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Utilizing a sustainable surfactant from Cucurbita pepo seeds for eco-friendly flotation of non-coking coal in sustainable energy applications

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Abstract

Fatty acids are being explored as a promising collector in coal flotation as they consist of both polar head and non-polar aliphatic tails. In the present study, the fatty acid–rich oil extracted from Cucurbita pepo (Cp) seeds by Soxhlet extraction was used as a bio-based surfactant to reduce ash in non-coking coal by flotation. The FTIR and GCMS were used to investigate the functional groups and free fatty acid composition of the extracted oil respectively. The molecular conformation was identified using NMR spectroscopy. The extracted Cp oil was primarily composed of linoleic acid (64.17%) and oleic acid (11.54%). The extracted oil was utilized as a bio-based surfactant to float high ash non-coking coal, taking advantage of the oil’s fatty acid content. Taguchi’s design of experiments was used to optimize flotation process parameters such as collector dosage (extracted Cp oil), frother dosage (MIBC), and airflow rate. ANOVA analysis was conducted to determine the significance of the process parameters. It was observed that frother dosage played the most significant role in achieving optimal ash rejection, followed by collector dosage and airflow rate. The optimized conditions for combustible recovery were at airflow rate of 2.0 lpm, collector dosage of 3.5 ml, and frother dosage of 0.35 ml. For optimal combustible recovery (92.15) and separation efficiency (67.77), airflow rate had the highest impact, followed by collector and frother dosages. From the XRD analysis, it was found that the major gangue, namely, quartz and kaolinite present in the non-coking coal, were significantly reduced in the final concentrate (float). Thus, the oil extracted from the seeds of Cucurbita pepo can be used as a bio-based surfactant in high ash, non-coking coal flotation.

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Acknowledgements

One of the authors, Ms. I. Cassandra Austen, wishes to express her profound gratitude to Dr. Mariazeena Johnson, the Chancellor of Sathyabama Institute of Science and Technology (deemed to be University), Chennai, for generously providing a Research Fellowship during the course of this research.

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Authors and Affiliations

  1. Department of Chemistry, Sathyabama Institute of Science and Technology (Deemed to Be University), Chennai, 600 119, India

    Cassandra Austen I & K. Chennakesavulu

  2. Centre for Nanoscience and Nanotechnology, International Research Centre, Sathyabama Institute of Science and Technology (Deemed to Be University), Chennai, 600 119, India

    K. Chennakesavulu & G. Ramanjaneya Reddy

  3. CSIR - National Metallurgical Laboratory Madras Centre, CSIR Madras Complex, Taramani, Chennai, 600 113, India

    N. Vasumathi, Ajita Kumari, Mousumi Gharai & T. V. Vijaya Kumar

  4. Department of Mineral Processing, Vijayanagara Sri Krishnadevaraya University, Post-Graduate Centre, Nandihalli - Sandur, Ballari, 583119, India

    N. Vasumathi

  5. Department of Chemical Engineering, Dr. B. R. Ambedkar National Institute of Technology, Jalandhar, 144011, India

    T. Anurag Kumar

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  1. Cassandra Austen I
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Conceptualization: T. V. Vijayakumar and N. Vasumathi; methodology: I. Cassandra Austen, Ajita Kumari, and G. Mousumi; software: Ajita Kumari; validation: Ajita Kumari and Mousumi; writing (original draft preparation): I. Cassandra Austen, N. Vasumathi and T. V. Vijayakumar and K. Chennakesavulu; writing (review and editing): T. Anurag Kumar and G. Ramanjaneya Reddy; supervision: N. Vasumathi and K. Chennakesavulu; all authors have read and agreed to the published version of the manuscript.

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I, C.A., Chennakesavulu, K., Reddy, G.R. et al. Utilizing a sustainable surfactant from Cucurbita pepo seeds for eco-friendly flotation of non-coking coal in sustainable energy applications. Biomass Conv. Bioref. (2024). https://doi.org/10.1007/s13399-024-05359-x

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