Acid-activation assisted by microwave of a Brazilian bentonite and its activity in the bleaching of soybean oil
Source abstract
Abstract
Abstract In this work, a bentonite clay from Brazil was activated with H 2 SO 4 (6 N) by microwave operating at different powers for 15 min. Physical and structural changes on the clay were observed after the microwave treatment. These changes were measured by X-ray diffraction (XRD), specific surface area (SSA) and atomic force microscopy (AFM) techniques. The bleaching capacity of each sample for the alkali-refined soybean oil was determined. It was observed that the average pore size of clay particles showed some contribution on the oil bleaching capacity, and that is not associated with maximum SSA. A mechanism of soybean oil bleaching by β-carotene molecule adsorption into particle pore of bentonite was proposed.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Clay minerals and soil interactions · Iron oxide chemistry and applications · Adsorption and biosorption for pollutant removal
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (28)
Show source-provided references
1. Edible oil bleaching with a bentonite activated by micro wave irradiation10.1016/S0151-9107(02)80020-4 ↗
2. Acid activation and bleaching capacity of bentonites from the islands of Milos and Chios, Aegean, Greece10.1016/S0169-1317(97)00017-3 ↗
3. Studies on the characterization of several iridium- and rhodium-clay catalysis and their activity in imines hydrogenation10.1006/jcat.2001.3221 ↗
4. Desorption of ethyl acetate from modified clays by supercritical carbon dioxide
5. Studies on the acid activation of Brazilian smectitic clays
6. Colza oil bleaching through optimized acid activation of bentonite. A comparative study10.1016/j.clay.2008.03.014 ↗
7. Gas-phase β-pinene isomerization over acid-activated bentonite
8. Performance of an Argentinian acid-activated bentonite in the bleaching of soybean oil10.1590/S0104-66322003000200007 ↗
9. Clarification of cottonseed oil: how structural properties of treated bentonites by acid affect bleaching efficiency
10. Sunflower oil bleaching by adsorption onto acid-activated bentonite10.1590/S0104-66322011000100018 ↗
11. Bentonites modified with anionic and cationic surfactants for bleaching of crude palm oil10.1016/j.clay.2009.11.037 ↗
12. Beneficiation and applications of an Egyptian bentonite10.1016/S0169-1317(98)00021-0 ↗
13. Bleaching performance of a nigerian (Yola) bentonite
14. Characterization of smectite after acid activation with microwave irradiation10.1016/j.clay.2008.04.014 ↗
15. The effect of microwave irradiation and conventional acid activation on the textural properties of smectite: comparative study10.1016/j.clay.2012.01.020 ↗
16. Chlorophyll adsorption by alumina pillared acid-activated clay10.1007/BF02545302 ↗
17. Moore · 1997
18. Alteration of cameroonian clays under acid treatment. Comparison with industrial adsorbents10.1016/j.clay.2011.02.009 ↗
19. Antibacterial activity of poloxamer-modified montmorillonite clay against E. coli10.1016/j.matlet.2011.06.077 ↗
20. The effect of sulphuric acid activation on the crystallinity, surface area, porosity, surface acidity, and bleaching power of a bentonite10.1016/j.foodchem.2007.03.060 ↗
21. Soy oil lutein adsorption by rice hull ash10.1007/BF02636188 ↗
22. The role of bleaching clays and synthetic silica in palm oil physical refining10.1016/S0308-8146(02)00551-4 ↗
23. Decolorization of vegetable oils: adsorption mechanism of β-carotene on acid-activated sepiolite10.1016/j.foodchem.2005.12.052 ↗
24. Surface properties of an activated bentonite — decolorisation of rape-seed oils10.1016/0169-1317(89)90019-7 ↗
25. Acid-activated clays
26. Preparation of pure hectorite using microwaves10.1016/j.phpro.2010.10.017 ↗
27. Characterization, acid activation and bleaching performance of bentonite from Xinjiang10.1016/S1004-9541(06)60067-0 ↗
28. Modification of layer charge in smectites by microwaves10.1016/j.clay.2006.01.002 ↗