The role of surface hydroxyl concentration on calcinated alumina in catalytic ozonation

The potassium promoter would tailor the microstructure of the Zn–Cr spinel and stabilize the surface hydroxyl species which greatly facilitate the formate of isobutanol.

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

Water Science & Technology Water Supply ◽

10.2166/ws.2006.726 ◽

2006 ◽

Vol 6 (3) ◽

pp. 43-51 ◽

Cited By ~ 2

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.

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Bidimensional Solvation and Delocalisation of Electrons at the Surface of an Insulating Oxide: The Role of Surface Hydroxyl Groups on MgO

ChemPhysChem ◽

10.1002/cphc.200400466 ◽

2004 ◽

Vol 5 (12) ◽

pp. 1897-1900 ◽

Cited By ~ 9

Author(s):

Mario Chiesa ◽

Maria Cristina Paganini ◽

Elio Giamello

Keyword(s):

Hydroxyl Groups ◽

Surface Hydroxyl ◽

Surface Hydroxyl Groups

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

Water Science & Technology Water Supply ◽

10.2166/ws.2011.096 ◽

2012 ◽

Vol 12 (1) ◽

pp. 31-37 ◽

Cited By ~ 2

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.

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