Highly efficient degradation of lactic acid by microwave-induced activated carbon catalytic oxidation process
High-concentration refractory coffee wastewater containing about 2,000 mg/L of biotoxic lactic acid is treated by microwave technology. At a microwave power of 900 W, a large amount of activated carbon (AC) reduces the number of hot spots. After microwave radiation, the lactic acid concentration drops to 200 mg/L, with a removal rate of 90%. CaO promotes the process. In the microwave-AC-CaO method, "hotspots" on AC generate free radicals. The effects of microwaves degrade lactic acid into CO<sub>2</sub> and H<sub>2</sub>O. The microwave-AC-CaO method can rapidly degrade lactic acid. The degradation rate of lactic acid can be further improved by adding transition-metal oxides to modify AC.
Authors
- Yiyang Peng (ORCID: https://orcid.org/0000-0002-8077-9784)
- Yungen Liu (ORCID: https://orcid.org/0000-0002-2473-6173)
- Fanfan Liang (ORCID: https://orcid.org/0009-0002-0928-142X)
- Yan Wang (ORCID: https://orcid.org/0000-0001-9417-0550)
- Silin Yang
Institutions
- Southwest Forestry University (CN)
- Yunnan Environmental Protection Bureau (CN)
Publication Details
- Journal
- iScience
- Published
- 2025-05-19
- DOI
- https://doi.org/10.1016/j.isci.2025.112694
- Primary Topic
- Catalytic Processes in Materials Science
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Major Science and Technology Projects in Yunnan Province