4.7 Article

Effective removal of organic dyes using the ultrasonic-assisted hydrothermal synthesis of NaP zeolite doping Cu or Fe in Fenton-like oxidation systems

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ELSEVIER
DOI: 10.1016/j.seppur.2022.121767

关键词

Ultrasonic-assisted; NaP zeolite; Transition metals; Oxidation removal; Organic dyes

资金

  1. Program for National Natural Science Foundation of China [51674089, 21908021]
  2. High -Level Talent Project of Heilongjiang Province of China [2020GSP17]
  3. New Energy and New Direction Project of Northeast Petroleum University [XNYXLY202102]

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NaP zeolite was synthesized successfully using ultrasonic-assisted hydrothermal synthesis. Different approaches for Cu or Fe doping were tested. Cu-NaPultra zeolite showed superior oxidation performance in removing organic dyes.
NaP zeolite was successfully synthesized via ultrasonic-assisted hydrothermal synthesis. The approaches for Cu or Fe doping were screened. Additionally, the oxidation process of methylene blue (MB) and methyl violet-6B (MV-6B) by the doped NaPultra zeolites was surveyed. NaPultra zeolite exhibited higher crystallinity (94.99%), while the crystallization temperature and duration decreased from 120 ?C to 90 ?C and from 8 h to 4 h with the n (SiO2)/n(Al2O3) increasing from 2.0 to 4.0, compared to the hydrothermal synthesis. At the ultrasonic power intensity of 30% and the density of 60 mL/W, the conversion rates of Si and Al rosed from 66.46% to 84.68% and from 73.75% to 95.25%, respectively. Comparatively, the complexation approach demonstrated superior findings in the crystallinity (Fe-NaPultra: 92.37% and Cu-NaPultra: 94.14%) at the n(Fe(NO3)(3)):n(Al2O3) ratio of 1:4 and the n(Cu(NO3)(2)):n(Al2O3) ratio of 1:6. The ultrasonic resulted in the smaller crystal sizes for Fe-NaPultra (1.90 mu m) and Cu-NaPultra (1.80 mu m). Cu-NaPultra displayed better oxidation performance in the elimination of MB (93.22%) and MV-6B (98.71%) via the HO center dot at the condition of pH = 5.0, 30 min, 2.5 g/L, 50 mg/L, and 25 ?C. Through the combined action of adsorption and Fenton-like oxidation, the rapid enrichment of organic dyes by the zeolite was realized, and the dyes were removed efficiently. Cu-NaPultra was capable of retaining good removal performance throughout four cycles, suggesting that it is a promising catalyst for Fenton-like oxidation reactions and may help to pave the way for the removal of organic dyes.

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