多孔黏土异构材料对气态萘的吸附

Adsorption of gaseous naphthalene on porous clay heterostructures

以膨润土为基质,添加表面活性剂和助表面活性剂,制备了多孔黏土异构材料(PCHs),采用SEM和BET技术进行了表征,并将其用于气态萘的吸附。考察了吸附效果的影响因素,并探讨了吸附机理。表征结果显示,PCHs具有较大的比表面积,孔径分布均匀,兼具微孔和中孔结构。实验结果表明:当吸附温度为30℃、初始萘质量浓度为560 mg/m3、相对湿度为0时,PCHs对萘的平衡吸附量达370 mg/g,远高于膨润土和有机膨润土;吸附为放热过程,温度越高平衡吸附量越低;平衡吸附量随初始萘质量浓度的增加呈非线性增长;水蒸气的存在导致萘的平衡吸附量减小;萘在PCHs上的吸附机理主要为表面物理吸附和有机质的分配作用。

The porous clay heterostructures （PCHs） were synthesized from bentonites with different surfactants and cosurfactants, characterized by SEM and BET, and used for adsorption of naphthalene. The factors affecting adsorption were investigated, and the adsorption mechanism was discussed. The characterization results show that PCHs possesses larger specific surface area and micropore and mesopore structures with uniform pore distribution. The experimental results show that： When the adsorption temperature is 30 ℃, the initial naphthalene mass concentration is 560 mg/ m3 and the relative humidity is 0, the equilibrium adsorption capacity of naphthalene on PCHs is 370 mg/g, far higher than those on original and organic bentonites; The adsorption process is an exothermic reaction, and the higher the temperature is, the lower the equilibrium adsorption capacity is; The equilibrium adsorption capacity is non-linearized increased with the increase of initial naphthalene mass concentration; The presence of water vapor can reduce the equilibrium adsorption capacity of naphthalene; The physical surface adsorption and the partition of organics are the predominant mechanisms of naphthalene adsorption on PCHs.