数字农科院2.0

Decoupling surface area from function: isolating the dominant role of surface chemistry in superior chlortetracycline adsorption on a low-porous biochar

文献类型： 外文期刊

作者： Peng, Qiaohui;Huang, Xiangyu;Wu, Nannan;Zhang, Yifan;Liu, Yi;Duan, Na;Yang, Rui;Zhang, Dongdong

作者机构：

关键词： Low-surface-area biochar;Decoupling effects;Surface functionalization;Waste valorization;CTC adsorption;OFGs

期刊名称： BIORESOURCE TECHNOLOGY

ISSN： 0960-8524

年卷期： 2025 年 443 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： While increasing surface functional groups is known to enhance the adsorption capacity of biomass-based adsorbents, previous modification methods typically also caused a significant increase in specific surface area (SSA), making it difficult to decouple the two effects. This study aims to isolate the role of surface chemistry. We introduce a function over form paradigm, developing a low-energy pathway that valorizes waste bamboo into a superior adsorbent by precisely engineering its surface chemistry while deliberately keeping its SSA low and constant. A novel two-step strategy involving low-temperature torrefaction (300 degrees C) and alkali modification (80 degrees C) successfully grafted a high density of oxygenated functional groups (OFGs) onto a biochar with a final, ultra-low SSA of only 4.23 m2/g. This approach provides two key insights: 1) It demonstrates that dramatically improving adsorption performance is possible by increasing OFGs without altering the material's physical structure. 2) It proves that even a material with negligible SSA can be endowed with exceptional functionality. The resulting biochar exhibited a remarkable maximum adsorption capacity for chlortetracycline (CTC) of 414.93 mg/g, governed by chemisorption at these engineered surface sites. This work provides direct evidence that high performance can be achieved through surface chemistry alone, establishing a more sustainable design principle for advanced functional materials.

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