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

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

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.  

scholarly journals Biocompatible Dispersants for Carbon Nanomaterials

2021 ◽  
Vol 11 (22) ◽  
pp. 10565
Author(s):  
Hugh Mohan ◽  
Michał Bartkowski ◽  
Silvia Giordani
Keyword(s):  
Mechanical Properties ◽  
Aqueous Solutions ◽  
Biomedical Applications ◽  
Carbon Nanomaterials ◽  
Factors Affecting ◽  
Different Types ◽  
Unique Chemical

Carbon nanomaterials (CNMs) are a fascinating class of materials that have gained considerable interest in recent years. Their favourable biocompatibility, combined with unique chemical and mechanical properties, has attracted scientists from various disciplines. A significant hurdle in their deployment in biomedical applications is their hydrophobicity in their pristine form. This review surveys and discusses existing non-covalent methods of functionalising CNMs with biocompatible dispersants to facilitate their incorporation into aqueous solutions. Different types of dispersants will be examined and compared as well as the factors affecting their efficiency. This work seeks to provide a compilation of the various methods employed in producing biocompatible CNM dispersions.

scholarly journals Purification of Colored Aqueous Solutions in the Adsorption Process on Magnetite Modified with Polymers

Proceedings ◽  
2019 ◽  
Vol 16 (1) ◽  
pp. 56
Author(s):  
Jędrys-Wolska ◽  
Korus
Keyword(s):  
Aqueous Solutions ◽  
Industrial Wastewater ◽  
Adsorption Process ◽  
Ph Value ◽  
Purification Process ◽  
Environmental Aspects ◽  
Chemical Structures ◽  
Different Types ◽  
The Subject ◽  
Dye Solutions

Colored industrial wastewater is a threat in many environmental aspects. As such, there is a need to find more effective methods for its purification. This article presents a brief overview of available methods for removing dyes from aqueous solutions, among them the adsorption process, which is the subject of this study. The course of preliminary tests on the process of cleaning dye solutions in the adsorption process is presented. Unmodified magnetite and magnetite modified with polymers were used as adsorbents. The synthesis of particular types of magnetite, the adsorption process, as well as the methods of further analyzes are described. As part of the work, the focus was put on a comparison of the effectiveness of the purification process for different types of adsorbents in relation to selected dyes. The varied conditions of the process were also analyzed. It has been shown that magnetite is an adsorbent that is easy to use, allowing effective separation of dyes of various chemical structures from aqueous solutions. The effectiveness of the process depends on the type of dye and on the pH value and can be increased in relation to some dyes by using magnetite modification with selected polymers.

scholarly journals Electrospun Carbon Nanofiber Membranes for Filtration of Nanoparticles from Water

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Mirko Faccini ◽  
Guadalupe Borja ◽  
Marcel Boerrigter ◽  
Diego Morillo Martín ◽  
Sandra Martìnez Crespiera ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Natural Waters ◽  
Carbon Nanofiber ◽  
Metal Oxide Nanoparticles ◽  
Precursor Solution ◽  
Consumer Products ◽  
Free Standing ◽  
Fiber Size ◽  
Different Types ◽  
Nanofiber Membranes

Nowadays, hundreds of consumer products contain metal and metal oxide nanoparticles (NP); this increases the probability of such particles to be released to natural waters generating a potential risk to human health and the environment. This paper presents the development of efficient carboneous nanofibrous membranes for NP filtration from aqueous solutions. Free-standing carbon nanofiber (CNF) mats with different fiber size distribution ranging from 126 to 554 nm in diameter were produced by electrospinning of polyacrylonitrile (PAN) precursor solution followed by thermal treatment. Moreover, tetraethoxyorthosilicate was added to provide flexibility and increase the specific surface area of the CNF. The resulting membranes are bendable and mechanically strong enough to withstand filtration under pressure or vacuum. The experimental results of filtration revealed that the fabricated membranes could efficiently reject nanoparticles of different types (Au, Ag, and TiO2) and size (from 10 to 100 nm in diameter) from aqueous solutions. It is worth mentioning that the removal of Ag NP with diameters as small as 10 nm was close to 100% with an extremely high flux of 47620 L m−2 h−1 bar−1.

Fixed bed adsorption of diquat dibromide from aqueous solution using carbon nanotubes

RSC Advances ◽  
2015 ◽  
Vol 5 (76) ◽  
pp. 61508-61512 ◽  
Author(s):  
Anthony B. Dichiara ◽  
Samuel F. Harlander ◽  
Reginald E. Rogers
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Wastewater Treatment ◽  
Aqueous Solutions ◽  
Fixed Bed ◽  
Fixed Bed Column ◽  
Fixed Bed Adsorption ◽  
Different Types

Carbon nanotubes are increasingly studied as attractive adsorbents for wastewater treatment. The present work exploits the attributes of different types of CNTs in a fixed bed column for the dynamic uptake of diquat dibromide from aqueous solutions.

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