scholarly journals THE STUDY OF THE SORPTION PROPERTIES OF FILTERING MATERIALS BASED ON TITANIUM PHOSPHATE - POROUS TITANIUM COMPOSITION

2021 ◽  
Vol 31 (3) ◽  
pp. 19-25
Author(s):  
Vladimir Shablovski ◽  
Alla Tuchkoskaya ◽  
Vladimir Rukhlya ◽  
Olga Pap ◽  
Kateryna Kudelko
Keyword(s):  
Porous Titanium ◽  
Titanium Phosphate ◽  
Sorption Properties ◽  
Kinetic Properties ◽  
Powder Materials ◽  
Ionic Form ◽  
Kinetic Rate ◽  
Inorganic Sorbent ◽  
Exchange Resins ◽  
Degree Of Purification

Inorganic sorbents are more selective in comparison with commercial ion exchange resins towards of metal ions. However, inorganic sorbents characterized not high kinetic properties. One of the way to increase the kinetic rate of inorganic sorbents is to reduce the particle size of these materials, other way is synthesizing inorganic sorbents as porous products from powder materials. A sample of such inorganic sorbents is titanium phosphate of various compositions. Studying the properties of microfilters based on composition titanium phosphate - porous titanium has been developed. The sorbents based on acidic titanium phosphate Ti(HPO4)2∙H2O were used for filtering solution with Fe(II) content. It is found that the number of impregnations with inorganic sorbent modificator is important and influence filtration process. The obtained results demonstrated that after the first impregnation of porous material with a smaller pore size, it is possible to obtain such sorbent as a mass content of powder material. By varying the ionic form of titanium phosphate, the porosity of titanium, the amount of impregnation, it could be possible effect on the sorption Fe(II). The sorption properties of titanium-titanium phosphate microfilters were studied by potentiometric titration in the NaCl-NaOH system, as well as the sorption of Fe2+ ions. The degree of purification for Fe(II) from solution with a concentration of 10 mg/l is 64 %. Application an electric potential to the microfilter of porous titanium - phosphate titanium increases the degree of purification of Fe(II) to 88 %.

The physicomechanical properties of porous titanium base powder materials

1986 ◽  
Vol 25 (11) ◽  
pp. 909-911 ◽  
Author(s):  
A. G. Kostornov ◽  
L. G. Galstyan ◽  
S. A. Mnatsakanyan ◽  
S. M. Agayan
Keyword(s):  
Porous Titanium ◽  
Physicomechanical Properties ◽  
Powder Materials ◽  
Base Powder

scholarly journals Experimental and Modelling Studies of Water Sorption Properties of Cellulosic Derivative Fibers.

2021 ◽  
Author(s):  
MATHILDE SIMON ◽  
RENE FULCHIRON ◽  
FABRICE GOUANVE
Keyword(s):  
Water Sorption ◽  
Sorption Properties ◽  
Hydroxyl Groups ◽  
Vapor Sorption ◽  
Dynamic Vapor Sorption ◽  
Kinetic Rate ◽  
Modelling Studies ◽  
Kinetic Sorption ◽  
Water Sorption Capacity

Abstract The objective of this study was to understand the chemical modification impact on interactions between water and cellulosic fiber. In that respect, cotton (C), flax (F), viscose (V) and cellulose acetate (CA) were analyzed by using a dynamic vapor sorption analysis. The sorption and desorption isotherms and kinetic curves were modelled using the Park model and the “Parallel Exponential Kinetics” (PEK) model-which allowed an accurate fitting on the whole range of water activity. The obtained sorption properties were correlated to the accessibility and the amount of sorption sites and also to the crystallinity level of the fibers. It was found that V exhibited the highest water sorption capacity due to a higher hydroxyl groups accessibility and a high amorphous fraction, followed up by F, C and CA. In contrast, higher kinetic sorption rate was obtained for CA due to a decrease of the hydroxyl groups within the fibers. Regardless the fiber, the determination of characteristic times showed that the kinetic rate was higher for sorption than desorption.

Validating the Use of Radiotracers as Analogs of Stable Metal Behaviour in Enclosed Aquatic Ecosystem Experiments

1987 ◽  
Vol 44 (S1) ◽  
pp. s251-s259 ◽  
Author(s):  
Robert F. Anderson ◽  
Peter H. Santschi ◽  
Urs P. Nyffeler ◽  
Sherry L. Schiff
Keyword(s):  
Trace Metal ◽  
Water Column ◽  
Metal Removal ◽  
Chemical Properties ◽  
Ionic Form ◽  
Experimental Lakes Area ◽  
Suspended Particulate ◽  
Area North ◽  
Exchange Resins ◽  
Physical And Chemical

