Synthesis of reticular long-carbon-chain polysiloxane and its hydrophobic modification of phosphogypsum-based materials

Hydrogel-based softmaterials have attracted significant attentions in various fields due to their high water content, good biocompatibility and variable mechanical strength. However, due to the hydrophilic properties of hydrogel networks, most of the hydrogel-based soft materials are easy to swell in water and have monotonous surface wettability. Here, taking advantage of the intrinsic hydrophobicity of siloxane, novel heteronetwork organohydrogels were synthesized by covalently integrating reactive siloxane monomers into the hydrophilic hydrogel networks through emulsion polymerization. The surface of the heteronetwork organohydrogels exhibited adaptive wettability owing to the rearrangement of the surface chemistry induced by different solvent condition. Moreover, the heterogeneous networks endowed organohydrogels with excellent antiswelling abilities in water or oil (n-heptanes). The potential application of the prepared organohydrogels in the field of oil/water separation was also preliminarily explored. The idea and method of integrating polysiloxane into hydrogels in this study might provide a new insight to develop high-performance polysilxane-based heteronetwork gel materials.

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Multifaceted Surface Analysis of Municipal Solid Waste Incineration Fly Ash by Water Repellent Treatment with Fatty Acid

Kaseda,

Shirata,

Koike

2024

Waste

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In this study, we aimed to conduct a multifaceted surface analysis of water repellent-treated municipal solid waste incineration (MSWI) fly ash to determine the suppression mechanism of fatty acid elution. The surface of water repellent-treated MSWI fly ash was analyzed using scanning electron microscopy, Fourier-transform infrared spectroscopy, and X-ray diffraction analyses. Scanning electron microscopy revealed the absence of needle-shaped crystals but distinct particle agglomeration in the water repellent-treated fly ash. Fourier-transform infrared spectroscopy revealed that the water repellent treatment caused fatty acids to form esters with aluminosilicates in the MSWI fly ash. Crystalline phase analysis of the water repellent-treated fly ash before and after the leaching test via X-ray diffraction revealed the presence of fatty acids on the fly ash surface and retention of the fatty acid coating. Overall, the multifaceted surface analysis revealed that water repellent treatment suppressed heavy metal elution by covering the surface of MSWI fly ash with hydrophobic groups.

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Synthesis of reticular long-carbon-chain polysiloxane and its hydrophobic modification of phosphogypsum-based materials

Abstract: Phosphogypsum is a solid waste that is discharged in large quantities during the production of phosphoric acid. The hemihydrate phosphogypsum produced after dewatering has great potential for application in the...

Cited by 3 publications

References 37 publications

Organohydrogels with adaptive surface wettability enabled by polyacrylamide/polysiloxane emulsion-based heteronetworks

Organohydrogels with adaptive surface wettability enabled by polyacrylamide/polysiloxane emulsion-based heteronetworks

Organohydrogels with Adaptive Surface Wettability Enabled by Polyacrylamide/Polysiloxane Emulsion-based Heteronetworks

Multifaceted Surface Analysis of Municipal Solid Waste Incineration Fly Ash by Water Repellent Treatment with Fatty Acid

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