Kinetic study and pyrolysis: GC/MS products analysis of Spirulina platensis cultivated under a different growing medium

Chagas, Bruna Maria Emerenciano das; Costa, Cíntia C.; Chagas, Mariane B.; Paula, Sueilha A. F.; Braga, Renata Martins; Melo, M. A. F.; Aguiar, Emerson Moreira de; Oliveira, Jackson Araújo de; Souza, Jairo Rodrigues; Ataíde, Carlos Henrique

doi:10.1007/s10973-020-10330-9

Cited by 4 publications

(2 citation statements)

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“…In general, the TGA indicated that the main stage of thermal degradation for samples A, M2.5, M5 and M10 occurred between 150ºC and 580°C representing a mass loss of approximately 86.16%, 71.57%, 77.93% and 83.37% for samples A, M2.5, M5 and M10, respectively. These results are in accordance with previous studies of the microalgae [ 9 , 21 , 47 , 50 , 51 ].…”

Section: Resultssupporting

confidence: 94%

“…One of the ways to produce microalgae bio-oil with less nitrogen content can be via a biomass with less protein content, once that the bio-oil composition follows the trend of the biomass elemental composition. It has been shown that microalgae under mixotrophic growth conditions reduce protein synthesis and produce more carbohydrates [18][19][20][21]. Thus, mixotrophic growth can be a sustainable strategy to produce S. platensis biomass with a lower protein content and, consequently, form a smaller amount of N-containing compounds during pyrolysis.…”

Section: Introductionmentioning

confidence: 99%

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Pyrolysis-GCMS of Spirulina platensis: Evaluation of biomasses cultivated under autotrophic and mixotrophic conditions

Paula

Chagas²,

Pereira³

et al. 2022

PLoS ONE

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Microalgae are autotrophs and CO2 fixers with great potential to produce biofuels in a sustainable way, however the high cost of biomass production is a challenge. Mixotrophic growth of microalgae has been presented as a great alternative to achieve economic sustainability. Thus, the present work reports the energetic characterization of S. platensis biomasses cultivated under autotrophic (A) and mixotrophic conditions using cheese whey waste at different concentrations, 2.5 (M2.5), 5.0 (M5) and 10.0% (M10), in order to analyze the potential production of valuable chemicals and bio-oil by TGA/DTG and Py-GC/MS. The biochemical compositions of the studied biomasses were different due to the influence of different culture mediums. As the whey concentration increased, there was an increase in the carbohydrate content and a decrease in the protein content, which influenced the elemental composition, calorific value, TGA and volatile compounds evaluated by Py-GC/MS at 450°C, 550°C and 650°C. Sample M10 had lower protein content and formed a smaller amount of nitrogenates compounds by pyrolysis at all temperatures evaluated. There was a reduction of 43.8% (450º), 45.6% (550ºC) and 23.8% (650ºC) in the formation of nitrogenates compounds in relation to sample A. Moreover, the temperature also showed a considerable effect in the formation of volatile compounds. The highest yields of nitrogenates compounds, phenols and aromatic and non-aromatic hydrocarbons were observed at 650ºC. The oxygenated, and N and O containing compounds decreased as the temperature increased. Hydrocarbons such as toluene, heptadecane and heneicosane were produced by S.platensis pyrolysis, which makes this biomass attractive for production of high quality bio-oil and valuable chemicals. Therefore, the results showed that it is possible to decrease the formation of nitrogen compounds via manipulation of growth conditions and temperature.

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