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.

Lignosulfonate-Assisted Hydrothermal Synthesis of Mesoporous MnFe2O4 and Fe3O4 for Pb(II) Removal

NANO ◽  
2018 ◽  
Vol 13 (03) ◽  
pp. 1850024 ◽  
Author(s):  
Yuan Ma ◽  
Shengtao Xing ◽  
Yinsu Wu ◽  
Yuanzhe Gao ◽  
Zichuan Ma
Keyword(s):  
Adsorption Capacity ◽  
Mesoporous Structure ◽  
Hydroxyl Groups ◽  
Magnetic Adsorbent ◽  
High Adsorption ◽  
Narrow Pore Size Distribution ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Magnetic Adsorbents ◽  
Structure Surface

The development of efficient magnetic adsorbents is highly desirable for water treatment. In this work, MnFe2O4 and Fe3O4 were prepared by a lignosulfonate-assisted hydrothermal method. The structure, surface property and adsorption capacity of the products were investigated. The obtained products have a small amount of carbonaceous materials, mesoporous structure and narrow pore size distribution. In comparison with the samples prepared without lignosulfonate, they have more surface hydroxyl groups and highly negatively charged surface in aqueous solution, which favor the adsorption of cations. Fe3O4 and especially MnFe2O4 exhibited high adsorption capacity towards Pb(II). The maximal removal efficiency of Pb(II) (50[Formula: see text]mg[Formula: see text]L[Formula: see text]) on MnFe2O4 was 100% at pH 6.2. The results demonstrate that this method is promising for the synthesis of magnetic adsorbent.

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.

Adsorption Capacity of Y Zeolite Using Organic Solvents such as Adsorbates

2014 ◽  
Vol 805 ◽  
pp. 641-645
Author(s):  
Ana Paula Araújo ◽  
Aline Cadigena Lima Patrício ◽  
Anna Karoline Freires de Sousa ◽  
Mariaugusta Ferreira Mota ◽  
Meiry Glaúcia Freire Rodrigues
Keyword(s):  
Small Molecules ◽  
Adsorption Capacity ◽  
Selective Adsorption ◽  
X Ray Diffraction ◽  
Y Zeolite ◽  
High Adsorption ◽  
X Ray ◽  
Low Concentrations ◽  
Adsorption Of Nitrogen ◽  
Type Zeolite

The zeolites differ from traditional adsorbents for selective adsorption of small molecules, the high adsorption capacity at low concentrations and affinity for organic compounds and unsaturated polar molecules. In this work a Y-type zeolite was synthesized, characterized by x-ray diffraction, scanning electron microscopy and adsorption of nitrogen and subjected to test adsorption capacity where it was found that the Y zeolite has the potential adsorption capacity compared to other materials being studied and marketed.

Controllable synthesis of phosphate-modified BiPO4 nanorods with high photocatalytic activity: surface hydroxyl groups concentrations effects

RSC Advances ◽  
2015 ◽  
Vol 5 (121) ◽  
pp. 99712-99721 ◽  
Author(s):  
Yan Li ◽  
Yawen Wang ◽  
Yu Huang ◽  
Junji Cao ◽  
Wingkei Ho ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Surface Modification ◽  
Photocatalytic Performance ◽  
High Photocatalytic Activity ◽  
Hydroxyl Groups ◽  
Controllable Synthesis ◽  
Surface Hydroxyl ◽  
Methylene Orange ◽  
Surface Hydroxyl Groups

Surface modification by phosphate efficiently improves the photocatalytic performance of BiPO4 for the degradation of methylene orange (MO), by enhancing the concentration of surface hydroxyl groups and improving its hydrophilicity.

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