Amidoximation of cross-linked polyacrylonitrile fiber and its highly selective gallium recovery from Bayer liquor

Zhang, Xueqin; Peng, Xuesong; Yang, Tuantuan; Zou, Huawei; Liang, Mei; Shi, Guangda; Yan, Wu

doi:10.1007/s00289-018-2551-3

Cited by 18 publications

(7 citation statements)

References 24 publications

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“…After amidoximation, the new NO stretching vibration peak appeared at 930 cm −1 , 41 and the CN stretching vibration increased while the cyano peak completely disappeared, indicating that the amidoximation of the gel was successful. After adsorption, the peak of NH stretching vibration at 3100–3500 cm −1 increased and shifted toward lower wavenumbers, while bending vibration at 1541 cm −1 was increased, showing that the amidoxime group had undergone alkaline hydrolysis in simulated Bayer liquor to form an amide group 42 . Also, a shift from 930 to 914 cm −1 was observed, which reflects the chelation between amidoxime groups and Ga 3+ 22 …”

Section: Resultsmentioning

confidence: 92%

“…After adsorption, the peak of N H stretching vibration at 3100-3500 cm −1 increased and shifted toward lower wavenumbers, while bending vibration at 1541 cm −1 was increased, showing that the amidoxime group had undergone alkaline hydrolysis in simulated Bayer liquor to form an amide group. 42 Also, a shift from 930 to 914 cm −1 was observed, which reflects the chelation between amidoxime groups and Ga 3+ . 22…”

Section: Ft-ir Analysismentioning

confidence: 89%

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Uniform macroporous amidoximated polyacrylonitrile monoliths for gallium recovery from Bayer liquor

Zhang

Peng

Shi

et al. 2020

J of Applied Polymer Sci

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Efficient recovery of gallium from aqueous solution remains a problem to be solved in industry. Here a novel crosslinked monolith based on polyacrylonitrile/dimethyl sulfoxide (C-PAN) was prepared by thermally induced phase separation and supercritical CO 2 extraction drying technology. The influences of dissolution temperature and exchange solvents with different solubility parameters on the pore structure of C-PAN were systematically studied. It was found that the pore diameter decreased with the decrease of dissolution temperature and the increase of Δδ between exchange solvent and PAN. Meanwhile, the C-PAN with a small and dense pore structure showed better mechanical strength. Thereafter, the Ga 3+ adsorption ability of amidoximated monolith (C-PAO) in simulated Bayer liquor was determined by batch tests. In the case of using methanol as the exchange solvent, the kinetic and equilibrium inspection study illustrated that both physical and chemical adsorption are present due to the multiscale and interconnected structure and the amidoxime groups. The adsorption capacity of C-PAO monolith toward gallium was 15.8 mg/g, with the equilibrium time as fast as 140 min, which can meet the requirement for the rapid extraction of gallium from Bayer liquor. It is expected that our work can provide some new ideas for fabricating gallium adsorbents.

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Section: Resultsmentioning

confidence: 92%

Section: Ft-ir Analysismentioning

confidence: 89%

Uniform macroporous amidoximated polyacrylonitrile monoliths for gallium recovery from Bayer liquor

Zhang

Peng

Shi

et al. 2020

J of Applied Polymer Sci

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“…In the IR spectrum of the gel (Figure S27, Supporting Information), the appearance of absorption signal at 1578 cm −1 indicates the formation of oxadiazole skeletons in the gel as a result of the occurrence of covalent bond ligation between 4 and nitrile groups in PAN. Because the conventional cross-linking reactions of nitrile-containing polymers need harsh conditions, [33,34] 4 might be regarded as a new type of cross-linker to improve the industrial processes of nitrilecontaining common polymers in the future.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Reactions of Homoditopic Stable Nitrile N‐Oxide as a Powerful Tool for Catalyst‐Free Constructions of Macromolecular Architectures

