《Table 3–Relative content of the functional groups of used tea-leaf biochar before (UTC) and after (

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《Study of ciprofloxacin removal by biochar obtained from used tea leaves》

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The FTIR spectra were analyzed to identify the characteristic functional groups of the adsorbents.The 4000–400 cm-1infrared spectral regions of the UTC and UTCadare shown in Fig.7.Several obvious peaks can be observed in the infrared spectra of UTC.As shown in Table 2，the functional groups，including the stretching vibrations of\\OH（3400 cm-1），the C_C bond in an aromatic ring or C_C bond（1570 cm-1），C\\H alkanes（1435 cm-1）and C\\O in phenol（1167 cm-1），are clearly identified.Two other weak peaks at 2917 and2850 cm-1are related to the symmetric and asymmetric stretching vibrations of methylene（Huang et al.，2015；Malkoc and Nuhoglu，2006；Sun et al.，2016）.