School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
Faculty of Materials Metallurgy & Chemistry, Jiangxi University of Science & Technology, Ganzhou, Jiangxi 341000, China.
J Hazard Mater. 2020 Jun 5;391:122193. doi: 10.1016/j.jhazmat.2020.122193. Epub 2020 Feb 7.
Developing a material with high adsorption capacity and selectivity to remove lead from Pb polluted wastewater is of vital importance for environment protection and resources utilization. In this study, a novel composite, SiO decorated with nano ferrous oxalate (SDNF), was prepared from natural biotite containing ores to remove Pb. Pseudo-first-order kinetic (R = 0.99) and Langmuir models (R = 0.99) fitted the data well, manifesting that Pb adsorption process was monolayer adsorption. The maximum Pb adsorption capacity was identified as 446.98 mg/g. SEM and TEM images showed that nano ferrous oxalate with average size of 11.51 nm was coated on the surface of ores, and their distributions were uniform. Results of XRD, XPS, FTIR and zeta potential indicated that ion exchange, surface complexation and electrostatic attraction interaction were involved in the remvoal of Pb, and the ion exchange between Fe and Pb played a major role. Moreover, both Cd and Zn removal efficiency are less than 2 % in Pb-Cd or Pb-Zn coexisted solution, indicating the composite possessed high selectivity for Pb removal. All above results indicated that the composite was a material with high adsorption capacity and selectivity for Pb, which was suitable for remediation of Pb pollution from Pb containing wastewater.
制备一种对 Pb 污染废水中 Pb 具有高吸附容量和选择性的材料，对于环境保护和资源利用至关重要。本研究采用含天然黑云母矿石为原料，制备了一种新型的纳米草酸亚铁修饰的 SiO 复合材料（SDNF）来去除 Pb。准一级动力学（R=0.99）和 Langmuir 模型（R=0.99）很好地拟合了数据，表明 Pb 吸附过程为单层吸附。最大 Pb 吸附容量为 446.98 mg/g。SEM 和 TEM 图像表明，纳米草酸亚铁以平均尺寸为 11.51 nm 的颗粒包覆在矿石表面，且分布均匀。XRD、XPS、FTIR 和 zeta 电位结果表明，Pb 的去除涉及离子交换、表面络合和静电吸引相互作用，其中 Fe 和 Pb 之间的离子交换起主要作用。此外，在 Pb-Cd 或 Pb-Zn 共存溶液中，Cd 和 Zn 的去除效率均小于 2%，表明该复合材料对 Pb 的去除具有高选择性。综上所述，该复合材料是一种对 Pb 具有高吸附容量和选择性的材料，适用于含 Pb 废水的污染修复。
