Journal
JOURNAL OF CLEANER PRODUCTION
Volume 333, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2021.130229
Keywords
MIL-121; Alginate; Adsorption; Heavy metal ion
Categories
Funding
- Natural Science Foundation of Jiangsu Province for Youth scholar [BK20180766]
- China Scholarship Council [202008320018]
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In this study, MIL-121 crystals were incorporated into a biodegradable alginate matrix to form composite beads, which showed enhanced recyclability and adsorption capacity. The optimal sample exhibited high adsorption capacities for Cu2+ and Cd2+. In addition, the composite beads could be effectively regenerated using hot water without the need for strong acids.
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 ?). 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.
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