中文摘要：

为探求土壤及沉积物中六氯苯去除的高效且经济可行方法，以金属锌粉为还原剂，开展了六氯苯机械化学还原脱氯研究。具体考察了球磨转速、锌／氯摩尔比等因素对脱氯效果的影响，用气相色谱-质谱联用、X-射线衍射、红外光谱等检测手段对脱氯产物进行了表徵。结果发现，以金属锌粉作还原剂，六氯苯机械化学还原脱氯效果很好。六氯苯机械化学还原脱氯效果主要受球磨转速与Zn／Cl摩尔比影响，转速与Zn／Cl摩尔比越高，脱氯效果越好。在转速550rpm，Zn／Cl摩尔比12：1，球磨8h条件下，六氯苯完全脱氯，转化为无定形碳，极小部分转化为脂肪酸。六氯苯机械化学还原脱氯主要遵循自由基反应机理，在脱氯同时，发生苯环的平面、空间聚合，形成无定形碳，另外，小部分发生氧化反应，开环形成脂肪酸。

英文摘要：

Zinc powder used as reductive agent, mechano-chemical dechlorination of hexachlorobenzen was studied. The effect of rotational speed of ball milling and molar ratio of Zn/CI on the efficiency of dechlorination was investigated, and the products of dechlorinated HCB were characterized by GC-MS, XRD and IR spetrum. The results indicated that, the C1 can be effectively removed from HCB by mechano-chemical process, in which zinc powder was used as reductive agent. The dechlorinating reaction can be enhanced by the increasing rotational speed of ball milling and Zn/CI molar ratio. In the condition of rotational speed 550rpm, Zn/C1 12：1, and milling time 8h, the CI in hexachlorobenzen was almost completely removed. The hexachlorobenzen was transformed into amorphous carbon according as the radical mechanism through the pathway of benzene ring polymerized in the direction of plane and space, besides, a slight part of HCB was transformed into fatty acid in the way of oxidation and opening of benzene ring.