Preparation of CTS/PAMAM/SA/Ca2+ hydrogel and its adsorption performance for heavy metal ions

Sun, Heyu; Zhan, Jiang; Chen, Li; Zhao, Yiping

doi:10.1016/j.apsusc.2022.155135

Cited by 39 publications

(16 citation statements)

References 70 publications

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“…Figure demonstrates that the initial weight loss temperature of PVB was 338.40 °C, indicating its relatively high thermal stability, which meets the requirements for water treatment. And from the figure, it can be seen that the weight loss curve of PVB consisted of three weight loss stages . The first stage spanned from 338.40 to 395.44 °C, during which PVB experienced a mass loss of 73.87%.…”

Section: Conclusion and Discussionmentioning

confidence: 98%

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Adsorption of Sodium Dodecyl Sulfonate from Aqueous Solution by Polyvinyl Butyral: Kinetics and Thermodynamics

Sun

Zeng

2023

Ind. Eng. Chem. Res.

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During the synthesis of polyvinyl butyral (PVB), sodium dodecyl sulfonate (SDS) is generally added in appropriate amounts, which prevents PVB from agglomeration but also causes PVB to turn yellow. The removal of SDS and its final residue in PVB are closely related to the adsorption performance of SDS on PVB. In this study, PVB with a high acetal degree (81.96 mol %) was synthesized by polyvinyl alcohol and butyraldehyde and was characterized by 1H NMR, Fourier transform infrared spectroscopy, scanning electron microscopyenergy-dispersive X-ray spectroscopy, and other methods. The adsorption properties of SDS on PVB were investigated under different initial pHs, PVB doses, PVB particle sizes, contact times, initial SDS concentrations, and temperatures. The adsorption kinetic data were analyzed using pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models. The results showed that the pseudo-second-order model fitted the adsorption data well, and the intraparticle diffusion was not the only control mechanism for PVB adsorption. The equilibrium data were analyzed with Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich models. The results showed that the adsorption data conformed to the Langmuir model, and the maximum adsorption capacity of PVB for SDS was 40.5168 mg/g at 290.15 K. Moreover, the Dubinin–Radushkevich model illustrated that the adsorption process was chemisorption at low SDS concentrations and physical adsorption otherwise. The thermodynamic parameters showed that the adsorption of SDS on PVB was spontaneous and exothermic. In conclusion, the research results provide some basis for the PVB purification plant equipment.

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Section: Conclusion and Discussionmentioning

confidence: 98%

“…And from the figure, it can be seen that the weight loss curve of PVB consisted of three weight loss stages. 21 The first stage spanned from 338.40 to 395.44 °C, during which PVB experienced a mass loss of 73.87%. The second stage occurred between 412.56 and 473.39 °C, with a mass loss of 12.00% for PVB.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Adsorption of Sodium Dodecyl Sulfonate from Aqueous Solution by Polyvinyl Butyral: Kinetics and Thermodynamics

Sun

Zeng

2023

Ind. Eng. Chem. Res.

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“…11 At present, a variety of adsorbents have been developed for the removal of heavy metal ions in wastewater, 12 including graphene-based adsorbent, 13 MOF-based adsorbent, 14 clay-based adsorbent, 15 and cellulose-based adsorbent. 16 However, the small adsorption capacity, low adsorption efficiency, 17 and high cost 18 of most adsorbents limit their application range. 19 Therefore, the development of adsorption materials with low price, simple preparation process, high efficiency, and largescale production is the key to the promotion and application of adsorption methods in the treatment of heavy metal ions wastewater.…”

Section: ■ Introductionmentioning

confidence: 99%

3D Wood Microfilter for Fast and Efficient Removal of Heavy Metal Ions from Water

