期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 4, 期 4, 页码 4385-4391出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2016.10.002
关键词
Catalytic ozonation process (COP); Granular MgO-SCCA-Zn catalyst; Methylene blue; Recycle
资金
- Nature Science Foundations of China [51508116, 21407155, U1501231]
- Nature Science Foundations of Guangdong Province [2016A030310265]
- Science and Technology Research Programs of Guangzhou City [201607010311]
- High level university construction project (Regional water environment safety and water ecological protection)
- Project of Guangdong Provincial Key Laboratory of radioactive contamination control and resources [2012A061400023]
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology [2016K0001]
- Open Foundation and New Plan of Guangzhou University [2001, 1517]
Heterogeneous catalytic ozonation is regarded as one of the efficient processes for degradation of organic pollutants in aqueous solution. The difficulty in separation of powder catalyst hampered the recovery and reusability of the catalyst, limiting its practical application in catalytic ozonation process (COP). Herein, Granular MgO-SCCA-Zn (G-MgO-SCCA-Zn) hybrid ozonation catalyst is synthesized by pelletizing the synthesized porous sludge derived char (SCCA-Zn) and Mg(OH)(2) mixtures. Decolorization and COD removal efficiencies of methylene blue, which was evolved as the model pollutant, were tested to evaluate the catalytic activity. Complete decolorization of MB was achieved and 50% COD was removed in the presence of G-MgO-SCCA-Zn in a determined pH of about 9 within 60 min, being higher than those in the presence of G-AC and G-MgO at the same condition. Mg2+ was not detected in the aqueous solution. The catalytic activity was almost stable upon three successive batch experiments using the G-MgO-SCCA-Zn catalyst recovered by filtration. The preferable catalytic activity is ascribed to the coupled catalytic activities of surface exposed nano MgO particles and porous SCCA-Zn. The G-MgO-SCCA-Zn could be recovered and reused in the COP due to the advantageous separation. Important information for the potential of the G-MgO-SCCA-Zn as a substitute of catalyst in the practical COP was reported for providing a new insight into the utilization of sludge char. (C) 2016 Elsevier Ltd. All rights reserved.
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