Biodegradable porous adsorbent for efficient formaldehyde removal from indoor air

被引:0
|
作者
Li, Furong [1 ]
Zhu, Tao [1 ]
Yang, Jun [1 ]
Yuan, Bo [1 ]
Zhang, Xueli [1 ]
Ju, Qiuge [1 ]
Li, Chen [1 ]
Wang, Meidan [1 ]
Zhang, Xinyue [1 ]
机构
[1] China Univ Min & Technol Beijing, Sch Chem & Environm Engn, Beijing 100083, Peoples R China
关键词
Porous materials; Indoor formaldehyde absorption; Biomass; Polyethyleneimine-alginate-carboxymethyl; cellulose; CARBOXYMETHYL CELLULOSE; ADSORPTION; BEADS; GAS;
D O I
10.1016/j.envres.2025.121453
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Prolonged formaldehyde exposure in indoor environments poses significant health risks. This study presents a biodegradable, cost-effective porous adsorbent engineered for efficient formaldehyde removal from indoor air. Comprising alginate, carboxymethyl cellulose, and attapulgite, the composite adsorbent leverages alginate and carboxymethyl cellulose to establish a stable porous framework, while attapulgite optimizes pore architecture. Polyethyleneimine was incorporated to introduce amino functional groups, thereby enhancing adsorption performance. At a polyethyleneimine concentration of 7 wt%, the adsorbent achieved a formaldehyde adsorption capacity of 2.31 mg/g, with a distribution coefficient quadrupling that of activated carbon at only 30 % of its cost. Adsorption kinetics conformed to a pseudo-second-order model, and isotherm analysis aligned with the Sips model, suggesting chemisorption as the predominant mechanism, complemented by physisorption. Moreover, the adsorbent demonstrated outstanding reusability and biodegradability, retaining 94.29 % of its initial capacity after four regeneration cycles and exhibiting a decomposition rate of 49 % after 30 days. This study provides a sustainable, high-performance solution for indoor formaldehyde removal with strong potential for practical applications.
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页数:14
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