As a soft material, superabsorbent polymers (SAPs) can absorb a large amount of water and retain it at a certain pressure (Islam et al. 2015).Thus, SAPs have potential applications in hygiene (Wu et al. 2008), horticulture (Khan et al. 2009), agriculture (Seki et al. 2014), and biological and tissue engineering (Divakaran et al. …
Superabsorbent polymers (SAPs) can absorb a large amount of water and find broad applications in various industries. There are many reports on the synthesis and structural modification techniques to improve the water absorption property of SAPs. However, we see few studies on the comparison and integration of these techniques. In …
The intercalation of sodium salt into the bentonite surface give rise to the specific surface area and total pore volume from 120.34 to 426.91, m2/g and 0.155 to 0.225 cm3/g, respectively ...
However, discussions based on experiments involving a bentonite, Kunigel V1 (K_V1), are extended to the following issues: (a) the effect of wi on peq; (b) pore water density …
The swelling process of bentonite is vital for judging the time required for completing the swelling, estimating the engineering safety, and organizing the construction plan. Many factors affect the swelling process, and the underlying mechanisms still require to be clearly explained. In this paper, the swelling process of commercial bentonite in …
Sodium-based bentonite can be utilized as the main slurry ingredient in drilling fluid. The attributes of sodium-based bentonite include high cost, high water swelling rate, sluggish water adsorption speed, good dispersion in water, and thixotropy. ... The result showed that the oil absorption value and water absorption rate were …
A series of composite and nanocomposite hydrogels were synthesized by copolymerization reaction of partially neutralized acrylic acid (SA) on bentonite micropowder (BT) using N,N ′-methylenebisacrylamide (MBA) as a crosslinker and potassium persulfate (I) as an initiator in aqueous solution. The influences of Na +-BT, …
This study starts from a question: how would initial water content (wi) affect equilibrium swelling pressure (peq) of compacted bentonites in swelling pressure tests (ps tests)? However, discussions based on experiments involving a bentonite, Kunigel V1 (K_V1), are extended to the following issues: (a) the effect of wi on peq; (b) pore water …
The original bentonite, sodium-based bentonite, BIG and composite structure was characterized by X-ray fluorescence (XRF), nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy ...
With the increase of ionic strength, the content of total water fi and permeated hydrated water (accounting for 69%–95%) in bentonite decreases gradually, whereas the surface …
Sodium-based bentonite can be utilized as the main slurry ingredient in drilling fluid. The attributes of sodium-based bentonite include high cost, high water …
In contrast, calcium bentonite, which contains Ca 2+ ions, is less susceptible to water absorption, and is known as a lowswelling bentonite [32,33].
This study aims to investigate the wetting and swelling pressure characteristics of unsaturated compacted Ca-bentonite in contact with a cement-equilibrated fluid, focusing on the interface between the bentonite buffer and host rock. Water retention and swelling pressure tests were conducted on unsaturated compacted …
The buffer material that makes up the geological disposal system of high-level waste swells by contact with groundwater and seals space with rock mass and fractures in rock mass. The buffer material has a function of mechanical buffer with rock pressure, and swelling stress is important in this case. The alteration of bentonite may …
DOI: 10.1016/J.MINPRO.2011.01.001 Corpus ID: 97523761; Rheology of sodium and calcium bentonite-water dispersions: Effect of electrolytes and aging time @article{AbuJdayil2011RheologyOS, title={Rheology of sodium and calcium bentonite-water dispersions: Effect of electrolytes and aging time}, author={Basim Abu‐Jdayil}, …
It ranks first in the world for bentonite production, which, however, is mainly low-grade calcium bentonite. Compared with sodium-based bentonite, calcium-based bentonite has poor water absorption properties, swelling capacity and cation exchange capacity; in addition, sodium-based bentonite has better dispersibility, suspension …
In this article, we report a novel physical and chemical composite ing system, which was used to successfully prepare high-performance and low-cost composite superabsorbent [poly(sodium acrylic acid) (PAA–Na)] hydrogels based on acrylic acid by free-radical polymerization in a water bath under a nitrogen atmosphere without the use …
Section 250.52.3 of NFPA 70 (2020) states bare, zinc-galvanized, or electrically conductive steel bars or rods, at least 12.7 mm (0.5 in.) in diameter connected continuously, must be encased by at ...
