Polycyclic aromatic hydrocarbons (PAHs) are critical environmental concerns due to their intrinsic toxic aromatic nature and concomitant circumstances that potentially harm the ecological and human health. In this study, converting mahogany ( King) pericarps to value-added biochar by pyrolysis for evaluating the potential formation/destruction of biochar-bound PAHs was studied for the first time. This study designed and optimized the thermal processing conditions at 300–900 °C in the CO or N atmosphere, and heteroatoms (N, O, B, NB, and NS) were modified for mahogany pericarps biochar (MPBC) production. The MPBC500 exhibited significantly higher pyrolysis products of PAHs (2780 ± 38 ng g) than that of MPBC900 (78 ± 6 ng g) under N without introducing modified elements. Specifically, the inhibition capacity of MPBC500 for PAHs under CO was improved most efficiently by the active nitrogen species of the pyridinic N and pyrrolic N groups. The pyrolysis conditions and heteroatom modification of MPBC altered its physicochemical properties, that is, aromaticity and hydrophobicity, affecting the PAH concentration and composition in the pyrolysis products. This study reveals sustainable approaches to reduce the environmental footprint of biochar by focusing on increases in PAHs pollution in sustainable biochar produced from a low-carbon bioeconomy perspective.

中文翻译：

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利用桃花心木（Swietenia macrophylla King）果皮进行简便的杂原子改性生物炭生产，以增强对多环芳烃污染物的抑制


多环芳烃 (PAH) 因其固有的有毒芳香性质以及可能危害生态和人类健康的伴随环境而成为严重的环境问题。在本研究中，首次研究了通过热解将桃花心木（King）果皮转化为增值生物炭，以评估生物炭结合多环芳烃的潜在形成/破坏。本研究设计并优化了 CO 或 N 气氛中 300–900 °C 的热处理条件，并对杂原子（N、O、B、NB 和 NS）进行了修改，用于红木果皮生物炭（MPBC）的生产。在不引入改性元素的情况下，在 N 条件下，MPBC500 表现出的 PAH 热解产物 (2780 ± 38 ng g) 明显高于 MPBC900 (78 ± 6 ng g)。具体而言，MPBC500 在 CO 下对 PAH 的抑制能力通过吡啶 N 和吡咯 N 基团的活性氮物种得到最有效的提高。 MPBC的热解条件和杂原子修饰改变了其物理化学性质，即芳香性和疏水性，影响热解产物中PAH的浓度和组成。这项研究通过关注从低碳生物经济角度生产的可持续生物炭中多环芳烃污染的增加，揭示了减少生物炭环境足迹的可持续方法。