Ozonation catalyzed by iron silicate for the degradation of o-chloronitrobenzene in drinking water

2012 ◽  
Vol 12 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Y. Liu ◽  
Z. Chen ◽  
L. Yang ◽  
Y. Han ◽  
J. Shen ◽  
...  
Keyword(s):  
Active Species ◽  
Catalytic Ozonation ◽  
Iron Silicate ◽  
Radical Scavenger ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Hydroxyl Radical Scavenger ◽  
Silicate Surface ◽  
Ozonation Process ◽  
Hydroxylated Surface

This paper aimed to reveal the effectiveness and the mechanism of catalytic ozonation in the presence of iron silicate for the degradation of o-chloronitrobenzene (oCNB). Experimental results show that catalytic ozonation in the presence of iron silicate could substantially enhance oCNB removal efficiency compared with ozonation alone, and that the adsorption of oCNB on the iron silicate surface had no significant effect on the degradation of oCNB. The results of a hydroxyl radical scavenger experiment using spin-trapping/EPR technology to identify hydroxyl radicals (•OH) confirm that •OH were the main active species in the removal of oCNB during the ozonation process catalyzed by iron silicate. The catalytic activity of the iron silicate was related to a highly hydroxylated surface. It was confirmed that the surface hydroxyl groups on the iron silicate were the reaction sites between ozone and oCNB.

Degradation of p-Chloronitrobenzene in Aqueous Solution by Iron Silicate Catalytic Ozonation

2014 ◽  
Vol 955-959 ◽  
pp. 2162-2168 ◽  
Author(s):  
Yue Liu ◽  
Lei Liu ◽  
Wei Jin Gong
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Catalytic Ozonation ◽  
Iron Silicate ◽  
Radical Scavenger ◽  
Efficient Catalyst ◽  
Green Catalyst ◽  
Hydroxyl Radical Scavenger ◽  
Radical Type ◽  
Ozonation Process

Iron silicate, a stable and efficient catalyst prepared in the laboratory has been successfully used as a catalyst combined with ozonation in the degradation of p-Chloronitrobenzene (pCNB). The catalytic ozonation removal effectiveness of pCNB was investigated under various physicochemical conditions. Both the adsorption and the single ozonation were not effective for the degradation of pCNB, but the presence of iron silicate in ozonation process could substantially enhance the pCNB removal efficiency. The hydroxyl radical scavenger experiment confirmed that iron silicate catalytic ozonation followed a radical-type mechanism. The increasing of both the iron silicate dosage and the ozone dosage could enhance the removal effectiveness of pCNB. The iron silicate catalyst could be recycled easily without decreasing any ozone catalytic activity after four successive reuses. It is concluded that the iron silicate was an efficient green catalyst for pCNB degradation in drinking water.

Manganese Silicate Catalyzed Ozonation of m-Chloronitrobenzene in Drinking Water

2011 ◽  
Vol 239-242 ◽  
pp. 1159-1164
Author(s):  
Yue Liu ◽  
Zhong Lin Chen ◽  
Yu Liu ◽  
Ying Han ◽  
He Wang ◽  
...  
Keyword(s):  
Drinking Water ◽  
Catalytic Activity ◽  
Catalytic Ozonation ◽  
Radical Scavenger ◽  
Efficient Catalyst ◽  
Green Catalyst ◽  
Manganese Silicate ◽  
Hydroxyl Radical Scavenger ◽  
Radical Type ◽  
Ozonation Process

Manganese silicate, a stable and efficient catalyst prepared in the laboratory has been successfully used as a catalyst combined with ozonation in the degradation of m-Chloronitrobenzene (mCNB). The catalytic ozonation removal effectiveness of mCNB was investigated under various physicochemical conditions. Both the adsorption and the single ozonation were not effective for the degradation of mCNB, but the presence of manganese silicate in ozonation process could substantially enhance the mCNB removal efficiency. The hydroxyl radical scavenger experiment confirmed that manganese silicate catalytic ozonation followed a radical - type mechanism. The increasing of the manganese silicate dosage could enhance the removal effectiveness of mCNB. The manganese silicate catalyst could be recycled easily without decreasing any ozone catalytic activity after four successive reuses. It is concluded that the manganese silicate was an efficient green catalyst for mCNB degradation in drinking water.

