Cheng et al. (2024): Quaternized Plant-Based Porous Biochar for Direct Air Capture of CO2 by Moisture-Swing Adsorption

Xinyue Cheng, Xueyan Sun, Shiqiang Zheng, Wenjia Zhou, Zhen Yuan, Liangliang Zhu, Xi Chen IN: Industrial & Engineering Chemistry Research, https://doi.org/10.1021/acs.iecr.3c03023

In this work, through a quaternization process, inexpensive and readily available plant-based biochars including walnut shell, cornstalk, rice husk, and long-stalked lentil shell were prepared as moisture-swing adsorbents to capture CO₂ from ambient air. Among these biochar adsorbents, the most effective one was found to be the quaternized long-stalked lentil shell, whose CO₂ adsorption capacity reached 0.88 mmol/g at 25 °C and 50% relative humidity, which is around five times that of previously reported biochar moisture-swing adsorbents (including bamboo cellulose and chitosan aerogel).

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