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Evaluation of the coagulation properties of magnesium hydroxide for removal combined contamination of reactive dyes and microfibers

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Abstract

Microfibers are a new type of pollutants that are widely distributed in water bodies. And the simultaneous removal of pollutants in water is popular research in the field of water treatment. In this study, magnesium hydroxide was used as coagulant to investigate the performance and mechanism of coagulation and removal of dyes (reactive orange) and microfibers (MFs). The presence of dyestuff in the composite system promoted the removal of microfibers, and the maximum removal efficiency of both could reach 95.55% and 95.35%. The coagulation mechanism was explored by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and zeta potential. The removal of reactive orange and microfibers relied on electrical neutralization, sweep flocculation, and adsorption mechanisms. Turbidity can enhance the removal efficiency of both. Boosting the rotational speed can increase the removal efficiency of microfibers. This study provides an important theoretical support for an in-depth understanding of the characteristics and mechanisms of coagulation for the removal of complex pollutants from printing and dyeing wastewater.

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

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Funding

This work is supported by the National Key Research and Development Program of China (No. 2019YFE0122400).

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Authors

Contributions

Yingying Duan: conceptualization, methodology, investigation, writing—original draft. Jianhai Zhao: conceptualization, supervision, resources, writing—review and editing. Xiuming Qiu: formal analysis, data curation. Xiaoli Deng: visualization, investigation. Xiaoyu Ren: investigation, methodology. Wenqi Ge: software, supervision. Hongying Yuan: funding acquisition, resources, conceptualization.

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Correspondence to Jianhai Zhao.

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The authors declare no competing interests.

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Responsible Editor: Tito Roberto Cadaval Jr

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Duan, Y., Zhao, J., Qiu, X. et al. Evaluation of the coagulation properties of magnesium hydroxide for removal combined contamination of reactive dyes and microfibers. Environ Sci Pollut Res 30, 107317–107330 (2023). https://doi.org/10.1007/s11356-022-24617-x

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  • DOI: https://doi.org/10.1007/s11356-022-24617-x

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