THE USE OF THE FREUNDLICH ISOTHERM FOR SOIL PHOSPHATE SORPTION DATA

1975 ◽  
Vol 26 (3) ◽  
pp. 241-246 ◽  
Author(s):  
A. H. FITTER ◽  
C. D. SUTTON
Keyword(s):  
Freundlich Isotherm ◽  
Sorption Data ◽  
Phosphate Sorption ◽  
Soil Phosphate

Acid Hydrolysis Lignin as a Sorbent for Naphthalene

2001 ◽  
Vol 36 (4) ◽  
pp. 719-735 ◽  
Author(s):  
Angela Keane ◽  
Subhasis Ghoshal
Keyword(s):  
Organic Matter ◽  
Acid Hydrolysis ◽  
Waste Product ◽  
Freundlich Isotherm ◽  
Packed Bed ◽  
Hydrolysis Lignin ◽  
Sorptive Capacity ◽  
Sorption Data ◽  
Large Pressure ◽  
Acid Hydrolysis Lignin

Abstract Lignin, a major polymeric constituent of woody plant tissue, is an abundant source of natural organic matter available as a waste product from the pulp and paper and the fuel ethanol industries. In this study, the sorptive capacity of acid hydrolysis lignin for naphthalene, a representative nonpolar hydrophobic organic compound (HOC), was investigated. When powdered lignin is mixed with distilled water, dissolved and/or colloidal organic matter leaches into the aqueous phase imparting a cloudy yellowish colour. A washing and filtering protocol was developed for pretreating the lignin employed in the sorption studies. Results from batch sorption experiments showed that acid hydrolysis lignin has a strong affinity for naphthalene. The Freundlich isotherm coefficients obtained indicate that the sorption isotherm for naphthalene on hydrolysis lignin is nearly linear. A modified Freundlich equation was employed in order to compare sorption data for HOCs on lignin and activated carbon through the use of unit equivalent coefficients. The results presented in this research and in the literature suggest that the two sorbents are comparable in terms of sorption coefficients. It was determined that acid hydrolysis lignin is unsuitable for use in a packed bed since pumping a naphthalene solution through a column packed with lignin caused the wet lignin to become significantly hardened over time, resulting in a large pressure drop across the system.

scholarly journals Sorption of Ni(II) and Cr(III) ions by the Chironomus yoshimatsui larvae from wastewater

2018 ◽  
Vol 15 (1) ◽  
pp. 6062-6069
Author(s):  
Keon Sang Ryoo
Keyword(s):  
Freundlich Isotherm ◽  
Sorption Kinetics ◽  
Isotherm Model ◽  
Sorption Data ◽  
First Order ◽  
Batch System ◽  
Survival Capacity ◽  
Langmuir Isotherm Model ◽  
Treatment Technologies ◽  
Kinetics Of

In this study, Chironomus yoshimatsui larvae were applied to remove Ni(II) and Cr(III) ions from wastewater. The sorption studies were carried out using laboratory-reared C. y. larvae. It was found that C. y. larvae are very susceptible to Cr(III) as compared to Ni(II). The survival capacity of C. y. larvae was sharply reduced when exposed to even low Cr(III) concentration. Sorption isotherm and kinetics of C. y. larvae for Ni(II) were determined by means of controlled experiments in a batch system. It was observed that sorpyion efficiency of Ni(II) was largely concentration dependent and more effective at lower concentration. At each equilibrium, Ni(II) was removed up to roughly 44∼80 %. Sorption data were better fitted to the Langmuir isotherm model because of its correlation coefficient R2 value greater than that of the Freundlich isotherm model. The sorption kinetics by C. y. larvae for Ni(II) was well described a pseudo-first-order rate expression. C. y. larvae have enormous potential for application in wastewater treatment technologies because they are widespread and abundant all around the world and can be easily kept in culture.

scholarly journals The use of sea shell (Donax trunculus) powder to remove Sr(II) ions from aqueous solutions

