Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 424, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.127356
Keywords
Adsorption; Metal recovery; Rare earth elements; Porous organic polymer (POP)
Categories
Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2019R1A2C2002313, 2020R1A5A101913, 2020K1A4A7A02 095371]
- National Research Foundation of Korea [2019R1A2C2002313] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study introduces two novel benzylphosphate-based covalent porous organic polymers (BPOP-1 and BPOP-2) for efficiently recovering heavy rare earth elements (HREEs) with high adsorption capacities and superior adsorption kinetics. The materials exhibit unusual crystalline nature, large surface area, hierarchical pore structure, and exceptional cyclic adsorption/desorption properties. The introduction of phosphate functionality into a robust porous polymer backbone with high surface area is a promising strategy for selective HREEs capture from wastewater.
It has been a major challenge to develop stable and cost-effective porous materials that efficiently recover heavy rare earth elements (HREEs) due to ever-increasing demand, low availability and high cost of HREEs. This study presents two novel benzylphosphate-based covalent porous organic polymers (BPOP-1 and BPOP-2) that were prepared by facile one-pot Friedel-Crafts reactions. Various analytical techniques are used to investigate the successful syntheses of BPOP materials and establish their material properties, which include an unusual crystalline nature, large surface area, hierarchical pore structure, and superior chemical stabilities. The BPOPs effectively adsorb, and thus remove HREEs from aqueous media. In particular, BPOP-1 had higher phosphate content and exhibits superior adsorption capacities (Eu3+: 289.5; Gd3+: 292.7; Tb3+: 294.4; Dy3+: 301.9 mg/g) than BPOP-2, while BPOP-2 had higher mesoporosity and correspondingly supports faster adsorption kinetics. Remarkably, both BPOP materials exhibit some of the highest HREE adsorption capacities reported to date, the selective capture of Dy3+ ions, and excellent cyclic adsorption/desorption properties. We provide a potential adsorption mechanism for Dy3+ capture by the BPOP adsorbent. These demonstrate that introducing phosphate functionality into a robust porous polymer backbone with high surface area is a promising strategy for selective HREEs capture from wastewater.
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