Highly selective separation of dyes using compressed CO<sub>2</sub> and spherical polyelectrolyte brushes

Zhang, Rui; Yu, Zhenchuan; Cang, Yu; Hou, Xiaoyan; Shen, Zheqi; Deng, Jie; Zhou, Zhi; Guo, Xuhong; Wang, Junwei; Zhu, Xuedong

doi:10.1039/c5ra25876f

Cited by 4 publications

(2 citation statements)

References 44 publications

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“…SPBs not only possess many advantages originating from their special molecular structure, but also has a simple synthesis process [123,124] and easy-to-control molecular weight [125,126]. Therefore, SPBs have recently attracted worldwide research interest [127][128][129][130][131][132].…”

Section: Spherical Polyelectrolyte Brushesmentioning

confidence: 99%

Spherical Polyelectrolyte Brushes as Flocculants and Retention Aids in Wet-End Papermaking

2023

Molecules

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As the criteria of energy conservation, emission reduction, and environmental protection become more important, and with the development of wet-end papermaking, developing excellent retention aids is of great significance. Spherical polyelectrolyte brushes (SPBs) bearing polyelectrolyte chains grafted densely to the surface of core particle have the potential to be novel retention aids in wet-end papermaking not only because of their spherical structure, but also due to controllable grafting density and molecular weight. Such characteristics are crucial in order to design multi-functional retention aids in sophisticated papermaking systems. This review presents some important recent advances with respect to retention aids, including single-component system and dual-component systems. Then, basic theory in papermaking is also briefly reviewed. Based on these advances, it emphatically describes spherical polyelectrolyte brushes, focused on their preparation methods, characterization, conformation, and applications in papermaking. This work is expected to contribute to improve a comprehensive understanding on the composition, properties, and function mechanisms of retention aids, which helps in the further investigation on the design of novel retention aids with excellent performance.

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Section: Spherical Polyelectrolyte Brushesmentioning

confidence: 99%

Spherical Polyelectrolyte Brushes as Flocculants and Retention Aids in Wet-End Papermaking

2023

Molecules

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“…Recently, carbon dioxide (CO 2 ) has received considerable attention because it can obviously expand the organic solvent and change the properties of the solvent by simply tuning the operating pressure . Compressed CO 2 , as a gas antisolvent (GAS), could induce precipitation of a solute, which initially dissolved in the organic solvent. − The technique has been successfully exploited in various chemical industrial processes such as recrystallization, fractionation, extraction, , and fabrication of polymeric nanoparticles . Furthermore, CO 2 could decrease the dispersibility of ligand-stabilized metal nanoparticles, which induced the precipitation of nanoparticles .…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle Capture by Spherical Polyelectrolyte Brushes and Its Grading Separation Assisted by Compressed CO₂

Niu¹,

Lin²,

Zhou³

et al. 2019

Ind. Eng. Chem. Res.

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Spherical polyelectrolyte brushes (SPBs) could capture some charged nanoparticles, due to the Donnan effect, that have been verified as promising carriers for nanoparticles. However, how to separate the nanoparticles and recycle the expensive polymer brushes is still an obstacle in industrial applications. Compressed carbon dioxide (CO2) could work as a “pressure trigger” to regulate the properties of mixed solvents to accomplish the separation process because of its antisolvent effect. Herein, Ag nanoparticles were in situ synthesized in the spherical poly(acrylic acid) brushes with a polystyrene core (PS–PAA) and recovered easily by a suitable pressure of compressed CO2, while PS–PAA still remained in solution. After temperature quenching and depressurization, Ag nanoparticles could be collected with nearly 100% recovery ratio and narrow distribution. Moreover, further increased pressure could induce the aggregation of PS–PAA later, which could be employed to recycle the polymer brushes without any structure damage. This technique opens a novel and cost-effective way to enrich and separate the ionic material for industrial environmental engineering.

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Selective Adsorption and Separation of Organic Dyes with Spherical Polyelectrolyte Brushes and Compressed Carbon Dioxide

Zhang

Wang

et al. 2017

Chemistry A European J

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Dye-containing wastewater has caused serious environmental pollution. Herein, rationally designed spherical polyelectrolyte brushes (SPBs) with cationic charges, polystyrene-poly(2-aminoethylmethacrylate hydrochloride) (PS-PAEMH) as the absorbent, and compressed carbon dioxide as the antisolvent are proposed for the separation of the anionic dye eosin Y (EY) from a solution of mixed dyes. The adsorption behavior of EY onto PS-PAEMH was highly dependent on CO pressure, contact time, and initial concentration. The maximum adsorption capacity of PS-PAEMH was 335.20 mg g . FTIR and UV/Vis measurements proved that the electrostatic interactions between EY and PS-PAEMH played an important role in the absorbance process. The adsorption process fitted the pseudo-second-order kinetic model and Freundlich isotherm model very well. The combined dye and polymer brush could be easily separated through ion exchange by adding an aqueous solution of NaCl. Recovered PS-PAEMH retained a high adsorption capacity even after ten cycles of regeneration. This method provides a simple and effective way to separate ionic materials for environmental engineering.

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Highly selective separation of dyes using compressed CO₂ and spherical polyelectrolyte brushes

Abstract: The process of PS-PAA brush adsorbs dyes selectively and separates the aggregation assisted by the compressed CO2. With the help of NaCl solution, PS-PAA is regenerated and retains high adsorption capacity even after five times.

Cited by 4 publications

References 44 publications

Spherical Polyelectrolyte Brushes as Flocculants and Retention Aids in Wet-End Papermaking

Spherical Polyelectrolyte Brushes as Flocculants and Retention Aids in Wet-End Papermaking

Nanoparticle Capture by Spherical Polyelectrolyte Brushes and Its Grading Separation Assisted by Compressed CO₂

Selective Adsorption and Separation of Organic Dyes with Spherical Polyelectrolyte Brushes and Compressed Carbon Dioxide

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Highly selective separation of dyes using compressed CO2 and spherical polyelectrolyte brushes

Abstract: The process of PS-PAA brush adsorbs dyes selectively and separates the aggregation assisted by the compressed CO2. With the help of NaCl solution, PS-PAA is regenerated and retains high adsorption capacity even after five times.

Cited by 4 publications

References 44 publications

Spherical Polyelectrolyte Brushes as Flocculants and Retention Aids in Wet-End Papermaking

Spherical Polyelectrolyte Brushes as Flocculants and Retention Aids in Wet-End Papermaking

Nanoparticle Capture by Spherical Polyelectrolyte Brushes and Its Grading Separation Assisted by Compressed CO2

Selective Adsorption and Separation of Organic Dyes with Spherical Polyelectrolyte Brushes and Compressed Carbon Dioxide

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Product

Resources

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Highly selective separation of dyes using compressed CO₂ and spherical polyelectrolyte brushes

Nanoparticle Capture by Spherical Polyelectrolyte Brushes and Its Grading Separation Assisted by Compressed CO₂