Inorganic Chemicals Industry ›› 2023, Vol. 55 ›› Issue (4): 111-119.doi: 10.19964/j.issn.1006-4990.2022-0370

• Catalytic Materials • Previous Articles     Next Articles

Catalytic degradation of Rhodamine B by ferroferric oxide-loaded bacterial residue biochar

LIU Rui1(), GAO Wei1, ZHANG Wenjing2,3, AN Hongxue2,3, LI Zaixing2,3()   

  1. 1. School of Civil Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China
    2. School of Environmental Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China
    3. State Key Laboratory Breeding Base-Hebei Province Key Laboratory of Molecular Chemistry for Drug,Shijiazhuang 050018,China
  • Received:2022-06-17 Online:2023-04-10 Published:2023-04-13

Abstract:

Considering the high cost of catalyst carriers,it is significant to seek cheap carrier preparation method for synthesizing catalysts.The porous biochar(PRBC) was prepared as the carrier by pyrolysis of penicillin residue,and Fe3O4@PRBC was synthesized by co-precipitation loaded with Fe3O4.The catalysts were characterized by SEM,XRD,FT-IR and pore structure analysis,and the effects of different systems,catalyst dosage,H2O2 dosage,solution pH and Rhodamine B(RhB) concentration on the treatment effect were investigated by using RhB as the target degradation pollutant.The results showed that Fe3O4 was successfully loaded on biochar,and the surface of Fe3O4@PRBC was rough and porous with a specific surface area of 1 210.54 m²/g.The H2O2/Fe3O4 @PRBC system showed outstanding catalytic characteristics.When the dosage of Fe3O4@PRBC was 0.8 g/L,H2O2 dosage was 30 mmol/L,the degradation rate of RhB was exceeded 90% in the range of pH=3~11.After recycling for 4 times,the degradation rate could still reach 90%.The free radical quenching experiment showed that the main active substances that catalyzed the degradation of RhB were ·OH and ·O2-.The Fenton-like degradation test was carried out on actual printing and dyeing wastewater,the COD removal rate was higher than 80%,and the chromaticity removal rate reached 100%.

Key words: biochar, Fe3O4, heterogeneous Fenton, Rhodamine B, penicillin residue

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