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.

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.

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.

Mechanism investigation of catalyzed ozonation of 2-methylisoborneol in drinking water over aluminum (hydroxyl) oxides: Role of surface hydroxyl group

2010 ◽  
Vol 165 (2) ◽  
pp. 490-499 ◽  
Author(s):  
Fei Qi ◽  
Bingbing Xu ◽  
Zhonglin Chen ◽  
Liqiu Zhang ◽  
Panyue Zhang ◽  
...  
Keyword(s):  
Drinking Water ◽  
Hydroxyl Group ◽  
Surface Hydroxyl

scholarly journals Taguchi Optimization of Catalytic Ozonation Process Using Modified Bone Char Ash for Removal of Methylene Blue from Aqueous Solution

2020 ◽  
Vol 7 (2) ◽  
pp. 66-71
Author(s):  
Ghorban Asgari ◽  
Somaye Akbari
Keyword(s):  
Methylene Blue ◽  
Reaction Time ◽  
Textile Industry ◽  
Ph Value ◽  
Catalytic Ozonation ◽  
Bone Char ◽  
Operational Parameters ◽  
Taguchi Optimization ◽  
Initial Ph ◽  
Ozonation Process

Methylene blue (MB) dye is an environmental contaminant that has been mostly used in textile industry. Taguchi orthogonal array design was employed as an optimization method to reduce the number of experiments. In this research, bone char ash modified by MgO-Fe catalyst was applied for degradation of MB in catalytic ozonation process (COP) system and operational parameters including initial MB dosages, initial pH, catalyst dose, and contact time were optimized with Taguchi method. Accordingly, the best condition for the removal of MB obtained at initial MB concentration of 20 mg/L, reaction time of 15 minutes, initial pH value of 10, and catalyst concentration of 0.1 g/L. Additionally, optimization of experimental set-up showed that the MB concentration had a notable effect on MB degradation in COP process (55.6%), and reaction time had a negligible effect (1.98%). At this condition, total organic carbon (TOC) removal was determined to be 31% but in longer time, its removal increased to 65%.

Catalytic ozonation of p-chloronitrobenzene over pumice-supported zinc oxyhydroxide

2013 ◽  
Vol 68 (8) ◽  
pp. 1895-1900 ◽  
Author(s):  
Lei Yuan ◽  
Jimin Shen ◽  
Zhonglin Chen
Keyword(s):  
Hydroxyl Radicals ◽  
Underlying Mechanism ◽  
Catalytic Ozonation ◽  
Point Of Zero Charge ◽  
Hydroxyl Groups ◽  
Ozone Decomposition ◽  
Surface Hydroxyl ◽  
Heterogeneous Catalytic ◽  
Surface Hydroxyl Groups ◽  
Catalytic Ozone

The catalytic ozonation of p-chloronitrobenzene (pCNB) in an aqueous solution using pumice-supported zinc oxyhydroxide (ZMP) as the catalyst was investigated. ZMP significantly enhanced the degradation efficiency in the heterogeneous catalytic ozonation compared with ozonation alone. The decomposition rate of the aqueous ozone increased 2.84-fold in the presence of ZMP. Catalytic ozone decomposition showed that pCNB is oxidized primarily by hydroxyl radicals (•OH) in ozonation/ZMP processes. This modification increases the density of surface hydroxyl groups as well as the pH at the point of zero charge (pHPZC) of pumice, resulting in the appearance of new ZnO and Zn(OH)2 crystalline phases. An investigation of the underlying mechanism confirms that ZnOOH loading promotes •OH initiation, which enhances the degradation of pCNB.

scholarly journals The Role of Catalytic Ozonation Processes on the Elimination of DBPs and Their Precursors in Drinking Water Treatment

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 521
Author(s):  
Fernando J. Beltrán ◽  
Ana Rey ◽  
Olga Gimeno
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Humic Substances ◽  
Hypochlorous Acid ◽  
Drinking Water Treatment ◽  
Disinfection Byproducts ◽  
Catalytic Ozonation ◽  
Operating Conditions ◽  
Halogen Compounds ◽  
Radiation Sources

Formation of disinfection byproducts (DBPs) in drinking water treatment (DWT) as a result of pathogen removal has always been an issue of special attention in the preparation of safe water. DBPs are formed by the action of oxidant-disinfectant chemicals, mainly chlorine derivatives (chlorine, hypochlorous acid, chloramines, etc.), that react with natural organic matter (NOM), mainly humic substances. DBPs are usually refractory to oxidation, mainly due to the presence of halogen compounds so that advanced oxidation processes (AOPs) are a recommended option to deal with their removal. In this work, the application of catalytic ozonation processes (with and without the simultaneous presence of radiation), moderately recent AOPs, for the removal of humic substances (NOM), also called DBPs precursors, and DBPs themselves is reviewed. First, a short history about the use of disinfectants in DWT, DBPs formation discovery and alternative oxidants used is presented. Then, sections are dedicated to conventional AOPs applied to remove DBPs and their precursors to finalize with the description of principal research achievements found in the literature about application of catalytic ozonation processes. In this sense, aspects such as operating conditions, reactors used, radiation sources applied in their case, kinetics and mechanisms are reviewed.

Full-Scale Application of Catalytic Ozonation for Drinking Water Treatment: Case Study in China

2014 ◽  
Vol 140 (9) ◽  
Author(s):  
Zheng-Qian Liu ◽  
Bang-Jun Han ◽  
Gang Wen ◽  
Jun Ma ◽  
Sheng-Jun Wang ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Drinking Water Treatment ◽  
Catalytic Ozonation ◽  
Full Scale

scholarly journals Effects of ferric ions on the catalytic ozonation process on sanitary landfill leachates

2013 ◽  
Vol 8 (1) ◽  
Author(s):  
Andre Luiz de Souza ◽  
Helcio Jose Izario Filho ◽  
Andre Luiz de Castro Peixoto ◽  
Oswaldo Luiz Cobra Guimaraes ◽  
Carla Cristina Almeida Loures ◽  
...  
Keyword(s):  
Catalytic Ozonation ◽  
Sanitary Landfill ◽  
Ferric Ions ◽  
Landfill Leachates ◽  
Ozonation Process
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