Removal of heavy metal ions and polybrominated biphenyl ethers by sulfurized nanoscale zerovalent iron: Compound effects and removal mechanism

被引：45

作者：

Wei, Xipeng ^{[1
]}

Guo, Zhanyu ^{[1
]}

Yin, Hua ^{[1
]}

Yuan, Yibo ^{[1
]}

Chen, Ruxia ^{[1
]}

Lu, Guining ^{[1
]}

Dang, Zhi ^{[1
]}

机构：

[1] South China Univ Technol, Sch Environm & Energy, Key Lab Minist Educ Pollut Control & Ecosyst Rest, Guangdong Prov Key Lab Solid Wastes Pollut Contro, Guangzhou 510006, Guangdong, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2021年 / 414卷

基金：

中国国家自然科学基金;

关键词：

Heavy metal ions; Polybrominated diphenyl ethers; S-nZVI; Reductive reaction; DIPHENYL ETHERS; DECABROMODIPHENYL ETHER; AQUEOUS-SOLUTION; DEBROMINATION; NZVI; SULFIDATION; REACTIVITY; DECHLORINATION; TRANSFORMATION; SEQUESTRATION;

D O I：

10.1016/j.jhazmat.2021.125555

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Sulfurized nanoscale zerovalent iron (S-nZVI) has been widely reported to be able to quickly remove heavy metals/persistent organic pollutants, but the limited understanding of the complicated removal process of heavy metals-organic combined pollutants restricts the application of S-nZVI. Here, we demonstrate that there is significant difference in the effectiveness of S-nZVI for removing single pollutant and complex pollutants. The removal kinetic constant (lobs) of heavy metals by S-nZVI followed a sequence of Cr(VI)>Pb(II)>Ni(II)>Cd(II) with or without polybrominated diphenyl ethers (PBDEs). While the capacity of co-existing cations increasing the lobs of PBDEs followed the order: Ni(II)>Pb(II)>Cd(II), and the co-existence of Cr(VI) anion inhibited the reduction of PBDE by S-nZVI because the generated Cr-Fe precipitate hindered the electron transfer. The depassivation process on S-nZVI surface by Cd(II) ions slightly accelerated the transformation rate of electron. Nevertheless, the co-existing Pb(II) significantly accelerated the transformation of BDE-209 via the galvanic effect from the generated Pb0/Fe0 bimetal. Interestingly, the lobs of BDE-47 in Ni(II)/S-nZVI system was 5.51 times higher than that of Pb(II)/S-nZVI system, implying that an atomic hydrogen mechanism dominated the reduction of BDE-47 by Ni(II)/S-nZVI. In conclusion, the results provided a deep comprehending of removal mechanism of heavy metal-organic complex pollutants by S-nZVI.

引用

页数：8