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日本エネルギー学会誌 Vol. 102 (2023), No. 9

ISIJ International
belloff
オンライン版ISSN: 1882-6121
冊子版ISSN: 0916-8753
発行機関: The Japan Institute of Energy

Backnumber

  1. Vol. 103 (2024)

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キーワードランキング

15 May. (Last 30 Days)

日本エネルギー学会誌 Vol. 102 (2023), No. 9

Microalgae Cultivation in Electrochemically Oxidized Anaerobic Digestate from Coffee Waste Biomass

Haibo CHEN, Gen YOSHIDA, Fetra J. ANDRIAMANOHIARISOAMANANA, Ikko IHARA

pp. 96-103

DOI:

10.3775/jie.102.96

抄録

Anaerobic digestate contains rich nutrients, such as nitrogen and phosphorus, which could be reused in microalgae cultivation. However, a clear growth medium is required for the cultivation to facilitate light permeable condition. The aim of this work was to investigate microalgae cultivation in electrochemically oxidized liquid digestate from coffee waste biomass. After removing the solid fraction of the digestate through microfiltration, the liquid digestate was treated by electrochemical oxidation using a boron-doped diamond anode. The liquid digestate (LD) and electrochemically oxidized liquid digestate (ELD) were used as media for microalgae cultivation.The effects of dilution from 5 to 20 times of the LD and reaction time from 1 to 5 h of the ELD on microalgae growth were also investigated. The results showed that the electrochemical oxidation had little influence on ammonium concentration in the digestate, whereas a color removal of up to 85% was observed. The ELD showed better microalgal growth performances than diluted LD, based on the data from optical density at 680 nm and cell density. The 10 times diluted, 2 h ELD achieved the best growth performance (additional optical density of 1.5 (-)) in all conditions. Our experiments proved that the ELD as a highly light permeable medium, better improved the growth performance of C. sorokiniana cultivation when compared with the LD medium.

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Facile Preparation of Fe Mo Impregnated Catalyst for Carbon Nanotube Synthesis from Eucalyptus Oil

Giang T. T. LE, BoA KYUNG, Emma ROUYRE, Sakhon RATCHAHAT, Weerawut CHAIWAT, Tawatchai CHARINPANITKUL

pp. 104-109

DOI:

10.3775/jie.102.104

抄録

Carbon nanotubes were produced via co-pyrolysis of a carbon source and catalytic metal nanoparticles. Utilization of molybdenum to iron impregnated catalyst was found to provide carbon nanotubes with superior graphitic carbon content at rather low pyrolysis temperature and higher CNT yield. In this work, a facile method to obtain Fe Mo impregnated catalyst was introduced, and eucalyptus oil was employed as main carbon source with an aim of utilizing bio-based and renewable feedstock. After impregnation and drying steps, ferrocene impregnated with molybdenum was employed for CNT synthesis without any further treatment. Repeated experimental results using Fe Mo impregnated catalyst revealed that CNT yield could be increased from 0.269 to 0.404 kg/kg when pyrolysis temperature was increased from 800 to 900 °C. Based on SEM, XRD, and Raman spectroscopic analyses, CNTs obtained from Fe Mo impregnated catalyst possessed higher graphitic content when compared to those obtained from pure ferrocene only. These results reveal a promising way to utilize FeMo impregnated catalyst for effective valorization of eucalyptus oil to produce CNTs.

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15 May. (Last 30 Days)

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