Volume 40 Issue 2
Feb.  2023
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ZENG Taotao, NONG Haidu, SHA Haichao, et al. Performance and mechanism of Cr(VI) removal by sludge-derived biochar loaded with nanoscale zero-valent iron[J]. Acta Materiae Compositae Sinica, 2023, 40(2): 1037-1049. doi: 10.13801/j.cnki.fhclxb.20220324.001
Citation: ZENG Taotao, NONG Haidu, SHA Haichao, et al. Performance and mechanism of Cr(VI) removal by sludge-derived biochar loaded with nanoscale zero-valent iron[J]. Acta Materiae Compositae Sinica, 2023, 40(2): 1037-1049. doi: 10.13801/j.cnki.fhclxb.20220324.001

Performance and mechanism of Cr(VI) removal by sludge-derived biochar loaded with nanoscale zero-valent iron

doi: 10.13801/j.cnki.fhclxb.20220324.001
Funds:  National Natural Science Foundation of China (52170164); Opening Funding for Innovation Platform of Education Department in Hunan Province (19K081)
  • Received Date: 2022-01-10
  • Accepted Date: 2022-03-13
  • Rev Recd Date: 2022-03-08
  • Available Online: 2022-03-25
  • Publish Date: 2023-02-15
  • Chromium-containing wastewater was generated in electroplating, metallurgy, printing and dyeing industries, which caused environmental pollution. The sludge-derived biochar (SB) was obtained from the pyrolysis of municipal sludge, and then loaded with nanoscale zero-valent iron (nZVI) to prepare sludge-derived biochar loaded with nanoscale zero-valent iron (nZVI-SB) for the removal of Cr(VI) from water. The effect of the iron to carbon mass ratio, initial pH value, dosage and temperature on the removal of Cr(VI) were explored. SEM-EDS, XRD and XPS were used to characterize the mechanisms of Cr(VI) removal. The results show that nZVI-SB has a desirable removal capacity for Cr(VI). Under the conditions of dosage 0.5 g/L, pH=2 and 40℃, the maximum adsorption capacity of Cr(VI) is 150.60 mg/g by nZVI-SB(1∶1) with a mass ratio of 1∶1 between Fe and SB. The Cr(VI) removal process can be fitted by Langmuir adsorption isotherm and pseudo-second-order kinetic equations. The removal mechanisms of Cr(VI) mainly include adsorption, reduction and co-precipitation. The present study confirms SB and nZVI can synergically remove Cr(VI).

     

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