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285234

Sigma-Aldrich

Bentonite

Synonym(s):

Montmorillonite

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About This Item

CAS Number:
1302-78-9
EC Number:
215-108-5
MDL number:
MFCD00130611
UNSPSC Code:
12352300
PubChem Substance ID:
24856869
NACRES:
SB.52
Pricing and availability is not currently available.

form

powder

Quality Level

100

storage temp.

room temp

SMILES string

O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O

InChI

1S/2Al.4O2Si.H2O.3O/c;;4*1-3-2;;;;/h;;;;;;1H2;;;

InChI key

KARVSHNNUWMXFO-UHFFFAOYSA-N

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General description

Bentonite is comprised primarily of the smectite group (montmorillonite) of clay minerals. It is widely used in various industrial applications such as clarification of edible and mineral oils, paints, cosmetics, and pharmaceuticals. It is also used as an adsorbent for the elimination of pollutants from wastewater.[1]
The swelling property of bentonite is used to produce viscous water suspensions for bonding, plasticizing, and suspending applications. The presence of a large surface area of bentonite is due to the colloidal dispersion of the particles is the main reason for its application as an insecticide carrier, an emulsifier, and an emulsion stabilizer.[2]

Application


  • Optimization of Cd (II) removal from aqueous solution by natural hydroxyapatite/bentonite composite using response surface methodology.: This study explores the use of a hydroxyapatite/bentonite composite for the efficient removal of cadmium ions from aqueous solutions, highlighting its potential application in environmental remediation (Desalegn et al., 2023).


  • Acid-activated Sodium Bentonite and Kaolin Clay: Comparative Study by Physicochemical Properties.: This research compares the physicochemical properties of acid-activated sodium bentonite and kaolin clay, focusing on their potential applications in various industrial processes and environmental treatments (Kumar & Lingfa, 2020).


  • Photochemical synthesis of silver nanoparticles on chitosans/montmorillonite nanocomposite films and antibacterial activity.: The research focuses on the synthesis of silver nanoparticles on chitosan/montmorillonite nanocomposite films and their enhanced antibacterial activity, suggesting potential applications in medical and environmental fields (Gabriel et al., 2017).



Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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Certificates of Analysis (COA)

Lot/Batch Number
MKCW5974
0000408268
0000323956
0000408268
0000323956

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Adsorption of methylene blue from aqueous solution by crosslinked chitosan/bentonite composite.
Bulut Y and Karaer H.
Journal of Dispersion Science and Technology, 36(1), 61-67 (2015)
Applications of Bentonite in the Industrial Wastewater Treatment [J]
Xiaotong G and Zhiming Z
Chemical Production and Technology, 3 (2006)
Adsorption of phenol by bentonite
Banat FA, et al.
Environmental Pollution (Barking, Essex : 1987), 107(3), 391-398 (2000)
A Christy Wyckoff et al.
PloS one, 8(3), e58630-e58630 (2013-03-14)
Prions, the infectious agent of scrapie, chronic wasting disease and other transmissible spongiform encephalopathies, are misfolded proteins that are highly stable and resistant to degradation. Prions are known to associate with clay and other soil components, enhancing their persistence and
V V Smirnova et al.
Gigiena i sanitariia, (3)(3), 76-78 (2012-10-24)
Intragastric administration of nanoclay to rats during 28 days led to reductions in the relative weight of the liver, the activity of its conjugating enzymes, the antagonistic activity of bifidoflora, and the hyperproduction of colonic yeast microflora. The findings lead
View All Related Papers

Questions

1–7 of 7 Questions  

  1. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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  2. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

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  3. What grade is this item?

    1 answer

    1. This product is considered a research grade with an assigned quality level of 100. Please see the link below to review additional information regarding product quality levels:
      https://www.sigmaaldrich.com/life-science/quality-and-regulatory-management/m-clarity-program

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  4. What is the cation exchange capacity (CEC) for this bentonite product?

    1 answer

    1. This product has a reference value for cation exchange capacity (CEC) of 90 to 120 meq per gram. Unfortunately, there is no test on the cation exchange capacity on a lot-to-lot basis, so performance cannot be guaranteed for every lot.

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  5. What type of bentonite is it? Calcium bentonite or sodium bentonite or other?

    1 answer

    1. This product is not in the calcium or sodium form. The assigned CAS number for this material is 1302-78-9, which is simply Bentonite or Montmorillonite. The CAS number for calcium bentonite is 1318-93-0 and is more commonly known as Montmorillonite K 10 or K30. See the link below to review these product options:
      https://www.sigmaaldrich.com/US/en/search/1318-93-0?focus=products&page=1&perpage=30&sort=relevance&term=1318-93-0&type=product
      The CAS number for sodium bentonite is 85049-30-5. This material is currently not available for purchase.

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  6. What is the particle size for the product 285234?

    1 answer

    1. The particle size is not tested for every lot of this product. However, data from one particular lot showed that 100% of the particles were smaller than 74 micrometers, and 99.75% were smaller than 44 micrometers, with a mean particle size of 5.45 micrometers.

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  7. what is the average particle size?

    1 answer

    1. The particle size of this product is not tested on a lot-to-lot basis. However, historical data indicates a size of <74 um with the majority being <44 um.

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