Demulsification of oily wastewater using a nano carbon black modified with polyethyleneimine

Chen, Lihan; Fan, Ye; Liu, Hanjun; Jiang, Xuebin; Qing-mei, Zhao; Ai, Guosheng; Shen, Liwei; Feng, Xuening; Yang, Ying; Mi, Yuanzhu

doi:10.1016/j.chemosphere.2022.133857

Cited by 22 publications

(2 citation statements)

References 33 publications

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“…The middle PDA layer and positively charged PEI shell assembled into a bright ultrathin shell (10 nm) in the periphery of the Fe 3 O 4 core ( Figure 3 b), for further electrostatic adherence of negatively charged bacteria. In practical applications, magnetic materials must possess enough magnetism to guarantee rapid separation from liquid [ 35 ]. Therefore, we tested the magnetism of Fe 3 O 4 @PDA@PEI MBs at room temperature by vibrating the sample magnetometer ( Figure 3 c).…”

Section: Resultsmentioning

confidence: 99%

Fe3O4@PDA@PEI Core-Shell Microspheres as a Novel Magnetic Sorbent for the Rapid and Broad-Spectrum Separation of Bacteria in Liquid Phase

Zhang¹,

Du²,

Wu³

et al. 2022

Materials

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Bacterial infection is a significant cause of morbidity and mortality to humans worldwide. Thus, a method for nonspecific, sensitive, and rapid enrichment of such bacteria is essential for bacteria detection and treatment. This study demonstrates a self-made core-shell Fe3O4@Polydopamine@Polyethyleneimine magnetic beads (Fe3O4@PDA@PEI MBs) with a high density positive charge-based magnetic separation scheme for the broad-spectrum rapid enrichment of microorganisms in the liquid phase. MBs with a high-density positive charge have a strong electrostatic attraction to most microorganisms in nature. Our scheme is as follows: (1) wrapping dopamine (DA) on the iron oxide through self-polymerization and wrapping PEI on the outermost shell layer in a mode of crosslinking with the PDA; (2) subsequently, the Fe3O4@PDA@PEI MBs were used to concentrate microorganisms from the sample solution; (3) performing magnetic separation and calculating the adsorption efficiency. The as-prepared Fe3O4@PDA@PEI MBs composite was carefully characterized by zeta potential analysis, Value stream-mapping (VSM), transmission electron microscopy (TEM), and Fourier transforms infrared spectrometry (FT-IR). In this study, both gram-positive and gram-negative bacteria could be captured in three minutes through electrostatic interaction. Furthermore, the adsorption efficiency on gram-negative (>98%) is higher than that on gram-positive (>95%), allowing for a simple, rapid assay to enrich organisms in resource-limited settings.

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Section: Resultsmentioning

confidence: 99%

Fe3O4@PDA@PEI Core-Shell Microspheres as a Novel Magnetic Sorbent for the Rapid and Broad-Spectrum Separation of Bacteria in Liquid Phase

Zhang¹,

Du²,

Wu³

et al. 2022

Materials

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“…In the FTIR spectrum of h-PAMAM, the absorption peak of 2931 cm −1 and 2835 cm −1 are the asymmetric and symmetric stretching vibrations of -CH 2 , respectively. The typical absorption peak of amido groups (RCONH 2 ) appears at 1640 cm −1 ; the stronger absorption band of 3284 cm −1 is the amino groups [37]. However, in the FTIR spectrum of JXGZ, 1668 cm −1 is the absorption peak of the amido groups; the peak at 3284 cm −1 may be an overlap of the amino and hydroxyl groups [38].…”

Section: Characterization and Analysis Of Demulsifiersmentioning

confidence: 99%

A Novel Demulsifier with Strong Hydrogen Bonding for Effective Breaking of Water-in-Heavy Oil Emulsions

Xia,

Ma,

Liu

et al. 2023

IJMS

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In the heavy petroleum industry, the development of efficient demulsifiers for the effective breaking of interfacially active asphaltenes (IAA)-stabilized water-in-heavy oil (W/HO) emulsions is a highly attractive but challenging goal. Herein, a novel nitrogen and oxygen containing demulsifier (JXGZ) with strong hydrogen bonding has been successfully synthesized through combining esterification, polymerization and amidation. Bottle tests indicated that JXGZ is effectual in quickly demulsifying the IAA-stabilized W/HO emulsions; complete dehydration (100%) to the emulsions could be achieved in 4 min at 55 °C using 400 ppm of JXGZ. In addition, the effects of demulsifier concentration, temperature and time on the demulsification performance of JXGZ are systematically analyzed. Demulsification mechanisms reveal that the excellent demulsification performance of JXGZ is attributed to the strong hydrogen bonding between JXGZ and water molecules (dual swords synergistic effect under hydrogen bond reconstruction). The interaction of the “dual swords synergistic effect” generated by two types of hydrogen bonds can quickly break the non-covalent interaction force (π-π stacking, Van der Waals force, hydrogen bonds) of IAA at the heavy oil–water interface, quickly promote the aggregation and coalescence of water molecules and finally achieve the demulsification of W/HO emulsions. These findings indicate that the JXGZ demulsifier shows engineering application prospects in the demulsification of heavy oil–water emulsions, and this work provides the key information for developing more efficient chemical demulsifiers suitable for large-scale industrial applications.

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Factors influencing demulsification of refinery oily sludge via ultrasonic treatment

Song,

Ren,

Wang

et al. 2024

Chemical Engineering and Processing - Process Intensification

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Demulsification of oily wastewater using a nano carbon black modified with polyethyleneimine

Cited by 22 publications

References 33 publications

Fe3O4@PDA@PEI Core-Shell Microspheres as a Novel Magnetic Sorbent for the Rapid and Broad-Spectrum Separation of Bacteria in Liquid Phase

Fe3O4@PDA@PEI Core-Shell Microspheres as a Novel Magnetic Sorbent for the Rapid and Broad-Spectrum Separation of Bacteria in Liquid Phase

A Novel Demulsifier with Strong Hydrogen Bonding for Effective Breaking of Water-in-Heavy Oil Emulsions

Factors influencing demulsification of refinery oily sludge via ultrasonic treatment

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