文献类型：期刊文献

英文题名：Colloidal diatomite, radionickel, and humic substance interaction: a combined batch, XPS, and EXAFS investigation

作者：Sheng, Guodong[1,2];Shen, Runpu[1];Dong, Huaping[1];Li, Yimin[1]

机构：[1]Shaoxing Univ, Sch Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Chinese Acad Sci, Inst Plasma Phys, Key Lab Novel Thin Film Solar Cells, Hefei 230031, Peoples R China

年份：2013

卷号：20

期号：6

起止页码：3708

外文期刊名：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

收录：SCI-EXPANDED(收录号：WOS:000318779200020)、、Scopus(收录号：2-s2.0-84878114336)、WOS

基金：Financial supports from the National Natural Science Foundation of China (21207092; 21176156, 21177088, 20907055, 20971126 and 21077107), the Natural Science Foundation of Zhejiang Province (LY12B06003), Zhejiang Science and Technology Project (2011C31034), 973 project (2011CB933700), the Knowledge Innovation Program of CAS, and Special Foundation for High-Level Waste Disposal (2007-840) are acknowledged. The authors gratefully acknowledge Dr. Zhi Xie, Bo He, and Fengchun Hu of NSRL, USTC, for helpful technical assistance of EXAFS data collection and analysis.

语种：英文

外文关键词：Ni(II); Interaction mechanism; Microstructure; Diatomite; Humic substance

外文摘要：This work determined the influence of humic acid (HA) and fulvic acid (FA) on the interaction mechanism and microstructure of Ni(II) onto diatomite by using batch experiments, X-ray photoelectron spectroscopy (XPS), and extended X-ray absorption fine structure (EXAFS) methods. Macroscopic and spectroscopic experiments have been combined to see the evolution of the interaction mechanism and microstructure of Ni(II) in the presence of HA/FA as compared with that in the absence of HA/FA. The results indicated that the interaction of Ni(II) with diatomite presents the expected solution pH edge at 7.0, which is modified by addition of HA/FA. In the presence of HA/FA, the interaction of Ni(II) with diatomite increased below solution pH 7.0, while Ni(II) interaction decreased above solution pH 7.0. XPS analysis suggested that the enrichment of Ni(II) onto diatomite may be due to the formation of (a parts per thousand SO)(2)Ni. EXAFS results showed that binary surface complexes and ternary surface complexes of Ni(II) can be simultaneously formed in the presence of HA/FA, whereas only binary surface complexes of Ni(II) are formed in the absence of HA/FA, which contribute to the enhanced Ni(II) uptake at low pH values. The results observed in this work are important for the evaluation of Ni(II) and related radionuclide physicochemical behavior in the natural soil and water environment.