文献类型：期刊文献

英文题名：EXAFS study of the interfacial interaction of nickel(II) on titanate nanotubes: Role of contact time, pH and humic substances

作者：Sheng, Guodong[1,3];Ye, Li[1];Li, Yimin[1];Dong, Huaping[1];Li, Hui[2];Gao, Xing[4];Huang, Yuying[4]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Shaoxing Univ, Coll Med Sci, Shaoxing 312000, Zhejiang, Peoples R China;[3]Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China;[4]Chinese Acad Sci, Shanghai Inst Appl Phys, SSRF, Shanghai 201204, Peoples R China

年份：2014

卷号：248

起止页码：71

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：SCI-EXPANDED(收录号：WOS:000337649000008)、、EI(收录号：20141517563850)、Scopus(收录号：2-s2.0-84897538191)、WOS

基金：Financial supports from the National Natural Science Foundation of China (21207092, 21177088, 11175244), China Postdoctoral Science Foundation Grant (2013M531536) and the Doctoral Scientific Research Foundation of Shaoxing University (20125038) are acknowledged. The authors thank beamline BL14W1 (Shanghai Synchrotron Radiation Facility) for providing the beam time.

语种：英文

外文关键词：Titanate nanotubes; Ni(II); Interaction; Extended X-ray absorption fine structure; spectroscopy

外文摘要：In this work, the interaction mechanism and local atomic structures of Ni(II) on titanate nanotubes (TNTs) as a function of contact time, solution pH and addition of humic acid (HA) or fulvic acid (FA) were studied mainly via the extended X-ray absorption fine structure (EXAFS) spectroscope. The results indicate that Ni(II) can be interacted with TNTs by different mechanisms, largely depending on environmental conditions. At pH 4.0 and short contact time, Ni(II) interaction with TNTs is mainly dominated by outer-sphere surface complexation. With medium increasing pH, Ni(II) interaction with TNTs tends to transform from outer-sphere surface complexes to inner-sphere surface complexes, and a mixture of inner-sphere surface complexes and surface precipitates is formed at pH 7.0 or 8.0. Besides, the interaction of Ni(II) with TNTs becomes more favorable over extended time, and EXAFS spectra analysis indicates outer-sphere surface complexes at short contact time is transformed to inner-sphere surface complexes and surface precipitates over long contact time. The addition of HA or FA enhances Ni(II) interaction with TNTs at low pH, which is attributed to the formation of "metal-bridging" (type A) and "ligand-bridging" (type B) ternary surface complexes. The results obtained are very important to understand the interaction of Ni(II) and related heavy metal ion with nano-materials such as TNTs once released into natural environment. (c) 2014 Elsevier B.V. All rights reserved.