PAA-b-PS包埋纳米Fe/Ni材料的制备及其应用研究

Preparation of polyacrylic acid-b-polystyrene covered Fe/Ni nanoparticles and application

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SO42-)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-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-PScovered Fe/Ni nanoparticles have selectivity and are highly effective for the degradation of 1,1,1-TCA from groundwater.