Study on Bi2WO6-O3 Synergistic Catalytic Degradation of Dye Wastewater
Shijiazhuang Key Laboratory of Low Carbon Energy Materials, College of Chemical Technology, Shijiazhuang University, Shijiazhuang 050035, China
| Abstract: | Two Bi2WO6 photocatalysts with different morphology characteristics were prepared by hydrothermal method. The morphology and structure of the samples were characterized by a series of methods such as SEM and XRD, verifying that increasing the reaction temperature to a certain extent during the hydrothermal preparation of Bi2WO6 photocatalysts can improve the morphology and structure of Bi2WO6. The use of methylene blue (MB) solution as a simulated industrial organic wastewater for single variable parallel experiments and orthogonal experiments of Bi2WO6 and O3 verifies the synergistic effect of Bi2WO6 and ozone (Bi2WO6/O3) in photocatalytic treatment. We jointly investigated the conditions of catalyst dosage, ozone dosage, pH, and optimized the treatment conditions and process parameters to optimize the synergistic treatment effect, providing a theoretical basis for treating actual wastewater. The results show that when the catalyst dosage is 3g/L and O3 dosage is 0.05m3/h. When the pH value is 7, the highest degradation rate of Bi2WO6/O3 can reach 98.8%, which is 7.77 times that of Bi2WO6 monomer and 1.48 times that of O3 monomer. In addition, based on the experimental results, a preliminary prediction was made on the mechanism of Bi2WO6/O3 degrading MB under visible light: the holes (h+) generated by Bi2WO6 played the main role in MB degradation, followed by the•O2- group generated by the joint action of Bi2WO6 and O3. This indicates that within a certain amount of O3 addition range, Bi2WO6 has a greater impact on sewage treatment than O3. |
| Keywords: | Bi2WO6; Methylene Blue (MB); Ozone; Degradation |
| DOI: | 10.57237/j.res.2023.03.001 |
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Received: 17 April 2023
Accepted: 23 May 2023
Published Online: 9 October 2023
Funding
| 1. | 河北省自然科学基金青年基金 (B2021106003) |
| 2. | 河北省高等学校青年拔尖人才计划项目 (BJ2021097) |
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