论文部分内容阅读
以硝酸铝和碳酸氢铵为原料,采用溶胶-凝胶法合成具有较高活性的介孔γ-Al2O3纳米材料。对合成的样品进行XRD、TEM和BET表征。结果表明:在N2气氛下煅烧所得样品与在空气中煅烧所得样品相比,其比表面积略有增加;在溶胶-凝胶过程中,用乙醇洗涤凝胶能显著提高产物的比表面积,所得产物比表面积高达390 m2/g,呈多孔结构,孔径尺寸约为2-4 nm;未经乙醇处理的样品比表面积仅为247 m2/g。选取比表面积为390 m2/g的介孔γ-Al2O3样品进行水中F-的吸附研究,通过研究样品的吸附量与吸附时间、溶液的pH值和溶液中F-浓度之间的关系,得出最佳吸附条件,并推导出等温吸附方程。
Mesoporous γ-Al2O3 nanomaterials with high activity were synthesized by sol-gel method using aluminum nitrate and ammonium bicarbonate as raw materials. The synthesized samples were characterized by XRD, TEM and BET. The results showed that the specific surface area of the sample calcined in N2 was slightly higher than that of the sample calcined in air. In the sol-gel process, the gel was washed with ethanol to increase the specific surface area of the product. The product The specific surface area is up to 390 m2 / g, which is porous and the pore size is about 2-4 nm. The specific surface area of the sample without ethanol is only 247 m2 / g. The mesoporous γ-Al2O3 sample with the specific surface area of 390 m2 / g was selected to study the F- adsorption in water. The relationship between the adsorption amount, the adsorption time, the pH value of the solution and the F- concentration in the solution was obtained The best adsorption conditions, and derived isothermal adsorption equation.