Abstract
Three metal-organic frameworks (MOFs), namely [La(L)Cl(H2O)2]n (1), {[Nd(L)Cl(H2O)3]•2H2O}n (2) and {[Pr2(L)2Cl2(H2O)6]•H2O}n (3), were successfully structured based on ligand 5-((6H-purin-6-yl)amino)isophthalic acid (H2L). X-ray single-crystal diffraction analysis showed that MOFs 1–3 possessed the similar two-dimensional (2D) planar structure. Adsorption experiments showed that MOFs 1–3 exhibited good adsorption effect on Congo red (CR), and their maximum adsorption capacities were 1428, 433 and 319 mg·g−1, respectively. The adsorption kinetics and isotherms showed that the adsorption process conformed to the quasi-second-order kinetic model and the Langmuir model, respectively. The adsorption process belonged to chemical adsorption and monolayer adsorption. The adsorption mechanism mainly involves hydrogen bonding, π-π stacking interaction and electrostatic interaction. In addition, the magnetic test results showed that MOFs 2 and 3 have typically antiferromagnetic behavior.
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