The chemical structure characteristics of dissolved black carbon and their binding with phenanthrene
The chemical structure characteristics of dissolved black carbon and their binding with phenanthrene
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溶解黑碳的化学结构特征及其与菲的结合
DOI：
10.1016/j.chemosphere.2021.132747
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发表时间：
2021
期刊：
影响因子：
8.8
通讯作者：
Wu Min
中科院分区：
文献类型：
--
作者：
Chen Quan;Ma Yongji;Dong Jihong;Kong Ying;Wu Min
阐明生物炭中溶解的黑碳(DBC)与疏水有机污染物(HOCs)之间的相互作用对于控制HOCs的环境行为至关重要。DBCS复杂的化学结构导致了DBCS与HOCs之间不同的相互作用机制，这是由DBCS中不同的化学结构所驱动的。本研究从稻草和玉米芯生物炭中提取了10个DBCS，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的结合作用。低浓度(1 mg·C/L)的DBCS具有较高的单位质量phen含量。当DBC的浓度超过5 mg·C/L时，DBC与Phen的结合量没有显著差异。推测DBC与Phen结合的主要机制是疏水作用、π-π电子供体-受体作用和化学分配，分别由脂肪碳链、芳香环和苯醌或酯基驱动。这项研究阐明了DBC和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。
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.