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Decolorization of Rice Bran Oil: Adsorption of Pigments on Acid-Activated Kaolin
http://hdl.handle.net/20.500.12678/0000007831
http://hdl.handle.net/20.500.12678/000000783125898d13-2657-4663-8d6f-c06962218190
78f43809-bba7-4777-91b3-6a7c5a159856
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Journal article | ||||||
Upload type | ||||||
Publication | ||||||
Title | ||||||
Title | Decolorization of Rice Bran Oil: Adsorption of Pigments on Acid-Activated Kaolin | |||||
Language | en | |||||
Publication date | 2014-01-01 | |||||
Authors | ||||||
Lei Lei Aung | ||||||
Paitip Thiravetyan | ||||||
Description | ||||||
Kaolin obtained from Ranong, Thailand, which mainly consists of kaolinite (1:1 type luminosilicate clay: one silica tetrahedral sheet is combined with one alumina octahedral sheet), was ground and then followed by oxalic acid activation using different clay/acid ratio, to optimize its bleaching of rice bran oil as a reference of commercial bleaching clay. The physico-chemical properties of natural and activated kaolins are determined by XRD, XRF and BET techniques and the bleaching capacities of those kaolins are measured by a pectrophotometer. The optimum bleaching capacity (- 79%) was achieved by using 0.1 M oxalic acid with clay/acid ratio of 1:80, in which the value was slightly inferior to that of commercial bleaching clay (-84%). Acid activation upon ground kaolin increased in surface area and mesopore content accompanied by a decrease in the alumina to silica ratio, leading to the enrichment of the silica phase in the tetrahedral sheet. It also increased in the proportion of mesopores in -40 A which is the proposed suitable range for the pigment molecules in the oil adsorbed onto the clay. DRIFT technique shows that the chlorophyll-a molecules from the oil was chemically adsorbed on activated kaolins which wasch emisorption. | ||||||
Keywords | ||||||
kaolin, kaolinite, commercial bleaching clay, rice bran oil, chlorophyll-a, chemisorptions | ||||||
Journal articles | ||||||
Universities Research Journal | ||||||
327-338 | ||||||
Vol. 7, No.1 |