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

Author

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  • Tao Zhong

    (Department of Marine Science, Ocean College, Zhejiang University, Zhoushan 316021, China)

  • Meisheng Xia

    (Department of Marine Science, Ocean College, Zhejiang University, Zhoushan 316021, China)

  • Zhitong Yao

    (College of Materials Science and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China)

  • Chenhua Han

    (Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China)

Abstract

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 N 2 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/SiO 2 composite displayed a coral-like three-dimensional porous structure with specific surface area of 640.37 m 2 /g and average pore size of 1.869 nm. The adsorption properties for methylene blue (MB) were investigated as well and the CS−2/SiO 2 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/SiO 2 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.

Suggested Citation

  • Tao Zhong & Meisheng Xia & Zhitong Yao & Chenhua Han, 2022. "Chitosan/Silica Nanocomposite Preparation from Shrimp Shell and Its Adsorption Performance for Methylene Blue," Sustainability, MDPI, vol. 15(1), pages 1-19, December.
    • Handle: RePEc:gam:jsusta:v:15:y:2022:i:1:p:47-:d:1009398
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    References listed on IDEAS

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    1. Ning Yan & Xi Chen, 2015. "Sustainability: Don't waste seafood waste," Nature, Nature, vol. 524(7564), pages 155-157, August.
    2. Dao Zhou & Hongyu Wang & Shenglian Guo, 2021. "Preparation of Cellulose/Chitin Blend Materials and Influence of Their Properties on Sorption of Heavy Metals," Sustainability, MDPI, vol. 13(11), pages 1-11, June.
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