College of Environmental Science and Engineering, Yangzhou University, Yangzhou, 225127, China.
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Environ Pollut. 2023 Dec 1;338:122710. doi: 10.1016/j.envpol.2023.122710. Epub 2023 Oct 11.
Heavy metal complexes receive less attention, but they are more difficult to remove than the free heavy metals. Moreover, the high-salinity wastewaters from various industries hinder the removal of heavy metal complexes. Removal of the metal complexes is a top priority but a challenging task. Herein, a new strategy for removing Cu-EDTA from high-salinity wastewater with sulfide-modified nanozerovalent iron (S-NZVI) was proposed. The S-NZVI exhibited a considerable adsorption capacity for Cu-EDTA (∼83 mg Cu/g) at a high salt concentration (25 g/L NaCl). Similarly, the S-NZVI maintained excellent adsorption performance (∼83 mg Cu/g) in the presence of CaCl, MgCl, NaSO, and NaNO (25 g/L). The S-NZVI showed extremely high efficiency for Cu-EDTA removal; 50 mg/L of Cu-EDTA was almost completely removed in 1 min, and the k was approximately 1.5 g/(mg min). The S-NZVI showed an extensive pH working range, and within the pH range of 2-9, the Cu-EDTA was removed completely within 5 min. The excellent removal performance of the S-NZVI was due to the high reactivity and high affinity of NZVI for Cu, as well as the special substitution of Fe and the interfacial reactions between S-NZVI and the copper complexes. Compared with other studies of Cu complex removal, removal with S-NZVI was a simpler process with higher efficiency. In brief, S-NZVI efficiently removed Cu complexes from harsh water environments and was reused many times. The process was simple and efficient and has broad application prospects.
重金属络合物受到的关注较少，但它们比游离重金属更难去除。此外，来自各种工业的高盐废水会阻碍重金属络合物的去除。去除金属络合物是当务之急，但也是一项具有挑战性的任务。在此，提出了一种用硫化改性纳米零价铁（S-NZVI）去除高盐废水中 Cu-EDTA 的新策略。S-NZVI 在高盐浓度（25 g/L NaCl）下对 Cu-EDTA 具有相当大的吸附能力（∼83 mg Cu/g）。同样，S-NZVI 在存在 CaCl、MgCl、NaSO 和 NaNO（25 g/L）的情况下保持优异的吸附性能（∼83 mg Cu/g）。S-NZVI 对 Cu-EDTA 的去除效率极高；50 mg/L 的 Cu-EDTA 在 1 分钟内几乎完全去除，k 值约为 1.5 g/（mg min）。S-NZVI 具有广泛的 pH 工作范围，在 2-9 的 pH 范围内，Cu-EDTA 在 5 分钟内完全去除。S-NZVI 的优异去除性能归因于 NZVI 对 Cu 的高反应性和高亲和力，以及 Fe 的特殊取代和 S-NZVI 与铜络合物之间的界面反应。与其他 Cu 络合物去除研究相比，用 S-NZVI 去除具有更高的效率且过程更简单。简而言之，S-NZVI 可从恶劣的水环境中有效去除 Cu 络合物，并可多次重复使用。该过程简单高效，具有广阔的应用前景。