2018 ◽  
Vol 78 (4) ◽  
pp. 827-836 ◽  
Author(s):  
Aysun Bulut ◽  
Sabriye Yusan ◽  
Sule Aytas ◽  
Senol Sert
Keyword(s):  
Aqueous Solutions ◽  
Freundlich Isotherm ◽  
Cost Effective ◽  
Mass Ratio ◽  
Sorption Equilibrium ◽  
Sorption Data ◽  
Donax Trunculus ◽  
Strontium Ion ◽  
Shell Powder ◽  
Maximum Removal

Abstract This study aimed to investigate and explore the possibility of using ground sea shell powder (Donax trunculus) (SSP) for sorption of Sr(II) ions from aqueous solutions. The maximum removal of Sr(II) removal in SSP was 60% at initial Sr(II) concentration of 25 mg/L, at pH 6.0, contact time 120 min, temperature 25 °C and volume/mass ratio equivalent to 500. Sorption data were interpreted considering the adsorption isotherms and thermodynamic parameters calculated. The maximum Sr(II) adsorption on SSP was 25.45 mg/g at pH 6.0. Freundlich isotherm and Dubinin–Radushkevich models were seen to be more compatible with the sorption equilibrium. The nature of the process was spontaneous and exothermic. The results suggest that SSP could be used as an efficient and cost-effective adsorbent to remove strontium ion.

Adsorption of Fluorine from Aqueous Solution by Chitosan Magnetic Microspheres of Loading Lanthanum

2013 ◽  
Vol 634-638 ◽  
pp. 367-374 ◽  
Author(s):  
Jin Song Wang ◽  
Feng Rong Fang ◽  
Heng Yue ◽  
Qing Wei Guo ◽  
Zhen Cheng Xu
Keyword(s):  
Reaction Time ◽  
Removal Rate ◽  
Fluoride Concentration ◽  
Correlation Coefficients ◽  
Freundlich Isotherm ◽  
Magnetic Microspheres ◽  
Optimum Operating ◽  
Operating Parameters ◽  
Sorption Data ◽  
Effects Of Ph

The adsorption of fluoride by chitosan magnetic microspheres of loading lanthanum metal (CTS-La) was investigated in this study. The chitosan magnetic materials were prepared by organically-linking technique. The effects of pH, the reaction time, the initial concentration, dosage and temperature on the removal rate were studied to determine to the optimum operating parameters. The experimental results show that CTS-La is a black particle shape material with magnetism. The magnetic microspheres have high adsorption ability for fluoride, and the maximum removal of F- was 98.4% under the operating parameters of the initial fluoride concentration 10mg/L, pH=2-3,the reaction time 60minutes, dosage 0.1g, temperature 318K. . The equilibrium sorption data are fitted reasonably well in Langmuir and Freundlich isotherm model, and the correlation coefficients (R2) were Langmuir’s correlation and 0.9997 respectively.

scholarly journals Generation-3 Polyamidoamine Dendrimer-Silica Composite: Preparation and Cd(II) Removal Capacity

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Augustus N. Ebelegi ◽  
Nimibofa Ayawei ◽  
Azibaola K. Inengite ◽  
Donbebe Wankasi
Keyword(s):  
Freundlich Isotherm ◽  
Sorption Process ◽  
Pamam Dendrimer ◽  
Order Model ◽  
Diffusion Kinetic ◽  
Sorption Data ◽  
Removal Capacity ◽  
Pseudo Second Order ◽  
Film Layer ◽  
Solution Kinetic

Generation-3 polyamidoamine (PAMAM) dendrimer was implanted on silica to produce a very good adsorbent (G-3 PAMAM-SGA). The composite was characterized and used for the removal of Cd(II) ions from aqueous solution. Kinetic data fit the Lagergren pseudo-second-order model and also follow the intraparticle diffusion kinetic model to an extent, which is an indication that the sorption process is controlled by both mechanisms: intraparticle/film layer and adsorption inside the pores/crevices of the composite. Equilibrium sorption data of Cd(II) on G-3 PAMAM-SGA fit the Freundlich isotherm (R2 = 0.9993) which is indicative of multilayered adsorption that occurred on heterogeneous surfaces. The ΔG° values for all temperatures studied were negative, which indicated a spontaneous and feasible process. The result implies that G-3 PAMAM-SGA is a promising adsorbent for microscale scavenging of Cd(II) ions in aqueous solutions.

