A novel photoelectrochemical system to disrupt microalgae for maximizing lipid-extraction efficiency

Yongwu Wu, Wenhao Xiang, Linyang Li, Huimin Liu, Nianbing Zhong, Haixing Chang, Bruce E. Rittmann

Research output: Contribution to journalArticlepeer-review

Abstract

Microalgae biodiesel is a candidate to provide renewable, C-neutral energy. However, microalgal cells possess strong cell walls and cell membranes with high selective permeability, both of which hinder the extraction of lipids from the microalgae. Optimizing lipid extraction involves disrupting the microalgae's cell wall and membrane. The hydroxyl free radical (OH) can attack the cell wall and cell membrane in the microalgae, making the microalgae more susceptible to lipid extraction. Introduced here is a PhotoElectroChemical (PEC) with TiO2-based photoanode utilized UV–Vis light to produce OH at a phosphate-palladium cathode. Until now, PEC has not been utilized to disrupt microalgal cells to improve the extraction of microalgae lipids. Here, a novel PEC system – comprised of two nitrogen-doped TiO2 nanotube photoanodes, a bipolar membrane, and a phosphorus-palladium cathode – was demonstrated to disrupt microalgal biomass to improve lipid extraction. PEC utilizes ultraviolet and visible light as the only input energy for the effective disruption of the microalgal cell. Pretreatment of Chlorella using the PEC system resulted in 96% oil-extraction efficiency which was approximately 10 times higher than that achieved without the pretreatment and an increases in desirable C16:0. Also explored were the mechanisms underlying OH generation and microalgae disruption. PEC promises to be an eco-friendly and low-energy technology that can promote the development of microalgae industries.

Original languageEnglish (US)
Article number130517
JournalChemical Engineering Journal
Volume420
DOIs
StatePublished - Sep 15 2021

Keywords

  • Cell-wall disruption of microalgae
  • Hydroxyl radical
  • N-doped TiO nanotube arrays
  • Oil extraction
  • Phosphorus-palladium cathode
  • Photoelectrochemical

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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