Hydrophilicity Quantification of Highly Hydrophobic Decadodecasil 3R

1997 ◽  
Vol 62 (7) ◽  
pp. 981-994
Author(s):  
Marcel J. den Exter ◽  
Jacobus C. Jansen ◽  
Herman van Bekkum ◽  
Arlette Zikánová ◽  
Josef Dubský ◽  
...  
Keyword(s):  
Water Pressure ◽  
Sorption Isotherms ◽  
Sorption Properties ◽  
Equilibrium Sorption ◽  
Polymolecular Adsorption ◽  
Low Concentration ◽  
Bet Model ◽  
Relative Water ◽  
Hydrophilic Character ◽  
Highly Hydrophobic

Sorption properties of the clathrasil Decadodecasil 3R (DD3R) have been investigated by measuring equilibrium sorption isotherms of water. The dependence of the adsorbed amount on the relative water pressure has been found almost invariant of temperature. This behaviour has been explained by a scarce population of hydrophilic sorption sites isolated sufficiently from each other and by a polymolecular adsorption on them. Such a behaviour is consistent with a simple BET model. Both the low concentration of hydrophilic sorption sites and their weak strength confirm the generally accepted assumption on weakly hydrophilic character of DD3R.

scholarly journals Quaternization of Composite Algal/PEI Beads for Enhanced Uranium Sorption—Application to Ore Acidic Leachate

Gels ◽  
2020 ◽  
Vol 6 (2) ◽  
pp. 12 ◽  
Author(s):  
Mohammed F. Hamza ◽  
Amal E. Mubark ◽  
Yuezou Wei ◽  
Thierry Vincent ◽  
Eric Guibal
Keyword(s):  
Ph Effect ◽  
Sorption Isotherms ◽  
Environmental Safety ◽  
Sorption Properties ◽  
Yellow Cake ◽  
Maximum Sorption Capacity ◽  
Copper Precipitation ◽  
Protonated Amine ◽  
Maximum Sorption ◽  
Pre Treatment

The necessity to recover uranium from dilute solutions (for environmental/safety and resource management) is driving research towards developing new sorbents. This study focuses on the enhancement of U(VI) sorption properties of composite algal/Polyethylenimine beads through the quaternization of the support (by reaction with glycidyltrimethylammonium chloride). The sorbent is fully characterized by FTIR, XPS for confirming the contribution of protonated amine and quaternary ammonium groups on U(VI) binding (with possible contribution of hydroxyl and carboxyl groups, depending on the pH). The sorption properties are investigated in batch with reference to pH effect (optimum value: pH 4), uptake kinetics (equilibrium: 40 min) and sorption isotherms (maximum sorption capacity: 0.86 mmol U g−1). Metal desorption (with 0.5 M NaCl/0.5 M HCl) is highly efficient and the sorbent can be reused for five cycles with limited decrease in performance. The sorbent is successfully applied to the selective recovery of U(VI) from acidic leachate of uranium ore, after pre-treatment (cementation of copper, precipitation of rare earth elements with oxalate, and precipitation of iron). A pure yellow cake is obtained after precipitation of the eluate.

scholarly journals Defluoridation with Locally Produced Thai Bone Char

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Yothin Mutchimadilok ◽  
Sunisa Smittakorn ◽  
Surat Mongkolnchai-arunya ◽  
Deanna Durnford
Keyword(s):  
Sorption Isotherms ◽  
Sorption Properties ◽  
Social Constraints ◽  
Contaminated Water ◽  
Bone Char ◽  
Groundwater Samples ◽  
Sorption Ability ◽  
Synthetic Solution ◽  
Rural Thailand

The fluoride sorption ability of a locally available bone char is quantified. Both a synthetic solution and natural groundwater samples from several sites are studied and compared to Indian bone char, which is widely accepted and used successfully in India and elsewhere. The Freundlich and Langmuir sorption isotherms were used to quantify sorption properties. Results show that the Thai bone char is as effective as the Indian bone char for removing fluoride from contaminated water, despite the more rigid physical and social constraints found in rural Thailand. Sorption studies with fluoride-contaminated natural groundwater samples also show that chlorides, nitrates, and sulfates had little effect on the removal of fluoride by the homemade bone char.

