School of Resources and Civil Engineering, Northeastern University, Shenyang, 110819, China.
Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, 999077, China.
Environ Sci Pollut Res Int. 2021 Apr;28(13):16408-16419. doi: 10.1007/s11356-020-11811-y. Epub 2021 Jan 2.
The novel magnetic biochar (MBC), derived from co-pyrolysis of sewage sludge and biomass loading nanosized iron oxide particles, was used as an environmentally friendly adsorbent. The loading of magnetic particles was in favor of increasing the adsorption capacity and separation from aqueous system for biochar (BC). The physical/chemical characteristics of MBC were revealed by elemental analysis, VSM, SEM-EDS, XRD, FTIR, zeta potential, and batch adsorption-desorption experiments. The nanosized γ-FeO particles grown on the surface of biochar showed ferromagnetic property. For the remediation of Cu(II) contamination, MBC-5 showed remarkable adsorption capacity of 67.68 mg/g, and presented a wide pH range of 3.0-6.0. The Langmuir isothermal and pseudo-second-order model could describe adsorption process well. The adsorption mechanism of Cu(II) involved physical adsorption, ion exchange, and electrostatic surface complexation on the surface of MBCs. In the desorption experiments, MBC-5 holds the adsorption efficiency of 81.09% after fifth recycle still, which illustrated a remarkable performance of cyclic utilization by the solid waste of sewage sludge and biomass.
新型磁性生物炭（MBC）由污水污泥和生物质共热解制备纳米氧化铁颗粒负载而成，是一种环保型吸附剂。磁性颗粒的负载有利于增加生物炭（BC）的吸附容量和从水相中分离。通过元素分析、VSM、SEM-EDS、XRD、FTIR、ζ电位和批量吸附-解吸实验揭示了 MBC 的物理/化学特性。生长在生物炭表面的纳米γ-FeO 颗粒具有铁磁性。在修复 Cu(II)污染方面，MBC-5 表现出 67.68mg/g 的显著吸附容量，且呈现出 3.0-6.0 的宽 pH 范围。Langmuir 等温线和拟二级动力学模型能够很好地描述吸附过程。Cu(II)的吸附机制涉及物理吸附、离子交换和 MBC 表面的静电表面络合。在解吸实验中，MBC-5 在第五次循环后仍保持 81.09%的吸附效率，这表明通过污水污泥和生物质的固体废物实现了循环利用的显著性能。
