Characterization of the biochar-derived dissolved organic matter (BDOM) is essential to understanding the environmental efficacy of biochar and the behavior of heavy metals. In this study, the binding properties of BDOM derived from different pyrolysis temperatures, wetland plants, and plant organs with Cu was investigated based on a multi-analytical approach. In general, the pyrolysis temperature exhibited a more significant impact on both the spectral characteristics of BDOM and Cu binding behavior than those of the feedstocks. With the pyrolysis temperature increased, the dissolved organic carbon, aromaticity, and fluorescence substance of BDOM decreased and the structure became more condensed. Humic-and tryptophan-like substance was more susceptible to the addition of Cu for BDOM pyrolyzed at 300 ℃ and 500 ℃, respectively. In addition, the more tyrosine-like substance is involved in Cu binding at higher pyrolysis temperature (500 ℃). However, the fluvic-like substance occurred preferentially with Cu than the other fluorophores. Moreover, the higher binding capacity for Cu was exhibited by the humic-like substance and by BDOM derived from the higher pyrolysis temperature and the lower elevation plants with the corresponding average stability constants (log K_M) of 5.58, 5.36, and 5.16.

生物炭衍生的溶解有机物 (BDOM) 的表征对于了解生物炭的环境功效和重金属的行为至关重要。在这项研究中，基于多分析方法研究了来自不同热解温度、湿地植物和植物器官的 BDOM 与 Cu 的结合特性。一般来说，热解温度对 BDOM 的光谱特征和铜结合行为的影响比对原料的影响更显着。随着热解温度的升高，BDOM的溶解有机碳、芳香性和荧光物质减少，结构更加凝缩。腐殖酸类物质和类色氨酸物质对添加Cu的BDOM分别在300 ℃和500 ℃热解更敏感。此外，在较高的热解温度（500 ℃）下，更多的类酪氨酸物质参与了铜的结合。然而，与其他荧光团相比，Cu 优先出现类流质物质。此外，腐殖质类物质和由较高热解温度和较低海拔植物衍生的 BDOM 表现出较高的对 Cu 的结合能力，具有相应的平均稳定性常数 (logK _M ) 为 5.58、5.36 和 5.16。