Amidoxime-Schiff base synergistic coordination and skeleton structure modification to construct porous polymer adsorbent materials for highly selective adsorption of uranium(VI)

Author: Peng, Xiujing ; Liu, Yifan ; Cui, Yu ; Yuan, Xiaoying ; Li, Tianrui ; Sun, Guoxin ; Zhang, Miaomiao

Large-scale uranium extraction from seawater (UES) is considered to be an important way to solve the nuclear fuel shortage, and the development of highly efficient and selective adsorbents is a key factor in realizing UES.In this work, Schiff base-conjugated amidoxime modified porous organic polymers (OPA-PPA-AO) were synthesized by aldehyde-amine condensation and hydroxylamine reactions for the adsorption of uranium.OPA-PPA-AO demonstrates exceptional adsorption selectivity and high adsorption capacity, with an adsorption capacity for uranium that is 53 times greater than that for vanadium.The maximal adsorption capacity of OPA-PPA-AO reaches 316.14 mg/g.In real seawater, the removal rate of uranium by OPA-PPA-AO was 63.5 %.Mechanistic studies and theor. calculations showed that the unique skeletal structure of OPA-PPA-AO provided a suitable structural environment for the synergistic coordination of Schiff bases and amidoxime groups, which led to the high affinity to uranyl ion.These results indicate that OPA-PPA-AO is a very promising material for uranium extraction from seawater.

01 Jun 2025·Applied Catalysis B: Environment and Energy

Positionally isomeric conjugated polymers for photosynthesis of hydrogen peroxide through triphase interface reaction

Author: Liu, Xinru ; Mao, Shun ; Yao, Ducheng ; Chen, Zhong ; Chu, Chengcheng ; Ran, Xiaomeng

Tuning the constituent units with distinct features in polymer structure has always been a hot topic in organic photocatalyst design and construction.However, how the positionally isomeric heterostructure influences the optoelectronic structure and electron transfer ability of the catalyst in photocatalytic H₂O₂ synthesis is largely unknown.In this work, we report three positionally isomeric (ortho-, meta-, or para-positions) polymer catalysts that are structurally similar but have significantly different photocatalytic properties.Among the three positionally isomeric conjugated polymers, the meta-Schiff base polymer (m-SBP) achieves the greatest H₂O₂ production efficiency (717.5 μmol L^-1 g^-1) than the other two isomeric polymers in pure water without sacrificial agent.The mechanism investigation indicates that isomer engineering can effectively alter the charge distribution and charge transfer capabilities of a polymer catalyst.Moreover, to overcome the limitation of slow oxygen diffusion in water, the catalyst is loaded on hydrophobicity carbon paper to form a triphase interface (gas-liquid-solid), which presents 3.3 times higher H₂O₂ production rate than that in a diphase system (liquid-solid).This study reports the promise of using isomer engineering to boost the catalytic activity of polymer catalyst, and offers new inspiration to construct sustainable H₂O₂ production system by solar energy with triphase interface design.

21 Apr 2025·Spectroscopy Letters

Spectrofluorimetric detection of bacitracin zinc in different water samples based on its derivatization with o-phthalaldehyde and 2-mercaptoethanol

Author: Darwish, Ibrahim A. ; Abdel-Lateef, Mohamed A. ; El-Koussi, Wesam M. ; H. Othman, Mahmoud

A novel, uncomplicated, and sensitive spectrofluorimetric method was designed for the quant. determination of bacitracin zinc in different water samples.This method depends on the proficient reaction of the primary amino group of bacitracin zinc with O-phthalaldehyde and 2-mercaptoethanol reagents in Teorell & Stenhagen buffer (in alk. medium) producing fluorescent derivative with high intensity, which is determined at 436.5 nm with an excitation wavelength of 342.5 nm.The optimal exptl. conditions influencing the derivatized product were cautiously studied and optimized.Under the optimized conditions, a linear relationship with an excellent correlation coefficient (0.9995) was found between the fluorescence intensity of the fluorophore and bacitracin zinc concentration in the range of 0.75-4.00 μg/mL.In addition, the limits of quantitation and detection for the developed method were 0.39 and 0.13 μg/mL, resp.The accuracy and precision of the method were satisfactory; the values of recovery were in the range of 98.38-102.03%, and the relative standard deviations did not exceed 2.17%.The established method was employed effectively for bacitracin zinc determination in different water samples, which makes it a valuable concern for practical and rational quality control investigations of the studied drug.

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