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Novel PVA/chitosan composite membrane modified using bio-fabricated α-MnO2 nanoparticles for photocatalytic degradation of cationic dyes

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Abstract

By integrating the benefits of poly vinyl alcohol (PVA) and chitosan (CS) with α-MnO2 nanoparticles (MNPs), a novel type of nano-polymer composite (PVA/CS-MNP) membrane was synthesized through a simple and facile casting method. In this proposed work, the membrane prepared was used for removal of organic textile dyes from their aqueous solutions. The as-synthesized PVA/CS-MNP membrane was examined using different analytical techniques such as Fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM), and mechanical properties of material was also studied. Two cationic dyes, methylene blue (MB) and eosin yellow (EY), were chosen as template dyes to be removed from industrial waste water. These dyes were degraded by carrying out a reaction in which the synthesized membrane was used as a photocatalyst. The study of kinetics revealed that the reaction process followed pseudo-first-order kinetics. The efficiency of catalyst and the rate of reaction were also examined by varying parameters such as pH, initial concentration of dyes, and composition of membrane. The maximum efficiency of catalyst was observed at pH 12 as more than 95% of dyes degraded within 1 h of time span. The catalyst was found to be reusable as its efficiency did not deteriorate even after using it for several times. Such functional membrane having higher stability, low production cost, excellent efficiency to degrade dyes, and good recyclability are promising material for distinctly effective deletion of organic dyes from waste water.

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Notes

  1. PVA: poly vinyl alcohol.

  2. CS: chitosan.

  3. MnO2 nanoparticles: MNPs.

  4. EY: eosin yellow.

  5. MB: methylene blue.

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Acknowledgements

The authors acknowledge MNIT, Jaipur, for FTIR and FESEM and CSIR-CDRI for ESI-MS characterization of samples used in this study. The authors declare no competing financial interests. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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  1. Department of Sciences and Humanities, Rajiv Gandhi Institute of Petroleum Technology, Amethi, Uttar Pradesh, 229304, India

    Vartika Srivastava & Abhay Kumar Choubey

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VS performed the experiments, analyzed, and interpreted the data. AKC guided throughout, read, and approved the final manuscript.

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Srivastava, V., Choubey, A.K. Novel PVA/chitosan composite membrane modified using bio-fabricated α-MnO2 nanoparticles for photocatalytic degradation of cationic dyes. Environ Sci Pollut Res 30, 35838–35852 (2023). https://doi.org/10.1007/s11356-022-24634-w

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