Effect of bimetallic and polymer-coated Fe nanoparticles on biological denitrification
Effect of bimetallic and polymer-coated Fe nanoparticles on biological denitrification
复制标题
双金属和聚合物涂层纳米铁对生物反硝化的影响
DOI：
10.1016/j.biortech.2010.07.110
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发表时间：
2010-12-01
影响因子：
11.4
通讯作者：
Wang, Xue
中科院分区：
文献类型：
--
作者：
An, Yi;Li, Tielong;Wang, Xue
采用双金属纳米粒子（纳米Fe-Ni、纳米Fe-Cu）和包覆铁纳米粒子（壳聚糖-Fe-0、油酸钠-Fe-0）支持自养反硝化。与纳米级零价铁（NZVI）颗粒相比，含镍纳米颗粒的硝酸盐去除速度更快，但产生的铵多17%。纳米Fe-Cu一体化系统比未改性的NZVI一体化系统少需要两天的时间来去除所有的硝酸盐和降低13%的铵，但大量的亚硝酸盐仍留在系统中。与未涂覆的NZVI颗粒相比，壳聚糖涂覆的纳米颗粒允许相同的硝酸盐去除时间，但铵产量增加23%。油酸钠-Fe-0纳米颗粒不仅使铵的生成减少了17%，而且还降低了纳米颗粒对细菌的毒性。因此，油酸钠-Fe-0纳米颗粒可能是NZVI颗粒的适当替代物，以支持自养反硝化作用，前提是允许额外的时间（两天）用于完全去除硝酸盐。(c)2010爱思唯尔有限公司保留所有权利。
Bimetallic nanoparticles (nano Fe-Ni, nano Fe-Cu) and coated iron nanoparticles (chitosan-Fe-0, sodium oleate-Fe-0) were utilized to support autotrophic denitrification. In comparison to nanoscale zero-valent iron (NZVI) particles, Ni-containing nanoparticles resulted in faster nitrate removal, but generated 17% more ammonium. The nano Fe-Cu integrated system, required two days less than the unmodified NZVI integrated system to remove all the nitrate and decrease ammonium by 13%, but a large amount of nitrite remained in the system. Compared to uncoated NZVI particles, chitosan-coated nanoparticles allowed the same nitrate removal time but 23% more ammonium production. The sodium oleate-Fe-0 nanoparticles did not only decrease the generation of ammonium by 17%, but also reduced the toxicity of the nanoparticles to bacteria. Therefore, sodium oleate-Fe-0 nanoparticles may be an appropriate substitute for NZVI particles to support autotrophic denitrification provided that additional time (two days) is allowed for complete nitrate removal. (c) 2010 Elsevier Ltd. All rights reserved.