Silica microspheres containing high density surface hydroxyl groups as efficient epoxidation catalysts

RSC Advances ◽  
2015 ◽  
Vol 5 (27) ◽  
pp. 21125-21131 ◽  
Author(s):  
Prakash Chandra ◽  
Dhananjay S. Doke ◽  
Shubhangi B. Umbarkar ◽  
Kumar Vanka ◽  
Ankush V. Biradar
Keyword(s):  
Hydrogen Peroxide ◽  
High Density ◽  
Hydroxyl Groups ◽  
Silica Microspheres ◽  
Surface Hydroxyl ◽  
Condensation Method ◽  
Surface Hydroxyl Groups ◽  
Density Surface

Uniformly sized silica microspheres were synthesized by a hydrolysis–condensation method and very efficient for epoxidation of olefine using hydrogen peroxide as green oxidant.

Colorimetric H2O2 Detection Using Ag-Nanoparticle-Decorated Silica Microspheres

NANO ◽  
2020 ◽  
Vol 15 (01) ◽  
pp. 2050009 ◽  
Author(s):  
Zhikun Zhang ◽  
Qingqing Liu ◽  
Yumin Liu ◽  
Ran Qi ◽  
Lilong Zhou ◽  
...  
Keyword(s):  
Color Change ◽  
Colorimetric Detection ◽  
Hydroxyl Groups ◽  
Ag Nanoparticle ◽  
Silica Microspheres ◽  
Ag Nps ◽  
Practical Applications ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
H2o2 Detection

In view of the importance of convenient and rapid H2O2 detection for biological analysis, we herein propose Ag nanoparticle (NP)-decorated silica microspheres as a probe for instant and non-enzymatic on-site colorimetric detection of H2O2. The surface hydroxyl groups of silica microspheres were reacted with (3-mercaptopropyl)trimethoxysilane to afford thiolated microspheres that subsequently bind Ag NPs. The oxidation of residual –SH groups on the silica surface to –S–S– moieties in the presence of H2O2 induces the aggregation of decorated microspheres and is accompanied by a color change. Sensor response is found to be proportional to H2O2 concentration in the range from 100[Formula: see text]nM to 1[Formula: see text]mM, with UV–Vis and colorimetric detection limits determined as 10[Formula: see text][Formula: see text]M and 10[Formula: see text][Formula: see text]M, respectively. The developed platform is successfully used to detect H2O2 in simulated human urine and is, therefore, concluded to be sufficiently stable and selective for practical applications.

The synthesis of bayberry-like mesoporous TiO2 microspheres by a kinetics-controlled method and their hydrophilic films

CrystEngComm ◽  
2020 ◽  
Vol 22 (5) ◽  
pp. 969-978 ◽  
Author(s):  
Li Li ◽  
Liang Wang ◽  
Xinhong Chen ◽  
Changyuan Tao ◽  
Jun Du ◽  
...  
Keyword(s):  
Surface Roughness ◽  
High Surface ◽  
Mesoporous Tio2 ◽  
High Density ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
High Surface Roughness ◽  
Surface Hydroxyl Groups ◽  
Tio2 Microspheres

Bayberry-like mesoporous TiO2 hydrophilic films with high surface roughness and high density of surface hydroxyl groups.

Enhanced surface hydroxyl groups by using hydrogen peroxide on hollow tubular alumina for removing fluoride

2020 ◽  
Vol 297 ◽  
pp. 110051 ◽  
Author(s):  
Lei Huang ◽  
Zhihui Yang ◽  
Zhuanxia Zhang ◽  
Linfeng Jin ◽  
Weichun Yang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Enhanced Surface ◽  
Tubular Alumina

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.

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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