Wang Tao, Zhang Zhen, Zhang Huixue, Zhong Xiaoxiao, Liu Yonghong, Liao Shuijiao, Yue Xiali, Zhou Guangsheng
College of Science, Huazhong Agricultural University Wuhan 430070 China
Institute of Hydrobiology, Chinese Academy of Sciences Wuhan 430072 China.
RSC Adv. 2019 Dec 17;9(71):41745-41754. doi: 10.1039/c9ra06495h. eCollection 2019 Dec 13.
Due to the production and widespread application of pesticides, pesticide pollution poses a potential danger to human health and the ecosystem. Herein, activated carbons employing rape straw as a precursor were produced using HPO as an activating agent at various temperatures (300-600 °C). The activated carbons differed with respect to the physicochemical properties, which were derived from elemental analysis, N sorption-desorption, FTIR, XPS, XRD, pH, Boehm titration and blocking of the oxygen-containing groups. The oxygen-containing functional groups and the pore structure of the activated carbons obtained from the different preparation conditions were quite different. The as-prepared samples were applied as sorbents to remove carbendazim (CBD). The results indicated that the sorption of CBD was mainly dominated by partitioning at low concentrations of CBD. Meanwhile, electrostatic attractions played a more important role than hydrophobic interactions at a low initial pH; in contrast, as the initial pH increased, the hydrophobic interaction was the predominant sorption mechanism. Therefore, the results can be used to design some efficient and environmentally friendly adsorbents to reduce the risk of organic pollutants, especially organic pesticides, in aqueous solutions.
由于农药的生产和广泛应用，农药污染对人类健康和生态系统构成潜在威胁。在此，以油菜秸秆为前驱体，采用HPO作为活化剂，在不同温度（300 - 600°C）下制备了活性炭。通过元素分析、N吸附-脱附、傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）、X射线衍射（XRD）、pH值、 Boehm滴定以及含氧基团的封端等方法对活性炭的物理化学性质进行了表征，结果表明不同温度下制备的活性炭物理化学性质存在差异。不同制备条件下得到的活性炭的含氧官能团和孔结构有很大不同。将制备的样品用作吸附剂去除多菌灵（CBD）。结果表明，在低浓度CBD时，CBD的吸附主要以分配作用为主导。同时，在初始pH较低时，静电引力比疏水相互作用发挥更重要的作用；相反，随着初始pH升高，疏水相互作用成为主要的吸附机制。因此，这些结果可用于设计一些高效且环保的吸附剂，以降低水溶液中有机污染物尤其是有机农药的风险。
