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Efficient algal lipid extraction via photocatalysis and its conversion to biofuel

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  • Shwetharani, R.
  • Balakrishna, R. Geetha

Abstract

Microalgae play an important role in energy production to solve the major energy crisis. The present study demonstrates an efficient and environmental friendly route for bio-oil extraction from wet Nannochloropsis oculata algal biomass through photocatalysis. The method uses abundant solar energy and catalytic amount of titanium dioxide photocatalyst for the rupturing of wet algal cells and reduces most of the cost by avoiding dewatering and drying, for algal oil production. The various spectroscopy and microscopy techniques used show destruction of algal cell membrane by the photocatalyst, with a release of 52.2% lipid yield. The obtained lipid by photocatalysis on esterification yields biofuel which is in complete agreement with results obtained from conventional techniques. Algal oil is converted to biofuel through acid catalyzed transesterification. Bio-oil and biofuel samples were analyzed by ATR-IR, NMR and GCMS. The physicochemical characterization of photocatalyst was carried out by UV–Visible spectroscopy, XRD, EDS, BET and electron microscopy studies. The results suggest that the nanoparticles are efficient catalysts for rupturing the rigid micro algal cell membrane in an aqueous environment, using sunlight and hence prove to be a potential economic method for large scale bio-oil extraction.

Suggested Citation

  • Shwetharani, R. & Balakrishna, R. Geetha, 2016. "Efficient algal lipid extraction via photocatalysis and its conversion to biofuel," Applied Energy, Elsevier, vol. 168(C), pages 364-374.
    • Handle: RePEc:eee:appene:v:168:y:2016:i:c:p:364-374
    DOI: 10.1016/j.apenergy.2016.01.087
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    Cited by:

    1. Fazril Ideris & Mohd Faiz Muaz Ahmad Zamri & Abd Halim Shamsuddin & Saifuddin Nomanbhay & Fitranto Kusumo & Islam Md Rizwanul Fattah & Teuku Meurah Indra Mahlia, 2022. "Progress on Conventional and Advanced Techniques of In Situ Transesterification of Microalgae Lipids for Biodiesel Production," Energies, MDPI, vol. 15(19), pages 1-32, September.
    2. Vasistha, S. & Khanra, A. & Clifford, M. & Rai, M.P., 2021. "Current advances in microalgae harvesting and lipid extraction processes for improved biodiesel production: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 137(C).
    3. Sun, Yingqiang & Xu, Chunyan & Igou, Thomas & Liu, Peilu & Hu, Zixuan & Van Ginkel, Steven W. & Chen, Yongsheng, 2018. "Effect of water content on [Bmim][HSO4] assisted in-situ transesterification of wet Nannochloropsis oceanica," Applied Energy, Elsevier, vol. 226(C), pages 461-468.
    4. Sun, Zhe & Zhou, Zhi, 2019. "Nature-inspired virus-assisted algal cell disruption for cost-effective biofuel production," Applied Energy, Elsevier, vol. 251(C), pages 1-1.
    5. Yatish, K.V. & Omkaresh, B.R. & Kattimani, Veeranna R. & Lalithamba, H.S. & Sakar, M. & Balakrishna, R. Geetha, 2023. "Solar energy-assisted reactor for the sustainable biodiesel production from Butea monosperma oil: Optimization, kinetic, thermodynamic and assessment studies," Energy, Elsevier, vol. 263(PB).

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