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生物炭携载纳米零价铁对溶液中Cr(VI)的去除

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薛嵩, 钱林波, 晏井春, 高卫国, 陈梦舫, 曹志强, 施维林. 生物炭携载纳米零价铁对溶液中Cr(VI)的去除[J]. 环境工程学报, 2016, 10(6): 2895-2901. doi: 10.12030/j.cjee.201501155
引用本文: 薛嵩, 钱林波, 晏井春, 高卫国, 陈梦舫, 曹志强, 施维林. 生物炭携载纳米零价铁对溶液中Cr(VI)的去除[J]. 环境工程学报, 2016, 10(6): 2895-2901. doi: 10.12030/j.cjee.201501155
shu
Xue Song, Qian Linbo, Yan Jingchun, Gao Weiguo, Chen Mengfang, Cao Zhiqiang, Shi Weinlin. Removal of Cr(VI) from aqueous using biochar carried nanoscal zero-velent iron[J]. Chinese Journal of Environmental Engineering, 2016, 10(6): 2895-2901. doi: 10.12030/j.cjee.201501155
Citation: Xue Song, Qian Linbo, Yan Jingchun, Gao Weiguo, Chen Mengfang, Cao Zhiqiang, Shi Weinlin. Removal of Cr(VI) from aqueous using biochar carried nanoscal zero-velent iron[J]. Chinese Journal of Environmental Engineering, 2016, 10(6): 2895-2901. doi: 10.12030/j.cjee.201501155
shu

生物炭携载纳米零价铁对溶液中Cr(VI)的去除

  • 1.

    苏州科技学院环境科学与工程学院, 苏州 215009

  • 2.

    中国科学院南京土壤研究所, 中国科学院土壤环境与污染修复重点实验室, 南京 210008

  • 基金项目:

    国家自然科学基金资助项目(31570515)

    江苏高校水处理技术与材料协同创新项目

    苏州市科技支撑计划项目(SS201421, SS201523)

    江苏省研究生科研创新计划项目(CXLX13_85)

  • 中图分类号: X703

Removal of Cr(VI) from aqueous using biochar carried nanoscal zero-velent iron

  • 1.

    School of Environmental Science and Engineering, Suzhou University of Sciences and Technology, Suzhou 215009, China

  • 2.

    Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China

  • Fund Project:

