School of Agriculture, Sun Yat-sen University, Guangzhou, Guangdong 510275, China; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
Bioresour Technol. 2022 Oct;362:127838. doi: 10.1016/j.biortech.2022.127838. Epub 2022 Aug 27.
This study innovated the concept in designing an efficient and reusable microwave (MW) absorbent through concurrent exploitation of carbon graphitization, oxygen functionalization, and carbothermal iron reduction underpinned by an endothermic co-pyrolysis of wood waste and low-dosage iron. A powerful MW assimilation was accomplished from nanoscale amorphous magnetic particles as well as graphitized microporous carbon-iron skeleton in the biochar composites. Relative to a weak magnetic loss derived from the iron phase, the graphitic carbon architecture with abundant surface functionalities (i.e., CO and CO) exhibited a strong dielectric loss, which was thus prioritized as major active sites during MW reuse. The MW-absorbing biochar demonstrated a fast, robust, and durable removal of a refractory herbicide (2,4-dichlorophenoxy acetic acid) under mild MW irradiation with zero chemical input, low electricity consumption, and negligible Fe dissolution. Overall, this study will foster carbon-neutral industrial wastewater treatment and wood waste valorization.
本研究通过木材废料与低剂量铁的吸热共热解，同时利用碳石墨化、氧功能化和碳热还原，创新设计高效且可重复使用的微波（MW）吸收剂的概念。在生物炭复合材料中，纳米级无定形磁性颗粒以及石墨化微孔碳-铁骨架实现了强大的 MW 吸收。与源于铁相的弱磁损耗相比，具有丰富表面官能团（即 CO 和 CO）的石墨碳结构表现出较强的介电损耗，因此在 MW 再利用过程中优先作为主要活性位点。MW 吸收生物炭在温和的 MW 辐照下，无需外加化学物质、低能耗且几乎没有 Fe 溶解，快速、高效且持久地去除难处理的除草剂（2,4-二氯苯氧乙酸）。总体而言，本研究将促进碳中和工业废水处理和木材废料增值。
