Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
Department of Environmental Engineering, School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
Bioresour Technol. 2017 Aug;238:399-406. doi: 10.1016/j.biortech.2017.03.133. Epub 2017 Mar 31.
Highly efficient magnetic sewage sludge biochar (MSSBC) discloses feasible fabrication process with lower production cost, superior adsorption capacity, usage of waste sewage sludge as resource, selected by external magnetic field and exceptional regeneration property. 2gL MSSBC exhibited a high adsorption capacity of 249.00mgg in 200ppmPb(II) and the lead-MSSBC equilibrium was achieved within one hour, owing to the existence of the copious active sites. The adsorption kinetics was well described by the pseudo-second-order model while the adsorption isotherm could be fitted by Langmuir model. Mechanism study demonstrated the adsorption involved electrostatic attraction, ion exchange, inner-sphere complexation and formation of co-precipitates at the surface of MSSBC. Additionally, adsorption performance maintained remarkable in a broad pH window. These outcomes demonstrated the promising waste resource utilization by a feasible approach that turns the solid waste of sewage sludge into biochar adsorbent with auspicious applications in elimination of Pb(II) from wastewater.
高效磁性污水污泥生物炭（MSSBC）揭示了可行的制造工艺，具有较低的生产成本、更高的吸附能力、利用废污水污泥作为资源、通过外加磁场选择和优异的再生性能。在 200ppmPb(II) 中，2gL MSSBC 表现出 249.00mgg 的高吸附容量，并且由于存在大量的活性位点，铅-MSSBC 平衡在一小时内达到。吸附动力学很好地符合拟二级模型，而吸附等温线可以用 Langmuir 模型拟合。机理研究表明，吸附涉及静电吸引、离子交换、内球络合和在 MSSBC 表面形成共沉淀。此外，吸附性能在很宽的 pH 窗口中保持显著。这些结果表明，通过一种可行的方法将污水污泥等固体废物转化为生物炭吸附剂，有望实现废水中 Pb(II) 的去除，从而实现废物资源的利用。
