Synthesis, modification, and adsorption properties of Yb‐MOF: Kinetic and thermodynamic studies

Abstract

In this paper, a novel Yb metal–organic frameworks {[Yb(L)(DMA)(H2O)]·(3H2O)}n (Yb‐MOF, H3L is 4‐(N,N′‐bis(4‐carboxylbenzyl)amino)benzenesulfonic acid) was synthesized by solvothermal reaction. Modified Yb‐MOF was prepared by the potassium permanganate method for removing the Cu(II) and As(V) from simulated wastewater. The optimal pH value of modified Yb‐MOF for Cu(II) and As(V) adsorption was 5, and the optimal dosage of adsorbent was 0.04 mg/10 ml by static adsorption test. Four isothermal adsorption models (Freundlich, Langmuir, Temkin, and Dubinin–Radushkevich models) were fitted and analyzed. The adsorption processes of Cu(II) and As(V) were consistent with Freundlich, Langmuir, and Temkin models. The highest Cu(II) and As(V) adsorption capacity are 59.418 and 81.169 mg/g, respectively. The adsorption kinetic model and thermodynamic analysis of the modified Yb‐MOF for Cu(II) and As(V) were studied. The results showed revealed that the pseudo‐second‐order kinetic had a higher correlation association with the Cu(II) and As(V) adsorption process, indicating that chemisorption was dominant in both processes. At 298 and 308 K, the Cu(II) and As(V) adsorption by modified Yb‐MOF is spontaneous.

Wood Cellulose Nanofibers Grafted with Poly(ε-caprolactone) Catalyzed by ZnEu-MOF for Functionalization and Surface Modification of PCL Films

“…Peaks near 3144 cm −1 originated from the C-H stretching vibration of the benzene ring. The typical stretching vibration of the C=O double bond of ligand H 2 L was observed at approximately 1720 cm −1 , while in the ZnEu-MOF spectrum, the corresponding peak red-shifted to 1629 cm −1 , indicating that the carboxyl group in the ZnEu-MOF was deprotonated and coordinated with the metal ions [ 49 ]. The characteristic asymmetric stretching vibration of the C=C bond in the benzene ring was observed at 1450–1610 cm −1 [ 50 ],and the vibrations of the C=N double bond of the imidazole ring in the ZnEu-MOF and H 2 L ligand were located at 1593 cm −1 and 1612 cm −1 , respectively [ 51 ].…”

Novel Carbazole-Based Porous Organic Polymer for Efficient Iodine Capture and Rhodamine B Adsorption

“…As is well known, water pollution , is an important problem to be solved at present. In recent years, various industrial and textile wastewater has been illegally discharged into water bodies, which can cause serious damage to the environment and even the human body. In depth, the large amount of highly soluble organic dyes highly dissolved in wastewater is one of the major reasons for this undesirable situation.…”