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Biocompatible self-healing hydrogels based on boronic acid-functionalized polymer and laponite nanocomposite for water pollutant removal

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Abstract

Global water pollution by organic dyes and metals may be solved by adsorption. In particular, hydrogel adsorbents display unique advantages due to their three-dimensional porous structure. Here, a new type of self-healing hydrogels based on boronate and amide bonds were prepared. The precursor polymer, 2-aminophenylboronic acid-modified polyacrylic acid (PAA-2APBA), was firstly synthesized by amidation, then, the poly(vinyl alcohol) and laponite were mixed with PAA-2APBA to form a nanocomposite hydrogel. Results show that this hydrogel has good self-healing and injectable properties, as well as good biocompatibility. The introduction of laponite nanoparticles into the hydrogel improved the stability, mechanical strength, and the adsorption efficiency of metal ions and organic dyes. The maximum adsorption of copper ion, cadmium ion, lead ion, and iron ion was 259.1 mg/g, 243.4 mg/g, 217.4 mg/g, and 166.2 mg/g, respectively. For organic dyes, 71% of methylene blue and 81% of malachite green were removed in 28 h.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Number 21805229), the Fundamental Research Funds for the Central Universities (Grant Numbers 3102017OQD039, 3102019smxy003 and 3102019ghxm017), Shaanxi Funding Scheme to Outstanding Scientific and Technological Programs by Returned Overseas Chinese Scholars (Grant Number 2018029), Innovation Capability Support Program of Shaanxi (Grant Number 2020TD-042), the Natural Science Basic Research Plan in Shaanxi Province of China (Grant Number 2019JM-581).

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XD and DY designed the research. XW, TZ, XZ, WS and JL collected the data. XW, XD, HZ, YY and CZ analyzed the data. XW and XD wrote the article. XW and XD contributed equally to this work, and they should be considered as co-first authors.

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Correspondence to Xudong Deng or Da-Chuan Yin.

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The authors declare no competing financial interest.

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Wang, XT., Deng, X., Zhang, TD. et al. Biocompatible self-healing hydrogels based on boronic acid-functionalized polymer and laponite nanocomposite for water pollutant removal. Environ Chem Lett 20, 81–90 (2022). https://doi.org/10.1007/s10311-021-01350-4

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  • DOI: https://doi.org/10.1007/s10311-021-01350-4

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