Recycling rice straw derived, activated carbon supported, nanoscaled Fe3O4 as a highly efficient catalyst for Fenton oxidation of real coal gasification wastewater
| Autor: | Xiaoting Hong, Haifeng Zhuang, Shengdao Shan, Xiaoli Yuan |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
inorganic chemicals
Pollutant Reaction mechanism General Chemical Engineering Cyanide 02 engineering and technology General Chemistry 010501 environmental sciences Biodegradation 021001 nanoscience & nanotechnology Pulp and paper industry 01 natural sciences Catalysis chemistry.chemical_compound Wastewater chemistry medicine Phenols 0210 nano-technology 0105 earth and related environmental sciences Activated carbon medicine.drug |
| Zdroj: | RSC Advances. 6:95129-95136 |
| ISSN: | 2046-2069 |
| Popis: | Recycled rice straw was converted into an activated carbon support for nanoscaled Fe3O4. The resulting catalyst (Fe3O4MNPs/RSAC) was then evaluated for its effectiveness in the treatment of real coal gasification wastewater (CGW), which contained strong toxins and refractory pollutants that were poorly biodegradable. The results indicated that Fenton oxidation with the prepared catalyst was a highly efficient means of treatment for CGW over a wide pH range: the corresponding COD, cyanide and total phenols (TPh) removal efficiencies were 55.5, 46.5 and 85.5%, respectively. The treated wastewater was more biodegradable and less toxic, which aided in subsequent processing. The efficiency enhancement was attributed to the generation of more hydroxyl radicals and a possible reaction mechanism was proposed. Furthermore, Fe3O4MNPs/RSAC showed superior stability over ten successive runs. Moreover, heterogeneous Fenton oxidation by Fe3O4MNPs/RSAC also enhanced the aerobic biodegradation of CGW. Overall, 92.9% of COD and 98.5% of TPh were removed via the integration of Fenton oxidation and biological processing. Thus, the catalysis of Fenton oxidation by Fe3O4MNPs/RSAC was efficient, cost-effective and sustainable with a beneficial engineering application in the treatment of refractory wastewater, and a new and sustainable use for waste rice straw. |
| Databáze: | OpenAIRE |
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