The efficiency and mechanism of γ-alumina catalytic ozonation of 2-methylisoborneol in drinking water

2006 ◽  
Vol 6 (3) ◽  
pp. 43-51 ◽  
Author(s):  
L. Chen ◽  
F. Qi ◽  
B. Xu ◽  
Z. Xu ◽  
J. Shen ◽  
...  
Keyword(s):  
Drinking Water ◽  
Ph Value ◽  
Relative Concentration ◽  
Catalytic Ozonation ◽  
Hydroxyl Group ◽  
Ozone Decomposition ◽  
Group Status ◽  
Remarkable Effect ◽  
Surface Hydroxyl ◽  
Ozonation Process

The efficiency and mechanism in degradation of 2-methylisoborneol (MIB) as a taste and odour compound in drinking water were studied under the condition where γ-alumina catalysed ozonation. As a result, γ-alumina can show distinct activity in enhancing the efficiency of ozonation of MIB. Tert-butyl alcohol had a remarkable effect on the removal efficiency of catalytic ozonation of MIB. The surface charge status, surface hydroxyl group status of γ-alumina, and pH values of the solution can be linked together. When the pH value of the solution was near the pHzpc of γ-Al2O3, there was observable activity in the catalysed ozonation process. Rct, which denoted the relative concentration of hydroxyl radical (·OH), was much higher in the catalysed ozonation process than in the ozonation process. This result further illuminated that γ-Al2O3 can promote ozone decomposition to produce ·OH. Finally, the effect of rP/I on catalysed ozone decomposition and ozone decomposition was investigated.

scholarly journals Preparation of MgO nanocrystals and catalytic mechanism on phenol ozonation

RSC Advances ◽  
2017 ◽  
Vol 7 (69) ◽  
pp. 43464-43473 ◽  
Author(s):  
Bing Wang ◽  
Xingaoyuan Xiong ◽  
Hongyang Ren ◽  
ZhiYu Huang
Keyword(s):  
Activation Energy ◽  
Magnesium Oxide ◽  
Catalytic Mechanism ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Ozonation Process

The prepared magnesium oxide catalyzes the ozonation process using its surface hydroxyl groups alone, and does not involve a change of activation energy.

The Function of Surface Hydroxyl Groups of Incorporated Alumina on Catalytic Ozonation of Heavy Oil Produced Water

2019 ◽  
Vol 41 (6) ◽  
pp. 521-530 ◽  
Author(s):  
Qiushi Zhu ◽  
Wei Yao ◽  
Haibo Ye ◽  
Shuofan Li ◽  
Mengmeng Si ◽  
...  
Keyword(s):  
Heavy Oil ◽  
Produced Water ◽  
Catalytic Ozonation ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups

Influence of the surface hydroxyl groups of MnOx/SBA-15 on heterogeneous catalytic ozonation of oxalic acid

2014 ◽  
Vol 242 ◽  
pp. 348-356 ◽  
Author(s):  
Qiangqiang Sun ◽  
Laisheng Li ◽  
Huihua Yan ◽  
Xiaoting Hong ◽  
K.S. Hui ◽  
...  
Keyword(s):  
Oxalic Acid ◽  
Catalytic Ozonation ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Heterogeneous Catalytic ◽  
Surface Hydroxyl Groups

scholarly journals Catalytic ozonation for the removal of reactive black 5 (RB-5) dye using zeolites modified with CuMn2O4/gC3N4 in a synergic electro flocculation-catalytic ozonation process

