Chloroform is an harmful chlorinated hydrocarbon which is hardly degraded using actual dechlorination methods. Alternatively, carboxymethyl cellulose/zero-valent iron appears promising to degrade chlorinated hydrocarbons in water, yet actually carboxymethyl cellulose cannot inhibit the oxidation and sedimentation of iron ions under alkaline condition. Here, polyethylene glycol, a green and low-cost non-ionic polymer, was used as a stabilizer to synthesize polyethylene glycol-stabilized Fe/Ni nanoparticles (PEG-Fe/Ni) for removing chloroform from water in a wide range of pH, from 3 to 11. PEG-Fe/Ni was prepared by a stepwise liquid-phase chemical reduction, then added into groundwater to remove chloroform. Results show that polyethylene glycol can both reduce the particle size from 106.9 to 79.6 nm and prevent the oxidation and sedimentation of iron ions under alkaline condition. The removal efficiency of chloroform increased from 86.3 to 100% at pH 6 in the presence of polyethylene glycol, and slightly decreased to 95.4% at pH 11. The calculated rate constant (k) indicates that chloroform removal follows pseudo-first-order kinetics. Furthermore, the PEG-Fe/Ni also removed chloroform from real groundwater at pH 8 with an efficiency of 90.1% in 4 h, which is higher than that for Fe/Ni nanoparticles, of 41.7%.

氯仿是一种有害的氯代烃，使用实际的脱氯方法很难降解。另外，羧甲基纤维素/零价铁似乎有望降解水中的氯代烃，但实际上，羧甲基纤维素不能在碱性条件下抑制铁离子的氧化和沉淀。在这里，绿色环保且低成本的非离子聚合物聚乙二醇被用作稳定剂，以合成聚乙二醇稳定的Fe / Ni纳米颗粒（PEG-Fe / Ni），以从宽范围的pH值中去除水中的氯仿，从3到11。通过逐步液相化学还原制备PEG-Fe / Ni，然后将其添加到地下水中以除去氯仿。结果表明，聚乙二醇均可将粒径从106.9降低至79。6 nm并防止碱性条件下铁离子的氧化和沉淀。在存在聚乙二醇的条件下，pH值为6时，氯仿的去除效率从86.3％提高到100％，在pH值为11时，去除效果略有下降至95.4％。k）表示氯仿的去除遵循拟一级动力学。此外，PEG-Fe / Ni还可以在4 h内从pH为8的真实地下水中去除氯仿，效率为90.1％，高于Fe / Ni纳米颗粒的41.7％。