Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
J Hazard Mater. 2020 Jun 15;392:122509. doi: 10.1016/j.jhazmat.2020.122509. Epub 2020 Mar 9.
The high chemical stability of lead complexes in solution precludes most traditional removal methods. Achieving the efficient, cost-effective, and environmentally friendly removal of metal complexes from wastewater is a challenge. In this study, ferrous phosphate and iron phosphate were used to treat wastewater containing EDTA-Pb, and the differences in their removal processes were compared. Both materials enabled efficient removal of the EDTA-Pb complex from 50 mg Pb/L to <1 mg Pb/L, and the leaching of Fe was <50 mg/L. More attractively, the maximum adsorption capacity of ferrous phosphate significantly increased from 80.44 mg Pb/g to 436.68 mg Pb/g as the reaction environment changed from aerobic to anoxic. The concentration of Pb was reduced to the sub-ppm level by ferrous phosphate even when the initial concentration of EDTA-Pb was 300 mg/L. In-depth exploration of the removal mechanism of EDTA-Pb demonstrated that the synergistic effect of Fe and Fe contributed to the high removal efficiency of EDTA-Pb by ferrous phosphate. Moreover, ferrous phosphate was minimally affected by salinity and organics, but the iron phosphate performance was significantly suppressed. The potential application of ferrous phosphate was further explored by processing explosive wastewater containing lead complexes. The results showed that the residual Pb content was 0.94 mg/L (lower than the discharge standard of China) and the removal performance of iron phosphate was suppressed. The results demonstrate that ferrous phosphate is a promising material for the decontamination of EDTA-Pb-contaminated water.
在溶液中，铅配合物具有很高的化学稳定性，这使得大多数传统的去除方法都无法奏效。因此，实现从废水中高效、经济且环保地去除金属配合物是一项挑战。在这项研究中，使用磷酸亚铁和磷酸铁来处理含有 EDTA-Pb 的废水，并比较了它们在去除过程中的差异。这两种材料都能有效地将 EDTA-Pb 配合物从 50mg Pb/L 去除至 <1mg Pb/L，且 Fe 的浸出量 <50mg/L。更吸引人的是，当反应环境从有氧变为缺氧时，磷酸亚铁的最大吸附容量从 80.44mg Pb/g 显著增加到 436.68mg Pb/g。即使 EDTA-Pb 的初始浓度为 300mg/L，磷酸亚铁也能将 Pb 的浓度降低至亚 ppm 水平。通过对 EDTA-Pb 去除机制的深入探讨，证明了 Fe 和 Fe 的协同作用是磷酸亚铁对 EDTA-Pb 具有高去除效率的原因。此外，磷酸亚铁受盐度和有机物的影响较小，而磷酸铁的性能则受到显著抑制。通过处理含铅配合物的爆炸废水进一步探索了磷酸亚铁的潜在应用。结果表明，残留的 Pb 含量为 0.94mg/L（低于中国的排放标准），且磷酸铁的去除性能受到抑制。结果表明，磷酸亚铁是一种很有前途的用于去除 EDTA-Pb 污染水的材料。
