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海藻酸钠微胶囊负载纳米铁吸附水中的As(Ⅴ)

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韩东, 鲁婷婷, 叶长城, 罗斯. 海藻酸钠微胶囊负载纳米铁吸附水中的As(Ⅴ)[J]. 环境工程学报, 2015, 9(8): 3795-3802. doi: 10.12030/j.cjee.20150834
引用本文: 韩东, 鲁婷婷, 叶长城, 罗斯. 海藻酸钠微胶囊负载纳米铁吸附水中的As(Ⅴ)[J]. 环境工程学报, 2015, 9(8): 3795-3802. doi: 10.12030/j.cjee.20150834
shu
Han Dong, Lu Tingting, Ye Changcheng, Luo Si. Removal of As(V) from aqueous solution by nanoscale zero-valent iron immobilized in alginate microcapsules[J]. Chinese Journal of Environmental Engineering, 2015, 9(8): 3795-3802. doi: 10.12030/j.cjee.20150834
Citation: Han Dong, Lu Tingting, Ye Changcheng, Luo Si. Removal of As(V) from aqueous solution by nanoscale zero-valent iron immobilized in alginate microcapsules[J]. Chinese Journal of Environmental Engineering, 2015, 9(8): 3795-3802. doi: 10.12030/j.cjee.20150834
shu

海藻酸钠微胶囊负载纳米铁吸附水中的As(Ⅴ)

  • 1.

    湖南农业大学资源环境学院, 长沙 410128

  • 基金项目:

    湖南省自然科学基金资助项目(13JJ4069)

    湖南农业大学引进人才基金项目(12YJ12)

  • 中图分类号: X703.1

Removal of As(V) from aqueous solution by nanoscale zero-valent iron immobilized in alginate microcapsules

  • 1.

    College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China

  • Fund Project:

  • 摘要: 利用本实验所制备的海藻酸钠微胶囊负载纳米零价铁材料(M-NZVI)对水中不同浓度的As(V)进行了吸附去除研究,并比较了不同材料的吸附等温曲线。实验结果表明,2 g/L M-NZVI在pH=6.5±0.1,常温常压条件下对5 mg/L的As(V)的吸附去除率为90.35%,吸附速率较快,在30 min即可达到吸附平衡。通过M-NZVI、Ca-ALG和NZVI的热力学对比实验可知,M-NZVI表现出优越的吸附性能。溶液吸附剂添加量、初始pH值、离子浓度等因素对M-NZVI吸附水中砷离子的效率有一定影响:在其他条件不变的情况下,As(V)的去除率随着添加量的增加而逐渐增大;M-NZVI对As(V)的最佳吸附效果在pH=6~7范围之间;溶液中高浓度NaCl能对M-NZVI的吸附性产生较强的干扰。同时,对于As(V) ≤ 5 mg/L的溶液,M-NZVI可以不做任何处理多次利用3~4次。这些结果显示,M-NZVI是一种用于原位修复重金属污染水体的潜在理想材料。
    Abstract: The synthesized alginate microcapsules immobilized nanoscale zero-valent iron (M-NZVI) were used to remove As(V) contained in the aqueous solution at various concentrations. Kinetics study revealed that the adsorption of As(V) by M-NZVI was fast and the equilibrium was reached within 30 min. When 2 g/L of M-NZVI was introduced into 5 mg/L of As(V) solution at pH 6.5, 90.35% of As(V) were removed from the system. It is indicated that adsorption capability of M-NZVI for As(V) was greatly improved as compared to the NZVI and Ca-alginate. The effects of the initial pH of the solution, M-ZNVI dosage and ionic strength on the removal efficiency of As(V) were also discussed. Under identical conditions, the removal of As(V) enhanced with the increasing M-NZVI dosage, but reduced remarkably by the present of high concentration of NaCl. The optimal pH range was determined to be 6~7. Furthermore, M-NZVI could be reused about 3~4 times when dose of 2 g/L loading in the removal of As(V) from aqueous solutions having concentrations of ≤ 5 mg/L. These results suggested that M-NZVI may be a potential material for in situ remediation of metal contaminated water.
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  • 收稿日期:  2014-09-18
  • 刊出日期:  2015-08-13
韩东, 鲁婷婷, 叶长城, 罗斯. 海藻酸钠微胶囊负载纳米铁吸附水中的As(Ⅴ)[J]. 环境工程学报, 2015, 9(8): 3795-3802. doi: 10.12030/j.cjee.20150834
引用本文: 韩东, 鲁婷婷, 叶长城, 罗斯. 海藻酸钠微胶囊负载纳米铁吸附水中的As(Ⅴ)[J]. 环境工程学报, 2015, 9(8): 3795-3802. doi: 10.12030/j.cjee.20150834
shu
Han Dong, Lu Tingting, Ye Changcheng, Luo Si. Removal of As(V) from aqueous solution by nanoscale zero-valent iron immobilized in alginate microcapsules[J]. Chinese Journal of Environmental Engineering, 2015, 9(8): 3795-3802. doi: 10.12030/j.cjee.20150834
Citation: Han Dong, Lu Tingting, Ye Changcheng, Luo Si. Removal of As(V) from aqueous solution by nanoscale zero-valent iron immobilized in alginate microcapsules[J]. Chinese Journal of Environmental Engineering, 2015, 9(8): 3795-3802. doi: 10.12030/j.cjee.20150834
shu

海藻酸钠微胶囊负载纳米铁吸附水中的As(Ⅴ)

  • 1. 湖南农业大学资源环境学院, 长沙 410128
  • 收稿日期:  2014-09-18
基金项目:

湖南省自然科学基金资助项目(13JJ4069)

湖南农业大学引进人才基金项目(12YJ12)

摘要: 利用本实验所制备的海藻酸钠微胶囊负载纳米零价铁材料(M-NZVI)对水中不同浓度的As(V)进行了吸附去除研究,并比较了不同材料的吸附等温曲线。实验结果表明,2 g/L M-NZVI在pH=6.5±0.1,常温常压条件下对5 mg/L的As(V)的吸附去除率为90.35%,吸附速率较快,在30 min即可达到吸附平衡。通过M-NZVI、Ca-ALG和NZVI的热力学对比实验可知,M-NZVI表现出优越的吸附性能。溶液吸附剂添加量、初始pH值、离子浓度等因素对M-NZVI吸附水中砷离子的效率有一定影响:在其他条件不变的情况下,As(V)的去除率随着添加量的增加而逐渐增大;M-NZVI对As(V)的最佳吸附效果在pH=6~7范围之间;溶液中高浓度NaCl能对M-NZVI的吸附性产生较强的干扰。同时,对于As(V) ≤ 5 mg/L的溶液,M-NZVI可以不做任何处理多次利用3~4次。这些结果显示,M-NZVI是一种用于原位修复重金属污染水体的潜在理想材料。

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