期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 269, 期 -, 页码 874-881出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2018.08.051
关键词
Ciprofloxacin; Adsorption; Tourmaline; Halloysite; Biotite; Micro-structure
资金
- National Natural Science Foundation of China [21477135]
- Gansu Provincial Natural Science Foundation of China [17JR5RA205]
- Fundamental Research Funds for the Central Universities [lzujbky-2017-209]
The extensive use of fluoroquinolones (FQs) antibiotics has resulted in their prevalence and subsequent antibiotic resistance, and then FQs have received increasing attention as one of the major contaminants in the environment. In present study, three minerals with different micro-structures including tourmaline (cyclosilicate), halloysite (silicate nanotubes) and biotite (sheet silicate) were utilized to remove ciprofloxacin (Cip), a second generation of FQs. Three adsorbents were firstly well characterized to reveal their micro-structures and compositions by combination of scanning electron microscopic (SEM) and transmission electron microscope (TEM) technologies, X-ray diffraction (XRD), X-ray fluorescence (XRF) microscope and Brunauer-Emmett-Teller (BET) analysis, and subsequently, a systematical investigation was performed to study their adsorption performance to Cip, by varying the initial pH (2.0-10.0), contact time (0-300 min), initial concentration (0-50 mu g/mL), ion strength (1 mM and 10 mM NaCl/CaCl2). Finally, the desorption and reusability properties were evaluated. The experimental results indicate that compared with cyclosilicate tourmaline and sheet silicate biotite, the nanotube structured halloysite shows the highest adsorption ability, with the saturated adsorption capacity of 21.7 mg/g for Cip at the equilibrium time of 60 min. The presence of monovalent Na+ will promote the adsorption, while divalent Ca2+ will inhibit the adsorption, in particular with high-level concentration. The adsorbed Cip can be efficiently desorbed by 0.1 M NaOH, and the regenerated adsorbent can be used for another adsorption, with the re-sorption percentage of >80% after four cycles. (C) 2018 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据