scholarly journals Glauconite as a sorbent of 4-nitrophenol

2021 ◽  
Vol 21 (2) ◽  
pp. 152-158
Author(s):  
Tatiana M. Makhova ◽  
◽  
Sergei Yu. Doronin ◽  
Keyword(s):  
Distribution Coefficient ◽  
Sorption Properties ◽  
Aqueous Environment ◽  
Saratov Region ◽  
And Shifts ◽  
Langmuir And Freundlich Equations ◽  
Structure In Solution ◽  
Potential Use ◽  
Sorption Characteristics ◽  
Sorption Time

The sorption properties of glauconite from Beloozersk deposits (Saratov region) for 4-nitrophenol (4-NF) have been investigated. The effect of glauconite on pH and 4-nitrophenol structure in solution is estimated. It is shown that glauconite increases pH of aqueous environment to 8 and shifts the equilibrium towards the formation of aci-form 4-NF. The conditions of sorption 4-NF by glauconite are established: the sorption time 20 min, the mass of the sorbent (0.50–1.0) g. The isotherm of sorption by 4-NF glauconite has been obtained; its interpretation is given using the Langmuir and Freundlich equations. The main quantitative sorption characteristics of glauconite such as recovery (R = 64%), distribution coefficient (D = 88) and the Langmuir and Freundlich constants for 4-nitrophenol are calculated. These experiments indicate the potential use of the glauconite from Beloozersk deposits (Saratov region) for 4-NP from various waters.

Phosphorus sorption in relation to soil properties for the major soil types of South-Western Australia

Soil Research ◽  
1991 ◽  
Vol 29 (5) ◽  
pp. 603 ◽  
Author(s):  
B Singh ◽  
RJ Gilkes
Keyword(s):  
Regression Analysis ◽  
Western Australia ◽  
Stepwise Regression ◽  
Clay Content ◽  
Soil Types ◽  
Phosphorus Sorption ◽  
P Sorption ◽  
Agricultural Areas ◽  
Langmuir And Freundlich Equations ◽  
Sorption Characteristics

The P sorption characteristics of 97 soils that are representative of the agricultural areas of Western Australia were described using Langmuir and Freundlich equations. The Langmuir P maximum (xm) ranged from 11 to 2132 �g g-1 soil and the Freundlich k coefficient ranged from 1 to 1681. Clay content, DCB Fe and Al, oxalate Fe and AL, and pyrophosphate Al were positively related to xm and k. By using stepwise regression analysis, the combination of DCB and oxalate-soluble A1 predicted more than 75% Of the variation in the P sorption coefficients. Reactive Al compounds may thus be responsible for much of the P sorption by these soils. Soil pH in 1 M NaF (pH 8.2), which is normally used for the detection of allophanic material, was strongly related to the P sorption coefficients and might therefore be used as a quick test for predicting the P sorption capacity of soils.

scholarly journals Mini-review on Natural Disintegrants in Pharmaceutical Formulations

2021 ◽  
pp. 52-56
Author(s):  
S. U. Kankanamge ◽  
A. G. K. Neranja ◽  
K. D. S. Sandarenu
Keyword(s):  
Pharmaceutical Formulations ◽  
Nutritional Supplement ◽  
Water Soluble ◽  
Aqueous Environment ◽  
Natural Polymers ◽  
Disintegration Time ◽  
Water Soluble Drug ◽  
Tablet Formulations ◽  
Potential Use ◽  
Poorly Water Soluble Drug

Disintegrants are agents which are integrated to tablets and some encapsulated formulations in order to promote the breakup of the tablet and capsule “slugs” into more small fragments in an aqueous environment which thereafter increment the available surface area and promoting a more rapid release of the drug substance.  The development of new excipients for potential use as disintegrant agent in tablet formulations continues to be of interest. This is because different disintegrant agents can be useful in promoting penetration of moisture and dispersion of the tablet matrix and disintegration of tablet has received considerable attention at present as an essential step in obtaining fast drug release. Natural polymers such as starches, gums, mucilage, and dried fruits utilized as binder, diluent, and disintegrants to increase the solubility of poorly water-soluble drug, decrease the disintegration time, and provide nutritional supplement. Natural disintegrants are safe and economical than synthetic disintegrants such as Polyvinylpyrrolidone (PVP). Therefore, in the present review, an attempt has been made to reveal the importance of the natural disintegrants in the pharmaceutical formulations.

