Effect of alumina content and surface area of acid-activated kaolin on bleaching of rice bran oil

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dc.contributor.authorLei Lei Aung
dc.contributor.authorEmmanuel Tertre
dc.contributor.authorParinda Suksabye
dc.contributor.authorNiramon Worasith
dc.contributor.authorPaitip Thiravetyan
dc.date.accessioned2025-03-10T07:36:30Z
dc.date.available2025-03-10T07:36:30Z
dc.date.issued2015
dc.description.abstractThis study investigated the effect of kaolin acid activation on alumina losses, surface area changes and oil bleaching performance. Ground kaolin was treated with hydrochloric or citric acid, and bleaching tests were performed on rice bran oil. The adsorption studies showed that the optimal bleaching of ~83 or ~81 % were achieved by activation with 0.5 M hydrochloric or citric acid, respectively, whereas bleaching with a commercial clay was ~82 %. The highest bleaching value was not associated with the maximum clay surface area or porosity. X-ray fluorescence showed that alumina contents of 31-34 % were suggestive for optimum bleaching depending on the different acid used. Treating ground kaolin with the same hydrochloric acid strength by varying the acid concentration and clay/acid ratio also confirmed that the best Al3+ content was ~32 %, and a value lower than one indicated the extensively destruction of kaolinite proportions leading to a decrease in its bleaching capacity, even though it had the maximum surface area. The decrease in capacity was due to the reduction of alumina content, and the parallel formation of high amorphous silica was favorable for the adsorption of anionic pigments, such as chlorophyll-a. � 2014 AOCS.
dc.identifier.citationJAOCS, Journal of the American Oil Chemists' Society
dc.identifier.doi10.1007/s11746-014-2583-2
dc.identifier.issn0003021X
dc.identifier.scopus2-s2.0-84925533997
dc.identifier.urihttps://repository.dusit.ac.th//handle/123456789/4848
dc.languageEnglish
dc.publisherSpringer Verlag
dc.rights.holderScopus
dc.subjectAlumina to silica ratio
dc.subjectBleaching
dc.subjectKaolin
dc.subjectKaolinite proportions
dc.subjectRice bran oil
dc.subjectXRF analysis
dc.titleEffect of alumina content and surface area of acid-activated kaolin on bleaching of rice bran oil
dc.typeArticle
mods.location.urlhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84925533997&doi=10.1007%2fs11746-014-2583-2&partnerID=40&md5=98e8495c3a180a0f18a76f3c546c9969
oaire.citation.endPage304
oaire.citation.issue2
oaire.citation.startPage295
oaire.citation.volume92
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