Exploring the Sorption Mechanism of Ni(II) on Illite: Batch Sorption, Modelling, EXAFS and Extraction Investigations

Abstract The sorption mechanism of nickel (Ni) at the illite/water interface was investigated using batch, sorption modelling, extended X-ray absorption fine structure (EXAFS), and extraction approaches. The results showed that Ni(II) sorption on illite was strongly dependent on pH, contact time, te...

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Main Authors: Xiaolan Zhao, Shirong Qiang, Hanyu Wu, Yunbo Yang, Dadong Shao, Linchuan Fang, Jianjun Liang, Ping Li, Qiaohui Fan
Format: Article
Language:English
Published: Nature Publishing Group 2017-08-01
Series:Scientific Reports
Online Access:https://doi.org/10.1038/s41598-017-09188-z
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spelling doaj-ce0f7b8262714110b947bb4c6c5df62d2020-12-08T00:27:26ZengNature Publishing GroupScientific Reports2045-23222017-08-017111210.1038/s41598-017-09188-zExploring the Sorption Mechanism of Ni(II) on Illite: Batch Sorption, Modelling, EXAFS and Extraction InvestigationsXiaolan Zhao0Shirong Qiang1Hanyu Wu2Yunbo Yang3Dadong Shao4Linchuan Fang5Jianjun Liang6Ping Li7Qiaohui Fan8Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of SciencesKey Laboratory of Preclinical Study for New Drugs of Gansu Province, and Institute of Physiology, School of Basic Medical Sciences, Lanzhou University, 199 Donggang West RoadKey Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of SciencesKey Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of SciencesInstitute of Plasma Physics, Chinese Academy of SciencesState Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F UniversityKey Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of SciencesKey Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of SciencesKey Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of SciencesAbstract The sorption mechanism of nickel (Ni) at the illite/water interface was investigated using batch, sorption modelling, extended X-ray absorption fine structure (EXAFS), and extraction approaches. The results showed that Ni(II) sorption on illite was strongly dependent on pH, contact time, temperature, and initial Ni(II) concentration. At a low initial Ni(II) concentration, the ion exchange species of ≡X2Ni° and the inner-sphere complexes including ≡SsONi+, ≡SwONi+ and ≡SwONiOH° species are observed on the sorption edges of Ni(II) on illite. As the initial Ni(II) concentration increased to 1.7 × 10−3 mol/L, precipitates including surface-induced precipitation of s-Ni(OH)2 and amorphous Ni(OH)2 became more significant, especially under neutral to alkaline conditions. EXAFS analysis confirmed that Ni-Al layered double hydroxide (LDH) can gradually form with an increase in the contact time. At pH 7.0, α-Ni(OH)2 was produced in the initial stage and then transformed to the more stable form of Ni-Al LDH with increasing contact time because of the increased Al3+ dissolution. With an increase in temperatures, α-Ni(OH)2 phase on illite transformed to Ni-Al LDH phase, indicating a lower thermodynamic stability compared to Ni-Al LDH phase. These results are important to understand the geochemical behaviors to effectively remediate soil contaminated with Ni(II).https://doi.org/10.1038/s41598-017-09188-z
collection DOAJ
language English
format Article
sources DOAJ
author Xiaolan Zhao
Shirong Qiang
Hanyu Wu
Yunbo Yang
Dadong Shao
Linchuan Fang
Jianjun Liang
Ping Li
Qiaohui Fan
spellingShingle Xiaolan Zhao
Shirong Qiang
Hanyu Wu
Yunbo Yang
Dadong Shao
Linchuan Fang
Jianjun Liang
Ping Li
Qiaohui Fan
Exploring the Sorption Mechanism of Ni(II) on Illite: Batch Sorption, Modelling, EXAFS and Extraction Investigations
Scientific Reports
author_facet Xiaolan Zhao
Shirong Qiang
Hanyu Wu
Yunbo Yang
Dadong Shao
Linchuan Fang
Jianjun Liang
Ping Li
Qiaohui Fan
author_sort Xiaolan Zhao
title Exploring the Sorption Mechanism of Ni(II) on Illite: Batch Sorption, Modelling, EXAFS and Extraction Investigations
title_short Exploring the Sorption Mechanism of Ni(II) on Illite: Batch Sorption, Modelling, EXAFS and Extraction Investigations
title_full Exploring the Sorption Mechanism of Ni(II) on Illite: Batch Sorption, Modelling, EXAFS and Extraction Investigations
title_fullStr Exploring the Sorption Mechanism of Ni(II) on Illite: Batch Sorption, Modelling, EXAFS and Extraction Investigations
title_full_unstemmed Exploring the Sorption Mechanism of Ni(II) on Illite: Batch Sorption, Modelling, EXAFS and Extraction Investigations
title_sort exploring the sorption mechanism of ni(ii) on illite: batch sorption, modelling, exafs and extraction investigations
publisher Nature Publishing Group
series Scientific Reports
issn 2045-2322
publishDate 2017-08-01
description Abstract The sorption mechanism of nickel (Ni) at the illite/water interface was investigated using batch, sorption modelling, extended X-ray absorption fine structure (EXAFS), and extraction approaches. The results showed that Ni(II) sorption on illite was strongly dependent on pH, contact time, temperature, and initial Ni(II) concentration. At a low initial Ni(II) concentration, the ion exchange species of ≡X2Ni° and the inner-sphere complexes including ≡SsONi+, ≡SwONi+ and ≡SwONiOH° species are observed on the sorption edges of Ni(II) on illite. As the initial Ni(II) concentration increased to 1.7 × 10−3 mol/L, precipitates including surface-induced precipitation of s-Ni(OH)2 and amorphous Ni(OH)2 became more significant, especially under neutral to alkaline conditions. EXAFS analysis confirmed that Ni-Al layered double hydroxide (LDH) can gradually form with an increase in the contact time. At pH 7.0, α-Ni(OH)2 was produced in the initial stage and then transformed to the more stable form of Ni-Al LDH with increasing contact time because of the increased Al3+ dissolution. With an increase in temperatures, α-Ni(OH)2 phase on illite transformed to Ni-Al LDH phase, indicating a lower thermodynamic stability compared to Ni-Al LDH phase. These results are important to understand the geochemical behaviors to effectively remediate soil contaminated with Ni(II).
url https://doi.org/10.1038/s41598-017-09188-z
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