Study on Property of Ti-Based Nonevoparobal Getter

2010 ◽  
Vol 146-147 ◽  
pp. 212-216
Author(s):  
Teng Fei Li ◽  
Yan Zhang ◽  
Xiu Ying Wei ◽  
Peng Yuan ◽  
Chang Hui Mao
Keyword(s):  
Particle Size ◽  
Mechanical Strength ◽  
Titanium Powder ◽  
Sorption Properties ◽  
Average Particle ◽  
Particle Sizes ◽  
Metallurgical Technology ◽  
Titanium Powders ◽  
Different Gases ◽  
Sorption Characteristics

The getters composed with Titanium and Zr-V-Fe were prepared by conventional powder metallurgical technology. The sorption properties and mechanical strength of the Ti-Zr-V-Fe getter prepared with three different average particle sizes of Titanium powder were investigated. The results showed that the smaller Titanium powders particle size can effectively improve the property of the nonevoparobal getter, but if particle size is too small, the sorption of the getter will decrease. The getter which was added with Titanium powder of 48μm has the best hydrogen sorption capability. With the decrease of the size of Titanium powder, mechanical strength will be improved remarkably. In the paper, the sorption characteristics for different gases were analyzed initially and the understanding for Zr-based getter is more extensive. The results show that the getters can adsorb activated gases, such as H2, N2 and CO. The pumping speed for H2 is best than that for N2 and CO.

Treatment of Real Wastewater from Organic Contaminants by Using Biochar

2021 ◽  
Vol 1038 ◽  
pp. 258-265
Author(s):  
Edita Baltrėnaitė-Gedienė ◽  
Valentyna Iurchenko ◽  
Elena Lebedeva ◽  
Oksana Melnikova ◽  
Natalia Kosenko
Keyword(s):  
Sorption Capacity ◽  
Organic Contaminants ◽  
Paper Mill ◽  
High Specific Surface Area ◽  
Sorption Properties ◽  
Water And Wastewater Treatment ◽  
Surface Functionality ◽  
Water And Wastewater ◽  
Paper Mill Wastewater ◽  
Sorption Characteristics

In a number of water use schemes (water and wastewater treatment), physicochemical treatment methods, in particular adsorption, have been successfully used. However, widespread adoption of these methods is hindered by the high cost of sorbents. One of the promising solutions to these problem of sorption treatment is the use of biochar. Due to its high specific surface area, well-developed porous structure, and surface functionality, biochar has been used as inexpensive adsorbent. The purpose of the laboratory experiments is to determine the sorption properties of biochar obtained from pine – sorption capacity, sorption rate, and purification effect – while removing organic contaminants from real paper mill wastewater. The sorption properties of biochar were studied under static and dynamic conditions, varying the size of the fractions, and processing time. The sorption characteristics of biochar of all the studied fractions were established and it was shown that the most effective sorbent in removing organic contaminants is the 1-biochar’s fraction of (sorption capacity of 11.9 mg of COD per of sorbent). The data obtained enable theoretically substantiate the presence of certain functional groups on the surface of the researched biochar, as well as to develop technological regimes for the treatment of natural and waste waters of a certain composition with its help.

scholarly journals Tocopheryl Succinate-Induced Structural Changes in DPPC Liposomes: DSC and ANS Fluorescence Studies

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2780
Author(s):  
Grażyna Neunert ◽  
Jolanta Tomaszewska-Gras ◽  
Stanislaw Witkowski ◽  
Krzysztof Polewski
Keyword(s):  
Zeta Potential ◽  
Liquid Crystalline ◽  
Structural Changes ◽  
Aqueous Environment ◽  
Biophysical Parameters ◽  
Scanning Calorimetry ◽  
Selective Toxicity ◽  
Fluorescence Studies ◽  
Tocopheryl Succinate ◽  
And Shifts

