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Mussel-inspired polydopamine decorated pomelo peel as a durable biosorbent for adsorption of cationic dyes

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Abstract

In this work, an eco-firendly biosorbent was simply fabricated via self-polymerization of polydopamine on the porous pomelo peel. The composition and morphology of the obtained polydopamine modified pomelo peel (PP-PDA) were confirmed by Fourier transform infrared, emission scanning electron microscopy and Brunauer−Emmett−Teller surface area measurements, respectively. Next, the adsorption capacity of the PP-PDA towards various anionic and cationic dyes was investigated. Interestingly, the PP-PDA exhibited high adsorption capacity towards cationic dyes with the maximum adsorption capacities of 434.78 mg/g for methylene blue, 208.33 mg/g for neutral red and 143.88 mg/g for malachite green, respectively. Due to this adsorption feature, the PP-PDA can achieve selective adsorption of cationic dyes from mixtures. Meanwhile, the adsorption kinetics and adsorption isotherms of the PP-PDA towards cationic dyes obeyed pseudo-second-order kinetic and Langmuir isotherm model, respectively. Additionally, the results presented that the adsorption capacity of the PP-PDA increased with the increment of pH value of the aqueous solution, however, its adsorption capacity decreased with increasing of the salt concentration. Most importantly, the fabricated PP-PDA could be easily regenerated, its adsorption capacity could be maintained well even after twenty cycles. Therefore, the as-prepared PP-PDA can be employed as a promising biosorbent for dye-contaminated wastewater of treatment.

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Acknowledgments

The authors gratefully acknowledge the support from the National Natural Science Foundation of China (No: 52003171), the Fundamental Research Funds for the Central Universities (No: YJ201823), the Science and Technology Cooperation Project between Sichuan Unversity and Zigong City (No: 2019CDZG-23) and Sichuan Science and Technology Program (No: 2020YJ0316). We would like to thank the Analytical & Testing Center of Sichuan University for SEM and XPS measurements. We also thank Sha Deng, Mi Zhou and Erhui Ren for the experimental assistance.

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Correspondence to Jianwu Lan or Shaojian Lin.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Yifei Zhan and Lin Yang as co-first author have contributed equally to this work.

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Zhan, Y., Yang, L., Lan, J. et al. Mussel-inspired polydopamine decorated pomelo peel as a durable biosorbent for adsorption of cationic dyes. Cellulose 28, 453–470 (2021). https://doi.org/10.1007/s10570-020-03541-8

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  • DOI: https://doi.org/10.1007/s10570-020-03541-8

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