Key Laboratory of Sustainable Utilization of Technology Research for Fishery Resource of Zhejiang Province, Zhejiang Marine Fisheries Research Institute, Zhoushan, 316021, Zhejiang, People's Republic of China.
Marine and Fishery Institute, Zhejiang Ocean University, Zhoushan, 316021, People's Republic of China.
Sci Rep. 2021 Jan 19;11(1):1797. doi: 10.1038/s41598-021-81314-4.
The influences of water washing treatment on the properties of Ulva prolifera-derived biochar (U.P-biochar) and its sorption characteristics of ofloxacin (OFL) were investigated. The results showed that the water washing treatment significantly changed the physiochemical structures of U.P-biochars, and improved the sorption capacity of OFL. The sorption capacity of OFL by U.P-biochar was closely dependent on pyrolysis temperature (200-600 °C) and equilibrium solution pH (3-11). Different sorption mechanisms (e.g. cation exchange, electrostatic attraction, H-bond and cationic-π and π-π interactions) were dominant for specific U.P-biochars under various pH regions (acidic, neutral and alkaline). Moreover, the unwashed and washed U.P-biochars prepared at 200 °C (BC200 and BCW200) showed a higher sorption capacity of OFL at pH = 7. The two-compartment first-order model provided an appropriate description of the sorption kinetics of OFL by BC200 and BCW200 (R > 0.98), which revealed that the contribution ratios between the fast and slow sorption compartments (f/f, 1.55 for BC200 and 1.25 for BCW200) reduced after water washing treatment of U.P-biochar. The values of n for the Freundlich model were less than 1, which demonstrated that the sorption of OFL by BC200 and BCW200 was favourable and nonlinear. Also, the sorption of OFL by BC200 and BCW200 increased with an increase in solution temperature and the sorption process was spontaneous and endothermic. This study provides valuable information for being a primary consideration in the production and application of U.P-biochar.
研究了水洗处理对浒苔衍生生物炭（U.P-生物炭）性质及其对氧氟沙星（OFL）吸附特性的影响。结果表明，水洗处理显著改变了 U.P-生物炭的物理化学结构，并提高了 OFL 的吸附能力。U.P-生物炭对 OFL 的吸附能力与热解温度（200-600°C）和平衡溶液 pH（3-11）密切相关。在不同 pH 区域（酸性、中性和碱性）下，不同的吸附机制（如阳离子交换、静电吸引、氢键和阳离子-π 和 π-π 相互作用）对特定的 U.P-生物炭起主导作用。此外，在 pH=7 时，未水洗和 200°C 下制备的水洗 U.P-生物炭（BC200 和 BCW200）对 OFL 表现出更高的吸附能力。两室一级模型对 BC200 和 BCW200 吸附 OFL 的动力学过程进行了很好的描述（R>0.98），表明水洗处理后，BC200 和 BCW200 中快速和慢速吸附相的贡献比（f/f，BC200 为 1.55，BCW200 为 1.25）降低。Freundlich 模型的 n 值小于 1，表明 OFL 与 BC200 和 BCW200 的吸附是有利的和非线性的。此外，BC200 和 BCW200 对 OFL 的吸附随溶液温度的升高而增加，吸附过程是自发的和吸热的。本研究为浒苔生物炭的生产和应用提供了有价值的信息。
