Sodium Percarbonate Activation by Plasma-Generated Ozone for Catalytic Degradation of Dye Wastewater: Role of Active Species and Degradation Process
In this paper, sodium percarbonate (SPC) was activated by ozone (O<sub>3</sub>) from plasma for catalytic treatment of dye wastewater. Methyl blue (MB), a typical industrial dye, was selected as the target dye contaminant. Results showed that enhancing O<sub>3</sub> dosage an...
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MDPI AG
2022-06-01
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| author | Jingwen Huang Chendong Puyang He Guo |
| author_facet | Jingwen Huang Chendong Puyang He Guo |
| author_sort | Jingwen Huang |
| collection | DOAJ |
| description | In this paper, sodium percarbonate (SPC) was activated by ozone (O<sub>3</sub>) from plasma for catalytic treatment of dye wastewater. Methyl blue (MB), a typical industrial dye, was selected as the target dye contaminant. Results showed that enhancing O<sub>3</sub> dosage and reducing MB concentration were beneficial to MB degradation. Compared to acid condition, a higher removal efficiency of MB was obtained in alkaline condition. With an increase of SPC dosage, the removal efficiency of MB first was raised, and then it declined. Under the optimal dosage of 50 mg/L, the removal efficiency of MB reached 85.7% with 30 min treatment time. The energy efficiency was improved from 5.21 g/kWh to 5.71 g/kWh. A synergetic effect can be established between O<sub>3</sub> and SPC. Radical capture experiments verified that <b>·</b>OH, <b>·</b>O<sub>2</sub><sup>−</sup>, <sup>1</sup>O<sub>2</sub>, and <b>·</b>CO<sub>3</sub><sup>−</sup> played important parts in MB degradation. With increasing reaction time, the amount of total organic carbon (TOC) declined and the amount of ammonia nitrogen (NH<sub>3</sub>-N) increased. The addition of SPC enhanced the solution’s pH value and conductivity. The degradation pathway was proposed based on density functional theory (DFT) analysis and relevant literatures. The toxicity of MB was alleviated after O<sub>3</sub>/SPC treatment. The O<sub>3</sub>/SPC process was also suitable for the treatment of other dyes and actual wastewater. |
| first_indexed | 2024-03-09T03:35:17Z |
| format | Article |
| id | doaj.art-2840a92a41904001be44722cb7724ec1 |
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| language | English |
| last_indexed | 2024-03-09T03:35:17Z |
| publishDate | 2022-06-01 |
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| spelling | doaj.art-2840a92a41904001be44722cb7724ec12023-12-03T14:48:23ZengMDPI AGCatalysts2073-43442022-06-0112768110.3390/catal12070681Sodium Percarbonate Activation by Plasma-Generated Ozone for Catalytic Degradation of Dye Wastewater: Role of Active Species and Degradation ProcessJingwen Huang0Chendong Puyang1He Guo2College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, ChinaCollege of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, ChinaCollege of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, ChinaIn this paper, sodium percarbonate (SPC) was activated by ozone (O<sub>3</sub>) from plasma for catalytic treatment of dye wastewater. Methyl blue (MB), a typical industrial dye, was selected as the target dye contaminant. Results showed that enhancing O<sub>3</sub> dosage and reducing MB concentration were beneficial to MB degradation. Compared to acid condition, a higher removal efficiency of MB was obtained in alkaline condition. With an increase of SPC dosage, the removal efficiency of MB first was raised, and then it declined. Under the optimal dosage of 50 mg/L, the removal efficiency of MB reached 85.7% with 30 min treatment time. The energy efficiency was improved from 5.21 g/kWh to 5.71 g/kWh. A synergetic effect can be established between O<sub>3</sub> and SPC. Radical capture experiments verified that <b>·</b>OH, <b>·</b>O<sub>2</sub><sup>−</sup>, <sup>1</sup>O<sub>2</sub>, and <b>·</b>CO<sub>3</sub><sup>−</sup> played important parts in MB degradation. With increasing reaction time, the amount of total organic carbon (TOC) declined and the amount of ammonia nitrogen (NH<sub>3</sub>-N) increased. The addition of SPC enhanced the solution’s pH value and conductivity. The degradation pathway was proposed based on density functional theory (DFT) analysis and relevant literatures. The toxicity of MB was alleviated after O<sub>3</sub>/SPC treatment. The O<sub>3</sub>/SPC process was also suitable for the treatment of other dyes and actual wastewater.https://www.mdpi.com/2073-4344/12/7/681sodium percarbonateozoneMBhydrogen peroxideactive species |
| spellingShingle | Jingwen Huang Chendong Puyang He Guo Sodium Percarbonate Activation by Plasma-Generated Ozone for Catalytic Degradation of Dye Wastewater: Role of Active Species and Degradation Process Catalysts sodium percarbonate ozone MB hydrogen peroxide active species |
| title | Sodium Percarbonate Activation by Plasma-Generated Ozone for Catalytic Degradation of Dye Wastewater: Role of Active Species and Degradation Process |
| title_full | Sodium Percarbonate Activation by Plasma-Generated Ozone for Catalytic Degradation of Dye Wastewater: Role of Active Species and Degradation Process |
| title_fullStr | Sodium Percarbonate Activation by Plasma-Generated Ozone for Catalytic Degradation of Dye Wastewater: Role of Active Species and Degradation Process |
| title_full_unstemmed | Sodium Percarbonate Activation by Plasma-Generated Ozone for Catalytic Degradation of Dye Wastewater: Role of Active Species and Degradation Process |
| title_short | Sodium Percarbonate Activation by Plasma-Generated Ozone for Catalytic Degradation of Dye Wastewater: Role of Active Species and Degradation Process |
| title_sort | sodium percarbonate activation by plasma generated ozone for catalytic degradation of dye wastewater role of active species and degradation process |
| topic | sodium percarbonate ozone MB hydrogen peroxide active species |
| url | https://www.mdpi.com/2073-4344/12/7/681 |
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