Université de Monastir

With the growing emphasis on circular catalysis principles and green chemistry, addressing the dual challenge of wastewater treatment and sustainable catalysis has become increasingly critical. Although the adsorption of copper ions using magnetic biomaterials has been widely investigated, its full potential is still not fully understood. In particular, the reutilization of Cu(II)-loaded magnetic bacterial cellulose in circular green catalytic reactions remains underexplored. This study presents a novel magnetic bacterial cellulose-based material, designated as (BC-BPEM)@Fe₃O₄NPs, engineered through advanced chemical modifications to address these challenges. The adsorption kinetics followed a pseudo-second-order model, indicating chemisorption as the predominant mechanism. A key challenge addressed in this study was the efficient reuse of Cu(II)-loaded magnetic bacterial cellulose-based material. The recovered material was successfully employed as a catalyst in the synthesis of novel 1,4-disubstituted bis-1,2,3-triazoles under green conditions. Notably, the reaction achieved an impressive rate of 0.219 ± 0.006 mmol.g_cat^-1.min^-1 and a 99 % yield within 15 min, using green deep eutectic solvents (ChCl/Gly) and glutathione as a reducing agent. Remarkably, the catalyst retained its high catalytic performance over 20 cycles, maintaining yields consistently between 99 % and 97 %. This study not only emphasizes the seamless integration of adsorption and catalytic recycling but also highlights the sustainability of the approach. Environmental metrics revealed an E-factor of 0.442 kg waste/kg product, a PMI of 1.442 kg materials/kg product, and an RME of 99.83 %, reinforcing the potential of catalyst in both sustainable catalysis and environmental remediation.

Layered silicate clay can be modified with organic residues to enhance its adsorption properties and make it suitable for the removal of industrial hazardous substances in various industries.The modification process involves treating the clay with specific organic residues that can interact with and capture the targeted hazardous compounds effectively.Novel nano-composite adsorbing system was developed by inserting the products of powd. certain marine plant within the layers of layered silicate alumina clay (LS) through impregnation technique in order to form layered silicate alumina organic residue (LSOR).The SEM images showed clear agglomerations within the newly formed composite.Moreover, according to data obtained from Scherer equation extracted from XRD data all compounds under investigation were within the nanoscale.The newly prepared LSOR nano-composite showed a significant high adsorption capacity than the main reactants involved in the adsorbent formation process (LS and OR).The effects of various exptl. factors were followed up using batch system, and kinetics and isotherms of CR dye adsorption were calculated accordingly.Adsorbent dosage, working temperature, and pH value all have a significant impact on CR removal percentage.Regarding the optimum conditions, the best temperature for CR adsorption onto LSOR is 40°C at a neutral pH medium.Adsorption isotherm study shows that the adsorption process could be followed up using Langmuir adsorption isotherm for OR while it follows Freundlich isotherm for LS adsorbent and can be followed up successfully by Temkin isotherm model in case of LSOR.Finally, field tests revealed that the LSOR nano-catalyst removed mixed dyes from industrial wastewater with a 93% performance.This outcome further solidifies the potential of LSOR nano-adsorbents as an eco-friendly solution for the treatment and reuse of industrial wastewater.It highlights the significant contribution of these new nano-adsorbents in promoting sustainable practices and addressing the challenges associated with industrial wastewater management.

In this study, we designed four new non-fullerene acceptors (ANF1-ANF4) for organic photovoltaic cells derived from a well-known reference compound, Y15.The terminal acceptor of Y15 was modified by removing the chlorine atoms and adding a cyano group at four different positions.To explore the impact of the cynao group substitutions, we investigated the optoelectronic properties of the derived mols. using d. functional theory (DFT) and time d. functional theory (TD-DFT).We assessed several characteristics of the created compounds, including charge mobilities, mol. planarity parameters, mol. electrostatic potential, frontier MOs, transition d. matrix, interfragment charge transfer (IFCT), and non-covalent interactions (NCI).Compared to the primary mol. Y15, we discovered that all tailored mols. have more planar geometries, a smaller energy gap ranging from 1.55 to 1.60 eV, and better optical properties with a maximum of absorption ranging from 759 nm to 796 nm in the chloroform phase.Moreover, we found that, except ANF4, all the other proposed mols. exhibit higher conductivity due to their lower reorganizational energy values compared to the reference mol. Y15.In particular, the investigation results showed that, given its promising optoelectronic and photovoltaic properties, ANF1 would be a great candidate for usage in the creation of high-performance organic solar cells.