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Heterogeneous fenton oxidation of methylene blue with Fe-impregnated biochar catalyst

Authors
Park, Jong-HwanWang, Jim J.Park, Ki HunSeo, Dong-Cheol
Issue Date
Jun-2020
Publisher
SPRINGER SINGAPORE PTE LTD
Keywords
Fe-impregnated biochar catalyst; Heterogeneous fenton reaction; Impregnation and pyrolysis; Removal velocity; Methylene blue; Sugarcane residue
Citation
BIOCHAR, v.2, no.2, pp 165 - 176
Pages
12
Indexed
SCOPUS
Journal Title
BIOCHAR
Volume
2
Number
2
Start Page
165
End Page
176
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/6536
DOI
10.1007/s42773-020-00051-5
ISSN
2524-7972
2524-7867
Abstract
Fe-impregnated biochar (Fe-BC) as high-efficiency heterogeneous Fenton catalyst was synthesized and evaluated in detail for its catalytic activity, stability and reusability under various conditions. The optimal conditions for the Fenton oxidation of methylene blue (MB) as model dye were determined as 0.075 g/L H2O2, 0.5 g/L Fe-BC for 0.1 g/L MB, which resulted in optimum Dye:Fe-cat:H2O2 ratio of 1:5:0.75 (on g/L basis) or [Dye]:[Fe-total]:[H2O2] molar ratio of 1:6.2:7.0 respectively. The effective degradation of MB was identified over a wider pH range, and even after four consecutive runs Fe-BC maintained above 95% MB removal rate within 3 min of treatment with low Fe release, indicating strong stability and reusability. Under the optimum Dye:Fe-cat:H2O2 (g/L) condition at initial pH 4, the Fe-BC achieved 99.9% removal efficiency of MB within 3 min in heterogeneous Fenton reaction (HEFR) with much less H2O2 concentration and low catalyst dosage, demonstrating its efficiency and cost-effectiveness compared to other Fenton reaction catalysts. The removal velocity of MB showed two rate steps: a fast first stage followed by a slow stage with the rate in the order of H2O2/Fe-BC?H2O2/biochar>biochar>H2O2. Overall, the developed Fe-BC is more economical with strong stability and recyclability for use in HEFR for treating recalcitrant pollutants.
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