NGHIÊN CỨU ĐỘNG HỌC, NHIỆT ĐỘNG HỌC VÀ ĐẲNG NHIỆT QUÁ TRÌNH HẤP PHỤ RHODAMINE B LÊN VẬT LIỆU CuZIF-11

Tóm tắt

The adsorption behavior of rhodamine B (RhB) on a material ZIF-11 modified with Cu²⁺ ions (CuZIF-11)
was studied. The results showed that CuZIF-11 exhibited excellent adsorption capacity toward RhB. The
adsorption data fit well to the Langmuir isotherm model, with a maximum adsorption capacity of 138.89
mg/g at 313 K. The adsorption kinetics followed the pseudo-second-order model and were also consistent
with the intraparticle diffusion model. Thermodynamic parameters indicated that the adsorption process was
endothermic. The activation energy of adsorption (Ea) was determined to be 10.46 kcal/mol. This relatively
high Ea suggested that the adsorption of RhB onto CuZIF-11 was likely a chemical adsorption process. The
adsorption mechanism was attributed to electrostatic attraction and π–π stacking interactions between RhB
and the CuZIF-11 adsorbent.