Nano-sized magnetic iron oxides as catalysts for heterogeneous Fenton-like reactions—Influence of Fe(II)/Fe(III) ratio on catalytic performance

2012 ◽  
Vol 241-242 ◽  
pp. 433-440 ◽  
Author(s):  
Klara Rusevova ◽  
Frank-Dieter Kopinke ◽  
Anett Georgi
Keyword(s):  
Iron Oxides ◽  
Catalytic Performance ◽  
Heterogeneous Fenton

The Synthesis of Iron Oxides with Different Phases or Exposure Crystal Planes and their Catalytic Property for Propene Oxidation

2012 ◽  
Vol 463-464 ◽  
pp. 189-193
Author(s):  
Kong Zhai Li ◽  
Masaaki Haneda ◽  
Masakuni Ozawa
Keyword(s):  
Catalytic Activity ◽  
Iron Oxides ◽  
Catalytic Property ◽  
Significant Influence ◽  
Catalytic Performance ◽  
Selective Growth ◽  
Crystal Plane ◽  
Low Density ◽  
Fe2o3 Nanoparticles ◽  
Propene Oxidation

Maghemite (γ-FeSubscript text2OSubscript text3) and hematite (α-Fe2O3) nanoparticles with various dominant exposure crystal planes were prepared by several different methods. The structure and the reducibility of these materials were investigated by XRD, Raman and H2-TPR technologies, and their catalytic performance for propene oxidation was also discussed. The maghemite (γ-FeSubscript text2OSubscript text3) showed a better reducibility than hematite (α-FeSubscript text2OSubscript text3), but its activity for propene oxidation is relatively lower. The exposure crystal plane of hematite has a significant influence on its catalytic activity for propene oxidation. Among the prepared four samples, the hematite-1 sample showed the best activity. The selective growth of any planes with a relative low density of Fe atoms for the α-FeSubscript text2OSubscript text3 catalyst would lead to an obvious decrease in the catalytic activity.

Application of S2O82-/FexOy Solid Super Acid as a Heterogeneous Fenton-Like Catalyst for the Degradation of Orange IV in Water

2010 ◽  
Vol 150-151 ◽  
pp. 1710-1713
Author(s):  
Ying Jie Zhang ◽  
Yue Xiao Tian ◽  
Da Peng Li ◽  
Guo Rui Liu ◽  
Li Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Iron Oxides ◽  
Catalytic Decomposition ◽  
Optimal Conditions ◽  
Heterogeneous Fenton ◽  
Effective Catalyst ◽  
Preparation Conditions ◽  
Super Acid ◽  
Decomposition Of H2o2

A new Fenton-like catalyst was prepared to degrade Orange IV in water by catalytic decomposition of H2O2. The optimal preparation conditions were discussed. The catalytic activity of catalyst was evaluated by the degradation of Orange IV and the decomposition of H2O2. The results show that solid super acid (S2O82-/FexOy) soaked in (NH4)2S2O8 is the most effective catalyst among the synthesized iron oxides soaked in other oxidants. The optimal conditions for solid super acid preparation are calcined at 500 for 2 h in the air.

Highly active heterogeneous Fenton-like systems based on Fe0/Fe3O4 composites prepared by controlled reduction of iron oxides

2008 ◽  
Vol 83 (1-2) ◽  
pp. 131-139 ◽  
Author(s):  
Regina C.C. Costa ◽  
Flávia C.C. Moura ◽  
J.D. Ardisson ◽  
J.D. Fabris ◽  
R.M. Lago
Keyword(s):  
Iron Oxides ◽  
Heterogeneous Fenton ◽  
Highly Active ◽  
Reduction Of Iron

Preparative treatment with NaOH to selectively concentrate iron oxides of a Chilean volcanic soil material to produce effective heterogeneous Fenton catalyst