The swelling effect of sodium-bentonite as an additive in water-based drilling sludge with different concentration of polyamine inhibition March 2021 IOP Conference Series Materials Science and ...
A series of composite and nanocomposite hydrogels were synthesized by copolymerization reaction of partially neutralized acrylic acid (SA) on bentonite micropowder (BT) using N,N ...
Typically, bentonite—a non-metallic mineral mainly composed of montmorillonite—is used as a slurry because of its superior swelling properties in water (Fritz 2007), bentonite slurries being essential for stabilizing the excavation faces. Specifically, a layer of filter cake is formed at the tunnel face when the slurries infiltrate …
(2020a) observed that, regardless of direct absorption of liquid water or water vapour, the relationships between w and the basal spacing of montmorillonite in …
Waste recycling plays a critical role in addressing environmental challenges by conserving natural resources, reducing pollution, and mitigating the environmental impact of human activities. However, bentonite has been known to exhibit a propensity for swelling and shrinking in response to changes in moisture content, which can result in …
Postfermentation Treatments and Related Topics. Ron S. Jackson, in Wine Science (Second Edition), 2000 BENTONITE. Bentonite is a form of montmorillonite clay widely employed as a fining agent. It is used in clarifying juice and wines, in removing heat-unstable proteins, and in limiting the development of copper casse. Depending on the …
The swelling rate and swelling potential of the B/S mixtures are significantly reduced, not only due to the increase in salinity of the water (chemical factor), but also …
So, what is sodium bentonite? In simple words, sodium bentonite is a mineral clay with a high water absorption capacity and a high swelling rate that make it a versatile sealant for a wide range of applications. Sodium bentonite is an effective pond sealant, an anti-odor agent for litter, a cleansing agent in wastewater treatment and a …
The work of Elmashad presents a solution for the swelling characteristics of bentonite by measuring the effects of adding chemicals to the soil as sodium chloride, ammonium chloride, lime, and ...
A novel hydrolysis-resistant superabsorbent composite was prepared via the solution polymerization based on acrylic acid (AA) and sodium bentonite (SBT) as …
During the expansion process, cation exchange induced by NaCl solution transforms calcium bentonite into sodium bentonite. Specifically, the swelling of the crystal layer in Na-based bentonite exhibits a slightly greater increase compared to Ca-bentonite and …
Due to the abundant porous structure and the presence of coal gasification slag, the obtained superabsorbent composites exhibited rapid swelling rate and excellent water absorption capability, and the maximum water absorption in distilled water and 0.9 wt% NaCl solution reached 910 g/g and 126 g/g after 30 min, respectively.
Taking advantage of the swelling of sodium type bentonite, the purification of bentonite has been done in industrial processes as well as laboratory research to …
This study characterises the use of calcium based bentonite and sodium based bentonite to stabilize a typical road base layer. Considering two types of aggregates with different geological origin, the laboratory investigation is performed on dry specimens by means of repeated load triaxial tests, which assess the enhancement in stiffness and ...
Postfermentation Treatments and Related Topics. Ronald S. Jackson PhD, in Wine Science (Third Edition), 2008 BENTONITE. Bentonite is a type of montmorillonite clay widely employed as a fining agent. It is used in clarifying juice and wines, in removing heat-unstable proteins, and in limiting the development of copper casse. Depending on the …
Sodium bentonite is added to adsorb the ink pigment after which the cellulose fibers are washed to remove the bentonites which carries the ink pigment with it. Sodium bentonite is also used to prevent agglomeration of pitches, tars, waxes, and resinous material (Murray, 1984). The addition of 0.5% bentonite based on the dry …
