改性凹凸棒土/纳米铁复合材料去除地下水NO-3-N的研究
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X523

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国家自然科学基金(41302204);中央级公益性科研院所基本科研业务费项目(CKSF2014029/SH)


Study of removal of nitrate nitrogen from groundwater using modified attapulgite-Fe nano composite material
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    摘要:

    采用液相还原法制备改性凹凸棒土/纳米铁复合材料(简称复合材料),考察了该复合材料的稳定性及其作用下“三氮”(NO-3-N、NH+4-N、NO-2-N)的变化情况,阐明了地下水环境因素(DO、温度、光照)对复合材料去除NO-3-N的影响。模拟地下水环境时,3种材料去除NO-3-N的反应活性顺序为:复合材料>纳米铁>改性凹凸棒土,且复合材料作用下NH+4-N的转化率低,几乎无NO-2-N生成。DO、温度对复合材料去除地下水NO-3-N的影响较大;而光照和黑暗环境下,地下水中NO-3-N的去除率及NH+4-N、NO-2-N的生成量均无明显差异。研究成果旨在为NO-3-N污染地下水工程修复提供理论依据和技术支撑。

    Abstract:

    In this study, we synthesized modified attapulgite-Fe nano composite material(A-NZVI)using the liquid-phase reduction method, and investigated the stability of A-NZVI and changes of three kinds of nitrogen(NO3--N, NH4+-N, and NO2--N)in the reaction process. We also analyzed the effects of groundwater environmental factors(dissolved oxygen, temperature, and light)on the removal of NO3--N with A-NZVI. In the simulation of groundwater environment, the three kinds of materials were ranked in the following descending order according to their reactivity in removing NO3--N: A-NZVI, nanoscale zero-valent iron, and modified attapulgite. The conversion rate of NH4+-N was low, with nearly no NO2--N generated, when using A-NZVI. Dissolved oxygen and temperature had significant influence on the removal of NO3--N from groundwater with A-NZVI. When in the light and dark environment, the removal rate of NO3--N and the amounts of generated NH4+-N and NO2--N had no significant difference. The findings of the study provided a theoretical basis and technical support for restoration projects for groundwater with NO3--N pollution.

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董磊,龚磊,林莉,等.改性凹凸棒土/纳米铁复合材料去除地下水NO-3-N的研究[J].水资源保护,2017,33(1):67-74.(DONG Lei, GONG Lei, LIN Li, et al. Study of removal of nitrate nitrogen from groundwater using modified attapulgite-Fe nano composite material[J]. Water Resources Protection,2017,33(1):67-74.(in Chinese))

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  • 收稿日期:2016-04-23
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  • 在线发布日期: 2017-01-23
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