The Dependence of the Aggregate Stability to Concrete of Modifying Additives Based on Halloysite Nanotubes in Water Environment on the Character of the Stabilizer

2019 ◽  
Vol 945 ◽  
pp. 287-292 ◽  
Author(s):  
N.P. Lukutsova ◽  
I.A. Kulesh ◽  
S.N. Golovin ◽  
S.A. Andrushin
Keyword(s):  
Aquatic Environment ◽  
Water Environment ◽  
Aggregate Stability ◽  
Halloysite Nanotubes ◽  
Maximum Efficiency ◽  
Aggregative Stability ◽  
Ultrasonic Dispersion ◽  
Aqueous Dispersions ◽  
Modifying Additives ◽  
Active Substances

The stabilizer nature effect on the aggregative stability of the modifying concrete additives based on halloysite nanotubes in the aquatic environment is shown. The chemical composition and morphology of halloysite nanotubes and their additives, obtained by ultrasonic dispersion in the aquatic environment of the surfactant, are studied. The influence on the processes of charge stabilization on the outer and inner surface of halloysite nanotubes is determined. The dependence of nanotube sizes and specific surface area on the stabilizer type, the time of ultrasonic dispersion, and additive storage is revealed. The stabilization mechanisms of aqueous dispersions of modifying additives based on halloysite nanotubes with anion-and cation-active substances are considered. It is established that the polynaphthalenesulfonate-based modifier S-3 has got the maximum efficiency as a stabilizer of aqueous dispersions of modifying concrete additives with halloysite nanotubes.

scholarly journals Study on Analysis and Sedimentation of Alumina Nanoparticles

2019 ◽  
Vol 16 (3) ◽  
pp. 510 ◽  
Author(s):  
Xuehong Zheng ◽  
Yuehan Li ◽  
Ding Chen ◽  
Airong Zheng ◽  
Qikang Que
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Ecological Risk ◽  
Sedimentation Rate ◽  
Aquatic Environment ◽  
Artificial Seawater ◽  
Alumina Nanoparticles ◽  
Natural Seawater ◽  
Ultrasonic Dispersion ◽  
Risk Effects

Dispersion and aggregation behavior of nanoparticles in aquatic environment may be affected by pH, salinity, and dissolved organic matter, which would change its ecological risk. Effects of time, power and temperature on the alumina nanoparticles (nano-Al2O3) ultrasonic dispersion in water were discussed. Al2O3 had a best ultrasonic dispersion for 30 min at 105 W and 30 °C. The concentration of Al2O3 could be measured by ultraviolet (UV) spectrophotometer, and the method was efficient and accurate. Furthermore, the sedimentation rate of Al2O3 was related to pH, salinity, and its concentration in the artificial seawater. When pH was 7.31, approaching the isoelectric point of Al2O3, they aggregated and settled fastest. Settlement coefficient (k) of Al2O3 increased by 3 and 2.7 times while the salinity and its concentration increased. The sedimentation rate was higher in natural seawater than that in artificial seawater. All results indicated that nano-Al2O3 would be removed in aquatic environment.

scholarly journals An Effectual Biosorbent Substance for Removal of Manganese Ions from Aquatic Environment: A Promising Environmental Remediation Study with Activated Coastal Waste of Zostera marina Plant

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Fatih Deniz ◽  
Elif Tezel Ersanli
Keyword(s):  
Zostera Marina ◽  
Aquatic Environment ◽  
Environmental Remediation ◽  
Water Environment ◽  
Freundlich Isotherm ◽  
Manganese Concentration ◽  
Manganese Ions ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Kinetic Equilibrium

In the present research paper, a biosorptive remediation practice for an aqueous medium sample polluted with manganese ions was implemented using the activated coastal waste of the Zostera marina plant. This is the first report in the literature on the utilization of current modified biological waste as a biosorbent substance for the removal of manganese ions from the water environment. The analyses of biosorbent characterization, environmental condition, kinetic, equilibrium, and comparison were performed to introduce the ability of prepared biosorbent for the removal of manganese from the aquatic medium. The biosorbent matter has a rough surface with numerous cavities and cracks and various functional groups for the biosorption of manganese. The environmental conditions significantly affected the manganese purification process, and the optimum working conditions were determined to be biosorbent quantity of 10 mg, pH of 6, manganese concentration of 30 mg L-1, and time of 60 min. The pseudo-second-order model best explained the kinetic data of biosorption operation. The biosorption equilibrium data were best described by the Freundlich isotherm. According to the Langmuir equilibrium model, the maximum purification potency was estimated to be 120.6 mg g-1. The comparison work revealed that the activated coastal waste of the Z. marina plant could be utilized as an effectual and promising biosorbent substance for the remediation of an aquatic environment contaminated with manganese ions.

scholarly journals Research of the mineral additives influence on aggregative stability of foam concrete mixture

