Enhanced Gold(III) adsorption using glutaraldehyde-crosslinked chitosan beads: Effect of crosslinking degree on adsorption selectivity, capacity, and mechanism

Bui, Tung Thanh; Lee, Woorim; Jeon, Seongbeom; Kim, Kyoung-Woong; Lee, Yunho

doi:10.1016/j.seppur.2020.116989

Cited by 88 publications

(25 citation statements)

References 53 publications

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“…At the same time, the peak at 2931 cm −1 corresponds to the increase in CH stretching vibration, and the peak at 2866 cm −1 corresponds to the decrease in CH stretching vibration, consistent with the change trend in the FTIR spectra of sodium lignosulfonate/chitosan adhesives [14]. The peak at 1552 cm −1 in the FTIR spectrum of C-G corresponds to the overlapping of C-N in amide II band in chitosan and C = C resulting from the aldol reaction of glutaraldehyde [20]. This peak gradually shifted to higher wavenumbers with the increase in the mass ratio of sodium lignosulfonate to chitosan in L/C-G and finally moved to 1572 cm −1 in the FTIR spectrum of L/C-G 5, because this peak was finally overlapped with the peak of stretching vibration of aromatic ring in sodium lignosulfonate [14].…”

Section: Ftir Analysissupporting

confidence: 72%

Effect of sodium lignosulfonate on bonding strength and chemical structure of a lignosulfonate/chitosan-glutaraldehyde medium-density fiberboard adhesive

Liu

Yuan

Guo

et al. 2021

Adv Compos Hybrid Mater

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Sodium lignosulfonate/chitosan-glutaraldehyde adhesive (L/C-G) has potential in environment-friendly wood-based panel adhesive applications. However, the effect of sodium lignosulfonate on the bonding strength and chemical structure of L/C-G was not elucidated. Herein, the role of sodium lignosulfonate in L/C-G was studied in detail by characterizing the mechanical properties and water resistance of medium-density fiberboards (MDFs) prepared using L/C-G as adhesives. The functional groups, thermal stability, and crystalline structure of L/C-G with various mass ratios of sodium lignosulfonate to chitosan were also characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, and X-ray diffraction, respectively. The results show that an appropriate amount of sodium lignosulfonate in L/C-G was beneficial for its bonding strength, and the MDFs with 1:2 mass ratio of sodium lignosulfonate to chitosan showed superior mechanical properties and comparable water resistance with a commercial panel. Besides the reaction between sodium lignosulfonate and chitosan, guaiacyl units, or lateral chain of sodium lignosulfonate might also react with glutaraldehyde and result in C-O-C groups, helpful for the bonding strength of L/C-G.

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Section: Ftir Analysissupporting

confidence: 72%

Effect of sodium lignosulfonate on bonding strength and chemical structure of a lignosulfonate/chitosan-glutaraldehyde medium-density fiberboard adhesive

Liu

Yuan

Guo

et al. 2021

Adv Compos Hybrid Mater

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“…Finally, with the crosslinking agent (GA) addition, the CS amino groups reacted with generating chemical cross-links of imines ( Figure 3 c). However, several studies have indicated that the CS–GA reaction can undergo self-oligomerization by aldol condensation, producing a longer chain in the crosslinking structure [ 32 ]. In this aspect, the crosslinking reaction generated an orange color that corresponded to the presence of unsaturated bonds such as C = N (imine), C = C (double bond), and C = O (aldehyde).…”

Section: Resultsmentioning

confidence: 99%

“…In this aspect, the crosslinking reaction generated an orange color that corresponded to the presence of unsaturated bonds such as C = N (imine), C = C (double bond), and C = O (aldehyde). This increase in unsaturated bonds can lead to color intensification for some beads [ 31 , 32 , 33 , 34 ].…”

Section: Resultsmentioning

confidence: 99%

Optimization of Chitosan Glutaraldehyde-Crosslinked Beads for Reactive Blue 4 Anionic Dye Removal Using a Surface Response Methodology

Galan

Trilleras

Zapata

et al. 2021

Life

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The use of dyes at an industrial level has become problematic, since the discharge of dye effluents into water disturbs the photosynthetic activity of numerous aquatic organisms by reducing the penetration of light and oxygen, in addition to causing carcinogenic diseases and mutagenic effects in humans, as well as alterations in different ecosystems. Chitosan (CS) is suitable for removing anionic dyes since it has favorable properties, such as acquiring a positive charge and a typical macromolecular structure of polysaccharides. In this study, the optimization of CS beads crosslinked with glutaraldehyde (GA) for the adsorption of reactive blue dye 4 (RB4) in an aqueous solution was carried out. In this sense, the response surface methodology (RSM) was applied to evaluate the concentration of CS, GA, and sodium hydroxide on the swelling degree in the GA-crosslinked CS beads. In the same way, RSM was applied to optimize the adsorption process of the RB4 dye as a function of the initial pH of the solution, initial concentration of the dye, and adsorbent dose. The crosslinking reaction was investigated by scanning electron microscopy (SEM), Fourier transformed infrared spectroscopy (FTIR), and X-ray diffractometry (XRD). The design described for the swelling degree showed an R2 (coefficient of determination) adjusted of 0.8634 and optimized concentrations (CS 3.3% w/v, GA 1.7% v/v, and NaOH 1.3 M) that were conveniently applied with a concentration of CS at 3.0% w/v to decrease the viscosity and facilitate the formation of the beads. In the RB4 dye adsorption design, an adjusted R2 (0.8280) with good correlation was observed, where the optimized conditions were: pH = 2, adsorbent dose 0.6 g, and initial concentration of RB4 dye 5 mg/L. The kinetic behavior and the adsorption isotherm allowed us to conclude that the GA-crosslinked CS beads’ adsorption mechanism was controlled mainly by chemisorption interactions, demonstrating its applicability in systems that require the removal of contaminants with similar structures to the model presented.

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“…The advantage of this method is that the reaction rate can be increased, and the activation energy of the entire polymerization reaction can be reduced. 34,35 FT-IR spectra were obtained to characterize the chemical structures of the raw-MWCNTs, MWCNTs-COOH, unleached MMWCNTs@Cs(I)-IIP and leached MMWCNTs@Cs(I)-IIP. The results are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Determination of cesium ions in environmental water samples with a magnetic multi-walled carbon nanotube imprinted potentiometric sensor

Wang

Zhou

et al. 2021

RSC Adv.

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Enhanced Gold(III) adsorption using glutaraldehyde-crosslinked chitosan beads: Effect of crosslinking degree on adsorption selectivity, capacity, and mechanism

Cited by 88 publications

References 53 publications

Effect of sodium lignosulfonate on bonding strength and chemical structure of a lignosulfonate/chitosan-glutaraldehyde medium-density fiberboard adhesive

Effect of sodium lignosulfonate on bonding strength and chemical structure of a lignosulfonate/chitosan-glutaraldehyde medium-density fiberboard adhesive

Optimization of Chitosan Glutaraldehyde-Crosslinked Beads for Reactive Blue 4 Anionic Dye Removal Using a Surface Response Methodology

Determination of cesium ions in environmental water samples with a magnetic multi-walled carbon nanotube imprinted potentiometric sensor

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