Acid-activated bentonite (Maghnite-H+) as a novel catalyst for the polymerization of decamethylcyclopentasiloxane DJAMAL EDDINE KHERROUB 1,2 ∗, MOHAMMED BELBACHIR, SAAD LAMOURI3 and KARIM CHIKH1 1Laboratory of Polymer Chemistry, Department of Chemistry, Faculty of Exact and Applied Sciences, University of
Apr 14, 2020· Graphene oxide-calcium alginate composite has an absorptive capacity 20 times greater than acid-activated bentonite clay (Fatihaa and Belkacem 2016; Li et al. 2013). In this work, a novel technique was presented for conversion of bentonite clay into high adsorption capacity absorbent. The bentonite clay was used as a substrate for deposition of ...
Preparation of activated bentonite and its adsorption behavior on oil-soluble green pigment 833 sulfuric acid (H 2 SO 4) dosage, microwave power, liquid-to-solid ratio and activation time. Figure 3 shows the effect of operation factors on the activity degree and decolorization ratio of activated bentonite (AB).
Keywords: clay, acid-activated bentonite, bleaching, soybean oil. INTRODUCTION. Due to its sorptive and catalytic properties, bentonite is widely used in a variety of industrial applications. The clay is utilized as a pesticide carrier, an animal waste adsorbent, a catalyst and catalyst support, and a decolorizing agent in oil refining, and in ...
Acid-activated bentonites are high-added-value specialty clays and so are organophilic bentonites, which are prepared by replacement of the exchangeable cations by suitable organic cations. Organophilic bentonites are hydrophobic and are used for the preparation of CPN, with enhanced properties ( Bergaya and Lagaly, 2007, Bergaya et al., 2011 ).
Acid-activated clays are produced almost exclusively from southern or nonswelling bentonites by treatment with various mineral acids. When used for their ability to decolorize or "bleach" color pigments from vegetable and petroleum oils, they are called bleaching clays or bleaching earths. Although sometimes confused with fuller's earths, which are also sometimes called bleaching clays ...
Keywords:Bentonite, hydroamination, p-toluenesulfonamide, cyclohexene, aniline. Abstract:Hydrochloric acid activated bentonite was used as a catalyst for hydroamination of cyclohexene with p-toluenesulfonamide under atmospheric pressure. The structure and surface acid property of the catalyst were studied by XRD and NH3-TPD.
The acid activated bentonite within the receiver layer reacts as a colour developer to a coloured final stage. Even small quantities of coating-bentonites provide a good coverage of paper surface. In coating formulations binder content can be reduced and the production of paper qualities for various methods is possible.
discussed in terms of loss in both porosity and acid strength. KEY-WORDS: Acid activation – Bentonite – Design of experiments – Oil bleaching. 1. INTRODUCTION Acid-activated clays are the most common bleaching agents for vegetal oils. Among them, activated bentonites are regarded in bleaching industries as references for removing chlorophyll,
3.1.4. Determination of BET Surface Area. The surface area of bentonite shows a significant increase with activation by acid. Measured values are 66.2 and 287.8 m 2 g −1 for raw and activated bentonite, respectively. Since this increase is a result of removing impurities, replacement of exchangeable cations, such as K +, Na +, and Ca 2+, with H + ions, and leaching out A1 3+, Fe 3+, and Mg 2 ...
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