合成了一种新材料聚丙烯酸-b-聚苯乙烯包埋纳米Fe/Ni颗粒（PAA-b-PS-Fe/Ni），并对1，1，1-三氯乙烷（1，1，1-TCA）的选择性脱氯效果进行了评价。由于PAA-b-PS可以防止零价铁团聚，PAA-b-PS包埋纳米Fe/Ni双金属颗粒的平均尺寸约为50 nm。在1.0 g/L Fe/Ni（Ni/Fe质量比为2%）和0.5 g/L PAA-b-PS的包埋质量浓度下，脱氯反应在240 min后达到平衡，并对200 mg/L的1，1，1-TCA的去除效率最佳（87.5%）。PAA-b-PS-Fe/Ni对1，1，1-TCA的去除效率与无机阴离子（NO₃^-、HCO₃^-和SO₄^2-）无关，去除效率均约为88%。然而，腐植酸对1，1，1-TCA的降解有很大影响。总之，PAA-b-PS包埋纳米Fe/Ni颗粒具有选择性，并且对于降解地下水中1，1，1-TCA非常有效。

Polyacrylic acid-b-polystyrene covered Fe/Ni nanoparticles (PAA-b-PS-Fe/Ni),a new material,is developed and evaluated for the selective dechlorination of 1,1,1-trichloroethane (1,1,1-TCA) in the presence of potential interferents.The sizes of PAA-b-PS coated Fe/Ni bimetallic nanoparticles are averaged approximately at 50 nm because PAA-b-PS can prevent zero-valent iron from agglomeration.The dechlorination reaction reaches balance within 240 min while the removal rate of 200 mg·L^-1 1,1,1-TCA achieves the best,87.5% under a 1.0 g·L^-1 Fe/Ni (Ni/Fe=2%) and 0.5 g·L^-1 PAA-b-PS-coated concentration.The removal efficiency of 1,1,1-TCA by PAA-b-PS-Fe/Ni is averaged at around 88%,regardless of various common inorganic anions (NO₃^-,HCO₃^- and SO₄^2-) at different concentrations.However,humic acid has a great influence on the degradation of 1,1,1-TCA.In conclusion,PAA-b-PS-covered Fe/Ni nanoparticles have selectivity and are highly effective for the degradation of 1,1,1-TCA from groundwater.

詹聪(1993-),男,硕士研究生,主要研究方向为地下水中氯代脂肪烃的去除,congzsz@163.com