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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY · 2025 · IF 1.6

Preparation of amidoxime and polyamine bifunctional modified wet-spun polyacrylonitrile–polyamidoxime fibers for adsorption of U(VI) from aqueous solution

Gui Yunyang,Ruan Hui,Wang Haitao,Li Tiantian,Liu Yanrui,He Teng,Xue Yun,Ma Fuqiu,Liu Peng

A novel amidoxime and polyamine bifunctional modified polyacrylonitrile-polyamidoxime-based fiber adsorbent (PAN-PAO-NH 2 -AO) was prepared using wet-spun and hydrothermal methods. The structure, morphology, and properties of the fibers were characterized by various methods to demonstrate the attachment of amidoxime and polyamine groups onto the fibers. The highest adsorption capacity of the material reached 236.3 mg/g at pH 5 and 298 K. The study of the adsorption mechanism of the fibers showed that the lone pair of electrons of the N and O atoms coordinated with U(VI) by XPS. The results show that PAN-PAO-NH 2 -AO fibers are a potential decontamination material for uranium-containing wastewater.

CAS / MDL: 7697-37-2

研究领域: 材料科学 · 环境科学

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APPLIED SURFACE SCIENCE · 2023 · IF 6.7

Molecular mechanisms of pyrophosphate-mediated selective adsorption of Ni(II) by polyamine-grafted chitosan–wood flour composite from alkaline plating wastewater: EXAFS investigation and theoretical calculations

Chen Ling,Zhengxiao Wang,Yixuan Song,Lichun Fu,Yanhong Zhang,Weinan Wang,Weinan Xing,Jiangang Han

The efficient removal of complexed heavy metals (HMs) from alkaline electroless plating wastewater is still challenging. A polyamine-grafted chitosan–wood flour-based composite (ACS-AWF) was optimally synthesized. Its adsorption behavior toward Ni(II) in simulated pyrophosphate (PP, the main complextant)–Ni plating wastewater and underlying mechanisms were examined. PP considerably promoted Ni(II) adsorption by up to 108.1%, and the enhancement tolerated excess PP or other substances. Ni(II) adsorption by ACS-AWF was 1.38–∼10 times that of several commercial HM-favored resins in the same complexed system. According to the liquid solute species tracking, solid chemical characterizations (eg. synchrotron radiation X-ray adsorption spectroscopy), and theoretical calculations, it was found that Ni(II), primarily as NiP 2 O 7 2− , could be captured by charge-assistant coordination with the surface polyamine. Then, the coadsorption of PP altered the interface properties via both electrostatic shielding and bridging effect, enhancing Ni(II)–amine coordination efficiency. A dinuclear multilayer coordination structure [-amine–Ni–PP–Ni–amine-] was proposed as the dominant Ni(II) binding mode in the presence of PP. Ni(II) and PP could be sequentially desorbed from ACS-AWF using gradient elution with ＞95.5% Ni(II) purity. ACS-AWF was then stably reused in five cycles (capacity loss ＜10%). These results may guide adsorbent design and application in HM purification and recycling from complexed wastewater.

CAS / MDL: 68-12-2 9002-98-6 106-89-8

研究领域: 环境科学 · 材料科学 · 化学工程

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Preparation of amidoxime and polyamine bifunctional modified wet-spun polyacrylonitrile–polyamidoxime fibers for adsorption of U(VI) from aqueous solution

Molecular mechanisms of pyrophosphate-mediated selective adsorption of Ni(II) by polyamine-grafted chitosan–wood flour composite from alkaline plating wastewater: EXAFS investigation and theoretical calculations