School of Resources and Environment, Northeast Agricultural University, Harbin 150030, China.
School of Resources and Environment, Northeast Agricultural University, Harbin 150030, China; Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 4888 Shengbei Rd, Changchun 130102, China.
Bioresour Technol. 2022 Sep;360:127407. doi: 10.1016/j.biortech.2022.127407. Epub 2022 Jun 3.
Herein, novel Fe-biochar composites (MBC and MBC) were synthesized through KFeO co-pyrolysis and ball milling, and were used to eliminate Cr(VI)/TC from water. Characterization results revealed that higher temperature promoted formation of zero-valent iron and FeC on MBC through carbothermal reduction between KFeO and biochar. The higher specific surface area and smaller particle size of MBC stemmed from the corrosive functions of K and the ball milling process. And the maximal uptake amount of MBC for Cr(VI)/TC was 117.49/90.31 mg/g, relatively higher than that of MBC (93.86/84.15 mg/g). Furthermore, ion exchange, pore filling, precipitation, complexation, reduction and electrostatic attraction were proved to facilitate the adsorption of Cr(VI), while hydrogen bonding force, pore filling, complexation and π-π stacking were the primary pathways to eliminate TC. This study provide a reasonable design of Fe-carbon materials for Cr(VI)/TC contained water remediation, which required neither extra modifiers nor complex preparation process.
本文通过 KFeO 共热解和球磨合成了新型 Fe-生物炭复合材料（MBC 和 MBC），并将其用于从水中去除 Cr(VI)/TC。表征结果表明，较高的温度通过 KFeO 和生物炭之间的碳热还原促进了 MBC 中零价铁和 FeC 的形成。MBC 具有更高的比表面积和更小的粒径，这归因于 K 的腐蚀性作用和球磨过程。并且，MBC 对 Cr(VI)/TC 的最大吸附量分别为 117.49/90.31 mg/g，相对高于 MBC（93.86/84.15 mg/g）。此外，离子交换、孔填充、沉淀、络合、还原和静电吸引被证明有利于 Cr(VI)的吸附，而氢键力、孔填充、络合和π-π 堆积是去除 TC 的主要途径。该研究为含 Cr(VI)/TC 的水修复提供了一种合理设计的 Fe-碳材料，既不需要额外的修饰剂，也不需要复杂的制备工艺。
