Enhanced adsorption of radioactive cesium from nuclear wastewater using ZIF-67 laminated 2D MXene Ti3C2

被引:0
|
作者
Zhang, Han [1 ,2 ,3 ]
Chi, Yujing [1 ,4 ]
Li, Jiayi [1 ,4 ]
Peng, Jinsong [1 ,4 ]
Song, Haiyan [1 ,4 ]
Chen, Chunxia [1 ,4 ]
Bai, Xuefeng [1 ,2 ]
机构
[1] Northeast Forestry Univ, Coll Chem Chem Engn & Resource Utilizat, Dept Chem & Chem Engn, Harbin 150040, Peoples R China
[2] Harbin Engn Univ, Coll Chem & Mat Sci & Chem Engn, Harbin 150001, Peoples R China
[3] Harbin Inst Petr, Coll Chem Engn, Harbin 150027, Peoples R China
[4] Northeast Forestry Univ, Ctr Innovat Res Synthet Chem & Resource Utilizat, Harbin 150040, Peoples R China
基金
中国国家自然科学基金;
关键词
Radioactive cesium adsorption; ZIF-67; Laminating; Adsorption mechanism; IMIDAZOLATE FRAMEWORK ZIF-67; REDUCTION; REMOVAL; CO2; ADSORBENT; CARBON; CS(I);
D O I
10.1016/j.seppur.2024.129590
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Development of nuclear industry has caused severe water pollution. Adsorptive removal of radionuclides from wastewater has been regarded as effective solution for environment. However, developing adsorbents with high adsorption capacity and selectivity for removal of radionuclides (such as 137 Cs) is still a challenge. Herein, we adopted an in situ assemble strategy to construct a novel composite, in which zeolitic imidazolate framework (ZIF-67) was grafted into two-dimension (2D) layers of transition metal carbides/nitrides (MXenes) Ti3C2, and used it in adsorptive removal of Cs+ from wastewater. Laminated and pillaring effect of ZIF-67 increased interlayer spacing and specific surface area of Ti3C2, significantly enhancing Cs+ cooporation. MXenes matrix provided the main adsorptive sites and interaction to stabilize Cs+, + , while the hybrid ZIF-67 assisted adsorption. The adsorbent achieved 96.2 % removal for 5 mg & sdot;L(-1 )of Cs+ within 6 h, and 50.0 m & sdot;g(-1) ( )of maximum adsorption capacity, with good recyclability for 4 times. Ion competition, kinetics and thermodynamics were studied in detail to obtain the behavior of Cs+ adsorption. Finally, adsorption mechanism was proposed that [Ti- O]- H+ and [Ti- O] groups of 2D Ti3C2 were main adsorptive sites to participate in ion exchange and complexation with Cs+, respectively, while 2-methylimidazole (2-MI) ligands in ZIF-67 were synergetic adsorption sites.
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页数:13
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