Preparation And Properties Of Silicon Magnesium Adsorption Material

In this paper, on the basis of previous work in the laboratory,11new typemagnesium silica gels were synthetized by using sodium silicate and magnesiumchloride through Sol-gel method and hydrothermal method. Magnesium silica gelswere characterized by analytical methods of scanning electron microscopy analysis,fourier transform infrared spectroscopy analysis, hermogravimetry and differentialscanning calorimetry analysis and X-ray powder diffraction analysis. The adsorptionperformance of Magnesium silica gel adsorbed methylene blue and weak acid red wasstuyed. The adsorption time, adsorbent additive amount, initial solution pH value,temperature, the effect of initial concentration, the adsorption isotherm and kineticsequation were stuyed on adsorption performance.Magnesium silica gel that synthetized through Sol-gel and hydrothermal arewhite functional particles, dispersion and chemical stability is good, active group isalso rich in surface, nitrogen adsorption stripping curve has obvious hysteresis loop,prone to capillary condensation phenomenon. The specific surface of magnesiumsilica gel by Sol-gel method is between120.22~330.39m2·g-1, the hydrothermalpreparation specific surface is560.40m2·g-1, with the temperature110℃andhydrothermal12h the magnesium silica gel has the largest specific surface.Roasting temperature has an important influence of specific surface and porestructure.Through the experiment of eight kinds of sol-gel method sythtized magnesiumsilica gel adsorbed methylene blue and weak acid red, the results showed that1:5magnesium silica gel had the best adsorption effect of methylene blue, the adsorptionquantity is80mg·g-1.3:1magnesium silica gel had the best adsorption effect of weakacid red best, the adsorption quantity is200mg·g-1. Langmuir adsorption model candescribe the adsorption well, the adsorption is monolayer adsorption; Pseudo secondary dynamics equation can effectively describe the adsorption behavior, theadsorption equilibrium in was arrived in a very short period of time.Through high temperature roasting, sepiolite, attapulgite, and commoditymagnesium silica gel were modified. By measuring the organic acid adsorption ofsepiolite, attapulgite and commodity, found that isotherm included S, C, H and L type,the Freundlich adsorption isothermal model can better describe the adsorption processof series of organic acid of attapulgite, sepiolite and magnesium silica gel, magnesiumsilica gel series materials have good adsorption treatment effect on organic acid.On this basis, study the adsorption with11new type magnesium silica gel and3goods silicon magnesium adsorption materials of organic acids in biological diesel oil,research adsorption time, adsorbent dosing quantity and other conditions on theinfluence of adsorption performance, found that the9:1hydrothermal preparation ofmagnesium silica gel has the best adsorption, the optimum adsorption conditions is:the calcination temperature is450℃, roasting time is4h, adsorption time is6h,adsorbent additive quality is0.50g·L-1, adsorption temperature is25℃, themaximum adsorption quantity of magnesium silica gel can be up to980mg·g-1, theisothermal adsorption process accords with the Freundlich adsorption isotherm well.Through the above experiment process, as a new adsorbent, magnesium silica gelhas good treatment effect on the adsorption of printing and dyeing wastewater,organic acids and refining process of biodiesel, is a widely used, high efficiency andlow cost product.