Regulating defected zirconium metal–organic frameworks in ionic liquid for sewage treatment

• Published in: Journal of molecular structure Vol. 1286; p. 135607
• Main Authors: Duan, Jun-Jie, Xin, Xin, Guo, Shi-Jie, Wang, Shuang-Long, Chen, Hao, Li, Jun-Ling, Qin, Song, Tao, Guo-Hong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.08.2023
• Subjects: Ionic liquid; Ionothermal synthesis; Metal–organic frameworks; Rhodamine B; Sewage treatment; UiO-66; UiO-66; Rhodamine B; Ionothermal synthesis; Metal–organic frameworks; Sewage treatment; Ionic liquid
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2023.135607

•Synthesis of defective UiO-66 by using ionic liquid [EMIM]OAc.•High missing-linker defects enable UiO-66 to have more active sites than conventional DMF composites.•Efficient adsorption of RhB in sewage with defective UiO-66.•Defective UiO-66 derivatives with different ligand substitution (-NH2) can be synthesized by [EMIM]OAc. Regulation of defected metal–organic frameworks (MOFs) is a promising strategy to improve their performances. Ionothermal synthesis method provides extra opportunities to overcome the confinement of traditional DMF-based solvent-thermal syntheses. In this study, ionic liquid 1-ethyl-3-methylimidazolium acetate [EMIM]OAc was employed to synthesize UiO-66 and UiO-66-NH2 by ionothermal synthesis. Characterization results indicate that UiO-66 synthesized in ionic liquid exhibits high miss linker defects at modulator-free conditions. The properties of obtained UiO-66, such as particle sizes, specific surface area, and pore size, were greatly correlated with the usage of acetic acid modulator. The particle sizes of UiO-66-IL, UiO-66-20eq, UiO-66-50eq and UiO-66-100eq were 195.6, 214.8, 231.0, and 142.4 nm, respectively. Moreover, in the adsorption experiments for organic dyes (Rhodamine B), the defected UiO-66 with high miss linker defects exhibited remarkable performance in sewage treatment. The adsorption capacity of UiO-66-IL on Rhodamine B was 46.47, 47.47, and 47.65 mg g−1 at 303, 308, and 313 K, respectively. Our study provided a rational method in defects regulation of MOFs and guidance for future property optimization of MOFs materials. [Display omitted]