  • 摘要: 利用液相还原法,使生物炭携载纳米零价铁,可以有效解决纳米零价铁在水处理应用中自身团聚问题,从而提高Cr(VI)的去除效率。研究发现:在添加相同剂量纳米的条件下,当炭铁质量比为5:1时,生物炭携载纳米零价铁对溶液中Cr(VI)的去除率可达到96.8%,比纯纳米零价铁去除Cr(VI)的效率高35.9%;TEM和BET分析表明,生物炭携载纳米零价铁比纯纳米零价铁有更好的分散性和更高的比表面积,这是其去除Cr(VI)效果更好的主要原因;当溶液中Cr(VI)的反应初始浓度从25 mg/L提升至125 mg/L时,表观速率常数kobs从0.104 1 min-1降低至0.023 5 min-1,说明反应速率随着Cr(VI)初始浓度的增大而降低;当反应溶液初始pH在4.5~8.5之间时,携载纳米零价铁的生物炭对溶液中Cr(VI)的去除率均达到92.1%以上,表明生物炭携载纳米零价铁具有较广的pH适应范围,且对Cr(VI)具有较好的去除效果。
    Abstract: Novel biochar-carried nanoscale zero-valent iron (n-ZVI) particles was synthesized using liquid-phase reduction to overcome the aggregation of n-ZVI, and to effectively improve the removal rate of hexavalent chromium (Cr(VI)) in the application of water treatment. The results showed that the removal rate of Cr(VI) was up to 96.8% using the biochar-carried n-ZVI when the mass ratio of biochar to n-ZVI is 5:1; this removal rate was about 35.9% higher than that obtained using the same dose of pure n-ZVI. The results of TEM and BET analyses showed that the biochar-carried n-ZVI had higher dispersion and greater specific surface area than n-ZVI, which was the key reason for biochar-carried n-ZVI having high removal efficiency of Cr(VI). The apparent rate constant kobs decreased from 0.104 1 to 0.023 5 min-1 as the initial Cr(VI) concentration increased from 25 mg/L to 125 mg/L in the solution, indicating that the reaction rate decreases with the increased the initial concentration of Cr(VI) in the solution. The removal efficiency reached 92.1% when the solution pH increases from 4.5 to 8.5, showing that the biochar-carried n-ZVI has high Cr(VI) removal rate in a wide range of solution pH.
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  • 收稿日期:  2015-02-28
  • 刊出日期:  2016-06-03
薛嵩, 钱林波, 晏井春, 高卫国, 陈梦舫, 曹志强, 施维林. 生物炭携载纳米零价铁对溶液中Cr(VI)的去除[J]. 环境工程学报, 2016, 10(6): 2895-2901. doi: 10.12030/j.cjee.201501155
引用本文: 薛嵩, 钱林波, 晏井春, 高卫国, 陈梦舫, 曹志强, 施维林. 生物炭携载纳米零价铁对溶液中Cr(VI)的去除[J]. 环境工程学报, 2016, 10(6): 2895-2901. doi: 10.12030/j.cjee.201501155
shu
Xue Song, Qian Linbo, Yan Jingchun, Gao Weiguo, Chen Mengfang, Cao Zhiqiang, Shi Weinlin. Removal of Cr(VI) from aqueous using biochar carried nanoscal zero-velent iron[J]. Chinese Journal of Environmental Engineering, 2016, 10(6): 2895-2901. doi: 10.12030/j.cjee.201501155
Citation: Xue Song, Qian Linbo, Yan Jingchun, Gao Weiguo, Chen Mengfang, Cao Zhiqiang, Shi Weinlin. Removal of Cr(VI) from aqueous using biochar carried nanoscal zero-velent iron[J]. Chinese Journal of Environmental Engineering, 2016, 10(6): 2895-2901. doi: 10.12030/j.cjee.201501155
shu

生物炭携载纳米零价铁对溶液中Cr(VI)的去除

  • 1.  苏州科技学院环境科学与工程学院, 苏州 215009
  • 2.  中国科学院南京土壤研究所, 中国科学院土壤环境与污染修复重点实验室, 南京 210008
  • 收稿日期:  2015-02-28
基金项目:

国家自然科学基金资助项目(31570515)

江苏高校水处理技术与材料协同创新项目

苏州市科技支撑计划项目(SS201421, SS201523)

江苏省研究生科研创新计划项目(CXLX13_85)

摘要: 利用液相还原法,使生物炭携载纳米零价铁,可以有效解决纳米零价铁在水处理应用中自身团聚问题,从而提高Cr(VI)的去除效率。研究发现:在添加相同剂量纳米的条件下,当炭铁质量比为5:1时,生物炭携载纳米零价铁对溶液中Cr(VI)的去除率可达到96.8%,比纯纳米零价铁去除Cr(VI)的效率高35.9%;TEM和BET分析表明,生物炭携载纳米零价铁比纯纳米零价铁有更好的分散性和更高的比表面积,这是其去除Cr(VI)效果更好的主要原因;当溶液中Cr(VI)的反应初始浓度从25 mg/L提升至125 mg/L时,表观速率常数kobs从0.104 1 min-1降低至0.023 5 min-1,说明反应速率随着Cr(VI)初始浓度的增大而降低;当反应溶液初始pH在4.5~8.5之间时,携载纳米零价铁的生物炭对溶液中Cr(VI)的去除率均达到92.1%以上,表明生物炭携载纳米零价铁具有较广的pH适应范围,且对Cr(VI)具有较好的去除效果。

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