2021 ◽  
Vol 2131 (4) ◽  
pp. 042034
Author(s):  
E Bartenjeva
Keyword(s):  
Aggregate Stability ◽  
Stable Structure ◽  
Concrete Mixture ◽  
Aggregative Stability ◽  
Cement Stone ◽  
Foam Concrete ◽  
Effect Of Additives ◽  
Modifying Effect ◽  
The Stability ◽  
Mineral Additives

Abstract An effective method for increasing the aggregate stability of non-autoclave heat-insulating foam concrete is proposed. This material is prepared using a two-stage technology on a turbulent-type installation. An increase in the stability of the foam in the mortar mixture by 9.5-23% has been established. An increase in the viscosity of the foam concrete mixture by 13.5% was revealed. Wollastonite and diopside are actively involved in the formation of a stable structure of foam concrete and are structurally modifying centers. The introduction of mineral additives contributes to the formation of a homogeneous stable structure of non-autoclave foam concrete. Thus, an increase in the stability of the cellular system in the technology of non-autoclave cement-ash foam concrete is possible due to the control of the processes of structure formation when using dispersed mineral additives of wollastonite and diopside. Due to the structural-modifying effect of additives as crystallization centers for neoplasms, a more complete hydration of the cement and a strong contact of the additives with the cement stone should be ensured

scholarly journals Learning the basics of applied swimming cadets

2019 ◽  
Vol 2019 (3) ◽  
pp. 197-203
Author(s):  
Андрей Третьяков ◽  
Andrey Tretyakov ◽  
Алексей Ткаченко ◽  
Alexey Tkachenko ◽  
Владимир Дрогомерецкий ◽  
...  
Keyword(s):  
Experimental Data ◽  
Crime Prevention ◽  
Aquatic Environment ◽  
Water Environment ◽  
Educational Process ◽  
Educational Institutions ◽  
Practical Training ◽  
Educational Organizations ◽  
Know How ◽  
Internal Affairs

The paper presents the rationale for solving the problem of teaching the basics of applied swimming cadets of educational institutions of the Ministry of internal Affairs. The need for training these skills of cadets is high. Many students in the educational organizations of the Ministry of internal Affairs do not know how to assist and counteract the criminal in the water environment. Despite this, the future police during execution of official duties, the duty to assist, where appropriate, and within the framework of crime prevention, respectively, to the persecution, to oppose and delay in the aquatic environment of the offender. These circumstances determined the need to develop methods of teaching the basics of applied swimming cadets of educational institutions of the Ministry of internal Affairs. It was supposed to carry out the analysis of level of readiness of cadets in questions of knowledge of bases of applied swimming. To develop a program of training students in the basics of applied swimming and test its effectiveness. In the course of the study, pedagogical, practical, mathematical and statistical methods were used. In the course of the study it was found that the proposed program of practical training and methodology for teaching the basics of applied swimming is effective. This is indicated by the experimental data obtained as a result of testing of cadets. This fact allows us to recommend an experimental technique for use in the educational process of students.

Functional construction of a water-stable Tb-coordination polymer luminescent sensor for highly selective detection of picric acid in an aquatic environment

2019 ◽  
Vol 48 (46) ◽  
pp. 17349-17354 ◽  
Author(s):  
Wei Liu ◽  
Chengdong Liu ◽  
Chunyang Chen ◽  
Xin Huang ◽  
Weisheng Liu
Keyword(s):  
Coordination Polymer ◽  
Aquatic Environment ◽  
Recognition Performance ◽  
Picric Acid ◽  
Water Environment ◽  
Selective Detection ◽  
Luminescent Sensor ◽  
Efficient Detection ◽  
Luminescence Performance

In order to achieve convenient and efficient detection of picric acid in a water environment, based on function-oriented strategy, we combine luminescence performance with recognition performance, taking into account the application conditions.

THE ROLE OF THE FUTUROLOGICAL CONCEPTS OF THE XX CENTURY IN THE SPATIAL ORGANIZATION OF MODULAR ARCHITECTURAL OBJECTS IN THE AQUATIC ENVIRONMENT

2020 ◽  
pp. 3-12
Author(s):  
Svetlana Kizilova
Keyword(s):  
Aquatic Environment ◽  
Spatial Organization ◽  
Water Environment ◽  
Climatic Conditions ◽  
Point Of View ◽  
Research Approach ◽  
Floating Structures ◽  
Natural Systems ◽  
Modular Structures

The aim of the research is identifying the role of the futurological theories of the XX century in the mod-ern design of modular structures in the water environment. The leading research approach is based on the analysis of the principles of habitat organization from the point of view of the main visionary concepts of the XX century, which developed the idea of life on the water in the future, such as: architectural "metabolism", "mobile" architecture, arсology, architectural biomimetics and bionics. The approaches outlined in the framework of the futurological concepts of the last century include modularity, interchangeability of struc-tural elements, adaptation to changes in climatic conditions, application of the principles of growth and ag-gregation in natural systems to the architecture. The revealed approaches have been elaborated in the contemporary architectural concepts devoted to the development of the extreme water environment. Based on the analysis of implemented and conceptual pro-jects of the floating structures on the water, the types of spatial organization of modules are identified: line-ar, continuous, multiple, arbitrary, centralized. A graphical diagram illustrating the mechanism of aggrega-tion of modules for each type is made. These typologies can be applied in further design and experimental developments and theoretical studies in the field of biosphere-compatible architecture in the context of the aquatic environment.

