零价铁
化学
降水
吸附
X射线光电子能谱
螯合作用
硫化物
氧化还原
还原剂
质量分数
核化学
铬
硫化钠
钠
无机化学
化学工程
材料科学
有机化学
物理
工程类
气象学
作者
Xu Wang,Xinnan Yang,Bi-Juan Huang,Zhuang Liu,Shi-Meng Mu,Min Cheng,Yanjun Xie
出处
期刊:Huan jing ke xue= Huanjing kexue
日期:2021-06-08
卷期号:42 (6): 2908-2916
被引量:1
标识
DOI:10.13227/j.hjkx.202010051
摘要
In this study, the functional material SZVI-SA is successfully prepared to efficiently remove Cr(Ⅵ) from water. This composite, with micron zero-valent iron (ZVI) as its core, is sulfurized and loaded by sodium alginate (SA). Some parameters affecting the Cr(Ⅵ) removal are also tested, including the type and mass fraction of chelating agents as well as S/Fe. SEM-EDS, TEM, XRD, and XPS are used to characterize and analyze the material. The results show that 7% Fe3+ is most suitable as the chelating agent for sodium alginate, and a S/Fe ratio of 3.5 and drying temperature of 70℃ are the ideal formation conditions. The effect of SZVI-SA on the removal of Cr(Ⅵ) is in line with the secondary adsorption rate model, mainly affected by the availability of binding sites. The active ingredient was identified as FeS, and the specific surface area can reach 97.83 m2·g-1. Many pores, especially micropores, are present in this material and in addition to Cr(Ⅵ), SZVI-SA was found to effectively remove Cr(Ⅲ) and Fe(Ⅲ) from the test solution. Overall, the Cr(Ⅵ)-removal efficiency was 92%; the removal mechanism is mainly via redox reactions; and the main reducing active substances are Fe2+, S2-, and S22-. Following the reaction of Fe(Ⅲ) and Cr(Ⅲ), Fe(OH)3 and Cr(OH)3 are formed and Cr2O3 precipitation separation occurs.
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