Work

Upcycling of Agro-Waste: Research on Performance of a Novel Super-Hygroscopic Material Prepared by Exploiting the Porous Structure of Steam-Exploded Modified Corn Stalk Pith

Year: 2025

Type: article

Abstract: Herein, a novel super-hygroscopic material, steam-exploded modified corn stalk pith (SE-CSP), was developed from corn stalk pith (CSP) via the steam explosion (SE) method, and its hygroscopic properties and mechanisms were evaluated. The results confirmed that SE effectively removed lignin and hemicellulose, disrupted the thin cell walls of natural CSP, and formed an aligned porous structure with capillary channels. SE changed the bonding distribution and surface morphology, and enhanced the crystallinity and thermal stability of CSP. The equilibrium hygroscopic percentage of SE-CSP (62.50%) was higher than that of CSP (44.01%) at 25 °C and 80% relative humidity (RH), indicating significantly greater hygroscopicity. The hygroscopic process of SE-CSP followed a Type III isotherm and fitted the Guggenheim-Anderson-de Boer (GAB), Peleg, and pseudo-first-order kinetic models. This process exhibited multi-layer adsorption with enthalpy-driven, exothermic behavior, primarily through physical adsorption involving hydrogen bonds and van der Waals forces. This work offered a new approach for advancing sorption dehumidification technology.

Source: Polymers

DOI: 10.3390/polym17131779

Authors: Nan Wang, Chuntao Xia, Shanshan Zhang, Tingting Liu, Dawei Wang

Institution: Jilin Agricultural University

Language: English

Topic: Hygrothermal properties of building materials

Subfield: Building and Construction

Field: Engineering

Domain: Physical Sciences

SDGs: Responsible consumption and production, Climate action

Open Access status: gold

Estimated APC paid: $3,258