He,

Zhao,

Sun

et al. 2023

Langmuir

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Adsorption is an effective method for the treatment of heavy metal ions in water; however, the existing adsorbents are complicated to prepare, and costly and difficult to recover. In this work, a 3D wood microfilter was prepared by modifying wood for the removal of heavy metal contaminants from water. First, a green deep eutectic solvent was used to remove lignin from beech wood. Then citric acid and l-cysteine were sequentially used to graft carboxyl and sulfhydryl groups (−SHs) on the surface of cellulose. Finally, a three-dimensional wood microfilter with an abundant porous structure and adsorption sites was formed. The adsorption kinetics and adsorption isotherms of heavy metal ions on the 3D wood microfilter were systematically investigated using Cu2+ and Cd2+ as model species. The results showed that the 3D wood microfilter had a fast adsorption rate and high saturation capacity for both Cu2+ and Cd2+. Based on the advantages of easy processing and multilayer assembly and stacking, a three-layer wood microfilter was designed to achieve high flux rate (1.53 × 103 L m–2 h–1) and high efficiency (>98%) for the removal of heavy metal ions in water. The enhancement mechanism of the adsorption process of Cu2+ and Cd2+ by the 3D wood microfilter was investigated using SEM and EDS, FTIR, and XPS characterization. The simple synthesis method and high adsorption efficiency of this wood microfilter provide a new strategy for the preparation of cheap, efficient, and recyclable adsorbents for heavy metal ions in water.

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“…Hyperbranched polyamidoamines (HPAMAMs) have attracted increasing attention in the construction of biocompatible hydrogels owing to their featured water solubility, nontoxicity, and versatility. − Attributed to their unique three-dimensional spatial molecular conformation, HPAMAMs are frequently utilized as large crosslinking centers in hydrogel networks to modulate the mechanical properties of hydrogels. − Herein, a vinyl-capped HPAMAM (EHP-vinyl) with electroactive viologen groups was synthesized using a one-pot Michael addition polymerization method coupled with a terminal modification approach. The obtained EHP-vinyl participates in the free radical polymerization of acrylamide as large crosslinking centers, yielding covalently crosslinked conductive hydrogels (EHP/PAM).…”

Section: Introductionmentioning

confidence: 99%

Conductive Viologen Hydrogel Based on Hyperbranched Polyamidoamine for Multiple Stimulus-Responsive Drug Delivery

Zhao

Zhou

Wang³

et al. 2023

ACS Appl. Mater. Interfaces

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The emergence of precision medicine and personalized pharmacotherapy has led to the development of advanced drug delivery systems that can respond to multiple stimuli. Conductive hydrogels have excellent electrical signal responsiveness and drug storage capabilities; however, current conductive hydrogels suffer from poor mechanical properties, low ionic conductivity, and high voltage. Herein, a covalently crosslinked viologen hydrogel was prepared using electroactive hyperbranched polyamidoamine (EHP) as the crosslinking center in a polymeric network. Attributed to its unique molecular architecture, this hydrogel exhibits improved mechanical properties (high tensile strength and desirable stretchability up to 1280%). Approvable ionic conductivity, biocompatibility, antibacterial properties, and wearable strain-sensing performance were also disclosed, ascribed to the participation of versatile viologen groups in the hydrogel structure. This hydrogel exhibited high efficiency in drug release (81.6%) at a lower voltage of −1.2 V. Moreover, fascinating pH-stimulus drug release behavior was also demonstrated in both acidic and alkalescent environments owing to the dramatic conformational transition of EHP. This work provides a new design strategy for conductive hydrogels for multiple stimulusresponsive drug delivery systems.

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Preparation of CTS/PAMAM/SA/Ca2+ hydrogel and its adsorption performance for heavy metal ions

Cited by 39 publications

References 70 publications

Adsorption of Sodium Dodecyl Sulfonate from Aqueous Solution by Polyvinyl Butyral: Kinetics and Thermodynamics

Adsorption of Sodium Dodecyl Sulfonate from Aqueous Solution by Polyvinyl Butyral: Kinetics and Thermodynamics

3D Wood Microfilter for Fast and Efficient Removal of Heavy Metal Ions from Water

Conductive Viologen Hydrogel Based on Hyperbranched Polyamidoamine for Multiple Stimulus-Responsive Drug Delivery

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