Articles
Zare narimani, A.,
Landrani, A.,
Bahadori, M.,
Moghadam, M.,
Tangestaninejad, S.,
Mohammadpoor baltork, I.,
Mirkhani, V. ACS Applied Bio Materials (25766422)8(6)pp. 5067-5077
In this study, heterogeneous biocatalysts were produced by successfully synthesizing the metal-organic framework (MOF) NH2-MIL-125(Ti) as a support, followed by the chemical stabilization of the lipase enzyme using the Ugi four-component reaction (Lipase-NH2-MIL-125), resulting in a stabilization efficiency of 87%. The amine group in MOF plays one of the reactants in the Ugi reaction, and a firm covalent bond is created between the enzyme and the support, which avoids enzyme leaching and leads to a stable biocatalyst. Enzyme efficiency, reusability, pH, and temperature stability of Lipase-NH2-MIL-125 have been investigated, and their high performance has been proven for the biocatalyst. The biodiesel production process using oleic acid has been utilized to evaluate the catalytic activity of the designed biocatalyst, and different parameters have been optimized. The results confirmed the good activity of Lipase-NH2-MIL-125 in biodiesel production, and even after 6 cycles, the activity slightly decreased, which confirmed the stability of the biocatalyst during the reaction. © 2025 American Chemical Society.
Colloids and Surfaces A: Physicochemical and Engineering Aspects (18734359)725
The development of epoxy adhesives with superior adhesion properties has long been a critical requirement in the high-tech applications. In this study, two metal organic frameworks (MOFs), MIL-101(Cr) (MIL, Matérial Institut Lavoisier) and NH2-MIL-101(Cr), were used to enhance the adhesion characteristics. These MOFs, were characterized by different analytical techniques, and subsequently integrated into high-temperature epoxy adhesives to improve their mechanical and thermal properties as well as adhesion strength. Notably, the addition of 0.3 parts per hundred resin (phr) of MIL-101(Cr) to the epoxy matrix resulted in an impressive ∼100 % increase in tensile strength and a remarkable 24 % enhancement in lap shear strength. Furthermore, the incorporation of the amine-functionalized NH2-MIL-101(Cr) into the epoxy matrix led to even more significant improvements in mechanical strength. The addition of just 0.3 phr of NH2-MIL-101(Cr) gave rise in a striking ∼150 % increment in tensile strength compared to the pristine epoxy adhesives, while lap shear strength experienced a substantial 50 % growth. The thermal stability of the epoxy adhesive was notably enhanced in the presence of the MOFs. Differential scanning calorimetry (DSC) analysis indicated an increase in the curing enthalpy upon the incorporation of both MIL-101(Cr) and NH2-MIL-101(Cr) into the epoxy matrices. The use of amine-functionalized MOFs significantly improved the thermal and mechanical properties of the epoxy adhesives, paving the way for the development of innovative epoxy formulations. © 2025
Karimian, E.,
Moslehi, M.,
Tangestaninejad, S.,
Moghadam, M.,
Malekpour, A.,
Mohammadpoor baltork, I. Scientific Reports (20452322)15(1)
This investigation focused on the design of an advanced polymeric scaffold that integrates Ethylcellulose (EC) and Polystyrene (PS) to fabricate four novel Metal-Organic Framework/Ethylcellulose-Polystyrene (MOF/ECPS) adsorptive membranes for the aim of water desalination. These membranes were created using in situ synthesis of ZIF-8, UiO-66-NH2-EDTA, and UiO-66- NH2 in the presence of electrospun ECPS nanofibers, along with ex-situ synthesis of MIL-125-NH2/ECPS electrospun nanofibers. The NaCl removal performance of these nanocomposite adsorptive membranes was evaluated under ideal conditions. These conditions included starting NaCl content, intercalated MOF percentage, pH, temperature, dosage, and adsorbent contact time. The synthesized nanocomposites were successfully recycled 25 times without experiencing a significant reduction in adsorption capacity, except for MIL-125-NH2, which showed a decrease after 18 recycles. In this investigation, four different kinetic models were utilized: Elovich, intraparticle diffusion, pseudo-first-order, and pseudo-second-order. Adsorption characteristics were found to be in line with pseudo-second-order kinetics. Analysis of the adsorption isotherm parameters using the Langmuir and Freundlich models revealed that the surfaces of UiO-66-NH2/ECPS, UiO-66-NH2-EDTA/ECPS, and ZIF-8/ECPS nanocomposites are heterogeneous and exhibit multilayer Na+ adsorption. In contrast, the adsorption of Na+ on the MIL-125-NH2/ECPS nanocomposite follows a monolayer adsorption mechanism. Studies in thermodynamics demonstrate that adsorption occurs as an exothermic and spontaneous process that adheres to pseudo-second-order kinetics and isotherm models. © The Author(s) 2025.
Mirzaei, R.,
Tangestaninejad, S.,
Marandi, A.,
Moghadam, M.,
Mohammadpoor baltork, I.,
Kardanpour, R.,
Abdolvand, H. Scientific Reports (20452322)15(1)
In this study, we synthesized two nanocomposites, cross-linked PVA/HKUST and PVA/ZIF-67, by integrating metal–organic frameworks (MOFs) into electrospun polyvinyl alcohol (PVA). Several characterization techniques including FTIR, XRD, ICP, SEM, TGA, UV–Vis, zeta potential, and N2 adsorption–desorption were employed. The adsorption performance of the composites for cefixime (CFX) removal was assessed under varying conditions such as MOF content, contact time, pH, initial CFX concentration, and temperature. ZIF-67 and HKUST contribute to the high adsorption efficiency of the composites by providing a porous structure with high surface area, facilitating interactions with CFX molecules, and enhancing the overall stability of the composite material in the removal process. The Langmuir isotherm model revealed a maximum adsorption capacity of 282.5 mg/g for PVA/HKUST and 211.4 mg/g for PVA/ZIF-67. Notably, CFX was rapidly removed within 50 min, demonstrating the high potential of these nanofibers in wastewater treatment. However, after six cycles, removal efficiencies declined from 88 to 74% for PVA/HKUST and from 85 to 59% for PVA/ZIF-67. © The Author(s) 2025.
