Study on the Performance of Composite Adsorption of Cu2+ by Chitosan/β-Cyclodextrin Cross-Linked Zeolite

Xiong, Qiuqiu; Zhang, Fenge

doi:10.3390/su14042106

Cited by 14 publications

(3 citation statements)

References 52 publications

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“…Furthermore, 932.7 and 952.8 eV are for Cu 2p 3/2 [45]. The peaks at 531.8 and 532.6 eV for C-OH and C=O [48] have shifted in the spectra of O 1s to 531.9 and 532.3 eV, respectively (figure 8(c)). The change in the binding energies might show the coordination of heavy metals by oxygencontaining groups which was also presented by FTIR analysis.…”

Section: A-nano Zno Beads For Metal Removal From a River Water Samplementioning

confidence: 93%

Zinc oxide nanoparticles encapsulated in alginate beads: a promising and recyclable adsorbent for simultaneous uptake of toxic metals

Çevik,

Kivilcimdan Moral

2024

Nanotechnology

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Heavy metal toxicity is a known problem and various methods are used for treatment. Adsorption has some advantages and it would be promising if environmentally friendly and cheap materials were utilized. Alginate and zinc oxide nanoparticles were selected and composite alginate beads were used for the removal of mixed metals from aqueous solutions. Batch and column experiments were conducted to determine some parameters' effects and the adsorbent's real application potential. According to the batch experiments, zinc oxide nanoparticles to alginate ratio of 0.5 g/g, and pH levels nearby to the neutral range led to better metal removals. 0.5 ml/min of flow rate supplied better metal removal efficiencies in columns, with the highest treatment as 86% of Pb2+. Acid treatment can be successfully applied for the regeneration of the adsorbent, at least three times only with a 4% reduction in the adsorption efficiency. Heavy metal uptake was compatible with the Pseudo 2nd order model indicating chemisorption as a dominant mechanism. Also, the intraparticle diffusion model illustrated adsorption might govern more than one step. The Langmuir model had the best fit and suggested monolayer covering for Pb2+, 76.3 mg/g. Alginate-based nanocomposite beads were useful for mixed metal removal and could be used.

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Section: A-nano Zno Beads For Metal Removal From a River Water Samplementioning

confidence: 93%

Zinc oxide nanoparticles encapsulated in alginate beads: a promising and recyclable adsorbent for simultaneous uptake of toxic metals

Çevik,

Kivilcimdan Moral

2024

Nanotechnology

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“…However, there are many disadvantages when using chitosan directly as an adsorbent, such as poor chemical resistance, low mechanical strength, low specific surface area, low solubility in acidic mediums, difficulty in separation, and lack of selectivity, which greatly affect the removal efficiency of pollutants [13]. In order to obtain chitosan-based materials with superior adsorption performance, most of the literature adopts the crosslinking method or compound formation to improve chemical stability and mechanical strength [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Chitosan/Silica Nanocomposite Preparation from Shrimp Shell and Its Adsorption Performance for Methylene Blue

et al. 2022

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In this study, novel chitosan/silica composites with different mass ratios were prepared by in-situ hydrolysis using chitosan (from shrimp shell) as a carrier, triblock copolymer (P123) as the structure-directing agent, and ethyl orthosilicate as a silicon source. These nanocomposites were characterized by different techniques, including the FT-IR, XRD, TGA, SEM, TEM and N2 adsorption–desorption. The results indicated that the morphology and properties of composites changed with the introduction of silica. When the CS/TEOS mass ratio was 0.0775, the CS−2/SiO2 composite displayed a coral-like three-dimensional porous structure with specific surface area of 640.37 m2/g and average pore size of 1.869 nm. The adsorption properties for methylene blue (MB) were investigated as well and the CS−2/SiO2 showed better adsorption performance. The removal rate for MB reached 94.01% with absorbents dosage of 6 g/L, initial concentration of 40 mg/L, initial pH value of 7, temperature of 35 °C, and adsorption time of 40 min. The adsorption process well fitted the Langmuir isothermal model and quasi-second-order adsorption kinetics model. The maximum adsorption capacity for MB was 13.966 mg/g based on Langmuir fitting. The surface functional groups of the composites can play an important role in the adsorption. The adsorption mechanism of CS−2/SiO2 on MB involved electrostatic interaction, hydrogen bonding and functional group complexation. In addition, the prepared chitosan/silica composites showed good reusability at six cycles, making them a promising material in the application of removing dyeing wastewater.

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“…This material was also used to adsorb high initial con-centrations of hexavalent chromium in water, and the maximum adsorption amount under the optimal conditions was found to be 555.56 mg g -1 [46]. Xiong et al [47] prepared a highly efficient Cu 2+ adsorbent, a CTS/β-CD crosslinked zeolite, by the microdrop condensation method, and the maximum adsorption capacity was 24.32 mg g -1 at 30 °C.…”

Section: Introductionmentioning

confidence: 99%

Chloride Anion Adsorption from Wastewater Using a Chitosan/β‐Cyclodextrin‐Based Composite

Zhao

Tang

Liu³

et al. 2022

Chem Eng & Technol

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In order to remove Clions from wastewater, an adsorbent composite with high efficiency for Cladsorption was prepared by the crosslinking method, where chitosan (CTS) was used as the matrix to crosslink the β-cyclodextrin polymer (β-CDP). The preparation conditions of the composite membrane were optimized based on the chloride adsorption effect. The chloride adsorption performances of the CTS/β-CDP complex and the CTS/β-CDP composite membrane were significantly higher than that of the CTS-only membrane, and the composite membrane showed slightly better performance than the complex. The structure and properties of the chitosan/β-cyclodextrin-based composite membrane were characterized by scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The prepared composite material can be used for the adsorptive removal of Clin water, with further research and development prospects.

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Study on the Performance of Composite Adsorption of Cu2+ by Chitosan/β-Cyclodextrin Cross-Linked Zeolite

Cited by 14 publications

References 52 publications

Zinc oxide nanoparticles encapsulated in alginate beads: a promising and recyclable adsorbent for simultaneous uptake of toxic metals

Zinc oxide nanoparticles encapsulated in alginate beads: a promising and recyclable adsorbent for simultaneous uptake of toxic metals

Chitosan/Silica Nanocomposite Preparation from Shrimp Shell and Its Adsorption Performance for Methylene Blue

Chloride Anion Adsorption from Wastewater Using a Chitosan/β‐Cyclodextrin‐Based Composite

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