Chi Zifang, Ju Shijie, Liu Xinyang, Sun Feiyang, Zhu Yuhuan
Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, PR China.
Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, PR China.
Chemosphere. 2022 Dec;308(Pt 1):136253. doi: 10.1016/j.chemosphere.2022.136253. Epub 2022 Aug 31.
Sulfidated nano zero-valent iron (S-nZVI) was used to remove various pollutants from wastewater. However, the instability, poor dispersibility, and low electron transfer efficiency of S-nZVI limit its application. Herein, graphene oxide supported sulfidated nano zero-valent iron (S-nZVI@GO) was successfully synthesized using graphene oxide (GO) as a carrier. The properties of S-nZVI@GO were characterized by scanning electron microscopy coupled to X-ray photoelectron spectroscopy (SEM-EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) concerning the surface morphology, crystalline structure, and elemental components. S-nZVI@GO displayed an excellent capacity for antimony (Sb) removal under aerobic conditions (96.7%), with a high adsorption capacity (Q = 311.75 mg/g). It maintained a high removal rate (over 90%) during a wide pH range (3-9). More importantly, S-nZVI@GO activated the molecular oxygen in water via a single-electron pathway to produce •O－ and HO, and then oxidized trivalent antimony (Sb(III)) to pentavalent antimony (Sb(V)) and further separated it by synergistic adsorption and co-precipitation. Therefore, S-nZVI@GO shows excellent potential for Sb contamination remediation.
硫化纳米零价铁（S-nZVI）被用于去除废水中的各种污染物。然而，S-nZVI的不稳定性、较差的分散性和较低的电子转移效率限制了其应用。在此，以氧化石墨烯（GO）为载体成功合成了氧化石墨烯负载的硫化纳米零价铁（S-nZVI@GO）。通过扫描电子显微镜与X射线光电子能谱联用（SEM-EDS）、X射线衍射（XRD）以及涉及表面形态、晶体结构和元素组成的X射线光电子能谱（XPS）对S-nZVI@GO的性能进行了表征。S-nZVI@GO在好氧条件下对锑（Sb）具有优异的去除能力（96.7%），吸附容量较高（Q = 311.75 mg/g）。在较宽的pH范围（3 - 9）内，其去除率保持在较高水平（超过90%）。更重要的是，S-nZVI@GO通过单电子途径活化水中的分子氧生成•O－和HO，然后将三价锑（Sb(III)）氧化为五价锑（Sb(V)），并通过协同吸附和共沉淀进一步将其分离。因此，S-nZVI@GO在修复Sb污染方面显示出优异的潜力。
