Hyperbranched polyethyleneimine for high-effective oil-water separation

Huang, Yu; Zhang, Lifeng; Zhan, Ningning; Teng, Houkai; Zhou, Lishan; Zhao, Jianmin; Fang, Wenjun

doi:10.1016/j.petrol.2022.110403

Cited by 10 publications

(1 citation statement)

References 29 publications

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“…In Figure 2 a, the 1 H NMR spectrum of PEI displays a signal ranging from 2.50 to 3.00 ppm, representing the characteristic broad resonance associated with branched groups, including methylene groups (N–CH 2 , CH 2 –NH–CH 2 , and CH 2 –NH 2 ). Proton peaks corresponding to amine groups are evident from 1.10 to 2.10 ppm, encompassing –NH 2 and CH 2 –NH–CH 2 [ 18 , 43 ]. Additionally, solvent hydrogens exhibit a singular peak at approximately 7.27 ppm.…”

Section: Resultsmentioning

confidence: 99%

Nitrophenyl Thiourea-Modified Polyethylenimine Colorimetric Sensor for Sulfate, Fluorine, and Acetate

Kuerbanjiang,

Rouzi,

Zhang

2024

Sensors

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A thiourea-based colorimetric sensor incorporating polyethyleneimine (PEI) and chromophoric nitrophenyl groups was synthesized and utilized for detecting various anions. Structural characterization of the sensor was accomplished using FTIR and 1H-NMR spectroscopy. The sensor’s interactions and colorimetric recognition capabilities with different anions, including CI−, Br−, I−, F−, NO3−, PF6−, AcO−, H2PO4−, PO43−, and SO42−, were investigated via visual observation and UV/vis spectroscopy. Upon adding SO42−, F−, and AcO− anions, the sensor exhibited distinct color changes from colorless to yellow and yellowish, while other anions did not induce significant color alterations. UV/vis spectroscopic titration experiments conducted in a DMSO/H2O solution (9:1 volume ratio) demonstrated the sensor’s selectivity toward SO42−, F−, and AcO−. The data revealed that the formation of the main compounds and anion complexes was mediated by hydrogen bonding, leading to signal changes in the nitrophenyl thiourea-modified PEI spectrum.

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Section: Resultsmentioning

confidence: 99%