Journal
CHEMICAL ENGINEERING JOURNAL
Volume 428, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132578
Keywords
Microalgae; Biochar catalyst; Co-pyrolysis; Persulfate; Methyl orange
Categories
Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2021R1A2C1010564]
- Basic Research Project of the Korea Institute of Geoscience and Mineral Resources [21-3412-1]
- National Research Council of Science & Technology (NST), Republic of Korea [21-3412] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2021R1A2C1010564] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study explores the feasibility of simultaneously producing synthetic gases and metal-biochar catalyst through co-pyrolysis of microalgae and industrial waste. The results show that CO2 atmosphere significantly enhances CO production and the effect is more pronounced when industrial waste is incorporated. The produced metal-biochar has a porous structure and catalytic capability, effectively removing methyl orange. This research is important for utilizing biomass waste for energy production and treating redox active contaminants.
Y This study explored the feasibility of simultaneously producing synthetic gases and metal-biochar catalyst from co-pyrolysis of microalgae (chlorella vulgaris, CV) and industrial waste (bauxite tailings, BT). Co-pyrolysis was conducted in two different atmospheric conditions of N-2 and CO2. Real-time syngas monitoring revealed the use of CO2 substantially enhanced CO production by expediting CO2-medicated thermal cracking of CV and its impact was further pronounced when BT was incorporated in the pyrolytic process. Characterization of produced metal-biochar revealed that metal-biochar have porous structure, Fe3O4 phase, and graphitic carbon layers with defective sites. The metal-biochar removed > 72% of 5 mg L-1 methyl orange within 60 min in the presence of 2 mM peroxydisulfate at 0.1 g L-1 biochar dose. Quenching test revealed the removal of methyl orange was mainly driven by singlet oxygen (O-1(2)) generated by persulfate activation by metal-biochar. The reusability test indicated metal-biochar maintained>80% of its catalytic capability up to five repetitive reaction cycles of methyl orange removal. Collectively, co-pyrolysis of microalgae and industrial waste containing transition metals in CO2 condition can be a viable option to harvest energy resources from biomass wastes and to produce catalytic medium applicable to remove a wide range of redox active contaminants.
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