Multidentate thia-crown ethers as hyper-crosslinked macroporous adsorbent resins for the efficient Pd/Pt recovery and separation from highly acidic spent automotive catalyst leachate

Torrejos, Rey Eliseo C.; Escobar, Erwin C.; Han, Jeong Woo; Min, Sang Hoon; Yook, Hyunwoo; Parohinog, Khino J.; Koo, Sangho; Kim, Hern; Nisola, Grace M.; Chung, Wook–Jin

doi:10.1016/j.cej.2021.130379

Cited by 30 publications

(3 citation statements)

References 55 publications

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“…Toward sustainable epoxy chemistry and technology, research on biobased epoxies has achieved significant progress in recent years. , In particular, exploiting biobased bisphenol alternatives for BPA will play a key role in promoting the sustainability of epoxies in the future. As shown in Scheme S1, a few naturally occurring bisphenols or diphenols bearing two phenolic hydroxyl groups including magnolol, − protocatechuic acid, , catechin, daidzein, − etc. have been directly used to synthesize various curable epoxies by reacting with ECH.…”

Section: Introductionmentioning

confidence: 99%

Scalable Synthesis of Thymol-Based Bisphenol E Epoxy Monomer and Related Thermosets with Low Dielectric Constant and Density and Improved Resistance to Hygrothermal Aging

Li,

Hao

et al. 2024

ACS Appl. Polym. Mater.

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Epoxy resins coming from biobased bisphenols have received significant attention; however, thymol-derived bisphenol epoxies are still essentially unknown so far. Here, a biobased bisphenol E (DHPF) intermediate was obtained from thymol and acetaldehyde via a highly efficient approach, followed by O-glycidylation to afford a bisphenol E epoxy monomer (DHEP) with a viscosity of only 3.5 Pa·s at 60 °C identical to that of a bisphenol A epoxy (DGEBA). Using 4,4′-diaminodiphenyl sulfone (44DDS) and methyltetrahydrophthalic anhydride (MTHPA) as curatives, cured DHEP thermosets were prepared through cast molding, and their properties are systematically studied and compared with DGEBA thermosets. DHEP delivers a lower dielectric constant to the resulting thermosets, especially for DHEP/MTHPA (1.9, 10 MHz). The DHEP-based thermoset also exhibits decreased water absorption, density, and thermal diffusivity and improved resistance to hygrothermal aging as indicated by storage modulus and T g retention, and good bulk mechanical properties. Moreover, when formulated into an epoxy adhesive for bonding stainless steel sheets, DHEP endows the glue joint with a rather high lap shear strength up to 12.7 MPa. Overall, DHPF can be readily prepared in large quantities, and DHEP is potentially 100% biobased with good processability; the finalized DHEP thermosets have advantages in many properties of high interest, thereby illustrating its good prospects for real applications.

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Section: Introductionmentioning

confidence: 99%

Scalable Synthesis of Thymol-Based Bisphenol E Epoxy Monomer and Related Thermosets with Low Dielectric Constant and Density and Improved Resistance to Hygrothermal Aging

Li,

Hao

et al. 2024

ACS Appl. Polym. Mater.

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“…Among these, adsorption offers advantages in terms of effectiveness, simplicity, cost-effectivity, and reusability. Several adsorbents have been studied as potential candidates for removing PGMs from water and wastewater media, 6–22 but only a few demonstrate high selectivity, solution stability, and excellent repeatability. 8,10,11,15,19–22 Therefore, there is a need to design advanced novel materials that fulfill essential criteria, such as easy fabrication, high affinity, excellent selectivity, rapid kinetics, high acid-stability, and proficient repeatability.…”

Section: Introductionmentioning

confidence: 99%

“…This highlights its superiority in terms of both the amount of uptake and the acid-stability compared to previously reported adsorbents. 6–22 The prepared POSS–S–COOH underwent comprehensive characterization using various analytical techniques, including 13 C nuclear magnetic resonance ( 13 C NMR), 29 Si NMR, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), zeta potential measurement, energy dispersive spectroscopy (EDS), BET isotherm, field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The study also included investigations on the pH influence, adsorption isotherm, kinetic, and thermodynamic aspects using POSS–S–COOH with PdCl 4 2− and PtCl 6 2− to determine the optimized conditions, maximum adsorption efficacy, equilibrium time, and the nature of adsorption.…”

Section: Introductionmentioning

confidence: 99%

Single-step synthesis of prominently selective and easily regenerable POSS functionalized with high loadings of sulfur and carboxylic acids

Chaudhuri,

Lim,

Yun

2023

J. Mater. Chem. A

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New Progresses in Efficient, Selective, and Environmentally Friendly Recovery of Valuable Metal from e‐Waste and Industrial Catalysts

Zheng,

Yang,

Chen

et al. 2024

Advanced Sustainable Systems

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Recycling metals from waste materials has become a major approach to metal resource utilization, with electronic waste (e‐waste) and waste catalysts being the most important recycling resources. Although traditional recovery technologies (pyrometallurgy and hydrometallurgy) have a recovery efficiency of up to 100%, they have disadvantages of high energy consumption, high cost, and strong corrosiveness. Most importantly, they cannot achieve selective leaching. To address these issues, some fusion technologies have been developed. Electrodeposition has significant advantages in separating and purifying each metal, but if applied on a large scale in industry, it requires higher energy consumption. While photocatalytic technology has low energy consumption but low selectivity, hence further exploration is needed. Metal‐organic frameworks (MOFs) materials have great selectivity for metal ions, which are environmentally friendly and efficient, and a promising new material. Some recently typical recovery methods for six valuable metals, platinum (Pt), gold (Au), silver (Ag), lithium (Li), nickel (Ni), and cobalt (Co) in e‐waste and industrial catalysts are reviewed. The advantages and disadvantages of each method as well as their impact on the leaching efficiency and selectivity of different metals are also compared, aiming to provide useful guidance for further continuously advancing the research on efficient, selective, environmentally friendly metal recycling in the future.

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Multidentate thia-crown ethers as hyper-crosslinked macroporous adsorbent resins for the efficient Pd/Pt recovery and separation from highly acidic spent automotive catalyst leachate

Cited by 30 publications

References 55 publications

Scalable Synthesis of Thymol-Based Bisphenol E Epoxy Monomer and Related Thermosets with Low Dielectric Constant and Density and Improved Resistance to Hygrothermal Aging

Scalable Synthesis of Thymol-Based Bisphenol E Epoxy Monomer and Related Thermosets with Low Dielectric Constant and Density and Improved Resistance to Hygrothermal Aging

Single-step synthesis of prominently selective and easily regenerable POSS functionalized with high loadings of sulfur and carboxylic acids

New Progresses in Efficient, Selective, and Environmentally Friendly Recovery of Valuable Metal from e‐Waste and Industrial Catalysts

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