Synthesis of chitosan-based grafting magnetic flocculants for flocculation of kaolin suspensions

Liu, Chuang; Wang, Xiaoyu; Du, Sicong; Liang, Wenyan

doi:10.1016/j.jes.2023.05.031

Cited by 13 publications

(4 citation statements)

References 44 publications

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“…FS@CTS-P(AM-DMC) was synthesized using the free radical copolymerization methods described in our previous work [34]. Briefly, FeCl 3 •6H 2 O and FeCl 2 •4H 2 O were used as the precursors to synthesize Fe 3 O 4 nanoparticles.…”

Section: Synthesis Of Fs@cts-p(am-dmc)mentioning

confidence: 99%

“…Drawing from our previous study, a cationic magnetic flocculant, named FS@CTS-P(AM-DMC), achieved a remarkable separation effectiveness in high-turbidity kaolin wastewater. Here, Fe 3 O 4 @SiO 2 (abbreviated as FS) served as the magnetic core, while chitosan (CTS), acrylamide (AM), and methacryloyloxyethyl trimethyl ammonium chloride (DMC) acted as the cationic functional layer [34]. This cationic layer boasted a high relative molecular weight, positive charge density, and long graft chain, all of which contributed to its effectiveness.…”

Section: Introductionmentioning

confidence: 99%

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Chitosan-Based Grafted Cationic Magnetic Material to Remove Emulsified Oil from Wastewater: Performance and Mechanism

Du,

Liu,

Cheng

et al. 2024

Processes

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In order to remove high-concentration emulsified oil from wastewater, a chitosan-based magnetic flocculant, denoted as FS@CTS-P(AM-DMC), was employed in this present study. The effects of factors including the magnetic flocculant dose, pH values, and coexisting ions were investigated. A comparative dosing mode with the assistance of polyacrylamide (PAM) was also included. The evolution of floc size was studied using microscopic observation to investigate the properties of flocs under different pH values and dosing modes. Particle image velocimetry (PIV) and extended Deryaguin–Landau–Verwey–Overbeek models were utilized to illustrate the distribution and velocity magnitude of the particle flow fields and to delve into the mechanism of magnetic flocculation. The results showed that FS@CTS-P(AM-DMC) achieved values of 96.4 and 74.5% for both turbidity and COD removal for 3000 mg/L of simulated emulsified oil. In the presence of PAM, the turbidity and COD removal reached 95.7 and 71.6%. In addition, FS@CTS-P(AM-DMC) demonstrated remarkable recycling and reusability performances, maintaining effective removal after eight cycles. The strength and recovery factors of magnetic flocs without PAM reached 69.3 and 76.8%, respectively. However, with the addition of PAM, they decreased to 46.73 and 51.47%, respectively. During the magnetophoretic processes, FS@CTS-P(AM-DMC) and oil droplets continuously collided and aggregated, forming three-dimensional network aggregates. Moreover, the magnetic floc generated a swirling motion, and the residual emulsified oil droplets could be further captured. Emulsified oil droplets were primarily removed through charge neutralization under acidic conditions. Under neutral and alkaline conditions, magnetic interactions played a major role in magnetic flocculation.

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Section: Synthesis Of Fs@cts-p(am-dmc)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chitosan-Based Grafted Cationic Magnetic Material to Remove Emulsified Oil from Wastewater: Performance and Mechanism

Du,

Liu,

Cheng

et al. 2024

Processes

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“…This is generally achieved through porous materials. Although other methods such as coagulation [ 18 ], flocculation [ 19 ], and biological methods [ 20 ] have been employed for wastewater treatment, porous materials are less complicated and easier to use [ 4 ]. Porous materials are compounds that have pores with interactive sites in their structure.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Porous Bio-Polymer Composites for the Remediation of Organic Pollutants

Tadayoni,

Dinari,

Roy

et al. 2024

Polymers

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The increasing awareness of the importance of a clean and sustainable environment, coupled with the rapid growth of both population and technology, has instilled in people a strong inclination to address the issue of wastewater treatment. This global concern has prompted individuals to prioritize the proper management and purification of wastewater. Organic pollutants are very persistent and due to their destructive effects, it is necessary to remove them from wastewater. In the last decade, porous organic polymers (POPs) have garnered interest among researchers due to their effectiveness in removing various types of pollutants. Porous biopolymers seem to be suitable candidates among POPs. Sustainable consumption and environmental protection, as well as reducing the consumption of toxic chemicals, are the advantages of using biopolymers in the preparation of effective composites to remove pollutants. Composites containing porous biopolymers, like other POPs, can remove various pollutants through absorption, membrane filtration, or oxidative and photocatalytic effects. Although composites based on porous biopolymers shown relatively good performance in removing pollutants, their insufficient strength limits their performance. On the other hand, in comparison with other POPs, including covalent organic frameworks, they have weaker performance. Therefore, porous organic biopolymers are generally used in composites with other compounds. Therefore, it seems necessary to research the performance of these composites and investigate the reasons for using composite components. This review exhaustively investigates the recent progress in the use of composites containing porous biopolymers in the removal of organic pollutants in the form of adsorbents, membranes, catalysts, etc. Information regarding the mechanism, composite functionality, and the reasons for using each component in the construction of composites are discussed. The following provides a vision of future opportunities for the preparation of porous composites from biopolymers.

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“…Magnetic separation, due to its simplicity, low energy consumption, and cost-effectiveness, has found wide application in diverse water treatment processes. It has proven to be effective and reliable in various applications, such as kaolin removal, wastewater treatment in steel factories, mineral beneficiation for ore enrichment, dye wastewater decolorization, and the removal of metals like lead and copper from water [10][11][12]. Additionally, magnetic separation has found utility in biochemical processes, including cell separation, protein and DNA purification, and biocatalysis [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Application of Magnetic Composites Using Controllable Assembly for Use in Water Treatment: A Review

Zhao,

Liu,

et al. 2023

Molecules

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The use of magnetic composites in wastewater treatment has become widespread due to their high flocculating characteristics and ferromagnetism. This review provides an analysis and summary of the preparation and application of magnetic composites through controllable assembly for use in wastewater treatment. The applications of magnetic composites include the treatment of dye wastewater, heavy metal wastewater, microalgae suspensions, and oily wastewater. Additionally, the recycling and regeneration of magnetic composites have been investigated. In the future, further research could be focused on improving the assembly and regeneration stability of magnetic composites, such as utilizing polymers with a multibranched structure. Additionally, it would be beneficial to explore the recycling and regeneration properties of these composites.

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Synthesis of chitosan-based grafting magnetic flocculants for flocculation of kaolin suspensions

Cited by 13 publications

References 44 publications

Chitosan-Based Grafted Cationic Magnetic Material to Remove Emulsified Oil from Wastewater: Performance and Mechanism

Chitosan-Based Grafted Cationic Magnetic Material to Remove Emulsified Oil from Wastewater: Performance and Mechanism

Recent Advances in Porous Bio-Polymer Composites for the Remediation of Organic Pollutants

Preparation and Application of Magnetic Composites Using Controllable Assembly for Use in Water Treatment: A Review

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