• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Separation and Purification Technology >Comparative study of catalytic activity of different Fe-pillared bentonites in the presence of UV light and H2O2
【24h】

Comparative study of catalytic activity of different Fe-pillared bentonites in the presence of UV light and H2O2

机译：紫外光和过氧化氢作用下不同铁柱状膨润土催化活性的比较研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

To study the relationship of catalytic activity with Fe configuration over bentonite, three kinds of Fe-pillared bentonites were prepared by pillaring the bentonite with different Fe configurations (Fe-polycation, α-Fe2O3 and α-FeOOH). The characteristics of Fe-pillared bentonites were detected by N2 adsorption/desorption, XRF, XRD, FTIR, AFM and UV-vis. Their catalytic activities were compared by discoloration and mineralization of Orange II in the presence of UV light and H2O2. The order of catalytic activity of Fe-pillared bentonites for dye discoloration was α-Fe2O3-pillared bentonite (α-Fe2O3-P-B)>hydroxyl-Fe-pillared bentonite (H-Fe-P-B) >α-FeOOH-pillared bentonite (a-FeOOH-P-B). And that for dye mineralization was α-Fe2O3-P-B = H-Fe-P-B " α-FeOOH-P-B. A possible catalytic mechanism was proposed for surface and solution reactions to discuss the difference in their catalytic activities. The rate constants of UV-Fenton reaction decreased but the catalytic activities of Fe-pillared bentonites for H2O2 became more obvious when the UV light wavelength increased. Furthermore, the reaction activation energy of UV-Fenton reaction was 18.6 kJ mol~(-1), 20.1 kJ mol~(-1) and 23.9 kJ mol~(-1) with catalyst of H-Fe-P-B, α-Fe2O3-P-B and a-FeOOH-P-B, respectively. The results showed that both α-Fe2O3-P-B and H-Fe-P-B were promising catalysts for UV-Fenton system because of its physical and chemical stability and highly catalytic activity.
机译：为了研究膨润土上Fe构型与催化活性之间的关系，通过柱撑具有不同Fe构型的膨润土（Fe-聚阳离子，α-Fe2O3和α-FeO​​OH）制备了三种铁柱状膨润土。通过N2吸附/解吸，XRF，XRD，FTIR，AFM和UV-vis检测铁柱状膨润土的特性。通过在紫外光和H2O2存在下Orange II的变色和矿化作用比较了它们的催化活性。 Fe柱状膨润土对染料变色的催化活性顺序为α-Fe2O3柱状膨润土（α-Fe2O3-PB）>羟基-Fe柱状膨润土（H-Fe-PB）>α-FeO​​OH柱状膨润土（a -FeOOH-PB）。对于染料矿化，α-Fe2O3-PB= H-Fe-PB“α-FeO​​OH-PB。为表面和溶液反应提出了可能的催化机理，以探讨其催化活性的差异。UV-的速率常数随着紫外光波长的增加，芬顿反应减少，但铁基膨润土对H2O2的催化活性变得更明显，且紫外芬顿反应的反应活化能分别为18.6 kJ mol〜（-1），20.1 kJ mol〜（ -1）和23.9 kJ mol〜（-1）分别用H-Fe-PB，α-Fe2O3-PB和a-FeOOH-PB催化，结果表明α-Fe2O3-PB和H-Fe- PB由于其物理和化学稳定性以及高催化活性，因此是用于UV-Fenton系统的有希望的催化剂。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号