Abstract
Modification of the Thermally Exfoliated Vermiculite by Sonication and Grafting Methods
Highlights
IntroductionVermiculite is a layered phyllosilicate (type 2:1 or TOT), its sheet is an octahedral layer (type of Mg, Al, and Fe) sandwiched between two tetrahedral layers (type of Si and Al )
Vermiculite is a layered phyllosilicate, its sheet is an octahedral layer sandwiched between two tetrahedral layers
We have studied the effect of ultrasound on the thermally exfoliated vermiculite in order to grafting with butyl imidazolium
Summary
Vermiculite is a layered phyllosilicate (type 2:1 or TOT), its sheet is an octahedral layer (type of Mg, Al, and Fe) sandwiched between two tetrahedral layers (type of Si and Al ). Increasing the surface area of the vermiculite improves its adsorption capacity This improvement will be enhanced by decreasing the grains size by simple milling [6] or by sonication [19,20,21,22,23,24,25,26]. A finer grains size and higher surface area were obtained by "vibration milling, this technique can leaded to the destruction of the vermiculite structure [28]. Fernández et al grafted vermiculite by silane group [31] This technique gives the best results when the limit to the modification by milling or sonication is achieved. To increase the yield of grafting, it is essential to reduce the size grains of vermiculite and increase the number of -OH groups at the edges of the sheets. We grafted the smaller particles of vermiculite with butyl imidazolium to so as increase their capacity for adsorption of heavy metals
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