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Synthesis and Sorption Properties of the Porous Magnesian/Silics Materials

Author: ZhaoYouXing
Tutor: WangHaiZeng
School: Ocean University of China
Course: Marine Chemical Engineering and Technology
Keywords: Magnesium chloride Silicone Magnesium, silicon porous material Adsorption Air dehumidification
CLC: TB332
Type: Master's thesis
Year: 2011
Downloads: 92
Quote: 1
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Abstract


In this thesis, magnesium (MgCl 2 · 6H 2 O) and commodity silica as raw materials, preparation of two series of magnesium, silicon porous composite adsorption material: magnesium chloride / silica gel drying agents and magnesium oxide / silica adsorbent material. And using the specific surface area and pore size analysis, X-ray diffraction analysis, scanning electron microscopy, infrared spectroscopy and differential thermal - thermal analysis and other modern means of analysis of the prepared composite porous magnesium, silicon materials were characterized. The effects of magnesium chloride / silica gel desiccant dehumidification of the air, of magnesium oxide / silica adsorption material for water pollutants (methylene blue, basic violet and Ni 2 ) adsorption performance. Prepared by impregnation of magnesium chloride modified silica gel desiccant, 60 ℃ drying to remove a surface impregnation compound adsorbed water; 130 ℃ two drying 5 h, the partial removal of water of crystallization of magnesium chloride to give hygroscopic magnesium chloride / silica composite desiccant. Modified silica specific surface area of ??124.41 m2 · g -1 , a pore diameter of 14.64 nm; in the humidity absorption capacity of the composite desiccant is silica gel 10 15 times , which is due to the magnesium chloride filling the pores of silica, with a large specific surface area and silica porous, based on fully hydrated magnesium chloride of low hygroscopicity. Prepared two kinds of magnesium oxide modified silica gel (CKGS and ZCGS); influencing factors on the preparation process of research to determine the optimum conditions for preparation of two adsorbents. CKGS optimum preparation conditions were: concentration of impregnating solution of magnesium chloride 2mol · L -1 , reaction pH of 5.84, immersion time is 2 h, calcination temperature 500 ℃, calcination time 5 h. ZCGS optimum preparation conditions were: concentration of impregnating solution of magnesium chloride 2mol · L -1 , reaction pH of 5.23,25 ℃ temperature oscillation 2 h, 400 ℃ calcined 5 h. Characterized by the adsorbent, the results showed that the two adsorbents total pore volume and specific surface area ratio was reduced by modification; modified silica adsorbent retains the original IR peaks; According to XRD results, the modified after the characteristic peaks of magnesium oxide; the TG-DSC analysis shows that after the modified two adsorbents have better thermal stability. Magnesia modified silica gel using two methylene blue for water and basic violet for removal was investigated adsorption time, temperature, adsorbent dosage, initial concentration, pH and other test conditions on the adsorption properties. Experimental results show that: Two magnesium porous materials have a strong dye in water removal capability. Adsorbent in the adsorption of the dye monolayer adsorption-based, the Langmuir isotherm equation; elevated adsorption temperature, composite adsorbent adsorption capacity q ∞ increases, Langmuir isotherm equation constants KL also increases, the temperature can be seen elevated favor adsorption. Adsorbents for dye adsorption process, the pseudo-second-order kinetic reaction can be more real and alkaline methylene blue violet in both adsorbent adsorption mechanism, the use of pseudo-second-order kinetic equation to calculate the equilibrium adsorption capacity qe (cal ) obtained by the experimental determination of adsorption capacity qe (exp) similar. Two kinds of MgO / silica composite materials on the water Ni 2 adsorption studies show: composite adsorbent for Ni 2 adsorption capacity, removal rate. Two adsorbents for Ni 2 adsorption is affected by the temperature, the adsorption rate increases as the temperature increases, the removal rate decreased, indicating that the adsorption of metal ions is exothermic. The Langmuir model describes Ni 2 ions in CKGS and ZCGS surface adsorption isotherm behavior, Ni 2 In both magnesium oxide modified silica gel adsorption followed pseudo-second-order kinetics equation. The Institute prepared a new magnesium porous materials have good water vapor dehumidification effect on water pollutants (methylene blue, basic violet and Ni 2 ) has excellent adsorption performance. Magnesium composite porous silica material preparation, both for the brine resources development and utilization of magnesium provides a new idea, but also applies to water pollution control, so it has broad application prospects.

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