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Nano Research 2023, 16(2): 3046-3054 https://doi.org/10.1007/s12274-022-4975-1
Research Article | Issue | Published: 03 October 2022

In situ speciation analysis and kinetic study of arsenic adsorption on ferrihydrite with surface-enhanced Raman spectroscopy

Show Author's Information Lei Ouyang1,  Mingtao Wang1,  Lihua Zhu2( ),  Heqing Tang3,  Qin Shuai1( )
State Key Laboratory of Biogeology and Environmental Geology, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
College of Resources and Environmental Science, South Central University for Nationalities, Wuhan 430074, China
Keywords:
surface-enhanced Raman spectroscopy, arsenic, ferrihydrite, in situ analysis, outer-sphere complex
Topics:
Metal nanoparticlesRaman spectroscopySpectroscopic analysis
Cite this article:
Ouyang L, Wang M, Zhu L, et al. In situ speciation analysis and kinetic study of arsenic adsorption on ferrihydrite with surface-enhanced Raman spectroscopy. Nano Research, 2023, 16(2): 3046-3054. https://doi.org/10.1007/s12274-022-4975-1
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Abstract Full text Electronic supplementary material About this article

Arsenic pollution poses a serious threat to human health, and is one of the most concerning environmental problems worldwide. The adsorption, fixation, and dissolution behaviors of arsenic on the surface of iron-(hydr-) oxides influence the environmental routes of arsenic cycle geochemistry. Both inner-sphere and outer-sphere adsorption configurations of arsenic on iron oxides have been proposed based on X-ray adsorption spectra. However, there is no systematic study on the in situ speciation analysis and adsorption kinetics of these species at such interfaces, because of the lack of an efficient monitoring strategy. The correlation of surface speciation and environmental stability is still unknown. Here, a shell-isolated SiO2@Ag@Au-based surface-enhanced Raman spectroscopy (SERS) platform was developed for speciation analysis of the adsorbed arsenic species by eliminating the chemical interaction between arsenic and silver. Using ferrihydrite as a typical iron oxide, the intrinsic Raman spectra of the inner-sphere (~ 830 cm−1) and outer-sphere (~ 660 cm−1) complexes at the adsorption interface were identified. For the first time, the in situ kinetic monitoring of the formation and transformation of these species was realized. By correlating the speciation to the sequential extraction results, the environmental stability of arsenic on ferrihydrite was shown to be closely related to the adsorption configuration. It was shown that stability can be significantly promoted by transforming loosely bonded species (outer-sphere complexes) into inner-sphere structures. Our work demonstrated the applicability of SERS with shell-isolated plasmonic particles for arsenic geochemical cycle monitoring and mechanism studies. It also provided a convenient tool for developing effective strategies for arsenic pollutant control and abatement.


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About this article

In situ speciation analysis and kinetic study of arsenic adsorption on ferrihydrite with surface-enhanced Raman spectroscopy

Show Author's information Lei Ouyang1, Mingtao Wang1, Lihua Zhu2( ), Heqing Tang3, Qin Shuai1( )
State Key Laboratory of Biogeology and Environmental Geology, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
College of Resources and Environmental Science, South Central University for Nationalities, Wuhan 430074, China

Abstract

Arsenic pollution poses a serious threat to human health, and is one of the most concerning environmental problems worldwide. The adsorption, fixation, and dissolution behaviors of arsenic on the surface of iron-(hydr-) oxides influence the environmental routes of arsenic cycle geochemistry. Both inner-sphere and outer-sphere adsorption configurations of arsenic on iron oxides have been proposed based on X-ray adsorption spectra. However, there is no systematic study on the in situ speciation analysis and adsorption kinetics of these species at such interfaces, because of the lack of an efficient monitoring strategy. The correlation of surface speciation and environmental stability is still unknown. Here, a shell-isolated SiO2@Ag@Au-based surface-enhanced Raman spectroscopy (SERS) platform was developed for speciation analysis of the adsorbed arsenic species by eliminating the chemical interaction between arsenic and silver. Using ferrihydrite as a typical iron oxide, the intrinsic Raman spectra of the inner-sphere (~ 830 cm−1) and outer-sphere (~ 660 cm−1) complexes at the adsorption interface were identified. For the first time, the in situ kinetic monitoring of the formation and transformation of these species was realized. By correlating the speciation to the sequential extraction results, the environmental stability of arsenic on ferrihydrite was shown to be closely related to the adsorption configuration. It was shown that stability can be significantly promoted by transforming loosely bonded species (outer-sphere complexes) into inner-sphere structures. Our work demonstrated the applicability of SERS with shell-isolated plasmonic particles for arsenic geochemical cycle monitoring and mechanism studies. It also provided a convenient tool for developing effective strategies for arsenic pollutant control and abatement.

Keywords: surface-enhanced Raman spectroscopy, arsenic, ferrihydrite, in situ analysis, outer-sphere complex

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Publication history
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Acknowledgements

Publication history

Received: 27 June 2022
Revised: 10 August 2022
Accepted: 28 August 2022
Published: 03 October 2022
Issue date: February 2023

Copyright

© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

The authors acknowledge the funding support from the National Natural Science Foundation of China (Nos. 22106147 and 22076052), Natural Science Foundation of Hubei Province (No. 2021CFB131), China Postdoctoral Science Foundation (No. 2021M703005), and the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) (No. G1323521102).

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