Insights into the facet-dependent adsorption of antibiotic ciprofloxacin on goethite
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RESEARCH ARTICLE
Insights into the facet-dependent adsorption of antibiotic ciprofloxacin on goethite Min Yang 1 & Xiaohua Ren 1 & Leixin Hu 1 & Haihong Zhou 1 & Weilin Guo 1 Received: 1 September 2020 / Accepted: 26 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Goethite is the most ubiquitous iron oxide mineral in soils, and adsorption of organic pollutants on goethite dominates the fate and transportation in the environment. In this study, the facet-dependent adsorption behavior of ciprofloxacin (CIP) on goethite was systematically investigated with in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectra and twodimensional correlation analysis (2D-COS). The experimental results indicated that the goethite samples with higher facet proportion of {021}/{110} exhibited the better adsorption capacity compared to goethite with lower facet proportion of {021}/{110}. The reason is the more existence of singly coordinated sites with higher reactivity on the {021} facet. Moreover, CIP was found to be adsorbed on {021} and {110} facets by forming a tridentate complex involving the bridge coordination of bidentate ligands, H-bonding, and a bidentate chelate complex. Keywords Goethite . Crystal facet . Ciprofloxacin . Adsorption . Mechanisms . Two-dimensional correlation analysis (2D-COS)
Introduction Adsorption and desorption by soil constituents are key processes determining transport and transformation of organic contaminants in soils (Han et al. 2013; Zhi et al. 2019). On account of the immobilization either by noncovalently bonded contacts with soil organic matter or deep embedded in the mineral lattices or multilayers, the organic pollutants could be adsorbed on soil particles effectively (Cai et al. 2019). Among them, soil minerals are considered to be important parts to govern the adsorption ability of soils, are which affected by many factors such as morphology (Adegoke et al. 2013), pH (Liu et al. 2014a, b), and specific surface area (Xue et al. 2020) in the adsorption process. Recent studies have shown that crystal facets also affect the adsorption behaviors
Responsible Editor: Tito Roberto Cadaval Jr Supplementary Information The online version contains supplementary material available at https://doi.org/10.1007/s11356-02011422-7. * Weilin Guo [email protected] 1
School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China
of environmental contaminants greatly as a crucial factor of microscopic interfaces. For example, anatase {001} facets have stronger Lewis acid sites, leading to a higher As adsorption affinity than {101} facets (Yan et al. 2016). The adsorption capacity of Orange G on lepidocrocite {010} facet was quadruple more than that on {001} facet (Qin et al. 2019). Cao et al. investigated adsorption of phenylarsonic acid (PhAs) on the hematite nanocrystals with exposed different facets and found that {012} facet was more favorable for PhAs adsorption than {001} facet (Cao et al. 2019). In recent years, a va
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