【摘要】 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（NO-3、HCO-3和SO₂-4）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。更多还原

【Abstract】 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 within240 min while the removal rate of 200 mg·L-11 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(NO-3,HCO-3 and SO2-4) at different concentrations.However,humic acid has a great influence on the degradation of 1 1 1-TCA. In conclusion,PAA-b-PScovered Fe/Ni nanoparticles have selectivity and are highly effective for the degradation of 1 1 1-TCA from groundwater.更多还原