Adsorption and removal mechanism of Pb(II) by oxidized multi-walled carbon nanotubes

被引：9

作者：

Fu, Qiuping ^{[1
]}

Lou, Jie ^{[1
]}

Shi, Denghong ^{[1
]}

Zhou, Shaoqi ^{[2
]}

Hu, Jing ^{[2
]}

Wang, Qi ^{[1
]}

Huang, Weijiang ^{[1
]}

Wang, Kui ^{[1
]}

Yan, Wei ^{[1
]}

机构：

[1] Guiyang Univ, Coll Chem & Mat Engn, Guiyang 550005, Peoples R China

[2] Guizhou Univ, Coll Resource & Environm Engn, Guiyang 550003, Peoples R China

来源：

JOURNAL OF THE IRANIAN CHEMICAL SOCIETY | 2022年 / 19卷 / 07期

关键词：

MWCNTs; Oxidation modification; Heavy metal ions; Pb(II); Adsorption; AQUEOUS-SOLUTION; EFFICIENT REMOVAL; CD(II); IONS;

D O I：

10.1007/s13738-022-02502-1

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Multi-walled carbon nanotubes (MWCNTs) were treated by reflux oxidation in a mixture (HNO3 and H2SO4), hydroxyl (-OH) and carboxyl (-COOH) functional groups were introduced on the surface of MWCNTs to obtain the Oxidized-MWCNTs (OMWCNTs). OMWCNTs were used as adsorbent to removal of Pb(II) from wastewater. The effects of contact time, initial concentration of Pb(II), OMWCNTs dosage, pH and coexisting ions (K+, Na+, Ca2+, Mg2+) on the adsorption and removal of Pb(II) by OMWCNTs were systematically studied. The adsorption of Pb(II) by OMWCNTs could reach equilibrium in 10 min. The pH > 5 is conductive to the adsorption of Pb(II) by OMWCNTs. The coexisting ions (K+, Na+, Ca2+, Mg2+) had almost no effect on the adsorption of Pb(II) by OMWCNTs. The results showed that the isothermal data fit the Freundlich and Langmuir isotherm models. The maximum adsorption capacity was 558.66 mg/g for Pb(II) from Langmuir isotherm. The pseudo-second-order kinetic model could well describe the adsorption process of Pb(II).

引用

页码：2883 / 2890

页数：8

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