Studies on the sorption behavior of Arsenazo-I, U(VI) and Th(IV) species from aqueous solutions of Arsenazo-I on different types of ion exchangers

1996 ◽  
Vol 209 (1) ◽  
pp. 51-63
Author(s):  
F. H. El-Sweify ◽  
N. Zakaria
Keyword(s):  
Aqueous Solutions ◽  
Sorption Behavior ◽  
Ion Exchangers ◽  
Different Types

Sorption of Cadmium and Lead by Chelating Ion Exchangers Ostsorb OXIN, Ostsorb DETA, and Ostsorb DTTA

1994 ◽  
Vol 59 (6) ◽  
pp. 1311-1318 ◽  
Author(s):  
Ladislav Svoboda ◽  
Petr Vořechovský
Keyword(s):  
Ionic Strength ◽  
Aqueous Solutions ◽  
Sodium Perchlorate ◽  
Exchange Capacity ◽  
Chloride Ions ◽  
Point Of View ◽  
Alkaline Media ◽  
Ion Exchangers ◽  
Acidic Media ◽  
Cadmium And Lead

The properties of cellulose chelating ion exchangers Ostsorb have been studied in the sorption of cadmium and lead from aqueous solutions. The Cd(II) and Pb(II) ions are trapped by the Ostsorb OXIN and Ostsorb DETA ion exchangers most effectively in neutral and alkaline media but at these conditions formation of stable hydrolytic products of both metals competes with the exchange equilibria. From this point of view, Ostsorb DTTA appears to be a more suitable sorbent since it traps the Pb(II) and Cd(II) ions in acidic media already. Chloride ions interfere with the sorption of the two metals by Ostsorb DTTA whereas the ionic strength adjusted by the addition of sodium perchlorate does not affect the exchange capacity of this ion exchanger.

scholarly journals Effect of combination of pectin substances on viscosity of their aqueous solutions

2019 ◽  
Vol 81 (2) ◽  
pp. 133-138
Author(s):  
Z. N. Khatko ◽  
S. A. Titov ◽  
A. A. Ashinova ◽  
E. M. Kolodina
Keyword(s):  
Internal Friction ◽  
Aqueous Solutions ◽  
Dynamic Viscosity ◽  
Food Systems ◽  
Large Molecules ◽  
Related Substances ◽  
Shear Loads ◽  
Different Types ◽  
The Given ◽  
Pectin Substances

Viscosity is one of the characteristic properties of pectin substances, as well as other lyophilic colloids. Pectin molecules are easily associated with each other or with large molecules of related substances. This article contains the results of the study of dynamic viscosity, internal friction, thixotropic index of aqueous solutions (1 % and 4%) of various types of pectin substances and their combinations. The article presents the results of the study of the influence of different types of pectin substances and their combinations on the dynamic viscosity of pectin solutions and their internal friction. The analysis of values of dynamic viscosity and friction force depending on the type of pectin substances and their combinations is given. It is established that in cases where information on dissipative processes in pectin structures at low speeds and shear loads is required, it is necessary to rely on data on internal friction, in others - on the given information on their viscosity. The thixotropic index is calculated. It is established that the internal friction in pectin solutions and their dynamic viscosity depend on the type of pectin substances and their combinations. In pectin solutions, the internal friction is maximum for Apple pectin, and the dynamic viscosity – for a combination of citrus pectins with beet. When combining pectins, both indicators are most important for the combination of citrus with beet. The obtained data on the viscosity, internal friction and thixotropic index of solutions of different types and combinations of pectins make it possible to regulate the rheological properties of food systems with the addition of pectin substances.

Adsorption capacity of different types of carbon nanotubes towards metronidazole and dimetridazole antibiotics from aqueous solutions: effect of morphology and surface chemistry

2020 ◽  
Vol 27 (14) ◽  
pp. 17123-17137 ◽  
Author(s):  
Damarys H. Carrales-Alvarado ◽  
Roberto Leyva-Ramos ◽  
Inmaculada Rodríguez-Ramos ◽  
Esmeralda Mendoza-Mendoza ◽  
Adriana E. Moral-Rodríguez
Keyword(s):  
Carbon Nanotubes ◽  
Surface Chemistry ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Different Types

The sorption behavior of CHA-type zeolite for removing radioactive strontium from aqueous solutions

2020 ◽  
Vol 230 ◽  
pp. 115874 ◽  
Author(s):  
Jie Liang ◽  
Jiangbo Li ◽  
Xin Li ◽  
Kaili Liu ◽  
Liu Wu ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Sorption Behavior ◽  
Type Zeolite

Removal of Cd(II) and Pb(II) complexes with glycolic acid from aqueous solutions on different ion exchangers