Radiotracer experiments were carried out in enclosures in two lakes at the Experimental Lakes Area, North-western Ontario, to study the pathways of trace metal removal from the shallow water columns to the sediments of these lakes. As part of the larger experiment, stable carriers of Fe, Mn, and Zn were added individually to each of three enclosures. Rates of removal to sediments at pH 6.3 and backdiffusion after HCl addition to pH 4.8 of radiotracer 59Fe, 54Mn, and 65Zn were compared to the respective rates of their stable counterparts. Tracer removal and backdiffusion rates in enclosures which received stable carrier additions were further compared with the tracer behaviour in enclosures which received no carrier additions. Radiotracers and stable carriers were removed from the water column at similar rates at pH 6.3, and were remobilized at similar rates from the sediments when the pH of the water column was lowered to 4.8. The presence of the added stable carriers had no effect on the removal or remobilization of Mn or Zn. However, the removal of 59Fe from the water column was slowed slightly by the addition of Fe(III) carrier compared to removal in the other tubes, possibly due to the formation of colloidal phases. These results show that information on the rates of trace metal transport obtained using radiotracers is applicable to stable metal behavior in these freshwater systems. The use of radiotracers to study trace metal geochemistry under natural conditions is preferred to the addition of stable metals which may alter the physical and chemical properties of the suspended particulate matter as occurred after the addition of stable iron. Speciation studies showed that adsorption to ion exchange resins does not provide a reliable indication of the ionic form of metals in lake water.

scholarly journals Comparison of promoter-specific events during transcription initiation in mycobacteria

Microbiology ◽  
2010 ◽  
Vol 156 (7) ◽  
pp. 1942-1952 ◽  
Author(s):  
Arnab China ◽  
Priyanka Tare ◽  
Valakunja Nagaraja
Keyword(s):  
Protein Interactions ◽  
Transcription Initiation ◽  
Kinetic Properties ◽  
Kinetic Rate ◽  
Rate Limiting Step ◽  
Equilibrium Binding ◽  
Transcription Process ◽  
Kinetic Rate Constants ◽  
Rate Limiting ◽  
Kinetics Of

DNA–protein interactions that occur during transcription initiation play an important role in regulating gene expression. To initiate transcription, RNA polymerase (RNAP) binds to promoters in a sequence-specific fashion. This is followed by a series of steps governed by the equilibrium binding and kinetic rate constants, which in turn determine the overall efficiency of the transcription process. We present here the first detailed kinetic analysis of promoter–RNAP interactions during transcription initiation in the σ A-dependent promoters P rrnAPCL1 , P rrnB and P gyr of Mycobacterium smegmatis. The promoters show comparable equilibrium binding affinity but differ significantly in open complex formation, kinetics of isomerization and promoter clearance. Furthermore, the two rrn promoters exhibit varied kinetic properties during transcription initiation and appear to be subjected to different modes of regulation. In addition to distinct kinetic patterns, each one of the housekeeping promoters studied has its own rate-limiting step in the initiation pathway, indicating the differences in their regulation.

Effect of the chemical composition of solose K carboxylic cation-exchange resins of their sorption properties

1984 ◽  
Vol 26 (6) ◽  
pp. 1326-1332
Author(s):  
Ye.I. Mal'ko ◽  
A.G. Boldyrev ◽  
Ye.L. Vinogradov ◽  
Yu.Ya. Dumpis ◽  
A.A. Tager
Keyword(s):  
Chemical Composition ◽  
Cation Exchange ◽  
Sorption Properties ◽  
Cation Exchange Resins ◽  
Exchange Resins

Acid-base and sorption properties of amorphous titanium phosphate

2013 ◽  
Vol 55 (4) ◽  
pp. 392-398 ◽  
Author(s):  
M. V. Maslova ◽  
A. S. Chugunov ◽  
L. G. Gerasimova ◽  
N. V. Konovalova
Keyword(s):  
Titanium Phosphate ◽  
Sorption Properties ◽  
Acid Base

scholarly journals Sorption Removal of Fluorine Ions, Incoming with the Recycling Zinc-Bearing Materials

2017 ◽  
Vol 2 (2) ◽  
pp. 121 ◽  
Author(s):  
Mamyachenkov S.V. ◽  
Egorov V.V. ◽  
Starkov A.M.
Keyword(s):  
Cation Exchange ◽  
Strong Acid ◽  
Inorganic Sorbent ◽  
Composite Sorbents ◽  
Cation Exchange Resins ◽  
Bearing Materials ◽  
Acid Cation ◽  
Fluorine Ions ◽  
Exchange Resins ◽  
Principal Possibility

<p>The possibility of using inorganic sorbent, iron oxyhydrate (IOH) to remove F<sup>-</sup> ions from technological solutions of zinc production is considered in this article. The principal possibility of the use of ion-exchange resins as carriers modified by IOH is considered. The formation of the active substance on cation-exchange resins was studied. It was shown that the most durable composite sorbents were obtained using strong-acid cation-exchange resins with SO<sup>3-</sup>- groups. A method for introducing IOH into the structure of carrier materials and obtaining composite sorbents is described. The strong acid cation exchanger KU-2×8 is recommended as the basis of the composite. </p>

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