Freundlich isotherm models. Langmuir model resulted in the best fit of the adsorption data. The maximum adsorption capacity for Cd(II) was 66.25 mg/g (pH 5.0 and 5 g/L biomass dose). Kinetics of adsorption followed second-order rate equations. The FTIR results of Pseudomonas fluorescens biomass showed that biomass has different functional groups and these functional groups are able to react with metal ion in aqueous solution. The results of the present study suggest that Pseudomonas fluorescens biomass can be used beneficially in treating industrial effluents containing heavy metal ions.

The use of bioluminescence as a reporter to study the adherence of the plant growth promoting rhizopseudomonads 7NSK2 and ANP15 to canola roots

1993 ◽  
Vol 39 (3) ◽  
pp. 329-334 ◽  
Author(s):  
J. Boelens ◽  
D. Zoutman ◽  
J. Campbell ◽  
W. Verstraete ◽  
W. Paranchych
Keyword(s):  
Plant Growth ◽  
Freundlich Isotherm ◽  
Root Surface ◽  
Broad Host Range ◽  
Bacterial Bioluminescence ◽  
Range Vector ◽  
Plant Growth Promoting ◽  
Specific Receptors ◽  
Growth Promoting ◽  
Kinetics Of

The adherence of the plant growth promoting rhizopseudomonads Pseudomonas aeruginosa 7NSK2 and Pseudomonas fluorescens ANP15 to canola roots (Brassica campestris L. c.v. Tobin) was examined by means of a bacterial bioluminescence system. The bioluminescence broad host range vector pDLUX-I was constructed from pLAFR-I and the lux A–E genes of Vibrio fischerii. This vector was conjugally transferred into the plant growth promoting rhizopseudomonads 7NSK2 and ANP15. The transformed strains were constitutively bioluminescent at an optimal temperature of 21 °C. The measured bioluminescence was directly proportional to the density of the bacteria in suspension and was the same for both planktonic and sessile bacteria adhering to the root surface. The adherence of the plant growth promoting rhizopseudomonads was proportional to the density of the bacterial inoculum, approached saturation at 60 min, and was reversible. The kinetics of the microbial adhesion was described by a Freundlich isotherm suggesting that the adherence of the bacteria to the canola root surface does not involve specific receptors. We conclude that the pDLUX-I vector is an easy and accurate way to study the kinetics of microbial adherence to the rhizoplane.Key words: rhizopseudomonads, bioluminescence, adhesion, plant growth promotion.not available

Sign in / Sign up

Export Citation Format

Share Document