CS-Fe和CS-Fe/Ni的制备及其用于去除钴离子

Preparation of chitosan-stabilized Fe and Fe/Ni nanoparticles for removal of Co^(2+) in water

以氯化铁为铁源,硼氢化钠为还原剂,壳聚糖为稳定剂,采用液相还原法制备壳聚糖稳定纳米铁(CS-Fe);并以氯化铁为铁源,硫酸镍为镍源,硼氢化钠为还原剂,壳聚糖为稳定剂,采用液相还原共沉淀法制备壳聚糖稳定纳米铁镍(CS-Fe/Ni)。通过SEM、EDS、XRD、FT-IR等表征手段,对所制备的CS-Fe和CS-Fe/Ni的形貌及微观结构进行表征,并以Co2+为目标去除物评价CS-Fe和CS-Fe/Ni的反应活性。初步研究表明,制成的CS-Fe含有单质纳米铁,颗粒多数以30~90nm球形颗粒为主;而CS-Fe/Ni材料中含有纳米铁镍,颗粒多数以30~60 nm球形颗粒为主;在相同的实验条件下,反应60min,CS-Fe/Ni对Co2+的去除率高达100%,但是CS-Fe仅为88%,即CS-Fe/Ni对Co2+的去除率比CS-Fe高。

Chitosan-stabilized Fe nanoparticles （CS-Fe） was prepared by chemical reduction in aqueous solution starting from ferric chloride as the raw material, sodium borohydride as reducing agent and chitosan as stabilizing agent. Chitosan-stabilized Fe/Ni nanoparticles （CS-Fe/Ni） was prepared by chemical co-precipitation reduction in aqueous solution starting from ferric chloride and nickel sulfate as the raw materials, sodium boro- hydride as reducing agent and chitosan as stabilizing agent. In addition, SEM, EDS, XRD and FT-IR were em- ployed to characterize CS-Fe and CS-Fe/Ni and the reaction activity of CS-Fe and CS-Fe/Ni was characterized u- sing Co2＋ as the model removal reaction. The results showed that most of the nano-iron in the CS-Fe is between 30 nm and 90 nm and most of the nauo-iron and Ni in the CS-Fe/Ni is between 30 nm and 60 nm. 100% of Co^2＋ was removed using CS-Fe/Ni,while only 88% was removed by CS-Fe under the same experimental condition with 60 min. Therefore,the removal efficiency of Co^2＋ by CS-Fe/Ni was higher than that by CS-Fe.