Novel benzylphosphate-based covalent porous organic polymers for the effective capture of rare earth elements from aqueous solutions

Ravi, Seenu; Kim, Seo-Yul; Bae, Youn‐Sang

doi:10.1016/j.jhazmat.2021.127356

Cited by 37 publications

(7 citation statements)

References 66 publications

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“…The appearance of the CC and CN stretching bands in both CTP-1-NH 2 and CTP-2-NH 2 , as well as the disappearance of the C–Cl band, indicate the successful formation of polymer networks. In addition, the N–H stretching bands at 3440 cm –1 and C–H stretching bands at 3030 cm –1 also supported the formation of the expected CTP-X-NH 2 networks. − …”

Section: Resultsmentioning

confidence: 62%

Metal-Free Amine-Anchored Triazine-Based Covalent Organic Polymers for Selective CO₂ Adsorption and Conversion to Cyclic Carbonates Under Mild Conditions

Ravi

Kim

Choi

et al. 2023

ACS Sustainable Chem. Eng.

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Attaining both large uptake and high conversion of CO2 under mild reaction conditions within a metal-free covalent organic polymer (COP) is an attractive and challenging strategy for CO2 utilization because CO2 is an abundant and renewable C1 source and a main greenhouse gas. In this study, novel amine-anchored covalent triazine aromatic polymers (CTP-1-NH2 and CTP-2-NH2) were synthesized from 2-amino-4,6-dichloro-1,3,5-triazine, biphenyl, and 1,3,5-triphenylbenzene via facile Friedel–Crafts arylation for CO2 adsorption and conversion reaction. At 273 K and 1 bar, CTP-1-NH2 and CTP-2-NH2 exhibited CO2 uptakes of 187.4 and 224.41 mg/g and CO2/N2 selectivity of 69.45 and 61.38, respectively, outperforming many previously reported COP materials. Moreover, metal-free CTP-1-NH2 with tetrabutylammonium bromide (n-Bu4NBr) exhibited high epoxide conversion and product selectivity under mild (40 °C and 1 bar) and solvent-free conditions within 36 h of reaction time, which were very much comparable to the performances of many metal-coordinated COP catalysts. The spent catalyst was also highly reusable with no active species leaching. A plausible mechanism for CO2 cycloaddition over the CTP-1-NH2 catalyst is proposed. Incorporating amine functionalities into a nitrogen-rich structure could be a promising strategy for developing materials with simultaneous CO2 capture and conversion.

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Section: Resultsmentioning

confidence: 62%

Metal-Free Amine-Anchored Triazine-Based Covalent Organic Polymers for Selective CO₂ Adsorption and Conversion to Cyclic Carbonates Under Mild Conditions

Ravi

Kim

Choi

et al. 2023

ACS Sustainable Chem. Eng.

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“…Ravi et al incorporated phosphate functional groups into POP materials to achieve materials with elevated specific surface area and pore volume (Figure 8). The experimental findings demonstrated the preferential capture of Dy(III) ions by the BPOP material in comparison to other competing cations, including Zn(II), Cu(II), Mg(II), and K(I) [92]. The above research experiments show that porous polymers enriched with phosphoric acid have better selectivity and adsorption of rare-earth elements, and their reusability is good, so the solid-phase extraction material with a high density of phosphoric acid groups is an ideal material for the recovery of rare earths.…”

Section: Porous Polymers Based On Phosphorylationmentioning

confidence: 91%

Overview of Functionalized Porous Materials for Rare-Earth Element Separation and Recovery