Recent studies show that alpha-tocopheryl succinate (TS) exhibits selective toxicity against cancer cells. In this study, we investigated the effect of TS’s presence on the physico-chemical and structural properties of DPPC liposomes using fluorescence parameters (intensity, lifetime, and position of emission maximum) of 1-anilino-8-naphtalene sulphonate (ANS), differential scanning calorimetry (DSC) and zeta potential methods. Increasing the TS presence in the DPPC gel phase produced ANS fluorescence enhancement with a hypsochromic shift of the maximum. The zeta potential measurements show an increase in the negative surface charge and confirmed that this process is connected with the hydrophobic properties of dye, which becomes located deeper into the interphase region with a progressing membrane disorder. Temperature dependence studies showed that an increase in temperature increases the ANS fluorescence and shifts the ANS maximum emission from 464 to 475 nm indicating a shift from hydrophobic to a more aqueous environment. In the liquid crystalline phase, the quenching of ANS fluorescence occurs due to the increased accessibility of water to the ANS located in the glycerol region. The DSC results revealed that increasing the presence of TS led to the formation of multicomponent DSC traces, indicating the formation of intermediate structures during melting. The present results confirmed that TS embedded into the DPPC membrane led to its disruption due to destabilisation of its structure, which confirmed the measured biophysical parameters of the membrane.

scholarly journals INFLUENCE OF THE NATURE OF THE MODIFIER ON THE SORPTION PROPERTIES OF SHANKANAI ZEOLITE

2021 ◽  
Vol 3 ◽  
pp. 36-46
Author(s):  
R.А. Kaiynbayeva ◽  
◽  
N.N. Kojabekova ◽  
G.Sh. Sultanbayeva ◽  
А.А. Аgatayeva ◽  
...  
Keyword(s):  
Hydrochloric Acid ◽  
Cation Exchange ◽  
Natural Zeolite ◽  
Physicochemical Analysis ◽  
Sorption Properties ◽  
Zeolite A ◽  
Optimal Temperature ◽  
Modified Zeolite ◽  
Modified Zeolites ◽  
Sorption Characteristics

Sorbents modified with hydrochloric acid and chitosan based on the Shankanai bridge formation zeolite were obtained, and the effect of drying temperature on the sorption properties of sorbents was studied. It was found that 25 °C is the optimal temperature for obtaining acid-modified zeolite. A chitosan-modified sorbent with good sorption characteristics can be obtained at 25 °C with cation-exchange (COE 68.05 mg-eq/g) and 70°C with anion-exchange (SEC 70.16 mg-eq/g) properties. Physicochemical analysis of modified zeolites showed an increase in the size of voids and channels on the surface of acid-modified zeolite, and when modified with chitosan, the latter is crosslinked with the surface of natural zeolite.

scholarly journals Sorption characteristics of dietary hard candy

2011 ◽  
Vol 21 (No. 3) ◽  
pp. 97-99 ◽  
Author(s):  
M. Hadjikinova ◽  
N. Menkov ◽  
D. Hadjikinov
Keyword(s):  
Gravimetric Method ◽  
Sorption Isotherms ◽  
Sorption Properties ◽  
Equilibrium Isotherms ◽  
Sugar Alcohols ◽  
Peleg Model ◽  
Sorption Characteristics ◽  
Hard Candy

This investigation is aimed at the determination of the effect of sugar alcohols sorbitol and isomalt on the sorption properties of hard candy. The equilibrium isotherms of two kinds of hard candy containing sorbitol and isomalt, respectively, were obtained by means of the static gravimetric method at a temperature of 20°C. The isomalt-containing candy proved to sorb less moisture under equal conditions. The Peleg model was found suitable for the description of the sorption isotherms of hard candy.  

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