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Zero-valent manganese nanoparticles coupled with different strong oxidants for thallium removal from wastewater
Frontiers of Environmental Science & Engineering ( IF 6.4 ) Pub Date : 2020-01-22 , DOI: 10.1007/s11783-019-1213-5
Keke Li , Huosheng Li , Tangfu Xiao , Gaosheng Zhang , Aiping Liang , Ping Zhang , Lianhua Lin , Zexin Chen , Xinyu Cao , Jianyou Long

Abstract

Nano zero-valent manganese (nZVMn, Mn0) was prepared through a borohydride reduction method and coupled with different oxidants (persulfate (S2O82−), hypochlorite (ClO), or hydrogen peroxide (H2O2)) to remove thallium (Tl) from wastewater. The surface of Mn0 was readily oxidized to form a core-shell composite (MnOx@Mn0), which consists of Mn0 as the inner core and MnOx (MnO, Mn2O3, and Mn3O4) as the outer layer. When Mn0 was added alone, effective Tl(I) removal was achieved at high pH levels (>12). The Mn0-H2O2 system was only effective in Tl(I) removal at high pH (>12), while the Mn0-S2O82− or Mn0-ClO-system had excellent Tl(I) removal (>96%) over a broad pH range (4–12). The Mn0-S2O82− oxidation system provided the best resistance to interference from an external organic matrix. The isotherm of Tl(I) removal through the Mn0-S2O82− system followed the Freundlich model. The Mn0 nanomaterials can activate persulfate to produce sulfate radicals and hydroxyl radicals. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy suggested that oxidation-induced precipitation, surface adsorption, and electrostatic attraction are the main mechanisms for Tl(I) removal resulting from the combination of Mn0 and oxidants. Mn0 coupled with S2O82−/ClO is a novel and effective technique for Tl(I) removal, and its application in other fields is worthy of further investigation.



中文翻译:

零价锰纳米粒子与不同的强氧化剂结合用于废水中的th去除

摘要

纳米零价锰(nZVMn,锰0)通过硼氢化物还原的方法制备并与不同的氧化剂(过硫酸铵(š 2 ö 8 2- ),次氯酸盐(CLO - ),或过氧化氢(H 2 ö 2))从废水中去除th(Tl)。Mn 0的表面容易被氧化而形成核壳复合物(MnO x @Mn 0),该复合物由Mn 0作为内核和MnO x(MnO,Mn 2 O 3和Mn 3 O 4)组成。外层。当Mn 0单独加入三氟甲磺酸,在高pH值(> 12)下可有效去除Tl(I)。Mn 0 -H 2 O 2系统仅在高pH(> 12)下有效去除Tl(I),而Mn 0 -S 2 O 8 2-或Mn 0 -ClO系统具有优异的Tl(I)。在较宽的pH范围(4–12)范围内去除(> 96%)。Mn 0 -S 2 O 8 2-氧化系统提供了最佳的抗外部有机基质干扰的能力。通过Mn 0 -S 2 O 8 2-去除Tl(I)的等温线遵循Freundlich模型。锰0纳米材料可以活化过硫酸盐以产生硫酸根和羟基。傅里叶变换红外光谱法和X射线光电子能谱法表明,氧化诱导的沉淀,表面吸附和静电吸引是Mn 0和氧化剂的结合导致Tl(I)去除的主要机理。锰0耦合以S 2 ö 8 2- / CLO -为铊(I)除去一种新的和有效的技术,并且其在其他领域的应用是值得进一步研究。

更新日期:2020-03-20
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