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Dye adsorption performance of nanocellulose beads with different carboxyl group content

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Abstract

The problems caused by water pollution are increasingly serious, wastewater contains a lot of heavy metal ions, textile dyes, medicines, etc. However, most adsorption materials usually face problems such as inefficient recycling, high cost, and secondary pollution. As a natural polymer, cellulose has low cost, degradability and good biocompatibility. In this work, by changing the addition amount of sodium hypochlorite during 2,2,6,6-Tetramethylpiperidine-1-oxyl radical (TEMPO) oxidation, nanocellulose with different carboxyl content could be prepared, which is expected to be a good high-efficiency cationic adsorbent due to its rich in hydroxyl groups on the surface and negatively charged. Then the calcium chloride solution was used as the cross-linking agent to prepare TEMPO-oxidized cellulose nanofibril beads (TOCNB) by the dropping solidification method. As the content of carboxyl groups increases, the Zeta potential value of the nanocellulose dispersion became increasingly negative. The nanocellulose beads all presented a good three-dimensional network porous structure. With the increase of carboxyl group content, the specific surface area increases from 173 to 367 m2 g−1, and the adsorption capacity for methylene blue (MB) also gradually strengthened. The saturated adsorption capacity of TOCNB on MB was calculated as high as 925.93 mg g−1. The nanocellulose bead was a cationic adsorbent with highly efficient adsorption and adjustable specific surface area, and the preparation method was simple, fast, efficient and green.

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The datasets used and/or analysis during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

The research was supported by the Shandong Provincial Natural Science Foundation of China (No. ZR202103020328), Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City (Grant No.520LH017), and Hainan Institute of Wuhan University of Technology (2021KF0015).

Funding

Funding was provided by the Shandong Provincial Natural Science Foundation of China (No. ZR202103020328), Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City (Grant No.520LH017), and Hainan Institute of Wuhan University of Technology (2021KF0015).

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JX: Writing—original draft, Investigation, Methodology, Formal analysis. EZ: Writing—review and editing, Validation, Investigation, Data curation, Visualization. HZ: Investigation. DL: Investigation. HC: Conceptualization, Writing—review and editing. CX: Writing—review and editing. QY: Investigation, Writing—review and editing. ZS: Conceptualization, methodology, project administration, Writing—review and editing, supervision.

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Correspondence to Haopeng Cai, Quanling Yang or Zhuqun Shi.

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Xue, J., Zhu, E., Zhu, H. et al. Dye adsorption performance of nanocellulose beads with different carboxyl group content. Cellulose 30, 1623–1636 (2023). https://doi.org/10.1007/s10570-022-04964-1

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  • DOI: https://doi.org/10.1007/s10570-022-04964-1

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