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Catalytic pyrolysis of the Eupatorium adenophorum to prepare photocatalyst-adsorbent composite for dye removal
- Cheng, Song, Hu, Wenhai, Srinivasakannan, C., Xia, Hongying, Zhang, Libo, Peng, Jinhui, Zhou, Junwen, Lin, Guo, Zhang, Qi
- Journal of cleaner production 2019 v.222 pp. 710-721
- Ageratina adenophora, activated carbon, adsorption, aqueous solutions, biogas, carbon monoxide, catalysts, economic analysis, hydrogen, irradiation, magnetic fields, magnetic properties, methylene blue, photocatalysis, pyrolysis, weeds, zinc oxide
- Eupatorium adenophorum, a kind of pernicious weed, is used to produce a photocatalyst-adsorbent composite, consisting of ZnOFe3O4 particles on the surface of activated carbon, and bio-gas via catalytic pyrolysis. The photocatalyst-adsorbent composite was characterized by several characterization methods. The results show that the photocatalyst-adsorbent composite possesses adsorptive, photocatalytic degradative and magnetic properties. Methylene blue, a kind of dye, is used to evaluate the adsorption and photocatalytic degradation performance of photocatalyst-adsorbent composite. The maximum amount of methylene blue adsorption in photocatalyst-adsorbent composite was as high as 330.03 mg/g based on the adsorption experiment in dark conditions. The photocatalyst-adsorbent composite had good degradation performance with methylene blue, which was found to be 20.78% more efficient than the ZnO catalyst and 205% more efficient than the adsorption under ultra violet light irradiation. Photocatalyst-adsorbent composite could be conveniently separated from the aqueous solution by using an external magnetic field. The bio-gas was collected from the pyrolysis process, which mainly consisted of H2 and CO. The production cost of the photocatalyst-adsorbent composite is US$ 1,361/t based on the preliminary economic analysis.