稀土元素对Cu^+-13X分子筛吸附2,5-二甲基噻吩和苯并噻吩的影响

Effect of Rare-Earth Element on Adsorption of 2,5-Dimethylthiophene and Benzothiophene on Cu^+-13X Molecular Sieves

采用离子交换法制备了Cu^+-13X及负载稀土元素Ce的Cu^+-13X分子筛(Ce/Cu^+-13X)吸附剂,分别从静态吸附平衡及动力学测试两方面考察了两种吸附剂对2,5-二甲基噻吩和苯并噻吩的吸附性能;分别采用Langmuir模型和修正的Langmuir模型对单、双组分静态吸附平衡数据进行拟合,采用Crank单孔扩散模型对动力学数据进行拟合。拟合结果表明,数据与模型吻合均很好。计算得到了Ce/Cu^+-13X吸附剂对2,5-二甲基噻吩和苯并噻吩单组分的最大吸附量分别为165.1,193.0 mg/g,分别大于Cu^+-13X吸附剂对2,5-二甲基噻吩和苯并噻吩的最大吸附量(153.6,180.2 mg/g)。负载稀土元素对Cu^+-13X吸附剂的吸附性能有一定的促进作用,能够减弱2,5-二甲基噻吩和苯并噻吩之间的竞争吸附。

Adsorbents of Cu^＋-13X molecular sieves and Cu^＋-13X with rare-earth Ce（Ce/Cu^ ＋ -13X） were prepared by ion-exchange method. Their adsorption performances for 2,5-dimethylthiophene and benzothiophene were investigated through static adsorption equilibrium and kinetics test. Langmuir model and modified Langmuir model were separately used to fit the static equilibrium data of the single/binary adsorption systems. The kinetics data was fitted well by Crank diffusion model. The maximum adsorptive capacities of Cu^＋--13X for 2,5-dimethylthiophene and benzothiophene were 165.1 and 193.0 mg/g, respectively, which were more than 153.6 and 180. 2 mg/g of Cu^＋-13X, respectively. The results indicated that rare-earth element Ce could improve the Cu^＋-13X adsorption performance and weaken the competitive adsorption between the two components.