Faculty of Modern Agricultural Engineering, Kunming University of Science & Technology, Kunming, Yunnan 650500, China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China.
Faculty of Modern Agricultural Engineering, Kunming University of Science & Technology, Kunming, Yunnan 650500, China.
Bioresour Technol. 2024 Dec;413:131547. doi: 10.1016/j.biortech.2024.131547. Epub 2024 Sep 27.
This study explores the physicochemical attributes of dissolved organic matter from rice straw biochar (BDOM) at varying pyrolysis temperatures and photo-irradiation conditions, focusing on the binding mechanisms of phenanthrene (PHE) and 9-phenanthrol (PTR) using multiple spectroscopic techniques and fluorescence quenching. Following 20 h of photo-irradiation, only 11.3 % of BDOM underwent mineralization, forming new CH/CH/CH aliphatics structures. BDOM from biochar produced by pyrolysis at 400°C exhibited a stronger binding affinity with PHE and PTR, achieving 44 % and 52 % maximum binding, respectively. Static and dynamic quenching governed PHE and PTR binding, which was influenced by temperature. Photo-irradiated BDOM showed enhanced binding with PHE, attributed to increased aliphatic content. Hydrogen bond and π-π electron-donor-acceptor (EDA) interactions dominated PTR binding, while π-π interactions and hydrophobic interactions controlled PHE. This study provides valuable insights into BDOM photochemical behaviors and their impact on the environmental fate of polycyclic aromatic hydrocarbons (PAHs) after BDOM photo-irradiation.
本研究探索了不同热解温度和光辐照条件下水稻秸秆生物炭中溶解有机质（BDOM）的物理化学特性，重点利用多种光谱技术和荧光猝灭研究了菲（PHE）和 9-菲醇（PTR）的结合机制。经过 20 小时的光辐照后，只有 11.3%的 BDOM 发生矿化，形成新的 CH/CH/CH 脂肪族结构。在 400°C 下热解产生的生物炭的 BDOM 与 PHE 和 PTR 的结合亲和力更强，最大结合率分别达到 44%和 52%。静态和动态猝灭控制着 PHE 和 PTR 的结合，这受到温度的影响。光辐照的 BDOM 与 PHE 的结合增强，这归因于脂肪族含量的增加。氢键和 π-π 电子供体-受体（EDA）相互作用主导 PTR 的结合，而 π-π 相互作用和疏水相互作用控制 PHE 的结合。本研究为 BDOM 光化学行为及其对 BDOM 光辐照后多环芳烃（PAHs）环境归宿的影响提供了有价值的见解。
