Cross-linker-free fabrication of chitosan–MnO2 composite aerogels with synergistic adsorption-catalysis for high-efficiency room-temperature formaldehyde elimination

IF 2.5 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Yulong Fan, Wuyu Wang and Xuelai Zhao
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引用次数: 0

Abstract

Formaldehyde (HCHO) is a hazardous indoor air pollutant, yet conventional powdered adsorption materials suffer from aggregation and stability challenges. In this study, a chitosan–manganese dioxide (CS–MnO2) composite aerogel was fabricated via a freeze-drying method without cross-linking agents to achieve synergistic adsorption and catalytic degradation of HCHO. The optimized CS–M2 aerogel leverages the structural stability of CS and the high surface activity of MnO2, ensuring uniform MnO2 dispersion and mitigating aggregation issues. The aerogel exhibits outstanding room-temperature performance, achieving an HCHO removal efficiency of 90.26% within 6 hours and an adsorption capacity of 38.99 mg g−1, three times higher than that of pure CS. Kinetic analysis confirms a pseudo-second-order adsorption mechanism (R2 = 0.994), supported by a hierarchical porous structure and excellent thermal stability (>250 °C), indicating potential flame-retardant properties. This work overcomes the trade-off between MnO2 dispersion and reactivity through a green, scalable synthesis strategy, enabling persistent HCHO mineralization. The proposed approach advances the design of multifunctional aerogels for practical indoor air purification, effectively addressing environmental and health concerns.

Abstract Image

无交联剂制备壳聚糖-二氧化锰复合气凝胶的协同吸附-催化高效室温甲醛去除
甲醛(HCHO)是一种有害的室内空气污染物,但传统的粉末吸附材料存在聚集性和稳定性方面的问题。本研究采用冷冻干燥法制备壳聚糖-二氧化锰(CS-MnO2)复合气凝胶,以实现对HCHO的协同吸附和催化降解。优化后的CS - m2气凝胶利用CS的结构稳定性和MnO2的高表面活性,确保MnO2均匀分散,减轻聚集问题。气凝胶表现出优异的室温性能,在6小时内对HCHO的去除效率为90.26%,吸附量为38.99 mg g−1,是纯CS的3倍。动力学分析证实了伪二级吸附机制(R2 = 0.994),层次化多孔结构和优异的热稳定性(>250°C)支持,表明潜在的阻燃性能。这项工作通过绿色、可扩展的合成策略克服了二氧化锰分散和反应性之间的权衡,实现了持续的HCHO矿化。提出的方法推进了多功能气凝胶的设计,用于实用的室内空气净化,有效地解决了环境和健康问题。
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来源期刊
New Journal of Chemistry
New Journal of Chemistry 化学-化学综合
CiteScore
5.30
自引率
6.10%
发文量
1832
审稿时长
2 months
期刊介绍: A journal for new directions in chemistry
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