文献类型：期刊文献

英文题名：Enhanced removal of nitrate by a novel composite: Nanoscale zero valent iron supported on pillared clay

作者：Zhang, Yun[2,3];Li, Yimin[1];Li, Jianfa;Hu, Liujiang;Zheng, Xuming[2,3]

机构：[1]Shaoxing Univ, Dept Chem, Coll Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Zhejiang Sci Tech Univ, Dept Chem, Hangzhou 310018, Zhejiang, Peoples R China;[3]Zhejiang Sci Tech Univ, State Key Lab ATMMT MOE, Hangzhou 310018, Zhejiang, Peoples R China

年份：2011

卷号：171

期号：2

起止页码：526

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：SCI-EXPANDED(收录号：WOS:000293112900019)、、EI(收录号：20112514082683)、Scopus(收录号：2-s2.0-79959297944)、WOS

基金：This work was supported by the National Science Foundation of China (Grant No. 20977063, 21047005) and by the Natural Science Foundation of Zhejiang Province, China (Grant No. Y506288).

语种：英文

外文关键词：Pillared clay; Supported; Nanoscale zero valent iron; Nitrate; Removal

外文摘要：The nanoscale zero valent iron supported on pillared clay (NZVI/PILC) was prepared, and used for nitrate removal with the objective of enhanced efficiency. The composite NZVI/PILC was characterized by transmission electron microscope (TEM), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET). Good dispersion of NZVI particles (ca. 30-70 nm) in the clay phase was observed. The removal efficiency of nitrate by this composite was investigated, and compared with commercial iron powder and NZVI containing the same amount of iron. Results showed nitrate could be completely removed by NZVI/PILC within 120 min. This efficiency was not only much higher than that (62.3%) by NZVI alone, but also superior to the sum (71.5%) of reduction by NZVI plus adsorption (9.19%) by PILC. The kinetic studies indicated that the rate of nitrate removal was positively related to the adsorption. So we suggested that the adsorption of nitrate by PILC enhanced the mass transfer of nitrate from solution to iron surface, therefore accelerated the reduction rate. The end-products of nitrate reduction by NZVI/PILC were identified as ammonium and nitrogen gas, implying NZVI/PILC may help cut down the total nitrogen amount in water. (C) 2011 Elsevier B.V. All rights reserved.