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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.