scholarly journals Removal of antibiotic Ciprofloxacin Hydrochloride from water by Kandira stone: Kinetic models and thermodynamic

2015 ◽  
Vol 17 (3) ◽  
pp. 498-507 ◽  
Keyword(s):  
Freundlich Isotherm ◽  
Entropy Change ◽  
Building Stone ◽  
Order Kinetic ◽  
Sorption Data ◽  
Ciprofloxacin Hydrochloride ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Rate Controlling Step ◽  
Cladding Material

<div> <p>In this study, Kandira stone, extensively used as a cladding material for building stone has been examined for the removal of an antibiotic Ciprofloxacin hydrochloride (CIP) from its aqueous solution. Batch experiments were performed to investigate the adsorption kinetics, equilibrium and thermodynamics between the adsorbent surfaces and CIP. The sorption data follows Freundlich isotherm. A chemical adsorption was dominant. The adsorption behaviour of CIP onto Kandira stone followed the pseudo-second-order kinetic model, indicating that the adsorption process can be expressed with the chemisorption mechanism. The intraparticle diffusion process is a rate-controlling step. The adsorption thermodynamic parameters of the free energy change (∆G<sup>o</sup>), the isosteric enthalpy change (∆H<sup>o</sup>) and the entropy change (∆S<sup>o</sup>) were calculated. The negative ∆H<sup>o</sup> values indicated that sorption of CIP was the exothermic process. The positive value of ∆G<sup>o</sup> indicates non-spontaneous nature of CIP adsorption.&nbsp;</p> </div> <p>&nbsp;</p>

scholarly journals Sorption of cationic dyes from aqueous solutions by moss Rhytidiadelphus squarrosus: Kinetics and equilibrium studies

2021 ◽  
Vol 9 (1) ◽  
pp. 53-62
Author(s):  
Lucia Remenárová ◽  
Martin Pipíška ◽  
Miroslav Horník ◽  
Jozef Augustín
Keyword(s):  
Aqueous Solutions ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Cationic Dyes ◽  
Order Kinetic ◽  
Natural Sorbent ◽  
Equilibrium Studies ◽  
Sorption Data ◽  
Maximum Sorption ◽  
Rhytidiadelphus Squarrosus

With the aim to investigate sorption properties of natural sorbent prepared from moss Rhytidiadelphus squarrosus we elucidated biosorption of cationic dyes Malachite green (BG4), Auramine O (BY2) and Thioflavine T (BY1) from aqueous solutions. The removal of dyes by moss biosorbent was found to be rapid at an initial stage and the equilibrium was reached within 1-2 hours. The pseudo-n-order kinetic model was successfully applied to the kinetic data and the order of adsorption reaction was calculated in the range from 1.7 to 2.6. The value of rate constant kn' ranged from 0.001 to 0.039 [min-1]/[μmol/g]1-n. The equilibrium data were fitted to the adsorption isotherms. The Freundlich isotherm was found to represent the measured sorption data of BG4, BY1 and BY2 well. The maximum sorption capacities of moss biomass from single dye solutions calculated by Langmuir equation were 354 μmol/g for BG4, 310 μmol/g for BY1 and 382 μmol/g for BY2. These results showed that the prepared biomass presents low-cost, natural and easy available sorbent which may be potentially used for removal of dyes from environment and also may be an alternative to more costly materials such as activated carbon.

scholarly journals Kinetic Sorption Studies of Heavy Metal Contamination on Indian Expansive Soil

2009 ◽  
Vol 6 (4) ◽  
pp. 1125-1132 ◽  
Author(s):  
M. K. Gupta ◽  
A. K. Singh ◽  
R. K. Srivastava
Keyword(s):  
Heavy Metal Contamination ◽  
Expansive Soil ◽  
Correlation Coefficients ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Sorption Data ◽  
Freundlich Model ◽  
Metallic Cadmium ◽  
Pseudo Second Order ◽  
Alluvial Clay

