Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan.
Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, 84 Gong-Juan Rd., Taishan, New Taipei 243, Taiwan.
Bioresour Technol. 2023 Jan;367:128303. doi: 10.1016/j.biortech.2022.128303. Epub 2022 Nov 9.
Biochar is an eco-friendly, low-cost, and carbon-rich material. This study synthesized the biochars from three agricultural wastes, pinecone, white popinac, and sugarcane bagasse, and then modified them by manganese ferrite (MnFeO) co-precipitation. These biochars were applied as adsorbents for the removal of Cu(II) ions from water. All three different MnFeO-biochars have similar adsorption performances: rapid adsorption kinetics with equilibrium being reached within 5 hr of contact and significantly enhanced adsorption capacities of Cu(II) ions from water. The principal adsorption mechanisms were identified as complexation reactions, contributed by the carboxyl and hydroxyl groups by pristine biochars and by the Mn-O and Fe-O groups for all three MnFeO-biochars. The MnFeO-biochars can be reused for three cycles, with the maximum adsorption capacities of Cu(II) of the regenerated biochars declining with the loss of precipitated MnFeO.
生物炭是一种环保、低成本、富碳的材料。本研究从三种农业废弃物（松果、白杨和甘蔗渣）中合成了生物炭，然后通过锰铁氧体（MnFeO）共沉淀对其进行了改性。这些生物炭被用作从水中去除 Cu(II)离子的吸附剂。三种不同的 MnFeO-生物炭具有相似的吸附性能：吸附动力学迅速，接触 5 小时内达到平衡，对水中 Cu(II)离子的吸附容量显著提高。主要的吸附机制被确定为络合反应，由原始生物炭中的羧基和羟基以及所有三种 MnFeO-生物炭中的 Mn-O 和 Fe-O 基团贡献。MnFeO-生物炭可以重复使用三次，再生生物炭对 Cu(II)的最大吸附容量随着沉淀的 MnFeO 的损失而下降。
