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Integration of thermoresponsive MIL-121 into alginate beads for efficient heavy metal ion removal.
- Source :
-
Journal of Cleaner Production . Jan2022, Vol. 333, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- Metal-organic frameworks (MOFs) have been widely explored as adsorbents for heavy metal ions removal. However, the recovery and regeneration of powdery MOFs remains a huge challenge. In this work, MIL-121 (Al-based MOF) crystals were incorporated into biodegradable alginate matrix to form composite beads with enhanced recyclability and adsorption capacity. A systematic adsorption test for Cu2+ and Cd2+ was conducted and the optimal sample (with a MOF loading of 50 wt%) presented an adsorption capacity of 204.5 mg/g for Cu2+ and 88.7 mg/g for Cd2+. Moreover, the composite beads can be regenerated effectively by hot water (80 °C). The desorption is attributed to the carboxyl-rich MIL-121, which could release massive protons (H+) at elevated temperature. Compared with the traditional desorption using strong acids, this chemical-free thermal desorption strategy holds a great potential for adsorbent regeneration and practical wastewater treatment. [Display omitted] • MIL-121 was integrated into biodegradable alginate to form composite beads. • The composite beads exhibited high heavy metal ion removal efficiency. • The composite bead can be recycled easily. • The composite beads can desorb heavy metal ions in 80 °C hot water. [ABSTRACT FROM AUTHOR]
- Subjects :
- *METAL ions
*HEAVY metals
*ALGINIC acid
*THERMAL desorption
*ALGINATES
Subjects
Details
- Language :
- English
- ISSN :
- 09596526
- Volume :
- 333
- Database :
- Academic Search Index
- Journal :
- Journal of Cleaner Production
- Publication Type :
- Academic Journal
- Accession number :
- 154560987
- Full Text :
- https://doi.org/10.1016/j.jclepro.2021.130229