Ooba

Nakajima

Hamada

et al. 2022

Macro Chemistry & Physics

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Nitrile N-oxide is a highly reactive 1,3-dipole that undergoes 1,3-dipolar cycloaddition reactions to various dipolarophiles. However, the high reactivity of nitrile N-oxide leads to side reactions with nucleophiles and self-reactions, resulting in a decrease in the cycloadduct yield. The bulky substituent around nitrile N-oxide kinetically suppresses such undesirable side reactions, stabilizing nitrile N-oxide, and improving 1,3-dipolar cycloaddition efficiency. Homoditopic stable nitrile N-oxides as a ligation tool between unsaturated bonds are developed, although the challenge of the large-scale synthesis remains. Herein, the practical synthesis of a homoditopic stable nitrile N-oxide from bismaleimide is reported. Three simple steps, namely, Michael addition, oximation, and oxidation, produce the homoditopic nitrile N-oxide in 87% overall yield without purification process using column chromatography. The ligation capacity of nitrile N-oxide is discussed through polycycloadditions with several bisdipolarophiles and the cross-linking reaction of polyacrylonitrile.

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“…Gallium resources are an associated resource and are the byproduct of aluminum extraction from bauxite ores, (probably more 90%) or zinc extraction from zinc ores. , The waste Bayer solution, obtained from the seed mother liquor in the Bayer process to produce alumina, typically contains roughly 70% gallium, making it the most economical Ga resource with recovery value. , It has been reported that amidoxime chelating resin was beneficial to extracting gallium from the waste Bayer solution . Zheng et al studied the adsorption performance of commercial resin AO on gallium with a maximum adsorption effect of 28.26 mg/g .…”

Section: Introductionmentioning

confidence: 99%

Innovative Amidoxime Nanofiber Membranes for Highly Effective Adsorption of Ga(III) from Waste Bayer Solution

Qin

Liao

Wang

et al. 2023

Ind. Eng. Chem. Res.

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The effective treatment of Ga-containing wastewater from the Bayer process is a promising strategy for the sustainable development of the gallium resource. Among the adsorption materials, nanofibers play indispensable roles in the recovery of gallium with their adsorption capacity. However, developing facile, easy scale-up, and low-cost grafting methods for polyacrylonitrile nanofiber membranes (PAN NFs) is still challenging in view of the traditional grafting methods with lower grafting rates and strict requirement of fiber flexibility. In this study, a newly and highly efficient amidoxime nanofiber membrane preparation method with electrostatic spinning technology was explored to apply in the Ga(III) adsorption from Ga-containing wastewater. The results of Ga(III) adsorption studies by amidoxime polyacrylonitrile nanofiber membranes (AOPAN NFs) showed that Ga(III) was remarkably consistent with the Langmuir isotherm, with a maximum adsorption capacity of 39.80 mg/g of Ga(III) at 30 °C, a gallium concentration of 200 mg/L, a solid to liquid ratio of 1.0 mg/mL, and a solution pH of 12, which is generally higher than those of other materials. The kinetic adsorption experiment demonstrated that the adsorption process was controlled by a chemical reaction and followed the pseudo-second-order kinetic model. Furthermore, the adsorption mechanism of AOPAN NFs was proposed, and the oxime group played an essential role in the adsorption process. This strategy combines the advantages of AOPAN NFs to open up a new way to develop the next generation of gallium adsorption materials.

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Amidoximation of cross-linked polyacrylonitrile fiber and its highly selective gallium recovery from Bayer liquor

Cited by 18 publications

References 24 publications

Uniform macroporous amidoximated polyacrylonitrile monoliths for gallium recovery from Bayer liquor

Uniform macroporous amidoximated polyacrylonitrile monoliths for gallium recovery from Bayer liquor

Synthesis and Reactions of Homoditopic Stable Nitrile N‐Oxide as a Powerful Tool for Catalyst‐Free Constructions of Macromolecular Architectures

Innovative Amidoxime Nanofiber Membranes for Highly Effective Adsorption of Ga(III) from Waste Bayer Solution

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