Durability of fingerprints in aquatic environment

2014 ◽  
Vol 284 ◽  
pp. 74-77
Author(s):  
Iwona Szymańska ◽  
Keyword(s):  
Aquatic Environment ◽  
Water Environment ◽  
Flowing Water ◽  
Water Reservoirs ◽  
Stagnant Water ◽  
Significant Difference ◽  
Dependent Variables

The aim of the study was to determine the influence of environment of stagnant and flowing water on the durability of fingerprints. The fingerprints immersed in two stagnant water reservoirs and 2 flowing water reservoirs were researched. There were two dependent variables: the contrast between fingerprints ridges and valleys and the contrast between the print and space located beyond it. It was found that fingerprints in stagnant water reservoirs have average longer durability and there is a significant difference in durability within one type of water environment. The contrast between fingerprints ridges and valleys turned out to be the most suitable dependent variable for the research.

Modeling of microbial interaction in degradable polymers under simulated water environment

2021 ◽  
Author(s):  
Prasanth Babu Ramesh ◽  
Shobha Shukla ◽  
Sumit Saxena ◽  
Tanveer Adyel
Keyword(s):  
Microbial Communities ◽  
Aquatic Environment ◽  
Water Environment ◽  
Simulation Models ◽  
Microbial Colonization ◽  
Degradable Polymers ◽  
Plastic Pollution ◽  
Radiation Chemical ◽  
Weathering Processes ◽  
And Behavior

<p>Nearly 80% of oceanic plastic waste is from land-based sources including degradable polymers. The recent trend towards the use of degradable polymers in the form of photodegradable and biodegradable polymers promises to be a sustainable solution to plastic pollution, whereas microplastics (MPs) impose higher ecological risk due to limited knowledge of its physicochemical properties and behavioral dynamics in the aquatic environment.  This study is aimed at modeling the effect of the weathering process of degradable microplastics by plastic surface-based microbial communities. Source-specific degradable polymers with different weathering processes such as abrasion, solar radiation, microbial colonization, UV radiation, chemical, and thermal oxidation, and other environmental factors were assessed.  Cluster analysis of efficient degradable microorganisms over MPs weathering conditions highlighted to understand the microbial kinetics.  Simulation models are also used to mechanistically characterize and analyze the behavioral patterns of microorganism colonization of MPs and its weathering influence are discussed in detail. Multispecies microbial colonization is largely understudied and experimentally exhaustive to quantify, nevertheless, there is minimal literature on the parameterization of such models and more experimental work is needed to better optimize the parameters in these models for a broad range of microbial communities and microplastic leachate chemicals.  This work not only provides a better understanding of the fate and behavior of degradable microplastics in the aquatic environment, but these findings also serve as a requisite to better design and optimize the essential parameters for experimental strategies for the development of environmentally friendly novel polymers.</p>

scholarly journals Increase of aggregative and sedimentation stability of slag suspensions by ultrasound

2019 ◽  
Vol 110 ◽  
pp. 01061
Author(s):  
Svetlana Samchenko ◽  
Irina Kozlova ◽  
Оlga Zemskova ◽  
Ekaterina Baskakova
Keyword(s):  
Building Materials ◽  
Aqueous Dispersion ◽  
Micelle Formation ◽  
Cement Matrix ◽  
Aggregative Stability ◽  
Mechanical Mixing ◽  
Dispersion Parameters ◽  
Ultrasonic Dispersion ◽  
Sedimentation Stability ◽  
Object A

The paper discusses the relevance of the use of metallurgical wastes crushed to a fine state in the production of building materials. Domain granulated slag (DGS) was used as a research object. A method for introducing fine ground slag (FGS) into the cement composition in the form of a slag suspension instead of mixing water has been developed. To establish the uniform distribution of FGS particles in the cement matrix, the behavior of slag particles in an aqueous dispersion medium was previously studied. The optimal parameters of ultrasonic dispersion of slag suspensions are established: the frequency of ultrasonic vibrations is 44 kHz; temperature of dispersion - 25±2°C; dispersion time - 15 min. It has been established that the application of UST to slag suspensions with the observance of optimal dispersion parameters can increase the aggregative and sedimentation stability of the FGS suspension by 2–3 times as compared with mechanical mixing, accelerate the micelle formation process, and enhance the electrostatic factor of aggregative stability.

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