Li Ruining, Wang Zhaowei, Guo Jialei, Li Yan, Zhang Hanyu, Zhu Junmin, Xie Xiaoyun
Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China E-mail:
Water Sci Technol. 2018 Feb;77(3-4):1127-1136. doi: 10.2166/wst.2017.636.
Potato stems and leaves biochar (PB) was prepared by pyrolysis at a temperature of 500°C under anoxic conditions. In order to strengthen the adsorption capacity, biochar was modified with alkaline solution (alkali modified biochar, APB). Two kinds of biochars were adopted as adsorbents to remove ciprofloxacin (CIP) from aqueous solution. The adsorption behavior of CIP onto biochar before and after alkali modified including adsorption kinetics and isotherms were investigated. The effects of different factors (equilibrium time, pH, temperature and initial concentration) during the adsorption process were also investigated. Biochar samples were characterized by Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and nitrogen adsorption-desorption isotherm. The results showed that the alkali treated biochar possessed more mesopores than raw biochar, and accordingly exhibited a more excellent adsorption performance (23.36 mg·g) than raw biochar. Hydrophobic interaction, hydrogen-bonding interaction, electrostatic interaction, and π - π interaction were the adsorption mechanisms for CIP uptake onto the two adsorbents.
马铃薯茎叶生物炭（PB）是在缺氧条件下于500°C温度下通过热解制备的。为了增强吸附能力，用碱性溶液对生物炭进行改性（碱改性生物炭，APB）。采用两种生物炭作为吸附剂从水溶液中去除环丙沙星（CIP）。研究了碱改性前后CIP在生物炭上的吸附行为，包括吸附动力学和等温线。还研究了吸附过程中不同因素（平衡时间、pH值、温度和初始浓度）的影响。通过傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和氮吸附-脱附等温线对生物炭样品进行了表征。结果表明，碱处理后的生物炭比原始生物炭具有更多中孔，因此表现出比原始生物炭更优异的吸附性能（23.36 mg·g）。疏水相互作用、氢键相互作用、静电相互作用和π-π相互作用是两种吸附剂对CIP吸附的机制。
