Selective adsorption of Cr(VI) by nitrogen-doped hydrothermal carbon in binary system.
Environ Geochem Health
; 46(4): 121, 2024 Mar 14.
Article
em En
| MEDLINE
| ID: mdl-38483644
ABSTRACT
Selective adsorption of heavy metal ions from industrial effluent is important for healthy ecosystem development. However, the selective adsorption of heavy metal pollutants by biochar using lignin as raw material is still a challenge. In this paper, the lignin carbon material (N-BLC) was synthesized by a one-step hydrothermal carbonization method using paper black liquor (BL) as raw material and triethylene diamine (TEDA) as nitrogen source. N-BLC (21) showed excellent selectivity for Cr(VI) in the binary system, and the adsorption amounts of Cr(VI) in the binary system were all greater than 150 mg/g, but the adsorption amounts of Ca(II), Mg(II), and Zn(II) were only 19.3, 25.5, and 6.3 mg/g, respectively. The separation factor (SF) for Cr(VI) adsorption was as high as 120.0. Meanwhile, FTIR, elemental analysis and XPS proved that the surface of N-BLC (21) contained many N- and O- containing groups which were favorable for the removal of Cr(VI). The adsorption of N-BLC (21) followed the Langmuir model and its maximum theoretical adsorption amount was 618.4 mg/g. After 5th recycling, the adsorption amount of Cr(VI) by N-BLC (21) decreased about 15%, showing a good regeneration ability. Therefore, N-BLC (21) is a highly efficient, selective and reusable Cr(VI) adsorbent with wide application prospects.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Poluentes Químicos da Água
/
Metais Pesados
Idioma:
En
Revista:
Environ Geochem Health
Assunto da revista:
QUIMICA
/
SAUDE AMBIENTAL
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
China