Yunnan Provincial Key Lab of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, Yunnan, China.
Yunnan Provincial Key Lab of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, Yunnan, China; Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China.
Chemosphere. 2022 Mar;291(Pt 1):132747. doi: 10.1016/j.chemosphere.2021.132747. Epub 2021 Oct 30.
The elucidation of interactions between the dissolved black carbon (DBC) in biochar and hydrophobic organic contaminants (HOCs) is crucial for controlling the environmental behavior of HOCs. The complicated chemical structures of DBCs result in diverse interaction mechanisms between DBCs and HOCs, which were driven by different chemical structures in DBCs. In the present study, ten DBCs were extracted from rice straw and corncob biochars and their chemical structures were characterized and analyzed. The binding of phenanthrene (Phen) with DBC were studied through fluorescence quenching experiments. DBCs with low concentration (1 mg C/L) were found to complex with high amounts of Phen per unit mass. No significant difference was found in the amount of the bound Phen per unit amount of DBC when the concentration of DBC increased beyond >5 mg C/L. The dominant mechanisms involved in the binding of Phen by DBCs are speculated to be hydrophobic interactions, π-π electron donor-acceptor (EDA), and chemical partition, which was driven by the fatty carbon chain, aromatic rings, and quinone groups or ester groups, respectively. This study elucidates the interactions between DBC and Phen, which is of great significance for understanding the environmental behavior of HOCs.
阐明溶解态生物炭（DBC）与疏水性有机污染物（HOCs）之间的相互作用对于控制 HOCs 的环境行为至关重要。DBC 复杂的化学结构导致了 DBC 和 HOCs 之间不同的相互作用机制，这些机制是由 DBC 中不同的化学结构驱动的。在本研究中，从稻草和玉米芯生物炭中提取了 10 种 DBC，并对其化学结构进行了表征和分析。通过荧光猝灭实验研究了菲（Phen）与 DBC 的结合。发现低浓度（1 mg C/L）的 DBC 与单位质量的 Phen 发生大量复合。当 DBC 的浓度超过>5 mg C/L 时，单位 DBC 结合的 Phen 量没有明显差异。推测 DBC 与 Phen 结合的主要机制是疏水相互作用、π-π 电子给体-受体（EDA）和化学分配，分别由脂肪酸链、芳环和醌基或酯基驱动。这项研究阐明了 DBC 与 Phen 之间的相互作用，这对于理解 HOCs 的环境行为具有重要意义。