2010 ◽  
Vol 88 (6) ◽  
pp. 540-547 ◽  
Author(s):  
Justyna Jachuła ◽  
Dorota Kołodyńska ◽  
Zbigniew Hubicki
Keyword(s):  
Aqueous Solutions ◽  
Glycolic Acid ◽  
Complexing Agent ◽  
Order Kinetic ◽  
Ion Exchangers ◽  
Phase Contact Time ◽  
Adsorption Models ◽  
Oxidation Reduction ◽  
Pseudo Second Order ◽  
Chain Polymerization

The sorption of Cd(II) and Pb(II) ions from aqueous solutions on different ion exchangers was investigated by using glycolic acid (GA) as a complexing agent. Glycolic acid is useful for organic synthesis in oxidation–reduction, esterification, and long-chain polymerization. The experiments were carried out by using the following chelating ion exchangers: Purolite S-930, Purolite S-940, Purolite S-950, Diaion CR-20, and Wofatit MC-50 and the cationic ion exchangers: Purolite C-104, Lewatit CNP-80, and Lewatit SP-112. The influence of the initial concentration of Cd(II) and Pb(II) and glycolic acid, pH of the solution, and phase contact time on the sorption percentage was determined in the batch experiments. Pseudo-first-order and pseudo-second-order kinetic models were used to describe the kinetic data, and the rate constants were evaluated. The experimental data, fitted using the Langmuir and Freundlich adsorption models, were applied to describe the equilibrium isotherms and determined the isotherm constants. The Cd(II) and Pb(II) concentrations in the raffinate were determined by the AAS method.

scholarly journals Photocatalytic Degradation of Ampicillin Using PLA/TiO2 Hybrid Nanofibers Coated on Different Types of Fiberglass

Water ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 176 ◽  
Author(s):  
Constantin Bobirică ◽  
Liliana Bobirică ◽  
Maria Râpă ◽  
Ecaterina Matei ◽  
Andra Mihaela Predescu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Photocatalytic Degradation ◽  
Kinetic Studies ◽  
Electrospinning Technique ◽  
Edge Type ◽  
Photocatalytic Reactor ◽  
Hybrid Nanofibers ◽  
Different Types ◽  
Fiberglass Fabric

New photocatalytic membranes based on polylactic acid (PLA)/TiO2 hybrid nanofibers deposited on fiberglass supports were prepared and tested for the removal of ampicillin from aqueous solutions. The electrospinning technique was used to obtain hybrid nanofibers that were deposited on three types of fiberglass with different structures, resulting in three distinct photocatalytic membranes namely fiberglass fabric plain woven-type membrane, fiberglass mat-type membrane, and fiberglass fabric one-fold edge-type membrane. The results of the photocatalytic tests showed that the highest efficiency of ampicillin removal from aqueous solution is obtained with the fiberglass fabric plain woven-type membrane. Although it has been shown that the rate of photocatalytic degradation of ampicillin is high, being practically eliminated within the first 30 min of photocatalysis, the degree of mineralization of the aqueous solution is low even after two hours of photocatalysis due to the degradation of PLA from the photocatalytic membrane. The instability of PLA in the reactive environment of the photocatalytic reactor, evidenced by morphological, mineralogical and spectroscopic analyzes as well as by kinetic studies, is closely related to the structure of the fiberglass membrane used as a support for PLA/TiO2 hybrid nanofibers.

scholarly journals Sensory profiles of sweeteners in aqueous solutions

2011 ◽  
Vol 24 (No. 6) ◽  
pp. 283-287 ◽  
Author(s):  
A. Šedivá ◽  
Z. Panovská ◽  
J. Pokorný
Keyword(s):  
Aqueous Solutions ◽  
Bitter Taste ◽  
Sucrose Solution ◽  
Tap Water ◽  
Relative Accuracy ◽  
Distilled Water ◽  
Iso Standards ◽  
Metallic Taste ◽  
Different Types ◽  
Sensory Profiles

Sensory profiles of saccharin, acesulfame K, aspartame, and neotame were compared with that of sucrose in three different types of water (tap water, commerical Crystalis water, and distilled water) under the conditions of the respective ISO standards. The intensities of off-flavours, especially bitter and metallic tastes, were higher in the solutions of synthetic sweeteners than in that of sucrose. The aspartame solution was the sample closest to the sucrose solution, and the intensity of off-flavours was significantly higher in acesulfame solution. Ratings of the bitter taste were related to those of the metallic taste, the relation being semilogarithmic. The performancies of different assessors were nearly the same in all ratings, and the absolute values of the ratings of sweetness and different off-flavours had the same repeatabilities. The relative accuracy was, naturally, much higher in off-flavours than in the case of sweetness.  

Removal of chromium (III) ions from aqueous solutions using different types of hydroxyapatites

2020 ◽  
Vol 204 ◽  
pp. 297-305
Author(s):  
Inga Zinicovscaia ◽  
Nikita Yushin ◽  
Dmitrii Grozdov ◽  
Ionel Humelnicu ◽  
Doina Humelnicu ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Different Types
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