Biochar (BC) has been investigated as a natural and economical activator to treat organic contamination. Compared with commercial carbon materials, BCs have a better prospect of large-scale application. For the first time, this study certified degradation of tetrachloroethene (PCE) in sulfide-containing aqueous solutions catalyzed by wormwood-based BCs pyrolyzed at 600 °C, 700 °C, and 800 °C (BC600, BC700, and BC800). Interestingly, BC800 could catalyze PCE dechlorination and form acetylene and chloride ion with over 99 % nontoxic transformation in neutral and alkaline pH conditions. Furthermore, materials surface properties, BC dosages and sulfide concentrations were considered as limiting factors for dechlorination, and the last one had the strongest influence. XPS analysis demonstrated that catalytic ability of BC was attributed to pyridine nitrogen (N6) on surface, because C and O adjacent to N6 strongly favor nucleophilic reactions. These results evaluated the applicability of degrading toxic chlorinated alkenes mediated by natural carbon materials in sulfide-containing environment.

Biochar（BC）已作为一种天然且经济的活化剂进行了研究，可以处理有机污染物。与商业碳材料相比，BCs具有大规模应用的更好前景。这项研究首次证明了在600°C，700°C和800°C（BC600，BC700和BC800）上热解的艾草基BCs催化的四氯化乙烯（PCE）在含硫化物的水溶液中的降解。有趣的是，BC800可以催化PCE脱氯并在中性和碱性pH条件下以超过99％的无毒转化率形成乙炔和氯离子。此外，材料的表面性能，BC剂量和硫化物浓度被认为是脱氯的限制因素，最后一个影响最大。XPS分析表明，BC的催化能力归因于表面的吡啶氮（N6），因为与N6相邻的C和O强烈促进亲核反应。这些结果评估了在含硫化物的环境中降解天然碳材料介导的有毒氯化烯烃的适用性。