ユーカリ樹皮を利用した水・空気浄化およびCO₂回収技術（Tree bark could help clean water and air）

2025-05-05 ロイヤルメルボルン工科大学（RMIT）

＜関連情報＞

• https://www.rmit.edu.au/news/all-news/2026/may/bark-air-filter
• https://www.sciencedirect.com/science/article/pii/S096195342600317X

ユーカリ樹皮廃棄物を微細多孔質炭素材料に有効活用し、効率的なCO2回収を実現する Sustainable valorisation of eucalyptus bark waste into microporous carbon materials for efficient CO2 capture

Pallavi Saini, Shailza Sharma, Selvakannan Periasamy, Deshetti Jampaiah, Suresh K. Bhargava
Biomass and Bioenergy  Available online: 10 March 2026
DOI:https://doi.org/10.1016/j.biombioe.2026.109242

Graphical abstract

Highlights

• Sustainable activated carbons were synthesized from abundant eucalyptus bark via a simple one-step ZnCl₂ chemical activation route.
• Optimized material (1:2ZAC-B) achieved an ultrahigh BET surface area of 2210 m² g⁻¹ and significantly enhanced micropore volume.
• Demonstrated high CO₂ uptake of 6.98 mmol g⁻¹ (273 K) outperforming many biomass-derived carbons.
• CO₂ adsorption behaviour followed Langmuir–Freundlich models, confirming favorable physisorption governed by micropore filling.
• Highlights the scalable, low-cost valorisation of eucalyptus waste into high-performance sorbents for carbon capture and storage (CCS) applications.

Abstract

Sustainable porous carbon materials are of growing interest for CO₂ capture because of their tunable porosity, low cost, and renewable origin. In this study, high-performance activated carbons were synthesized from eucalyptus bark waste using a simple one-step chemical activation strategy based on physical mixing with zinc chloride (ZnCl₂). Hydrochars derived from eucalyptus bark were mixed with ZnCl₂ at mass ratios ranging from 1:1 to 1:4 and thermally treated to produce predominantly microporous carbons with Brunauer–Emmett–Teller (BET) surface areas between 1144 and 2210 m² g⁻¹ and enhanced micropore volumes. The optimized sample, 1:2ZnCl₂-AC-Bark (1:2ZAC-B), exhibited a high surface area of 2210 m² g⁻¹ and delivered CO₂ uptake capacities of 6.98 mmol g⁻¹ at 273 K and 3.0 mmol g⁻¹ at 298 K. The adsorption behavior was well described by Langmuir and Freundlich isotherms, indicating favorable physisorption dominated by micropore filling. This study demonstrates the potential of underutilized eucalyptus bark as a low-cost and scalable precursor for producing advanced activated carbon sorbents for CO₂ capture and storage applications.