文献类型：期刊文献

英文题名：Enhanced Cr(VI) removal by using the mixture of pillared bentonite and zero-valent iron

作者：Zhang, Yuling[2,3];Li, Yimin[1];Li, Jianfa;Sheng, Guodong;Zhang, Yun[2,3];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：2012

卷号：185

起止页码：243

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：SCI-EXPANDED(收录号：WOS:000301891100028)、、EI(收录号：20120914811901)、Scopus(收录号：2-s2.0-84862811877)、WOS

基金：This work was supported by the National Natural Science Foundation of China (20977063 and 21047005).

语种：英文

外文关键词：Pillared bentonite; Zero valent iron; Removal; Hexavalent chromium

外文摘要：In this work, a novel combination of pillared bentonite (OH-Al-bent) with zero valent iron (ZVI) was studied in column experiments so as to enhance Cr(VI) removal efficiency and improve the longevity of Fe-0-based permeable reactive barriers. The influence of mixing manner, bentonite type, initial pH and OH-Al-bent amount on the removal efficiency were evaluated. The enhanced removal was attributed to the synergetic effect between adsorption by OH-Al-bent and reduction by ZVI. The adsorption facilitated the mass transfer of Cr(VI) from aqueous to iron surface, and thus accelerated the reduction of Cr(VI) by ZVI. Additionally, the higher removal efficiency was observed under lower pH, and the complete Cr(VI) removal could last longer due to the buffering effect of OH-Al-bent. XPS analysis indicated that Cr(VI) was reduced to Cr(III), and then precipitated in the forms of Cr(III) and Fe(III) hydroxides or Cr(III)-Fe(III) hydroxides. But fewer precipitations on iron surface were detected when OH-Al-bent was combined with ZVI, which might also contribute to the extended longevity of reaction medium. (c) 2012 Elsevier B.V. All rights reserved.