2021 ◽  
Author(s):  
Amir Ikhlaq ◽  
Mahrukh Zafar ◽  
Farhan Javed ◽  
Abdullah Yasar ◽  
Asia Akram ◽  
...  
Keyword(s):  
Treatment Option ◽  
Treatment Options ◽  
Catalytic Ozonation ◽  
Zeolite Catalysts ◽  
Radical Mechanism ◽  
Radical Scavenger ◽  
Reactive Black 5 ◽  
Zeolite 4A ◽  
First Time ◽  
Ozonation Process

Abstract This study aims to investigate the decolourization efficiency of reactive black 5 (RB-5) dye by using CuMn2O4/gC3N4 coated zeolites (zeolite 4A) for the first time in a hybrid electro-flocculation-catalytic ozonation process. A comparison between various treatment options such as electro-flocculation, electro-flocculation in the presence of a catalyst, and catalytic ozonation in combination with electro-flocculation was explored. Moreover, the effect of different factors such as pH, time, catalyst dose, ozone dose, radical scavenger, and voltage has been studied in each treatment option mentioned earlier. The results indicated that the best treatment option was found to be catalytic ozonation in combination with electro-flocculation with removal efficiency (RE) of 90.31% at pH 10 after 30 min of the treatment process. The hydroxyl radical scavenger effect indicated that the synergistic catalytic process follows a radical mechanism. It is therefore concluded that CuMn2O4/gC3N4–zeolite catalysts in synergic electro-flocculation-catalytic ozonation process may be effectively used for the treatment of textile wastewaters.

Influence of Volcanic Sand Surface Hydroxyl Groups on the Heterogeneous Catalytic Ozonation of Methylene Blue Contaminated Waters

2012 ◽  
Vol 15 (2) ◽  
Author(s):  
Héctor Valdés ◽  
Héctor P. Godoy ◽  
Claudio A. Zaror
Keyword(s):  
Methylene Blue ◽  
Catalytic Ozonation ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Heterogeneous Catalytic ◽  
Sand Surface ◽  
Surface Hydroxyl Groups ◽  
Contaminated Waters

AbstractIn this work, the influence of volcanic sand surface hydroxyl groups (Me-OH

scholarly journals The Selectivity of Different Sized Catalysts on DOM Fractional Removal during the Catalytic Ozonation of Municipal Sewage

Catalysts ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 14
Author(s):  
Cheng Wang ◽  
Ji Wu ◽  
Aimin Li ◽  
Chendong Shuang
Keyword(s):  
Particle Size ◽  
Catalyst Particle ◽  
Catalytic Ozonation ◽  
Municipal Sewage ◽  
Hydroxyl Groups ◽  
Particle Sizes ◽  
Surface Hydroxyl ◽  
Molecular Weights ◽  
Catalyst Particle Size ◽  
Advanced Treatments

Dissolved organic matter (DOM) is a typical kind of pollutant with a complex composition, and different advanced treatments demonstrate different abilities toward its fractional removal. Hence, it is necessary to analyze the fraction of DOM that remains when using advanced treatments. In this paper, ozonation was used to deal with the biological effluents and comparisons of the catalytic ozonation with different particle sizes of γ-Al2O3 were made. The results of these comparisons indicated that the catalysts were active in improving the removal of DOM and γ-Al2O3 with different particle sizes can selectively remove DOM. The result of fluorescence showed that a decrease in the catalyst particle size contributes to a significant decrease in the fluorescence intensity, except for tryptophan-like substances. Meanwhile, DOM fractions with large molecular weights could be decomposed into small molecules by ozonation, resulting in increased hydrophilicity. However, the use of a catalyst in ozonation increased the removal of hydrophilic components. Additionally, a smaller catalyst particle size increased the removal of hydrophilic components. The results of catalyst analysis implied that the surface hydroxyl groups of catalyst γ-Al2O3 and the diffusion of DOM in the catalyst γ-Al2O3 played important roles in the ozonation catalytic process for the removal of DOM.

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