Preparation, characterization, adsorption kinetics and thermodynamics of chitosan adsorbent grafted with a hyperbranched polymer designed for Cr(VI) removal

Li, Qiaoping; Xu, Bin; Zhuang, Linghua; Xu, Xiaoqing; Wang, Guowei; Zhang, Xinghua; Chen, Jing; Tang, Yang

doi:10.1007/s10570-018-1791-6

Cited by 22 publications

(15 citation statements)

References 52 publications

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“…Regarding this, the introduction of HBP-NH 2 groups might make the polymer easier to decompose. The results are consistent with those in previous studies, where the decomposition temperature of cellulose usually decreased by grafting with hyperbranched polymers [37].…”

Section: Resultssupporting

confidence: 93%

“…It can be seen that with the increased pH, both the adsorption capacity and the removal rate decreased. As previously reported about a chitosan-based bio-adsorbent, a higher Cr(VI) adsorption capacity usually occurs at a pH value lower than 4 [37]. The greater adsorption capacity for Cr(VI) at a low pH value might be explained by the surface protonation of HBP- g -BC.…”

Section: Evaluation Of Adsorption Capacity Of Hbp-g-bcmentioning

confidence: 72%

“…In the spectrum of HBP-g-BC, this peak of aldehyde group disappears, the peak of C–H vibration at 2921 moves to 2893 cm −1 , and there is a new characteristic peak at 1544 cm −1 , which could be assigned to the vibration of amine groups. This indicates that through the reaction between the aldehyde groups of DABC and the amino groups of HBP-NH 2 , HBP-NH 2 was successfully grafted onto BC to form HBP- g -BC [37].…”

Section: Resultsmentioning

confidence: 99%

“…In our preliminary experiments, the change in adsorption capacity is small when the pH value is higher than 6. To investigate the effect of pH, the adsorption tests were carried out at pH values from 2 to 6 [37]. The relationship between the adsorption capacity for Cr(II) and the pH is shown in Figure 4.…”

Section: Evaluation Of Adsorption Capacity Of Hbp-g-bcmentioning

confidence: 99%

“…Lin et al [36] investigated the performance of a hyperbranched polyamide-modified corncob adsorbent for Cr(VI), and the adsorption capacity was shown to be up to 47.8 mg/g. More recently, Li et al [37] modified chitosan with an amino-terminated hyperbranched polymer, which was applied to remove Cr(VI). The removal rate was shown to be up to 93.8%.…”

Section: Introductionmentioning

confidence: 99%

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Bagasse Cellulose Grafted with an Amino-Terminated Hyperbranched Polymer for the Removal of Cr(VI) from Aqueous Solution

et al. 2018

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A novel bio-adsorbent was fabricated via grafting an amino-terminated hyperbranched polymer (HBP-NH2) onto bagasse cellulose. The morphology and microstructure of the HBP-NH2-grafted bagasse cellulose (HBP-g-BC) were characterized and its adsorption capacity for Cr(VI) ions in aqueous solutions was investigated. The rough surface structure of HBP-g-BC that is beneficial for improving the adsorption capacity was observed by scanning electron microscopy (SEM). The grafting reaction was confirmed by Fourier-transform infrared (FT-IR) spectroscopy. The adsorbent performance was shown to be better with a lower pH value, a higher adsorbent dosage, or a higher initial Cr(VI) concentration. Moreover, the kinetics study revealed that the adsorption behavior followed a pseudo-second-order model. The isotherm results showed that the adsorption data could be well-fitted by the Langmuir, Freundlich, or Temkin models. Moreover, HBP-g-BC could maintain 74.4% of the initial removal rate even after five cycles of regeneration. Thus, the high potential of HBP-g-BC as a bio-adsorbent for heavy metal removal has been demonstrated.

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Section: Resultssupporting

confidence: 93%

Section: Evaluation Of Adsorption Capacity Of Hbp-g-bcmentioning

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Evaluation Of Adsorption Capacity Of Hbp-g-bcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bagasse Cellulose Grafted with an Amino-Terminated Hyperbranched Polymer for the Removal of Cr(VI) from Aqueous Solution

et al. 2018

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Functionalized chitosan with butylammonium ionic liquids for removal of Cr(VI) from aqueous solution

Eliodório

Pereira

Morandim-Giannetti

2020

J of Applied Polymer Sci

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Environmental pollution by heavy metals is currently a problem of great concern for human health. In this context, this study aims to contribute with the synthesis and characterization of chitosan functionalized with three different ionic liquids (n-butylammonium acetate, sec-butylammonium acetate, and tert-butylammonium acetate) followed by its application in hexavalent chromium effluent treatment. The adsorbents synthesized (ChN, ChS, and ChT) were characterized by SEM, EDS, FTIR, BET, RDD, PSD, and XRD techniques. Afterward, the influences of temperature, contact time, and pH on the Cr(VI) adsorption process were evaluated. The solution with pH 3 displayed the highest adsorption capacities (107.31, 104.60, and 107.97 mg.g-1 for ChN, ChS, and ChT, respectively). The kinetic data were better adjusted to the Weber-Morris kinetic model with an ideal time of 2 h. Furthermore, the influence of temperature was evaluated using the Freundlich and Langmuir isotherms, with maximum capacities of 142.05 (ChN), 131.58 (ChS), and 146.63 mg.g-1 (ChT). The adsorbent displayed enhanced adsorption properties in comparison with raw chitosan by an intensification of the electrostatic interaction between amino groups and hexavalent chromium. Finally, the reusability was investigated, and significant results were observed (84.33 ± 4.87%) in the adsorption process after 4 cycles.

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Study of chromate (VI) removal via sequential combined fenton’s process and adsorption by nano-magnesium oxide-modified wood biochar for tannery wastewater treatment

Singh,

Prasad,

Dave

et al. 2024

Clean Techn Environ Policy

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Preparation, characterization, adsorption kinetics and thermodynamics of chitosan adsorbent grafted with a hyperbranched polymer designed for Cr(VI) removal

Cited by 22 publications

References 52 publications

Bagasse Cellulose Grafted with an Amino-Terminated Hyperbranched Polymer for the Removal of Cr(VI) from Aqueous Solution

Bagasse Cellulose Grafted with an Amino-Terminated Hyperbranched Polymer for the Removal of Cr(VI) from Aqueous Solution

Functionalized chitosan with butylammonium ionic liquids for removal of Cr(VI) from aqueous solution

Study of chromate (VI) removal via sequential combined fenton’s process and adsorption by nano-magnesium oxide-modified wood biochar for tannery wastewater treatment

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