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Enhanced Formaldehyde Removal from Air Using Fully Biodegradable Chitosan Grafted β-Cyclodextrin Adsorbent with Weak
Zujin Yang1,2, Hongchen Miao3, Zebao Rui4
1School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China. yangzj3@mail.sysu.edu.cn.
A new biodegradable adsorbent, chitosan-β-cyclodextrin-glutaraldehyde (CGC), effectively removes formaldehyde (HCHO) from indoor air. This promising material demonstrates high adsorption capacity and reusability for formaldehyde treatment.
Area of Science:
- Environmental Chemistry
- Materials Science
- Adsorption Technology
Background:
- Formaldehyde (HCHO) is a significant indoor air pollutant.
- Developing effective and sustainable adsorbents for HCHO removal is crucial for improving indoor air quality.
Purpose of the Study:
- To synthesize and evaluate a fully biodegradable adsorbent for gaseous formaldehyde removal.
- To investigate the adsorption performance, mechanism, and reusability of the synthesized adsorbent.
Main Methods:
- Synthesis of a chitosan-β-cyclodextrin-glutaraldehyde (CGC) adsorbent.
- Continuous flow adsorption tests with varying parameters.
- Adsorption isotherm and kinetic studies (Freundlich, pseudo-second order).
- In situ DRIFTS studies to elucidate the adsorption mechanism.
Main Results:
- The CGC adsorbent exhibited high adsorption capacity for formaldehyde (up to 15.5 mg/g).
- Adsorption data best fitted the Freundlich isotherm model and kinetic data fitted the pseudo-second order model.
- The adsorbent maintained its capacity after four regeneration cycles.
- Synergistic effects of Schiff base reaction and hydrogen bonding were proposed as the adsorption mechanism.
Conclusions:
- The synthesized CGC adsorbent is a promising, biodegradable material for indoor formaldehyde treatment.
- The inclusion of β-cyclodextrin significantly enhances formaldehyde adsorption performance.
- CGC offers a sustainable solution for mitigating formaldehyde pollution in indoor environments.
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