通过海藻酸钠固定化制备海藻酸钠负载纳米铁镍凝胶球(SA-Fe/Ni),用于去除水体中的多氯联苯。考察了SA-Fe/Ni质量浓度、初始多氯联苯浓度、初始pH、反应温度等因素对材料去除多氯联苯的影响,同时探讨了去除反应过程中反应液总铁浓度的变化情况。结果表明,纳米铁镍材料(Fe/Ni)对4-氯联苯(4-CBP)的去除能力优于nZVI、Fe/Cu等材料。经海藻酸钠包覆后,提高了Fe/Ni的抗团聚和抗氧化能力,并且易于从反应体系中回收再利用。在最佳条件下,SA-Fe/Ni对4-CBP的去除率达到93.70%。SA-Fe/Ni在去除4-CBP的过程中,SA及Fe/Ni具有吸附还原协同作用,最终4-CBP经连续脱氯被降解为联苯。

Nano scale iron-nickel bimetallic particles are prepared and fixed with sodium alginate,and nano iron-nickel gel spheres (SA-Fe/Ni) supported by sodium alginate are prepared for removing polychlorinated biphenyls (PCBS) from water.The effects of SA-Fe/Ni dosage,initial concentration of PCBS,initial pH and reaction temperature on the removal of PCBS are observed,and the changes of total iron concentration in the reaction solution during the removal process is also discussed.It is shown that the removal ability of nano iron-nickel materials (Fe/Ni) to 4-chlorinated biphenyls (4-CBP) is superior to that of nZVI and Fe/Cu materials.The anti-agglomeration and anti-oxidation ability of Fe/Ni are improved after coated with sodium alginate,and it is easy to be recycled from the reaction system.The removal rate of 4-CBP by SA-Fe/Ni reaches 93.70% under the optimal conditions.During the process of removing 4-CBP by SA-Fe/Ni,both SA and Fe/Ni have synergistic effect of adsorption reduction,and finally 4-CBP is degraded to biphenyl.

陈仪霖(1997-),男,硕士研究生,研究方向为水处理理论与技术,chenyilin0220@163.com