以拟薄水铝石为铝源、钛酸四丁酯为钛源、聚氧乙烯聚氧丙烯醚为模板剂、四氢呋喃为溶剂,采用蒸发溶剂诱导自组装法于600℃退火制备了介孔复合材料γ-Al₂O₃@TiO₂。以酸性嫩黄G(AYG)为模拟污染物,研究了复合材料对AYG的吸附性能。X射线衍射仪、全自动物理吸附仪、场发射扫描电子显微镜、透射电子显微镜表征证实γ-Al₂O₃@TiO₂复合材料具有介孔球状核壳结构、锐钛矿相和γ-Al₂O₃尖晶石相。采用单因素实验确定温度298K、pH=2、吸附剂用量为0.1g/L、吸附时间180min条件下,最大吸附量为306.75mg/g,远高于大部分作用相同的吸附材料。复合材料经离心分离于600℃退火3h后重复利用5次,吸附率未见明显降低,循环利用性优异。复合材料对AYG的吸附行为符合Freundlich等温吸附模型(R²≥0.99),表明材料表面存在多种吸附位点,吸附过程为多分子层吸附。吸附动力学研究表明AYG的脱色过程遵循内扩散模型。

In this study,using pseudo-boehmite as the aluminum source,tetrabutyl titanate as the titanium source,polyoxyethylene polyoxypropylene ether as the template agent,and tetrahydrofuran as the solvent,a mesoporous γ-Al₂O₃@TiO₂ composite was synthesized through a solvent evaporation induced self-assembly (SEISA) method followed by annealing at 600℃.Using acidic yellow G (AYG) as a simulated pollutant,the adsorption performance of the composite material toward AYG was investigated.Characterization techniques such as XRD,BET,SEM,and TEM confirmed that the γ-Al₂O₃@TiO₂ composite possessed a mesoporous spherical core-shell structure,exhibiting both anatase titanium dioxide phase and γ-Al₂O₃ spinel phase.Single-factor experiments determined optimal conditions of 298K,pH=2,and adsorbent dosage of 0.1g/L,resulting in a maximum adsorption capacity of 306.75mg/g,significantly higher than most comparable materials.After centrifugation and annealing at 600℃ for 3 hours,the adsorbent retained its adsorption efficiency over five reuse cycles,demonstrating excellent reusability.The adsorption isotherm closely matched the Freundlich model (R²≥0.996),indicating multiple adsorption sites on the material surface and a multilayer adsorption process.Kinetic studies revealed that the decolorization process of AYG followed an intra-particle diffusion model.