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Mechanistic investigation of Pb 2+ adsorption on biochar modified with sodium alginate composite zeolitic imidazolate framework-8.
- Source :
-
Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 May; Vol. 31 (21), pp. 31605-31618. Date of Electronic Publication: 2024 Apr 19. - Publication Year :
- 2024
-
Abstract
- For the serious situation of heavy metal pollution, the use of cheap, clean, and efficient biochar to immobilize heavy metals is a good treatment method. In this paper, SA@ZIF-8/BC was prepared for the adsorption of Pb <superscript>2+</superscript> in solution using sodium alginate (SA) and zeolitic imidazolate framework-8 (ZIF-8) modified corn cob biochar. The results showed that the specific surface area of modified biochar was greatly improved, with good adsorption capacity for Pb <superscript>2+</superscript> , strong anti-interference ability, and good economy. At the optimal adsorption pH of 5, the adsorption model of Pb <superscript>2+</superscript> by SA@ZIF-8/BC was more consistent with the pseudo-second-order kinetic model and Langmuir isotherm model. This indicates that the adsorption of Pb <superscript>2+</superscript> by SA@ZIF-8/BC is chemisorption and monolayer adsorption. The maximum adsorption of modified biochar was 300 mg g <superscript>-1</superscript> , which was 2.38 times higher than that of before modified BC (126 mg g <superscript>-1</superscript> ). The shift in binding energy of functional groups before and after adsorption of SA@ZIF-8/BC was studied by XPS, and it was found that hydroxyl and carboxyl groups played an important role in the adsorption of Pb <superscript>2+</superscript> . It was demonstrated that this novel adsorbent can be effectively used for the treatment of Pb pollution in wastewater.<br /> (© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Details
- Language :
- English
- ISSN :
- 1614-7499
- Volume :
- 31
- Issue :
- 21
- Database :
- MEDLINE
- Journal :
- Environmental science and pollution research international
- Publication Type :
- Academic Journal
- Accession number :
- 38637484
- Full Text :
- https://doi.org/10.1007/s11356-024-33320-y