scholarly journals Sorption of medical preparations by chitosan

2020 ◽  
Vol 164 ◽  
pp. 06025
Author(s):  
Anna Beliaeva ◽  
Galina Nianikova
Keyword(s):  
Quantitative Determination ◽  
Sorption Capacity ◽  
Maximum Degree ◽  
Sorption Isotherms ◽  
Sorption Process ◽  
Sorption Properties ◽  
Before And After ◽  
Static Conditions ◽  
Degree Of Sorption

The article provides information about sorption properties of crab chitosan in relation to Analgin, Aspirin, Quamatel, Mydocalm, Paracetamol, Tsifran and Phtalazol. Quantitative determination of medicines’ amount before and after sorption was performed by HPLC-MS method with the preliminary plotting of calibration curves. The sorption capacity of chitosan taken in different concentrations was determined. Sorption isotherms and kinetic curves of medications’ sorption by chitosan were plotted. It has been shown that the maximum degree of sorption in static conditions for all studied medicines was achieved within an hour after the beginning of the sorption process.

Equilibrium sorption isotherms of Moringa oleifera leaves at different temperatures

2017 ◽  
Vol 9 (1) ◽  
pp. 61-68 ◽  
Author(s):  
Sunday Samuel Sobowale ◽  
Moruf Olanrewaju Oke ◽  
Lukumon Ayinde Odunmbaku ◽  
Oluwafemi Ayodeji Adebo
Keyword(s):  
Moringa Oleifera ◽  
Sorption Isotherms ◽  
Equilibrium Sorption ◽  
Different Temperatures ◽  
Moringa Oleifera Leaves

scholarly journals Sorption of metaldehyde using granular activated carbon

2016 ◽  
Vol 7 (3) ◽  
pp. 280-287 ◽  
Author(s):  
S. Salvestrini ◽  
P. Vanore ◽  
A. Bogush ◽  
S. Mayadevi ◽  
L. C. Campos
Keyword(s):  
Activated Carbon ◽  
Kinetic Data ◽  
Sorption Isotherms ◽  
Granular Activated Carbon ◽  
Point Of Zero Charge ◽  
Particle Diffusion ◽  
Sorption Data ◽  
Freundlich Model ◽  
Equilibrium Sorption ◽  
Intra Particle Diffusion

In this work, the ability of granular activated carbon (GAC) to sorb metaldehyde was evaluated. The kinetic data could be described by an intra-particle diffusion model, which indicated that the porosity of the sorbent strongly influenced the rate of sorption. The analysis of the equilibrium sorption data revealed that ionic strength and temperature did not play any significant role in the metaldehyde uptake. The sorption isotherms were successfully predicted by the Freundlich model. The GAC used in this paper exhibited a higher affinity and sorption capacity for metaldehyde with respect to other GACs studied in previous works, probably as a result of its higher specific surface area and high point of zero charge.

scholarly journals A new method for predicting sorption isotherms at different temperatures using the BET model

2013 ◽  
Vol 114 (1) ◽  
pp. 139-145 ◽  
Author(s):  
P.B. Staudt ◽  
C.P. Kechinski ◽  
I.C. Tessaro ◽  
L.D.F. Marczak ◽  
R. de P. Soares ◽  
...  
Keyword(s):  
Sorption Isotherms ◽  
New Method ◽  
Bet Model ◽  
Different Temperatures

Thermodynamic Analysis of Water Vapour Sorption of Edible Starch Based Films

2003 ◽  
Vol 9 (2) ◽  
pp. 115-121 ◽  
Author(s):  
M. A. Bertuzzi ◽  
M. Armada ◽  
J. C. Gottifredi
Keyword(s):  
Water Sorption ◽  
Corn Starch ◽  
Gravimetric Method ◽  
Sorption Isotherms ◽  
Moisture Sorption ◽  
Sorption Process ◽  
Water Vapour Sorption ◽  
Bet Model ◽  
Moisture Sorption Isotherms ◽  
High Amylose

Moisture sorption isotherms of high amylose corn starch (HACS) films at 5, 25, 35 and 45 °C within an approximate water activity ( aw) range of 0.11-0.85 were obtained using a static gravimetric method. HACS films fitted a type III BET model at all temperatures studied. Water sorption process in high amylose based films was exothermic within the range of water activities investigated. There was a continuous decrease of the affinity between film sorbed structure with moisture as water content increased. Negative values of Δ G in the whole range of moisture content studied were indicative of a spontaneous process. The entropy curve exhibited a well-defined minimum corresponding at the completion of the monolayer.

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