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.
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.
Sharifi, M.,
Tangestaninejad, S.,
Moghadam, M.,
Marandi, A.,
Mirkhani, V.,
Mohammadpoor baltork, I.,
Aghayani, S. Scientific Reports (20452322)15(1)
Biodiesel presents a sustainable alternative to fossil fuels, yet traditional homogeneous catalysts like sodium and potassium hydroxide face challenges with separation and reuse. Calcium oxide (CaO) is an effective heterogeneous catalyst for biodiesel production, but its chemical instability under reaction conditions restricts its long-term performance. This study introduces MOF-mediated synthesis (MOFMS) of heterogeneous catalysts, specifically CaO@ZnO and ZnO@CaO nanocomposites, from inexpensive and non-toxic metal salts and linkers in water. Comprehensive characterization techniques, including XRD, FT-IR, BET, FE-SEM, ICP, and CO2-TPD, were employed to analyze these catalysts. When applied to biodiesel production from soybean oil at ambient temperature and pressure, CaO@ZnO and ZnO@CaO achieved impressive biodiesel conversion rates of 99% and 92%, respectively, within 25 min. Both catalysts maintained their activity over six utilization cycles, with Ca²⁺ leaching remaining below 4% (2% for CaO@ZnO and 4% for ZnO@CaO) after the sixth run. These results provide valuable insights into catalyst preparation and leaching control, enhancing reusability in biodiesel production. Future research should aim to improve the long-term stability and reusability of these catalysts, investigate their performance with various feedstocks, and evaluate the feasibility for industrial applications. © The Author(s) 2025.
Safaei, S.,
Tangestaninejad, S.,
Moghadam, M.,
Bahadori, M.,
Mohammadpoor baltork, I.,
Omidvar, A.,
Mirzaeian, M. Journal of Industrial and Engineering Chemistry (1226086X)
Herein, vanadyl acetylacetonate and manganese(Ⅱ) acetylacetonate complexes were anchored into aminated UiO-66(Zr) via a condensation reaction (V-SB-UiO-66 and Mn-SB-UiO-66), where terminal amine groups formed imine linkage with the metal acetylacetonate complexes. Unlike conventional post-synthetic modification (PSM) strategies, our approach eliminates complex ligand exchange processes, offering a versatile platform for designing robust heterogeneous catalysts. This PSM approach, utilizing straightforward linker functionalization, introduces catalytic sites onto the MOF structure, facilitating heterogeneous catalytic epoxidation reactions. Comprehensive characterization techniques, including PXRD, N2 adsorption/desorption, FT-IR, FE-SEM, ICP-OES, TG-DTG, and XPS, confirmed the structural integrity during the PSM, successful anchoring of acetylacetonate complexes, the catalyst surface constitution and location of active Schiff-base functionalities on the UiO-66 scaffold. The density functional theory (DFT) calculations are also performed to investigate the pristine as well as functionalized MOFs. The structural and electronic properties, binding energies, reactivity descriptors, and time-dependent DFT (TD-DFT) analyses are performed to determine the behaviour of the considered systems. The catalytic performance of these Schiff base-functionalized UiO-66 s was evaluated for olefin epoxidation by tert-butyl hydroperoxide (TBHP) under various reaction conditions, achieving 44–99 % conversion and 57–96 % selectivity for cyclic, linear, and aromatic alkenes. Additionally, these catalysts demonstrated reusability for up to five cycles without significant structural changes. © 2025
