College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, P. R. China.
Inner Mongolia Vocational College of Chemical Engineering, Hohhot, 010070, P. R. China.
ChemistryOpen. 2023 Feb;12(2):e202200176. doi: 10.1002/open.202200176.
Three crystal complexes were designed and synthesised through the solvothermal method, with Cu , Zn , and Cd ions as the metal centres and 2,4,6-tri(2-pyridyl)-s-triazine (TPTZ) and terephthalate (BDC ) as the ligands. Their compositions were determined to be Cd(TPTZ)Cl (Cd-MOF), {[Zn(TPTZ)(BDC)] ⋅ 3H O} (Zn-MOF), and Cu (PCA) (BDC)(H O) (Cu-MOF) (PCA =2-pyridinium amide), respectively. Cd-MOF can adsorb 90 % of Congo red (CR) in 10 s at room temperature and atmospheric pressure, and CR removal was complete at 20 s over a wide pH range. The adsorption capacity for CR reached 1440 mg g in 5 min. Selective adsorption was demonstrated in mixed dyes. The adsorption kinetic data agree well with the pseudo-second-order kinetic model. The Temkin model was successfully used to evaluate the adsorption isotherms of CR on Cd-MOF at room temperature, suggesting that adsorption occurs through a hybrid of monolayer and multilayer mechanisms.
通过溶剂热法设计并合成了三种晶体配合物，以 Cu、Zn 和 Cd 离子作为金属中心，2,4,6-三（2-吡啶基）-均三嗪（TPTZ）和对苯二甲酸（BDC）作为配体。它们的组成分别确定为 Cd(TPTZ)Cl（Cd-MOF）、{[Zn(TPTZ)(BDC)]·3H₂O}（Zn-MOF）和 Cu（PCA）（BDC）（H₂O）（Cu-MOF）（PCA=2-吡啶酰胺）。Cd-MOF 在室温常压下 10 s 内即可吸附 90%的刚果红（CR），在较宽的 pH 值范围内 20 s 内即可完成 CR 的去除。在 5 min 内，CR 的吸附容量达到 1440 mg·g。在混合染料中表现出选择性吸附。吸附动力学数据与准二级动力学模型吻合较好。Temkin 模型成功地用于评估室温下 CR 在 Cd-MOF 上的吸附等温线，表明吸附是通过单层和多层机制的混合发生的。
