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Dr. Huan Wang
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School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China
Interests: biomass-based polymer materials; energy storage; chemicals; green synthesis method; photoelectric material; biomass valorization; functional polymeric materials

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Dear Colleagues,

Biomass, as the most abundant sustainable resource in nature, is one of the most promising substitutes for fossil resources. Over the past years, tremendous efforts have been devoted to the valorization of biomass in energy storage, materials, and chemicals. Biomass-based polymer materials with novel properties and applications are drawing extensive attention due to their biocompatibility and biodegradability. Synthesizing biomass-based polymer materials with new functionalities via green routes will bring about profound changes in the way we utilize biomass, especially by promoting the clean production of biomass and the development of a circular economy.

This Special Issue is devoted to the most recent research on these topics, covering all aspects concerning the synthesis and application of biomass-based polymers.

Dr. Huan Wang
Guest Editor

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Keywords

biomass-based polymer materials
energy storage
chemicals
green synthesis methods
photoelectric materials
biomass valorization
functional polymeric materials

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Research

Open AccessArticle

Silver Ions Drive Ordered Self-Assembly Mechanisms and Inherent Properties of Lignin Nanoflowers

and

Polymers 2023, 15(17), 3541; https://doi.org/10.3390/polym15173541 - 25 Aug 2023

Viewed by 303

Abstract

Designing anisotropic lignin-based particles and promoting the high-value utilization of lignin have nowadays drawn much attention from scientists. However, systematic studies addressing the self-assembly mechanisms of anisotropic lignin-based particles are scarce. In this work, an interaction including the electrostatic forces and chelating forces between lignin and Ag⁺ was regulated via carboxymethylation modification. Subsequently, the aggregation morphology of carboxymethylated lignin in a Ag⁺ solution was observed via SEM. The result showed that a large number of Ag⁺ intercalated into the lignin molecules when the grafting degree of the carboxyl groups increased from 0.17 mmol/g to 0.53 mmol/g, which caused the lignin molecules to gradually transform from disordered blocks to ordered layers. Dynamics research indicated that the adsorption process of Ag⁺ in carboxymethylated lignin conforms to the Pseudo-first-order kinetic model. The saturated adsorption amount of Ag⁺ in the carboxymethylated lignin reached 1981.7 mg/g when the grafting rate of carboxyl groups increased to 0.53 mmol/g, which then fully intercalated into lignin molecules and formed a layered structure. The thermodynamic parameters showed that the thermal adsorption process conforms to the Langmuir model, which indicates that Ag⁺ is monolayer-adsorbed and intercalated into lignin molecules. Meanwhile, the ΔH values are more than 0, which suggests that this adsorption process is a endothermic reaction and that a higher temperature is conducive to an adsorption reaction. Therefore, self-assembly of lignin in a Ag⁺ solution under 70 °C is more conducive to the formation of a nanoflower structure, which is consistent with our experimental result. Finally, pH-responsive Pickering emulsions were successfully prepared using a lignin-based nanoflowers, which demonstrated their potential as a catalytic platform in the interface catalysis field. This work offers a deeper understanding into the formation mechanism of anisotropic lignin-based nanoflowers and hopes to be helpful for designing and preparing anisotropic lignin-based particles. Full article

(This article belongs to the Special Issue Green Synthesis of Polymers)

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