Microfluidic preparation of magnetic chitosan microsphere and its adsorption towards Congo red

Zhang, Yipeng; Wang, Daoquan; Bai, Xiaoyong; Xu, Jianrong; Zhang, Jianping; Zhang, Guoqiang; Huang, Cheng‐Liang; Li, Wen; Huang, Chenxi; Xiong, Xiaopeng

doi:10.1007/s10965-022-03387-7

Cited by 14 publications

(4 citation statements)

References 47 publications

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“…The peaks at 2934 cm −1 are assigned to the asymmetric vibrations of C-H bonds. The absorption peaks at 1658 cm −1 and 1593 cm −1 are attributed to the characteristic bands of amide I and amide II of CS, respectively [ 24 , 25 , 26 ]. After preparing CS and LS into granular composites (CS-LS), the stretching peak of amide I band of CS shifted from 1658 cm −1 to 1604 cm −1 , indicating the presence of hydrogen bonds between CS and LS.…”

Section: Resultsmentioning

confidence: 99%

Preparation of CS-LS/AgNPs Composites and Photocatalytic Degradation of Dyes

Wu,

Chen,

et al. 2024

Materials

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Synthetic dyes are prone to water pollution during use, jeopardizing biodiversity and human health. This study aimed to investigate the adsorption and photocatalytic assist potential of sodium lignosulfonate (LS) in in situ reduced silver nanoparticles (AgNPs) and chitosan (CS)-loaded silver nanoparticles (CS-LS/AgNPs) as adsorbents for Rhodamine B (RhB). The AgNPs were synthesized by doping LS on the surface of chitosan for modification. Fourier transform infrared (FT-IR) spectrometry, energy-dispersive spectroscopy (EDS), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were used to confirm the synthesis of nanomaterials. The adsorption and photocatalytic removal experiments of RhB were carried out under optimal conditions (initial dye concentration of 20 mg/L, adsorbent dosage of 0.02 g, time of 60 min, and UV power of 250 W), and the kinetics of dye degradation was also investigated, which showed that the removal rate of RhB by AgNPs photocatalysis can reach 55%. The results indicated that LS was highly effective as a reducing agent for the large-scale production of metal nanoparticles and can be used for dye decolorization. This work provides a new catalyst for the effective removal of dye from wastewater, and can achieve high-value applications of chitosan and lignin.

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Section: Resultsmentioning

confidence: 99%

Preparation of CS-LS/AgNPs Composites and Photocatalytic Degradation of Dyes

Wu,

Chen,

et al. 2024

Materials

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“…The addition of metal ions caused structural changes of chitosan, which are indicated by the band shifts to lower wavenumbers (except for the vibrations of the C–H bond). Dry microgels prepared from both chitosans ( DD 83 and DD 97) showed significant changes for the same bond vibrations: an absorption band in the region of 3360–3292 cm −1 attributed to –NH 2 and –OH stretching vibrations [ 20 ]; a band at 2904 cm −1 for chitosan DD 83 and one at 2917 cm −1 for chitosan DD 97 attributed to stretching of C–H bond in –CH 2 group [ 12 ]; a band at ~1650 cm −1 assigned to C=O of the amide group; bands at ~1420 and ~1320 cm −1 attributed to bond vibrations of amide III [ 21 ]; and a region of 1059–1028 cm −1 attributed to stretching vibrations of the C–O bond of the glucosamine unit [ 14 ].…”

Section: Resultsmentioning

confidence: 99%

Preparation and Properties of Bimetallic Chitosan Spherical Microgels

et al. 2023

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The aim of this work was to prepare bimetallic chitosan microgels with high sphericity and investigate the influences of metal-ion type and content on the size, morphology, swelling, degradation and biological properties of microgels. Amino and hydroxyl groups of chitosan (deacetylation degree, DD, of 83.2% and 96.9%) served as ligands in the Cu2+–Zn2+/chitosan complexes with various contents of cupric and zinc ions. The electrohydrodynamic atomization process was used to produce highly spherical microgels with a narrow size distribution and with surface morphology changing from wrinkled to smooth by increasing Cu2+ ions’ quantity in bimetallic systems for both used chitosans. The size of the bimetallic chitosan particles was estimated to be between 60 and 110 µm for both used chitosans, and FTIR spectroscopy indicated the formation of complexes through physical interactions between the chitosans’ functional groups and metal ions. The swelling capacity of bimetallic chitosan particles decreases as the DD and copper (II) ion content increase as a result of stronger complexation with respect to zinc (II) ions. Bimetallic chitosan microgels showed good stability during four weeks of enzymatic degradation, and bimetallic systems with smaller amounts of Cu2+ ions showed good cytocompatibility for both used chitosans.

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“…Finally, they proposed a correlation for the shell thickness using the shell-to-core phase velocity ratio and performed 51 CFD simulations. Using a co-flow microfluidic device, Zhang and colleagues [25]prepared a magnetic chitosan microsphere without using any surfactant or cross-linking agent. This method creates magnetic chitosan microspheres of evensized.…”

Section: Introductionmentioning

confidence: 99%

Effects of the microchannel shape upon droplet formations during synthesis of nanoparticles

Raji

Kazemeini

2023

Scientia Iranica

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Advances in nanotechnology have made it possible to produce minimal tools and equipment that can be used to control tiny volumes of fluids. Currently, at the center of attention of scientists in various fields, such systems are referred to as microfluidic systems. Also, the ability to synthesize nanoparticles with precise control over the particle's form and size is crucial. The primary goal of this research was to see if the nozzle-focused microchannels could have been used to synthesize the Polycaprolactone (PCL) polymer nanoparticles through the COMSOL Multiphysics 5.4 software medium. In this study, the velocity and static pressure of the droplet after leaving the nozzle and entering the main channel, as well as the size, shape, distribution, and weight of the droplet in terms of the time step, were understudied. It was revealed that the channel's design allowed the droplets to keep their steady structure at its conclusion. Finally, it was shown that the droplet possessed a dual functionality of place and time in terms of size and weight distribution after a time step of 0.00305 seconds. The maximum drop saturation mass was formed, and the droplet diameter size displayed a plateau after 0.01 seconds.

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Microfluidic preparation of magnetic chitosan microsphere and its adsorption towards Congo red

Cited by 14 publications

References 47 publications

Preparation of CS-LS/AgNPs Composites and Photocatalytic Degradation of Dyes

Preparation of CS-LS/AgNPs Composites and Photocatalytic Degradation of Dyes

Preparation and Properties of Bimetallic Chitosan Spherical Microgels

Effects of the microchannel shape upon droplet formations during synthesis of nanoparticles

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