Non-porous covalent organic polymers enable ultrafast removal of cationic dyes via carbonyl/hydroxyl-synergetic electrostatic adsorption

Cao, Dong-xiao; Chen, Yan; Jin, Wei-Liang; Li, Wei; Wang, Rui; Wang, Ke; Tang, An‐Na; Zhu, Lina; Kong, De‐Ming

doi:10.1016/j.seppur.2023.123689

Cited by 13 publications

(3 citation statements)

References 34 publications

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“…All of this indicates that the C-O and C=O groups of the hydrochars are involved in the removal of MB. The presence of a large number of oxygencontaining functional groups provides the modified hydrochars with high electronegativity, thus facilitating efficient adsorption of cationic MB [55]. Moreover, the presence of a π-π conjugate structure in C=O and the aromatic rings also shows some affinity to MB [37].…”

Section: Ftir and Xps Analysismentioning

confidence: 99%

Simple Alkali-Modified Persimmon Peel–Montmorillonite Composite Hydrochar for Rapid and Efficient Removal of Methylene Blue

Chai

Gao

et al. 2023

Sustainability

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Modified persimmon peel–montmorillonite composites (PMHC-KOH/NaHCO3) for efficient and rapid removal of methylene blue (MB) were synthesized using hydrothermal carbonization and simple alkali impregnation. The surface properties and material compositions of the hydrochars were determined with SEM, zeta potential, and XRD, and the adsorption mechanism of MB on two modified hydrochars was analyzed with FTIR, XPS, and DFT calculation. The results showed that modified hydrochars with a rough surface structure and rich oxygen-containing groups exhibited a strong affinity for MB, and the adsorption capacity of PMHC-NaHCO3 and PMHC-KOH for MB reached 121.28 mg/g and 278.41 mg/g, respectively, with PMHC-KOH achieving more rapid adsorption of MB, at a rate of 0.043 g/mg/min. After five adsorption/desorption cycles, the two modified hydrochars still maintained a high adsorption rate of MB (92.32%/98.43%). The excellent adsorption performance of the modified hydrochars was attributed to hydrogen bonding, π-π interaction, electrostatic attraction, and ion exchange. DFT calculations revealed that oxygen-containing groups of the modified hydrochars played an important role in the adsorption of MB and confirmed that electrostatic attraction, hydrogen bonding, and π-π interactions were the key forces for rapid and efficient adsorption of MB. The prepared adsorbents gave full play to the regenerative applicability of agricultural waste, the simple alkali impregnation method eliminated the need for the additional cost of pyrolysis and activation, and their application in MB adsorption realized the treatment of waste with waste.

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Section: Ftir and Xps Analysismentioning

confidence: 99%

Simple Alkali-Modified Persimmon Peel–Montmorillonite Composite Hydrochar for Rapid and Efficient Removal of Methylene Blue

Chai

Gao

et al. 2023

Sustainability

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“…In recent years, COPs have drawn major attention in the scientific community due to their robust structure, high chemical and thermal stability, and simple synthetic strategies. [28] Recently, Cao et al [29] designed a β-hydroxyketonelinked COP (COP OH + CO ) containing abundant hydroxyl and carbonyl groups for the removal of cationic dyes. Dong et al [30] reported two dual-functionalized covalent organic polymers (COPs), JLUE-COP1 and JLUE-COP-2 with -CO-NH-and -SO 3 H groups for enhanced methylene blue (MB) dye adsorption.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrasonic‐Assisted Nitrate Anion Incorporation in Triaminoguanidium Chloride Based Covalent Organic Polymer for Methylene Blue Dye Adsorption

Deori,

Paul,

Lahkar

et al. 2024

Chemistry An Asian Journal

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Abstract. Terephthalaldehyde‐triaminoguanidium chloride covalent organic polymer, Te‐TGCl COP can facilely be incorporated with NaNO3 by sonication. Te‐TGCl COP incorporated with NaNO3 via ultrasonication adsorbs Methylene Blue (MB) dye. Te‐TGCl COP alone shows negligible adsorption capacity for MB, however, when treated with NaNO3, its adsorption capacity emerges slightly. However, Te‐TGCl‐NaNO3 COP composite resulting from ultrasonication of the NaNO3 treated COP, showed dramatic increase in its adsorption capacity for MB (qe for Te‐TGCl COP ≈ 0 mg·g‐1; for Te‐TGCl‐NaNO3= 17.65 mg·g‐1). Emergence of MB dye adsorption property in Te‐TGCl‐NaNO3 COP composite may be attributed primarily to the electrostatic interaction of MB dye molecules with nitrate anions and the sonochemical effect caused fibrous morphological structure of the adsorbent material. The kinetics of MB dye absorption onto Te‐TGCl‐NaNO3 COP composite exhibits an excellent fit for the pseudo‐second order model, suggesting the rate‐determining step to be chemisorption. Homogenous monolayer adsorption of MB dye onto Te‐TGCl‐NaNO3 COP composite can be suggested as the Langmuir isotherm model seemed to be fitted well.

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Liquor recycling of oxidative-organosolv pretreatment of maize cob and lignin recovery

da Costa Filho,

Matias,

da Silva Pedro

et al. 2023

Biomass Conv. Bioref.

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Non-porous covalent organic polymers enable ultrafast removal of cationic dyes via carbonyl/hydroxyl-synergetic electrostatic adsorption

Cited by 13 publications

References 34 publications

Simple Alkali-Modified Persimmon Peel–Montmorillonite Composite Hydrochar for Rapid and Efficient Removal of Methylene Blue

Simple Alkali-Modified Persimmon Peel–Montmorillonite Composite Hydrochar for Rapid and Efficient Removal of Methylene Blue

Ultrasonic‐Assisted Nitrate Anion Incorporation in Triaminoguanidium Chloride Based Covalent Organic Polymer for Methylene Blue Dye Adsorption

Liquor recycling of oxidative-organosolv pretreatment of maize cob and lignin recovery

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