Sorption of metallic cadmium from the pH adjusted aqueous solutions at varying initial concentrations onto an alluvial (clay) soil through batch sorption experiments was studied. The pH of the initial concentrations ranging between 50 mg/L to 250 mg/L was varied from 3.0 to 8.0. The sorption experiments were carried out for different durations and up to 16 hours. The cadmium continued to sorb till the last experimental pH=8. The experimental sorption data fitted very well with both Langmuir and Freundlich isotherm models and Freundlich model gave higher correlation coefficients. The pseudo-second order kinetics model was most agreeable with the experimental sorption data, whereas the pseudo-first order model was found to be insufficient.

scholarly journals Studies of Dye Sensitisation Kinetics and Sorption Isotherms of Direct Red 23 on Titania

2008 ◽  
Vol 2008 ◽  
pp. 1-7 ◽  
Author(s):  
Peter J. Holliman ◽  
Beatriz Vaca Velasco ◽  
Ian Butler ◽  
Maarten Wijdekop ◽  
David A. Worsley
Keyword(s):  
Sorption Isotherms ◽  
Freundlich Isotherm ◽  
Zero Point ◽  
Sorption Kinetics ◽  
X Ray Diffraction ◽  
Dye Sensitization ◽  
Sorption Data ◽  
Charge Analysis ◽  
Uptake Data ◽  
Kinetics And Isotherms

Sorption kinetics and isotherms have been measured for a commercial dye (Direct Red 23) on different samples of powdered Titania, and the data were analysed to better understand the dye sensitization process for dye sensitised solar cells (DSSCs). For the sorption kinetics, the data show rapid initial sorption (<1 hour) followed by slower rate of increasing uptake between 1 and 24 hours. While higher initial concentrations of dye correspond to higher sorption overall, less dye is absorbed from higher initial dye concentrations when considered as percentage uptake. The correlation between the sorption data and model isotherms has been considered with time. The Langmuir model shows better correlations compared to the Freundlich isotherm. The dye uptake data has also been correlated with Titania characterization data (X-ray diffraction, scanning electron microscopy, BET and zero point charge analysis). Kinetic data show significantly better fits to second-order models compared to first order. This suggests that chemisorption is taking place and that the interaction between the dye sorbate and the Titania sorbent involves electron sharing to form an ester bond.

scholarly journals Application of Langmuir and Freundlich Isotherms to Phosphate Sorption by Soils: Modelling and Effects of pH

1970 ◽  
Vol 66 (1) ◽  
Author(s):  
Oanamari ORBULEŢ ◽  
Liana KREIDER ◽  
Cristina MODROGAN ◽  
Alexandra MIRON ◽  
Giani APOSTOL ◽  
...  
Keyword(s):  
Soil Phosphorus ◽  
Freundlich Isotherm ◽  
Inorganic Phosphorus ◽  
Phosphorus Sorption ◽  
Phosphate Sorption ◽  
Freundlich Isotherms ◽  
Charged Surfaces ◽  
Effects Of Ph ◽  
Ph Range

Phosphate sorption capability is an important soil characteristic which determines the nutrients dynamics. Research studies on the chemistry of inorganic phosphorus in soil showed that in soil occur several reactions with resulting compounds; these reactions are dependent on factors like soil pH, type and quality of soil minerals, quantity of soil phosphorus and other soil properties. The work seeks to determine the equilibrium curves by using a thermodynamic study in order to determine sorption degree of phosphorus (P) on soil grains (chernozem from Teleorman area and sandy soil from Dabuleni area) using the isotherm functions Langmuir and Freundlich typically used to describe adsorption equilibrium, at a phases mass ratio soil:water of 1:5 in the pH range 59. KH2PO4 solutions were used as aqueous phases at a concentration range of 10-100. The Freundlich isotherm was more attractive than the Langmuir isotherm in describing phosphorus sorption by soil. Thus, quantifying the ratio between concentration of P adsorbed on soil and concentration of P in soil solution is an important step for describing the specific adsorption of ions on soil’s charged surfaces taking pH into account. Moreover, these simple isotherms used in describing phosphorus sorption have a significant role being useful for summarizing both the information about a given soil and the effects of a particular treatment involving the same soil.

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