Xavier K.C.M.,Interdisciplinary Laboratory of Advanced Materials |
Santos M.S.F.,Interdisciplinary Laboratory of Advanced Materials |
Osajima J.A.,Interdisciplinary Laboratory of Advanced Materials |
Luz A.B.,Mineral Technology Center |
And 2 more authors.
Applied Clay Science | Year: 2016
Palygorskite, a fibrous clay mineral, exhibits excellent adsorbent properties. This study was conducted to assess the potential activation of palygorskite and to obtain thermally activated samples to use as clarifying agents for soybean oil. Previously, the palygorskite samples were thermally activated at various temperatures in the range of 100-900. °C for 24. h. The natural and activated samples were characterized using the following techniques, XRD, XRF, FTIR, SEM, SSA, CEC and thermal analysis, to observe the structural and morphologic alterations after thermal treatment. These characterizations indicated that the primary changes to the palygorskite surface referred to losses of structural water: physically adsorbed, zeolitic and coordination water molecules. The sample was activated above 700. °C, which potentiated the clarification of the soybean oil by the removal of the carotenoid dye and other pigments, and exhibited higher performance compared with the natural palygorskite. © 2015 Elsevier B.V.