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以高炉渣和壳聚糖为原料,制备了高温改性高炉渣-壳聚糖复合吸附剂(TBFSC)和盐酸改性高炉渣-壳聚糖复合吸附剂(ABFSC),考察了2种吸附剂对酸性蒽醌蓝和活性艳红K-2BP的吸附性能,研究了吸附过程的等温吸附特征、吸附动力学和热力学。结果表明,2种染料在TBFSC和ABFSC上的吸附更好地符合Langmuir等温方程,表观二级动力学模型能够很好地描述TBFSC和ABFSC的吸附动力学行为。对于染料在TBFSC上的吸附,粒子内扩散过程和液膜扩散过程是该吸附的速控步骤,而液膜扩散过程为ABFSC吸附染料的速控步骤。热力学参数表明,TBFSC和ABFSC对两种染料的吸附都是自发进行的物理吸附,吸附过程均无配位基交换、化学键等强的作用力。
High temperature modified blast furnace slag-chitosan composite adsorbent (TBFSC) and hydrochloric acid modified blast furnace slag-chitosan composite adsorbent (ABFSC) were prepared from blast furnace slag and chitosan. Two kinds of adsorbents The adsorption properties of acid anthraquinone blue and reactive brilliant red K-2BP were studied. The isothermal adsorption characteristics, adsorption kinetics and thermodynamics were studied. The results show that the adsorption of two dyes on TBFSC and ABFSC conforms better to the Langmuir isothermal equation. The apparent second-order kinetic model can well describe the adsorption kinetics of TBFSC and ABFSC. For the adsorption of dye on TBFSC, the intra-particle diffusion process and liquid-membrane diffusion process are the speed-control steps of the adsorption, while the liquid-film diffusion process is the speed-control step of ABFSC adsorption dye. The thermodynamic parameters showed that the adsorption of TBFSC and ABFSC on both dyes were spontaneous physical adsorption, and none of the adsorption processes such as ligand exchange and chemical bond were strong.