Peng,

Zhu,

Zou

et al. 2024

Molecules

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The exceptional photoelectromagnetic characteristics of rare-earth elements contribute significantly to their indispensable position in the high-tech industry. The exponential expansion of the demand for high-purity rare earth and related compounds can be attributed to the swift advancement of contemporary technology. Nevertheless, rare-earth elements are finite and limited resources, and their excessive mining unavoidably results in resource depletion and environmental degradation. Hence, it is crucial to establish a highly effective approach for the extraction and reclamation of rare-earth elements. Adsorption is regarded as a promising technique for the recovery of rare-earth elements owing to its simplicity, environmentally friendly nature, and cost-effectiveness. The efficacy of adsorption is contingent upon the performance characteristics of the adsorbent material. Presently, there is a prevalent utilization of porous adsorbent materials with substantial specific surface areas and plentiful surface functional groups in the realm of selectively separating and recovering rare-earth elements. This paper presents a thorough examination of porous inorganic carbon materials, porous inorganic silicon materials, porous organic polymers, and metal–organic framework materials. The adsorption performance and processes for rare-earth elements are the focal points of discussion about these materials. Furthermore, this work investigates the potential applications of porous materials in the domain of the adsorption of rare-earth elements.

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“…Bae and colleagues developed two innovative phosphate-functionalized porous organic polymers, namely BPOP-1 and BPOP-2, as illustrated in Figure 9a. Both of these BPOP materials exhibit exceptional chemical stability across a broad spectrum of pH conditions [99]. The research team assessed the potential of BPOP materials for selectively removing REEs (Eu 3+ , Gd 3+ , Tb 3+ , and Dy 3+ ) from aqueous solutions.…”

Section: Nanocomposite Polymersmentioning

confidence: 99%

Polymeric Materials for Rare Earth Elements Recovery

Zhang,

Gao

2023

Gels

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Rare earth elements (REEs) play indispensable roles in various advanced technologies, from electronics to renewable energy. However, the heavy global REEs supply and the environmental impact of traditional mining practices have spurred the search for sustainable REEs recovery methods. Polymeric materials have emerged as promising candidates due to their selective adsorption capabilities, versatility, scalability, and regenerability. This paper provides an extensive overview of polymeric materials for REEs recovery, including polymeric resins, polymer membranes, cross-linked polymer networks, and nanocomposite polymers. Each category is examined for its advantages, challenges, and notable developments. Furthermore, we highlight the potential of polymeric materials to contribute to eco-friendly and efficient REEs recovery, while acknowledging the need to address challenges such as selectivity, stability, and scalability. The research in this field actively seeks innovative solutions to reduce reliance on hazardous chemicals and minimize waste generation. As the demand for REEs continues to rise, the development of sustainable REEs recovery technologies remains a critical area of investigation, with the collaboration between researchers and industry experts driving progress in this evolving field.

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Novel benzylphosphate-based covalent porous organic polymers for the effective capture of rare earth elements from aqueous solutions

Cited by 37 publications

References 66 publications

Metal-Free Amine-Anchored Triazine-Based Covalent Organic Polymers for Selective CO₂ Adsorption and Conversion to Cyclic Carbonates Under Mild Conditions

Metal-Free Amine-Anchored Triazine-Based Covalent Organic Polymers for Selective CO₂ Adsorption and Conversion to Cyclic Carbonates Under Mild Conditions

Overview of Functionalized Porous Materials for Rare-Earth Element Separation and Recovery

Polymeric Materials for Rare Earth Elements Recovery

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Novel benzylphosphate-based covalent porous organic polymers for the effective capture of rare earth elements from aqueous solutions

Cited by 37 publications

References 66 publications

Metal-Free Amine-Anchored Triazine-Based Covalent Organic Polymers for Selective CO2 Adsorption and Conversion to Cyclic Carbonates Under Mild Conditions

Metal-Free Amine-Anchored Triazine-Based Covalent Organic Polymers for Selective CO2 Adsorption and Conversion to Cyclic Carbonates Under Mild Conditions

Overview of Functionalized Porous Materials for Rare-Earth Element Separation and Recovery

Polymeric Materials for Rare Earth Elements Recovery

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Product

Resources

About

Metal-Free Amine-Anchored Triazine-Based Covalent Organic Polymers for Selective CO₂ Adsorption and Conversion to Cyclic Carbonates Under Mild Conditions

Metal-Free Amine-Anchored Triazine-Based Covalent Organic Polymers for Selective CO₂ Adsorption and Conversion to Cyclic Carbonates Under Mild Conditions