Porous Covalent Organic Framework Based Hydrogen‐Bond Nanotrap for the Precise Recognition and Separation of Gold

Qiu, Jikuan; Xu, Chang; Xu, Xianhui; Zhao, Yingjie; Zhao, Yang; Zhang, Xiaochen; Wang, Jianji

doi:10.1002/ange.202300459

Cited by 19 publications

(3 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The successful reaction between the hydrazide and the aldehyde was confirmed by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy (Figure a,b). The C 1s signal of COF-42 film matches the reported literature, , showing a distinct signal of CN found only present in the reacted COF linkage. Additionally, the O 1s and N 1s XPS signals found in S5a and S5b also agree with the reported literature, showing a relatively high amount of O–C bonds compared to the number of OC bonds, as well as a broad nitrogen signal indicating the presence of both N–C and NC bonds.…”

Section: Resultsmentioning

confidence: 99%

Solutions Are the Problem: Ordered Two-Dimensional Covalent Organic Framework Films by Chemical Vapor Deposition

Daum,

Ajnsztajn,

Iyengar

et al. 2023

ACS Nano

View full text Add to dashboard Cite

Covalent organic frameworks (COFs) are a promising class of crystalline polymer networks that are useful due to their high porosity, versatile functionality, and tunable architecture. Conventional solution-based methods of producing COFs are marred by slow reactions that produce powders that are difficult to process into adaptable form factors for functional applications, and there is a need for facile and fast synthesis techniques for making crystalline and ordered covalent organic framework (COF) thin films. In this work, we report a chemical vapor deposition (CVD) approach utilizing co-evaporation of two monomers onto a heated substrate to produce highly crystalline, defect-free COF films and coatings with hydrazone, imine, and ketoenamine COF linkages. This all-in-one synthesis technique produces highly crystalline, 40 nm–1 μm-thick COF films on Si/SiO2 substrates in less than 30 min. Crystallinity and alignment were proven by using a combination of grazing-incidence wide-angle X-ray scattering (GIWAXS) and transmission electron microscopy (TEM), and successful conversion of the monomers to produce the target COF was supported by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and UV–vis measurements. Additionally, we used atomic force microscopy (AFM) to investigate the growth mechanisms of these films, showing the coalescence of triangular crystallites into a smooth film. To show the wide applicability and scope of the CVD process, we also prepared crystalline ordered COF films with imine and ketoenamine linkages. These films show potential as high-quality size exclusion membranes, catalytic platforms, and organic transistors.

show abstract

Section: Resultsmentioning

confidence: 99%

Solutions Are the Problem: Ordered Two-Dimensional Covalent Organic Framework Films by Chemical Vapor Deposition

Daum,

Ajnsztajn,

Iyengar

et al. 2023

ACS Nano

View full text Add to dashboard Cite

show abstract

“…However, due to low porosity and insufficient functional groups, their practical applications suffer from poor adsorption capacity, slow adsorption kinetics, and weak selectivity. Recently, porous organic polymers (POPs) with the advantages of high porosity, environmental stability, and flexible functionalization have attracted more and more attention and are believed to be the qualified candidates for adsorbents. − Microporous polyureas (mPPUs) are a family of porous polymers with polar urea (−NHCONH−) linkages, which are typically prepared by condensation reaction between diisocyanate and triamine building blocks. , The microporosity of mPPUs is usually formed by the cross-linked aromatic backbone and the associated defects owing to the unreacted side groups, sharing their substrates with dual merits of accelerated mass transfer process and abundant adsorption sites. With the advantages mentioned above, mPPUs have been extensively used in metal enrichment, heterogeneous catalysis, water purification, etc .…”

Section: Introductionmentioning

confidence: 99%

Solvothermal Preparation of Microporous Polyureas for Au(III) Adsorption

Lin,

Chen,

Lei

et al. 2024

Langmuir

View full text Add to dashboard Cite

The enrichment and recovery of gold from wastewater are an alternative method to obtain this noble metal, which benefits reducing hazardous emissions from the conventional ore mining process and reserving natural gold for sustainable development. Inspired by our previous work (Lei et al., Macromol. Rapid Comm. 2022, 2200712), four families of microporous polyureas (mPPUs) with a large surface area (690 m2 g–1) and abundant heteroatom sites have been prepared via the factor-optimized solvothermal protocol. The resultant sample NPU-A starting from 1,5-naphthalene diisocyanate (NDI) and tri(4-aminophenyl) amine (TAPA) exhibits the maximum Au(III) adsorption capacity of 1300 mg g–1 and high selectivity even when the Au(III) concentration is as low as 0.1 mg L–1. This study not only demonstrates the robustness of the high-throughput synthetic strategy but also promotes the investigation of the structure–activity correlation between the mPPU chemical structure and Au(III) adsorption performance.

show abstract

“…A pivotal aspect involves the adept handling of metals to bolster resource recycling 2 , 3 . In this context, the valorization of waste materials emerges as a pivotal element for the world-wide circular economy 4 – 6 . This strategy offers dual benefits: the purification of waste, leading to a subsequent reduction in the overall toxicity of disposables, and the retrieval of metals that would otherwise contribute to the composition of waste materials 7 – 10 .…”

Section: Introductionmentioning

confidence: 99%

Exploring the feasibility of Zr-based metal–organic frameworks for the recovery of Sb (V) and Sb (III) from mining waste

Bu,

Yang,

Zhang

et al. 2024

Sci Rep

View full text Add to dashboard Cite

The present study investigates the efficacy of newly developed Zr-based metal–organic frameworks, specifically MIP-206, and its amine-modified counterpart, MIP-206-NH2, for the re-covery of antimony (Sb) from both synthetic and actual mining wastewater. Batch method studies were employed to examine the effect of waste media pH, Sb concentration, process kinetics, and the performance of the regeneration solution. MIP-206-NH2 exhibited impressive separation capabilities, achieving 102.18 mg/g and 63.23 mg/g for Sb (V) and Sb (III), respectively. In contrast, the pristine MIP-206 reached maximum values of 26.26 mg/g for Sb (V) and 16.95 mg/g for Sb (III). The separation process was well-described by the Langmuir equation, and the kinetics followed the pseudo-second-order model. Although the amine modification resulted in a decrease in the surface area of MIP-206 from 1345.21 to 1169.86 m2/g, SEM and XRD analyses confirmed that the structural integrity of MIP-206-NH2 remained unchanged. In terms of reusability, MIP-206-NH2 maintained up to 90% of its separation performance over 9 cycles, while MIP-206 demonstrated effectiveness for 7 cycles. The regeneration solution exhibited a capacity of approximately 0.63 mol/L for Sb (V) and 0.71 mol/L for Sb (III). Furthermore, MIP-206 and MIP-206-NH2 demonstrated successful application in selectively separating Sb from real mining wastewater.

show abstract

Porous Covalent Organic Framework Based Hydrogen‐Bond Nanotrap for the Precise Recognition and Separation of Gold

Cited by 19 publications

References 59 publications

Solutions Are the Problem: Ordered Two-Dimensional Covalent Organic Framework Films by Chemical Vapor Deposition

Solutions Are the Problem: Ordered Two-Dimensional Covalent Organic Framework Films by Chemical Vapor Deposition

Solvothermal Preparation of Microporous Polyureas for Au(III) Adsorption

Exploring the feasibility of Zr-based metal–organic frameworks for the recovery of Sb (V) and Sb (III) from mining waste

Contact Info

Product

Resources

About