Sulfur dioxide adsorption and photooxidation on isotopically-labeled titanium dioxide nanoparticle surfaces: roles of surface hydroxyl groups and adsorbed water in the formation and stability of adsorbed sulfite and sulfate

2012 ◽  
Vol 14 (19) ◽  
pp. 6957 ◽  
Author(s):  
Charith E. Nanayakkara ◽  
John Pettibone ◽  
Vicki H. Grassian
Keyword(s):  
Titanium Dioxide ◽  
Sulfur Dioxide ◽  
Adsorbed Water ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Titanium Dioxide Nanoparticle ◽  
Surface Hydroxyl Groups

Relationship between surface hydroxyl groups and liquid-phase photocatalytic activity of titanium dioxide

2015 ◽  
Vol 444 ◽  
pp. 42-48 ◽  
Author(s):  
Wenjuan Li ◽  
Dandan Du ◽  
Tingjiang Yan ◽  
Desheng Kong ◽  
Jinmao You ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Liquid Phase ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups

scholarly journals Study of sulfur dioxide adsorption on Y zeolite

2004 ◽  
Vol 69 (7) ◽  
pp. 563-569 ◽  
Author(s):  
Ioan-Cezar Marcu ◽  
I. Sdjndulescu
Keyword(s):  
Sulfur Dioxide ◽  
Lewis Acidity ◽  
Hydroxyl Groups ◽  
Y Zeolite ◽  
High Adsorption ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Type Zeolite ◽  
Adsorption Desorption ◽  
Adsorptive Properties

Sulfur dioxide adsorptive properties of Y zeolite, the structure of which was confirmed by XRD, were investigated at temperatures within the 25?200 ?C range and sulfur dioxide concentrations between 0.9 to 6%(vol./vol). It was found that this sorbent possesses a relatively high adsorption capacity. The Y zeolite did not lose its activity during 20 adsorption desorption-regeneration cycles. The manner in which sulfur dioxide is adsorbed on Y type zeolite was also investigated by analyzing the sample with and without adsorbed SO2, using IR spectroscopy, as well as total and Lewis acidity measurements. The sulfur dioxide molecule is probably adsorbed by hydrogen bonding to one or two conveniently positioned surface hydroxyl groups.

The synthesis and structure of silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complexes

1986 ◽  
Vol 51 (7) ◽  
pp. 1430-1438 ◽  
Author(s):  
Alena Reissová ◽  
Zdeněk Bastl ◽  
Martin Čapka
Keyword(s):  
Free Surface ◽  
Hydroxyl Groups ◽  
Titanium Complex ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Free Hydroxyl ◽  
Cyclopentadienyl Anion

The title complexes have been obtained by functionalization of silica with cyclopentadienylsilanes of the type Rx(CH3)3 - xSi(CH2)nC5H5 (x = 1-3, n = 0, 1, 3), trimethylsilylation of free surface hydroxyl groups, transformation of the bonded cyclopentadienyl group to the cyclopentadienyl anion, followed by coordination of (h5-cyclopentadienyl)trichlorotitanium. The effects of single steps of the above immobilization on texture of the support, the number of free hydroxyl groups, the coverage of the surface by cyclopentadienyl groups and the degree of their utilization in anchoring the titanium complex have been investigated. ESCA study has shown that the above anchoring leads to formation of the silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complex.

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