Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China; College of Science, China Agricultural University, Beijing, 100193, China.
Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China.
Chemosphere. 2019 Nov;235:918-925. doi: 10.1016/j.chemosphere.2019.06.158. Epub 2019 Jun 21.
Biochar is an adsorbent widely used to remove contaminants from polluted water. A series of biochar from corn straw, corncob and corn starch was prepared through one-step pyrolysis. The biochar was characterized, and the capacity for triazine pesticide (TRZ) removal from water was compared. P doped biochar from corn straw (CSWP) was able to remove six TRZs (>96%) from water after shaking five times. The removal was more rapid than that by four other commonly used adsorbents. The physicochemical properties of CSWP were characterized systematically, and carboxyl and metaphosphates on CSWP were found to provide adsorption sites. The experimental data were best fitted by a pseudo-second-order kinetic model and the Freundlich model. Adsorption equilibrium of atrazine on CSWP occurred within 20 min, and the maximum adsorption capacity reached up to 79.6 mg g at 25 °C. The adsorption mechanism of CSWP for atrazine includes Van der Waals' forces, hydrogen bonding, electrostatic interactions and pore filling. CSWP can be reused at least five times and shows strong potential as a candidate for the rapid and efficient removal of TRZs.
生物炭是一种广泛用于去除受污染水中污染物的吸附剂。通过一步热解法制备了一系列来自玉米秸秆、玉米芯和玉米淀粉的生物炭。对生物炭进行了表征，并比较了其从水中去除三嗪类农药（TRZ）的能力。经过五次摇晃后，来自玉米秸秆的磷掺杂生物炭（CSWP）能够去除水中的六种 TRZ（>96%）。其去除速度比其他四种常用吸附剂更快。系统地表征了 CSWP 的物理化学性质，发现 CSWP 上的羧基和偏磷酸盐提供了吸附位点。实验数据最好通过拟二级动力学模型和 Freundlich 模型拟合。在 25°C 下，CSWP 对莠去津的吸附平衡在 20 min 内发生，最大吸附容量高达 79.6 mg·g-1。CSWP 对莠去津的吸附机制包括范德华力、氢键、静电相互作用和孔填充。CSWP 至少可以重复使用五次，作为快速高效去除 TRZ 的候选材料具有很强的潜力。
