| 羟基铝柱撑膨润土负载纳米铁还原Cr(Ⅵ) |
| 摘要点击 3145 全文点击 2132 投稿时间：2008-05-07 修订日期：2008-07-22 |
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| 中文关键词 负载纳米铁 羟基铝柱撑膨润土 Cr(Ⅵ) 还原 协同作用 |
| 英文关键词 supported nanoscale zero-valent iron Al-pillared bentonite chromium(Ⅵ) reduction synergetic effect |
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| 中文摘要 |
| 用具有良好吸附能力的羟基铝柱撑膨润土作载体，通过FeSO4与NaBH4反应制得羟基铝柱撑膨润土负载的纳米铁(nanoscale zero-valent iron supported on Al-pillared bentonite,NZVI/Al-PILC).用X射线衍射(X-ray diffraction, XRD)、(Brunauer-Emmett-Teller,BET)法对NZVI/Al-PILC进行了结构表征.以Cr(Ⅵ)为目标污染物,考察了NZVI/Al-PILC与Cr(Ⅵ)反应过程中，介质pH、不同起始浓度的Cr(Ⅵ)对其去除率的影响，并与相同铁含量的纳米铁(nanoscale zero-valent iron，NZVI)进行了比较.结果表明，在相同实验条件下，Cr(Ⅵ)与NZVI/Al-PILC反应120 min后去除率接近100%，不仅高于相同铁含量NZVI对Cr(Ⅵ)去除率(63.0%)，而且也明显优于相同铁含量的NZVI和相同含土量的羟基铝柱撑膨润土对Cr(Ⅵ)去除率的加和(75.4%). |
| 英文摘要 |
| In the presence of Al-pillared bentonite with good sorption capacity, nanoscale zero-valent iron supported on Al-pillared bentonite (NZVI/Al-PILC) was prepared with NaBH4 and FeSO4 aqueous solution. The structure of NZVI/Al-PILC was characterized by X-ray diffraction(XRD) and Brunauer-Emmett-Teller (BET). The effects of pH values and initial chromium(Ⅵ) concentrations on its removal rate by NZVI/Al-PILC were investigated, and were compared with those of unsupported nanoscale zero-valent iron (NZVI) containing the same iron mount of NZVI/Al-PILC. The results indicate that in the same experimental condition, the chromium(Ⅵ) removal by NZVI/Al-PILC reached 100% after 120 min. The removal is not only much higher than that (63.0%) of the NZVI containing same iron mount, but also superior to the sum of removal (75.4%) by NZVI containing the same iron amount and the Al-pillared bentonite containing the same clay amount with NZVI/Al-PILC. |
