Heat and iron-activated persulfate for Orange G degradation: Kinetics and synergy effect studies
This study explores the advanced oxidation process degradation of Orange G (OG) in an aqueous solution using heat activated persulfate (PS) oxidation. Many factors, including reaction temperature (20–70°C), pH (2−12), potassium persulfate (PSP) dosage (100–1000 mg.L−1), initial OG concentration (10–...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-04-01
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| Series: | Desalination and Water Treatment |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1944398625001067 |
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| Summary: | This study explores the advanced oxidation process degradation of Orange G (OG) in an aqueous solution using heat activated persulfate (PS) oxidation. Many factors, including reaction temperature (20–70°C), pH (2−12), potassium persulfate (PSP) dosage (100–1000 mg.L−1), initial OG concentration (10–70 mg/L), FeSO4.7H2O (10–50mg/L) and (NH4)2Fe (SO4)2 (8–100 mg/L), as well as the impact of organic additions, were examined to determine their effectiveness. According to our results, OG oxidation followed a pseudo-first-order kinetic model, exhibiting a strong correlation coefficient (R2=0.99). Complete decolorisation of 50 mg/L OG was achieved in 150 min and 240 min at reaction temperatures of 70°C and 65°C, respectively, in the presence of 1 g/L of PS. The apparent activation energy was found to be 157.3 kJ/mol. Furthermore, the results suggest a direct correlation between OG oxidation and high initial PS concentrations, while an inverse relationship was observed with initial substrate concentrations. In addition, higher reaction temperatures and a neutral initial pH favoured OG degradation. Furthermore, the results demonstrated that the sulfate radical SO4•− was responsible for OG oxidation. Moreover, the coexistence of ferrous ions and PSP at high temperatures synergistically accelerated the OG oxidation. These results suggest that the heat/PS process and/or the PS/heat/ Fe2+ process holds great promise for reducing azo dyes in aqueous media. |
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| ISSN: | 1944-3986 |