2011 ◽  
Vol 203 (1-3) ◽  
pp. 59-66 ◽  
Author(s):  
Valentina Manzo ◽  
Carmen Pizarro ◽  
María Angélica Rubio ◽  
Luis Carlos Duarte Cavalcante ◽  
Vijayendra Kumar Garg ◽  
...  
Keyword(s):  
Iron Oxides ◽  
Volcanic Soil ◽  
Heterogeneous Fenton ◽  
Soil Material ◽  
Fenton Catalyst ◽  
Heterogeneous Fenton Catalyst

Preparative treatment with NaOH to selectively concentrate iron oxides of a Chilean volcanic soil material to produce effective heterogeneous Fenton catalyst

LACAME 2010 ◽  
2011 ◽  
pp. 217-224
Author(s):  
Valentina Manzo ◽  
Carmen Pizarro ◽  
María Angélica Rubio ◽  
Luis Carlos Duarte Cavalcante ◽  
Vijayendra Kumar Garg ◽  
...  
Keyword(s):  
Iron Oxides ◽  
Volcanic Soil ◽  
Heterogeneous Fenton ◽  
Soil Material ◽  
Fenton Catalyst ◽  
Heterogeneous Fenton Catalyst

Degradation of Chrysoidin Dye by Fenton and Photo-Fenton Reaction Using Natural Marmatite as Catalyst

2014 ◽  
Vol 17 (2) ◽  
Author(s):  
J. H. Ramirez ◽  
H. R. Zea ◽  
Thomas Cramer
Keyword(s):  
Photocatalytic Degradation ◽  
Gold Deposit ◽  
Iron Oxides ◽  
Azo Dye ◽  
Fenton Reaction ◽  
Active Material ◽  
Heterogeneous Fenton ◽  
Solution Ph ◽  
Photo Catalyst ◽  
Degradation Of Azo Dye

AbstractHeterogeneous dark Fenton and photocatalytic degradation of azo-dye chrysoidin were studied using natural marmatite from a Colombian gold deposit as catalysts. Marmatite is composed of zinc sulfates, iron sulfates and iron oxides; due to this composition marmatite is an active material in the degradation of chrysoidin. Marmatite was characterized by SEM, XRD, BET and XRF. Experimental results allow concluding that the dye was oxidized (degraded) in both, heterogeneous Fenton and photo-catalyst reactions, using Marmatite as catalyst. The variables considered were solution pH, marmatite concentration, C

scholarly journals Fe3O4-NPs/Orange-Peel composite as magnetic heterogeneous Fenton-like catalyst towards high-efficiency degradation of methyl orange

2021 ◽  
Author(s):  
Qiang Zhao ◽  
Congcong Zhang ◽  
Xiaoqiang Tong ◽  
Yunling Zou ◽  
Yan Li ◽  
...  
Keyword(s):  
Methyl Orange ◽  
High Efficiency ◽  
Low Cost ◽  
Orange Peel ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Heterogeneous Fenton ◽  
Fe3o4 Nps ◽  
Degradation Ratio ◽  
Co Precipitation

Abstract Fe3O4-NPs/orange-peel (MOP) composite was prepared via one-step in-situ co-precipitation method as magnetic heterogeneous Fenton-like catalyst. The properties of MOP were characterized by SEM, TEM, BET, XRD, FT-IR, TGA and XPS technologies. Its Fenton-like catalytic responses towards removal of methyl orange (MO) were investigated, in which the effects of initial dye concentration, pH, temperature and H2O2 dosage were studied. The MO degradation ratio up to 98.0% was obtained within 20 min in optimized conditions. The catalyst also shows excellent catalytic stability exhibiting nearly 90% degradation ratio in 10th cycle within 20 min, whereas pure Fe3O4-NPs showing only 62.5% in this stage. Due to the stabilization of complexing orange peel hydroxyl to Fe oxide in the composite and its magnetic separation property, Fe3O4-NPs/orange-peel composite exhibits excellent Fenton-like catalytic performance which offers great prospects for low-cost and high-efficiency organic dye wastewater treatment.

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