零价铁
X射线光电子能谱
石墨烯
锑
氧化物
吸附
化学
扫描电子显微镜
无机化学
化学工程
材料科学
核化学
纳米技术
有机化学
工程类
复合材料
作者
Zifang Chi,Shi-Jie Ju,Xinyang Liu,Feiyang Sun,Yuhuan Zhu
出处
期刊:Chemosphere
[Elsevier]
日期:2022-08-01
卷期号:308: 136253-136253
标识
DOI:10.1016/j.chemosphere.2022.136253
摘要
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 (Qmax = 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 •O2- and H2O2, 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.
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