Benign Synthesis of Metal-Organic Framework (MIL-101-Cr) and Evaluation of Carbon-dioxide Adsorption Behaviour Employing Adsorption Isotherm Models

Background: In today’s world, rising temperature due to global warming is caused by higher concentration of carbon dioxide (CO2) emissions in the atmosphere. Metal-Organic Framework (MOF) materials have the potential to be used in carbon dioxide capture and utilization technology. Objective: The purpose of this work is to prepare metal-organic framework materials by a benign synthesis method using water as the solvent, followed by the characterization and property evaluation for CO2 adsorption study. Methods: MIL-101-Cr metal-organic framework and its derivatives with alkali ion dopants were prepared by benign hydrothermal synthesis route, which were characterized by powder X-ray diffraction method. The adsorption isotherms of CO2 for MIL-101-Cr and its derivatives were studied to comprehend the influence of alkali dopants on CO2 sorption behaviour. The equilibrium uptakes of CO2 were further evaluated by fitting the isotherms with Langmuir, Toth and Dubinin – Astakohv adsorption models to determine the adsorption parameters. Results: The crystalline structural integrity of MIL-101-Cr is not affected by doping with alkali ions. The isosteric heat of CO2 adsorption is diminished with an increase in alkali dopant size, while the induced surface structural heterogeneity increases with increasing alkali dopant size. Conclusion: The equilibrium and thermodynamic parameters calculated from this study are useful for applications in carbon dioxide capture and utilization technology.

Trends in the Synthesis of Polyimides and Their Nanocomposites

This review presents the current achievements in the ecologically friendly synthesis of polyimides. The progress in the formulation and applications of different nanocomposites based on polyimides are highlighted. The enormous potential of the polymers and composites under consideration in environmentally benign synthesis and various application fields is shown.

Recent Advances in the Green Synthesis of Heterocycles: From Building Blocks to Biologically Active Compounds

: Recent advances in the environmentally benign synthesis of common heterocycles are described. This account features three main parts; the preparation of non-aromatic heterocycles, one-ring aromatic heterocycles and their condensed analogs. Due to the great variety of and high interest in these compounds, this work focuses on providing representative examples of the preparation of the target compounds.

Zinc Oxide Nanoparticles Promoted Highly Efficient and Benign Synthesis of 3,4-Dihydropyrimidine-2(1H)-one/thione Derivatives

Using the synthetic potential of recyclable zinc oxide(ZnO) nanoparticles (NPs), a proficient, elegant, and rapid one-pot synthesis of a variety of 3,4-dihydropyrimidine-2(1H)-one/thione derivatives from the1,3-dicarbonyl compound, urea/thiourea, and various aromatic aldehydes havebeen unveiled in the present research. TheZnONPs were synthesized by theco-precipitation method. The powder X-ray diffraction method was employed for the determination of thecrystallite size of the synthesized ZnONPs.The hexagonal phase was obtained in the XRD pattern of the synthesized ZnO NPs with anaverage crystallite size of 25 nm.The current synthetic strategy offers excellent yields, a short reaction time, favorable reaction conditions, easy transformation, non-chromatographic product purification, and catalyst recyclability. Furthermore, the catalyst could be retrieved and reused without losing any of its catalytic activity. As a result, this elegant protocol is an adequate method fordihydropyrimidinone/thione synthesis.