Fabrication of a Fibrous Metal–Organic Framework and Simultaneous Immobilization of Enzymes

Abstract

A nanorod-like lanthanum metal–organic framework (LaMOF) was synthesized in aqueous solution by coordinating La(III) to the ligand 1,3,5-benzenetricarboxylic acid. The fibrous LaMOF was fabricated by splitting the nanorod-like LaMOF in a solution of d -amino acid oxidase, and the enzyme was immobilized simultaneously. Based on SEM and TEM images, STEM mapping, and spectra of XPS and FTIR, the mechanism of formation of the fibrous LaMOF and the distinct interfacial phenomena have been elucidated. The fabrication of the fibrous LaMOF and simultaneous immobilization of the enzyme were carried out in aqueous solutions at room temperature, without using any organic solvent. It is a clean and time- and energy-effective process. This work presents a distinct and clean methodology for the fabrication of the fibrous MOF. Potentially, the environmentally benign methodology can be extended to immobilize other enzymes.

A novel lanthanum‐based phosphorus‐containing flame retardant agent and its application in polylactic acid

“…In Figure 4c, the peaks of La3d high‐resolution spectra were 835.6, 838.8, 852.2, and 855.4 eV, respectively, which belonged to the LaO bond 37 . The binding energies of 835.6 and 852.2 eV correspond to the two main peaks of 3d 5/2 and 3d 3/2 , and the binding energies of 838.8 and 855.4 eV were attributed to the satellite peaks 38,39 . The binding energies corresponding to the O1s characteristic peaks of DDP in Figure 4d were 532.2 eV and 533.5 eV, respectively.…”

“…37 The binding energies of 835.6 and 852.2 eV correspond to the two main peaks of 3d 5/2 and 3d 3/2 , and the binding energies of 838.8 and 855.4 eV were attributed to the satellite peaks. 38,39 The binding energies corresponding to the O1s characteristic peaks of DDP in Figure 4d were 532.2 eV and 533.5 eV, respectively. Compared with DDP, the new binding energy peak of O1s at 532.9 eV was attributed to the oxygen atom from coordination water in La@DDP.…”

Synthesis of Zr/La-BTC Bimetallic Metal-Organic Framework (MOF) for Oleic Acid Esterification

“…1,3,5-benzene tricarboxylic acid (H3BTC) is a carboxylate-based organic ligand. Often used as a linker in MOF synthesis, it provides strong and stable MOF structures [13][14][15] . Li et al used a hydrothermal method to make La-BTC, which was very stable and worked well as an electrochemical catalyst for reducing H2O2 in acidic conditions 16 .…”