Research On Preparation Process Of Magnesium Silicate Gel

The magnesium silicate gel, it contains rich water with unique layer structure andthe powerful adsorptive capacity. This paper carried out a systematic study, whichfocused on the synthesis of magnesium silicate gel, its application in dye adsorption,with major work and achieved important results as follows:Several series magnesium silicate gel samples were prepared by differentmethods–hydrothermal reaction of magnesium chloride and sodium metasilicate,solution reaction of magnesium chloride and sodium metasilicate at differenttemperature. The product was characterized by means of X-ray diffraction (XRD),infrared spectrum (IR), scanning electron microscope (SEM), and BET method. Itscomponents content was also studied by chemical analysis method.SEM results showed that morphology of magnesium silicate gel depends on thecomposition, synthesis method and temperature. There exist several kinds ofmagnesium silicate gel in its surface, such anomalous group bunch of pellet, thinlaminated shape.1:1magnesium silicate ratio magnesium silicate gel sample hadanomalous group bunch of pellet structure,1:3ratio magnesium silicate gel samplehad thin laminated shape and anomalous group bunch of pellet structure either.Magnesium silicate gel samples had used as adsorbents to remove the color ofmethylene blue solution, mixed dyes consisted of methylene and malachite green. Theadsorbents had good performance to dyes, the adsorption of dyes on magnesiumsilicate gel samples were more fitted to Langmuir isotherm equation. The adsorptionwas proved to be an endothermal process, and the increase of temperature benefit tothe adsorption. The adsorption of magnesium silicate gel process was fitted well topseudo-second kinetic models.