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Comparative study of the adsorption of tetracycline on clay minerals with various nanostructures: allophane, halloysite, and montmorillonite

Published online by Cambridge University Press:  18 November 2024

Qiyi Ma ,
Ning Zhao ,
Shun Wang Open the ORCID record for Shun Wang [Opens in a new window] ,
Baifa Zhang ,
Mengyuan Li Open the ORCID record for Mengyuan Li [Opens in a new window] ,
Dong Liu Open the ORCID record for Dong Liu [Opens in a new window] ,
Xiang Zhou ,
Maxim Rudmin Open the ORCID record for Maxim Rudmin [Opens in a new window] ,
Antoine F. Mulaba-Bafubiandi  and
Peng Yuan Open the ORCID record for Peng Yuan [Opens in a new window]
Qiyi Ma
Affiliation:
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
Ning Zhao
Affiliation:
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
Shun Wang*
Affiliation:
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources/Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China Songshan Lake Materials Laboratory, Dongguan, 523808, China
Baifa Zhang
Affiliation:
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China
Mengyuan Li
Affiliation:
CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
Dong Liu
Affiliation:
CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
Xiang Zhou
Affiliation:
Jewelry Institute, Guangzhou Panyu Polytechnic, Guangzhou, 511483, China
Maxim Rudmin
Affiliation:
Tomsk Polytechnic University, 634050 Tomsk, Russia
Antoine F. Mulaba-Bafubiandi
Affiliation:
Mineral Processing and Technology Research Centre, Department of Metallurgy, School of Mining, Metallurgy and Chemical Engineering, Faculty of Engineering and the Built Environment, University of Johannesburg, PBOX 17011 South Africa
Peng Yuan
Affiliation:
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China
*
Corresponding author: Shun Wang; Email: [email protected]
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Abstract

With the over-use of tetracycline (TC) and its ultimate accumulation in aquatic systems, the demand for TC removal from contaminated water is increasing due to its severe threat to public health. Clay minerals have attracted great attention as low-cost adsorbents for controlling water pollution. The objective of the present study was to measure the adsorption behavior and mechanisms of TC on allophane, a nanosized clay mineral with a hollow spherical structure; to highlight the advantage of the allophane nanostructure, a further objective was to compare allophane with halloysite and montmorillonite, which have nanostructures that differ from allophane. Structural features and surface physicochemical properties were characterized by transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), zeta potential, N2-physisorption, and acid–base titration. The adsorption data showed that TC adsorption followed the pseudo-second order and Langmuir models. The adsorption was pH dependent, as all three clay minerals performed better under neutral to weakly alkaline conditions and maintained high adsorption performance in the presence of co-existing Na+/K+/Ca2+/Mg2+ cations. Regeneration of the adsorbent was excellent, with efficiencies exceeding 75% after five recycles. By comparison, allophane always exhibited the greatest adsorption capacity, up to 796 mg g–1 at ~pH 9. The TC adsorption on allophane and halloysite was dominated by inner-sphere complexation, together with a small amount of electrostatic adsorption, while that on montmorillonite involved mainly interlayer cation exchange. The findings provide insights into the effects of nanostructures of clay minerals on their TC adsorption performance and highlight the huge potential of allophane as an efficient and inexpensive adsorbent for TC removal.

Keywords

allophaneclay mineralinterfacial interactionstetracycline adsorption
Type
Original Paper
Information
Clays and Clay Minerals , Volume 72 , 2024 , e27
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Clay Minerals Society

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