Recycling rice straw derived, activated carbon supported, nanoscaled Fe3O4 as a highly efficient catalyst for Fenton oxidation of real coal gasification wastewater

Recycled rice straw was converted into an activated carbon support for nanoscaled Fe 3 O 4 . The resulting catalyst (Fe 3 O 4 MNPs/RSAC) was then evaluated for its effectiveness in the treatment of real coal gasification wastewater (CGW), which contained strong toxins and refractory pollutants that...

Full description

Saved in:
Bibliographic Details
Published in:RSC advances 2016-10, Vol.6 (97), p.95129-95136
Main Authors: Zhuang, Haifeng, Hong, Xiaoting, Shan, Shengdao, Yuan, Xiaoli
Format: Article
Language:English
Subjects:
Biodegradability
Catalysts
Efficiency
Nanostructure
Oxidation
Straw
Sustainability
Wastewater treatment
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Recycled rice straw was converted into an activated carbon support for nanoscaled Fe 3 O 4 . The resulting catalyst (Fe 3 O 4 MNPs/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, Fe 3 O 4 MNPs/RSAC showed superior stability over ten successive runs. Moreover, heterogeneous Fenton oxidation by Fe 3 O 4 MNPs/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 Fe 3 O 4 MNPs/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. Recycled rice straw was converted into an activated carbon support for nanoscaled Fe 3 O 4 .
ISSN:2046-2069
DOI:10.1039/c6ra20952a