School of Resources and Environment, Northeast Agricultural University, Harbin 150030, China.
College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, China.
Bioresour Technol. 2021 Nov;340:125692. doi: 10.1016/j.biortech.2021.125692. Epub 2021 Jul 31.
Magnetic porous water hyacinth-derived biochar (MPBC) was synthesized via two-step Microwave (MW)-assisted processes. Characterization results not only testified high specific surface area (2097.50 m/g) of the MPBC assisted by MW-assisted pyrolysis, but also revealed its favorable magnetism derived from MW-assisted hydrothermal process. The MPBC possessed pH-dependent monolayer adsorption capacities of 202.61 and 202.62 mg/g for Cr(VI) and TC with quick attainments of uptake equilibrium within 150 and 200 min. Moreover, the Cr(VI) and TC uptake were substantially steady under the interference from multifarious co-existing ions with slight decline after three adsorption-desorption cycles. Furthermore, the MPBC was demonstrated to achieve excellent Cr(VI) binding primarily through complexation, electrostatic interaction, reduction and ion exchange, while presenting outstanding TC removal via pore filling, π-π stacking, hydrogen bonding force, electrostatic interaction and complexation. All these findings suggested the MPBC synthesized by MW-assisted processes as an excellent adsorbent for purification of Cr(VI) and TC-contaminated water.
磁性多孔水葫芦衍生生物炭（MPBC）通过两步微波（MW）辅助工艺合成。表征结果不仅证明了 MW 辅助热解辅助的 MPBC 具有高比表面积（2097.50 m/g），而且还揭示了其源自 MW 辅助水热过程的良好磁性。MPBC 具有 pH 值依赖性的单层吸附容量，对 Cr(VI) 和 TC 的吸附容量分别为 202.61 和 202.62 mg/g，在 150 和 200 min 内即可快速达到吸附平衡。此外，在多种共存离子的干扰下，Cr(VI) 和 TC 的吸附量基本保持稳定，经过三次吸附-解吸循环后略有下降。此外，研究表明，MPBC 对 Cr(VI) 的结合主要通过络合、静电相互作用、还原和离子交换来实现，而对 TC 的去除则主要通过孔填充、π-π 堆积、氢键、静电相互作用和络合作用来实现。所有这些发现都表明，MW 辅助工艺合成的 MPBC 是一种用于净化 Cr(VI)和 TC 污染水的优良吸附剂。
