Volume 40 Issue 11
Nov.  2023
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HUANG Jian, SUN Yunyun, ZHANG Hua, et al. Preparation and adsorption mechanism of NHFO@pumice for ammonia nitrogen[J]. Acta Materiae Compositae Sinica, 2023, 40(11): 6130-6138. doi: 10.13801/j.cnki.fhclxb.20230222.010
Citation: HUANG Jian, SUN Yunyun, ZHANG Hua, et al. Preparation and adsorption mechanism of NHFO@pumice for ammonia nitrogen[J]. Acta Materiae Compositae Sinica, 2023, 40(11): 6130-6138. doi: 10.13801/j.cnki.fhclxb.20230222.010

Preparation and adsorption mechanism of NHFO@pumice for ammonia nitrogen

doi: 10.13801/j.cnki.fhclxb.20230222.010
Funds:  National Key Research and Development Program (2019YFC0408504); Provincial Natural Science Research Project of Higher Education in Anhui Province (KJ2019ZD52; KJ2020A0466; KJ2021A0619); Introduction of Talents and Doctoral Program of Anhui Jianzhu University (2019QDZ64; 2019QDZ60)
  • Received Date: 2022-11-10
  • Accepted Date: 2023-02-15
  • Rev Recd Date: 2022-12-15
  • Available Online: 2023-02-23
  • Publish Date: 2023-11-01
  • Both pumice and nano hydrous iron oxide (NHFO) are commonly used adsorbents in water treatment. In this study, NHFO was loaded onto pumice by co-precipitation method to explore its adsorption performance and mechanism of ammonia nitrogen. The effects of initial ammonia concentration, initial pH value and co-existing ions (H+, Na+, K+, Mg2+) on NHFO@pumice adsorption of ammonia nitrogen were investigated. SEM-EDS and XRD were used to characterize the morphology and structure of NHFO@honeycomb. The results show that the initial concentration of ammonia nitrogen is 20 mg/L and the pH value is around 7. The co-existing ions have an inhibitory effect on the adsorption of ammonia nitrogen, and the inhibitory strength is H+>Na+>K+>Mg2+. SEM-EDS, XRD, FTIR and other characterization methods confirmed that NHFO was successfully loaded on the honeycomb, and the adsorption process was consistent with Langmuir adsorption isotherm (R2=0.9886) and quasi second-order kinetic model (R2=0.9969). The mechanism of ammonia nitrogen adsorption mainly includes electrostatic interaction of hydroxyl group and NH4+, ion exchange and pore adsorption. This study provides a theoretical basis for the treatment of ammonia-nitrogen water by adsorption.

     

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