Dataset Information

Imide-Based Polymers of Intrinsic Microporosity: Probing the Microstructure in Relation to CO₂ Sorption Characteristics.

ABSTRACT: A range of microporous, imide-based polymers were newly synthesized using two-step poly-condensation reactions of bis(carboxylic anhydride) and various aromatic diamines for CO₂ gas capture and storage applications. In this report, we attempted to assess the relative significance of molecular structural aspects through the manipulation of the conformational characteristics of the building blocks of the polymeric structures, the spiro-containing acid anhydride and the aromatic amines, to induce greater intrinsic microporosity and higher surface areas for the resulting solids. Results obtained from this study were thus used to outline a working relationship between the structural diversity of the constructed porous solids and their performance as CO₂ sorbents.

SUBMITTER: Elmehalmey WA

PROVIDER: S-EPMC6641620 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature

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Imide-Based Polymers of Intrinsic Microporosity: Probing the Microstructure in Relation to CO<sub>2</sub> Sorption Characteristics.

Elmehalmey Worood A WA Azzam Rasha A RA Hassan Youssef S YS Alkordi Mohamed H MH Alkordi Mohamed H MH Madkour Tarek M TM

ACS omega 20180308 3

A range of microporous, imide-based polymers were newly synthesized using two-step poly-condensation reactions of bis(carboxylic anhydride) and various aromatic diamines for CO<sub>2</sub> gas capture and storage applications. In this report, we attempted to assess the relative significance of molecular structural aspects through the manipulation of the conformational characteristics of the building blocks of the polymeric structures, the spiro-containing acid anhydride and the aromatic amines, ...[more]

PMID: 31458552

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Project description:Owing to their high surface area and superior adsorption properties, spirobifluorene polymers of intrinsic microporosity (PIMs), namely PIM-SBF-Me (methyl) and PIM-SBF-tBu (tert-butyl), were used for the first time, to our knowledge, for the removal of methylene blue (MB) dye from wastewater. Spirobifluorene PIMs are known to have large surface area (can be up to 1100 m2 g-1) and have been previously used mainly for gas storage applications. Dispersion of the polymers in aqueous solution was challenging owing to their extreme hydrophobic nature leading to poor adsorption efficiency of MB. For this reason, cationic (cetyl-pyridinium chloride), anionic (sodium dodecyl sulfate; SDS) and non-ionic (Brij-35) surfactants were used and tested with the aim of enhancing the dispersion of the hydrophobic polymers in water and hence improving the adsorption efficiencies of the polymers. The effect of surfactant type and concentration were investigated. All surfactants offered a homogeneous dispersion of the polymers in the aqueous dye solution; however, the highest adsorption efficiency was obtained using an anionic surfactant (SDS) and this seems owing to the predominance of electrostatic interaction between its molecules and the positively charges dye molecules. Furthermore, the effect of polymer dosage and initial dye concentration on MB adsorption were also considered. The kinetic data for both polymers were well described by a pseudo-second-order model, while the Langmuir model better simulated the adsorption process of MB dye on PIM-SBF-Me and the Freundlich model was more suitable for PIM-SBF-tBu. Moreover, the maximum adsorption capacities recorded were 84.0 and 101.0 mg g-1 for PIM-SBF-Me and PIM-SBF-tBu, respectively. Reusability of both polymers was tested by performing three adsorption cycles and the results substantiate that both polymers can be effectively re-used with insignificant loss of their adsorption efficiency (%AE). These preliminary results suggested that incorporation of a surfactant to enhance the dispersion of hydrophobic polymers and adsorption of organic contaminants from wastewater is a simple and cost-effective approach that can be adapted for many other environmental applications.

Dataset Information

Imide-Based Polymers of Intrinsic Microporosity: Probing the Microstructure in Relation to CO₂ Sorption Characteristics.

Publications

Imide-Based Polymers of Intrinsic Microporosity: Probing the Microstructure in Relation to CO<sub>2</sub> Sorption Characteristics.

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Dataset Information

Imide-Based Polymers of Intrinsic Microporosity: Probing the Microstructure in Relation to CO2 Sorption Characteristics.

Publications

Imide-Based Polymers of Intrinsic Microporosity: Probing the Microstructure in Relation to CO<sub>2</sub> Sorption Characteristics.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets

Imide-Based Polymers of Intrinsic Microporosity: Probing the Microstructure in Relation to CO₂ Sorption Characteristics.