Ultrasound-assisted heterogeneous Fenton-like process for bisphenol A removal at neutral pH using hierarchically structured manganese dioxide/biochar nanocomposites as catalysts

Title
Ultrasound-assisted heterogeneous Fenton-like process for bisphenol A removal at neutral pH using hierarchically structured manganese dioxide/biochar nanocomposites as catalysts
Authors
최재우정경원Seon Yong LeeYoung Jae Lee
Keywords
Bisphenol A; Ultrasound-assisted heterogeneous Fenton-like; Urchin-like a-MnO2; Biochar; Nanocomposites
Issue Date
2019-10
Publisher
Ultrasonics sonochemistry
Citation
VOL 57-28
Abstract
Bisphenol A (BPA) is an important emerging contaminant with endocrine-disrupting potential that has frequently been detected in aquatic environments. In this study, two types of hierarchically structured manganese dioxide/biochar nanocomposites (MnO2/BCs) were prepared for the first time via facile hydrothermal synthesis. The hydrothermal reaction was maintained at 100  °C for 6  h or 12  h, after which an ultrasound-assisted heterogeneous Fenton-like process was used to catalyze the removal of BPA under neutral pH condition. The characterization results indicated that MnO2 nanoparticles were successfully formed on the nanocomposite surfaces and had flower-like (δ-MnO2, 6  h) and urchin-like (α-MnO2, 12  h) morphology. This enabled a significant improvement in the catalytic activity of BPA removal by the reversible redox reaction. A series of experiments confirmed that the crystalline properties of the nanocomposites affected their catalytic activity. In particular, the α-MnO2/BCs exhibited catalytic activity in the ultrasound-assisted heterogeneous Fenton-like process and completely removed BPA within 20  min under the following conditions: [BPA]0  =  100  μM; [H2O2]0  10  mM; [catalyst]0  0.5  g/L; ultrasound  20  kHz (130  W) at 40% amplitude; pH  7.0  ±  0.1; and temperature  25  1  °C. This efficiency may have been due to the synergistic effect of ultrasound and α-MnO2/BCs, which simultaneously induce the effective generation of reactive free radicals and increase the mass transfer rate at the solid-liquid interface. Overall, these results demonstrated that hierarchical urchin-like α-MnO2/BCs have significant potential as an efficient and low-cost catalyst in ultrasound-assisted heterogeneous Fenton-like systems.
URI
http://pubs.kist.re.kr/handle/201004/69349
ISSN
1350-4177
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