Zr4+ and glutaraldehyde cross-linked polyethyleneimine functionalized chitosan composite: Synthesis, characterization, Cr(VI) adsorption performance, mechanism and regeneration

Xu, Chunzi; Xu, Yunlan; Zhong, Dengjie; Chang, Haixing; Mou, Jiaxin; Wang, Hui; Shen, H.

doi:10.1016/j.ijbiomac.2023.124266

Cited by 24 publications

(3 citation statements)

References 74 publications

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“…The strong and broad N 1s peak for Fe 3 O 4 @ATHP1 can be fitted with four peaks located at 398.6 eV, 399.2 eV, 400.2 eV and 401.4 eV, corresponding to the four nitrogen-containing groups, –NH 2 , –N(C) 3 , –CN and –N–CO species, respectively. 34–36 The much lower surface Fe content and much higher surface N content for Fe 3 O 4 @ATHP1 suggest that ATHP1 is successfully coated with Fe 3 O 4 .…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis of hyperbranched magnetic nanospheres for highly efficient removal of methyl orange

Song,

Chen,

Lyu

et al. 2024

New J. Chem.

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Section: Resultsmentioning

confidence: 99%

Facile synthesis of hyperbranched magnetic nanospheres for highly efficient removal of methyl orange

Song,

Chen,

Lyu

et al. 2024

New J. Chem.

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“…The initial increase in the removal efficiency was due to the desorption of Cr(VI) adsorbed on TSP-3 by NaOH, releasing the active adsorption sites. The subsequent decrease in removal efficiency could be attributed to the flocculation reaction of Cr(III) with NaOH, generating Cr(OH) 3 precipitation, which covered the active adsorption sites of the nanocomposite gel coating …”

Section: Resultsmentioning

confidence: 99%

“…The subsequent decrease in removal efficiency could be attributed to the flocculation reaction of Cr(III) with NaOH, generating Cr(OH) 3 precipitation, which covered the active adsorption sites of the nanocomposite gel coating. 41…”

Section: Removal Of Cr(vi)mentioning

confidence: 99%

Ultrathin and Metal Ions-Free Polyionic Nanogel Coating Membrane for Efficient and Fast Oil-in-Water Emulsions Separation and Cr(VI) Removal: Adsorption Properties, Kinetics, and Mechanism

Luo,

Zheng,

Long

et al. 2024

Ind. Eng. Chem. Res.

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The problem of oil fouling and the complex composition of oily wastewater are bottlenecks that urgently need to be addressed for the application of membrane separation technology in the field of oil−water separation. Therefore, ultrathin TA/SA/PEI polyionic nanogel coatings were constructed on hydrophobic PVDF membrane surfaces through surface grafting and dopamine-like self-polymerization reactions. The functional coated membranes (TSP-3) retain superhydrophilicity and underwater superoleophobicity, even in harsh environments such as strong acids, strong alkalis, various salt solutions, ultrasound, and abrasion. The TSP-3 membrane exhibited excellent separation efficiency (>99%) for a wide range of oil-in-water emulsions stabilized by surfactants, with virtually no deterioration in flux (>8014.70 ± 298.86 L•m −2 •h −1 •bar −1 ) over five dead-end cycle separations. The formation process of the oil film filter cake was also analyzed in crossflow mode. It was assumed that the accumulation of oil droplets on the membrane surface to form a film under certain conditions was beneficial to the membrane's antioil fouling performance. Meanwhile, the TSP-3 membrane possessed high removal efficiency (96.13%) and recoverability for Cr(VI), and the phenolic hydroxyl groups could also reduce Cr(VI) to the lower toxicity Cr(III). Various adsorption kinetic and isotherm models were used to analyze the adsorption process, and the results fit well with the pseudo-second-order kinetic model (R 2 = 0.99820) and the Langmuir model (R 2 = 0.99986). This indicated that the adsorption of Cr(VI) by TSP-3 was monomolecular layer chemical adsorption on heterogeneous surfaces, and the adsorption was favorable (0 < R L < 1). Electrostatic attraction and hydrogen bonding were considered to play a key role in the adsorption of Cr(VI) by XPS characterization analysis and DFT theoretical calculations. This strategy provided a feasible approach for constructing ultrathin polyanionic nanogel membranes to achieve an antioil barrier, which could effectively and rapidly separate a wide range of oil-in-water emulsions stabilized by surfactants, while removing and reducing Cr(VI).

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A novel starch‐based composite hydrogel enhanced by activated charcoal from the banana peel for water decontamination

Maia,

Pereira,

da Silva

et al. 2024

J of Applied Polymer Sci

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The efficient removal of potential toxic elements (PTEs) from aqueous systems is an important challenge in water purification and industrial effluent treatment. Starch‐based hydrogels have shown promise in this context due to their unique properties, such as high absorption capacity and water retention. This work synthesized a novel hydrogel with and without activated charcoal (AC) from banana peel (5 wt.%) and trisodium citrate as a crosslinking agent and starch to remove PTEs. These hydrogels were characterized by Fourier‐transformed infrared (FTIR), scanning electron microscopy, TGA, XRD, water absorption, and zero‐charge point techniques. Subsequently, the affinity of AC, neat hydrogel, and the composite hydrogel for removing Cr6+, Cd2+, Ni2+, Mn2+, Zn2+, and Cu2+ in aqueous solution was evaluated. FTIR confirmed a crosslinking reaction between the starch molecules and the crosslinking agent (trisodium citrate). Besides, the addition of hydrogel+5%AC altered the crosslinking process. Adding AC to the hydrogel composite increased crystallinity, thermal stability, and porous size. The highest removal efficiency of neat hydrogel and hydrogel+5%AC was for Cr6+, obtaining 83.2% and 98.5%, respectively. As for the AC, the removal of Cu2+ was satisfactory, with 80.4%. Thus, hydrogel+5%AC proves to be a highly viable adsorbent for posttreatment of wastewater due to its ability to efficiently remove PTEs.

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Zr4+ and glutaraldehyde cross-linked polyethyleneimine functionalized chitosan composite: Synthesis, characterization, Cr(VI) adsorption performance, mechanism and regeneration

Cited by 24 publications

References 74 publications

Facile synthesis of hyperbranched magnetic nanospheres for highly efficient removal of methyl orange

Facile synthesis of hyperbranched magnetic nanospheres for highly efficient removal of methyl orange

Ultrathin and Metal Ions-Free Polyionic Nanogel Coating Membrane for Efficient and Fast Oil-in-Water Emulsions Separation and Cr(VI) Removal: Adsorption Properties, Kinetics, and Mechanism

A novel starch‐based composite hydrogel enhanced by activated charcoal from the banana peel for water decontamination

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