Mechanisms of Cu~(2+) , triethylenetetramine (TETA), and Cu-TETA sorption on rectorite and its use for metal removal via metal-TETA complexation

Li Zhaohui; Chang Po-Hsiang; Jiang Wei-Teh

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Mechanisms of Cu~(2+) , triethylenetetramine (TETA), and Cu-TETA sorption on rectorite and its use for metal removal via metal-TETA complexation

机译：Cu〜（2+），三亚乙基四胺（TETA）和Cu-TETA在累托石上的吸附机理及其通过金属-TETA络合去除金属的用途

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Uptake of metals, organics, and formation of metal-organic complexes on the surface or in the interlayer of clay minerals had been studied extensively over the last half century. In this study, we investigated the uptake mechanisms of Cu2+, triethylenetetramine (TETA), and Cu-TETA on rectorite and its use for metal removal via metal-TETA complexation. The uptake of Cu2+, TETA, and Cu-TETA by rectorite occurred on the external as well as in the interlayer space, resulting in a change of d(001)-spacing due to differences in sizes of interlayer cations or complexes. Although the uptake of Cu2+ and Cu-TETA by rectorite was via a cation exchange process as evidenced by the stoichiometric desorption of dominant interlayer cation Ca2+, the uptake of TETA alone on rectorite was via complexation with interlayer cation Ca2+. Due to strong affinity of TETA for Cu2+, significant amounts of Cu2+ uptake occurred on TETA-rectorite. Desorption of Ca2+ from TETA-rectorite confirmed the replacement of interlayer cation Ca2+ by Cu2+. However, the replacement of Ca2+ by Cu2+ in TETA-rectorite did not involved in removal of TETA. As such, TETA-modified clay minerals may serve as a type of sorbents for the removal of selected heavy metals via surface or interlayer via complexation.

机译：在过去的半个世纪中，对粘土矿物的表面或中间层中金属，有机物的吸收以及金属-有机络合物的形成进行了广泛的研究。在这项研究中，我们研究了Cu2 +，三亚乙基四胺（TETA）和Cu-TETA在累托石上的吸收机理及其通过金属-TETA络合去除金属的用途。累累石对Cu2 +，TETA和Cu-TETA的吸收发生在外部以及层间空间中，由于层间阳离子或络合物大小的差异，导致d（001）间距发生变化。尽管累累石对Cu2 +和Cu-TETA的吸收是通过阳离子交换过程进行的，如主要层间阳离子Ca2 +的化学计量脱附所证明的，但累多石上单独TETA的吸收是通过与层间阳离子Ca2 +的络合。由于TETA对Cu2 +具有很强的亲和力，因此TETA锂蒙脱石上发生了大量的Cu2 +吸收。从TETA锂蒙脱石中解吸Ca2 +证实了层间阳离子Ca2 +被Cu2 +替代。但是，在TETA锂蒙脱石中用Cu2 +代替Ca2 +并不参与TETA的去除。因此，TETA改性的粘土矿物可以用作一种吸附剂，用于通过表面或通过中间层通过络合去除选定的重金属。

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来源
《Journal of Hazardous Materials》 |2019年第5期|187-196|共10页
作者
Li Zhaohui; Chang Po-Hsiang; Jiang Wei-Teh;
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作者单位

China Univ Geosci, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Natl Lab Mineral Mat, Sch Mat Sci & Technol, 29 Xueyuan Rd, Beijing 100083, Peoples R China|Natl Cheng Kung Univ, Dept Earth Sci, 1 Univ Rd, Tainan 70101, Taiwan|Univ Wisconsin Parkside, Dept Geosci, 900 Wood Rd, Kenosha, WI 53144 USA;

Natl Cheng Kung Univ, Dept Earth Sci, 1 Univ Rd, Tainan 70101, Taiwan;

Natl Cheng Kung Univ, Dept Earth Sci, 1 Univ Rd, Tainan 70101, Taiwan;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种 eng
中图分类
关键词
Cation exchange; Complexation; Triethylenetetramine; Rectorite; Uptake;

机译：阳离子交换;络合;三亚乙基四胺;累托石;吸收;

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Mechanisms of Cu~(2+) , triethylenetetramine (TETA), and Cu-TETA sorption on rectorite and its use for metal removal via metal-TETA complexation

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