Immobilization of Lipase on KH560 Modified Silica by Sol-Gel Process

2016 ◽  
Vol 31 (3) ◽  
pp. 311 ◽  
Author(s):  
SONG Cong ◽  
YU Xiao-Wei ◽  
QIAN Dan ◽  
SUN Zhen-Zhong ◽  
JIANG Bo
Keyword(s):  
Sol Gel ◽  
Modified Silica ◽  
Sol Gel Process

scholarly journals PENGARUH RUTE SINTESIS TERHADAP KEEFEKTIFAN PENGIKATAN GUGUS PDETA PADA SINTESIS Fe3O4@SiO2@PDETA

2019 ◽  
Vol 8 (1) ◽  
pp. 39 ◽  
Author(s):  
Susanto Susanto ◽  
Ricka Prasdiantika
Keyword(s):  
Raw Materials ◽  
Sol Gel ◽  
Trisodium Citrate ◽  
Modified Silica ◽  
X Ray ◽  
Dispersion Agent ◽  
Sol Gel Process ◽  
Synthesis Routes ◽  
Mixing Sequences ◽  
Scanning Electron

Synthesis of Fe3O4@SiO2 modified with propyldiethylenetriamine (Fe3O4@SiO2@PDETA) with variation of synthesis routes have been investigated. Research was begun with synthesis of Fe3O4 using dispersion agent of trisodium citrate at coprecipitation system through stirring using ultrasonic wave. Coating magnetite with propyldiethylenetriamine modified silica was carried out through sol-gel process with two different mixing sequences of raw materials (two synthesis routes) with main materials of Fe3O4 synthesized, N-[3-(Trimethoxysilyl)propyl]-diethylenetriamine (TMSPDETA) and Na2SiO3. The products were characterized by fourier transform infrared (FTIR) spectrophotometer and scanning electron microscope-energy dispersive X-ray (SEM-EDX). Results indicate that Fe3O4@SiO2@PDETA has been synthesized succesfully. Fe3O4@SiO2@PDETA synthesized through route 1 (magnetite mixed with a mixture TMSPDETA and Na2SiO3) contains more propyldiethylenetriamine group than that of through route 2 (magnetite mixed with Na2SiO3 solution, then mixed with TMSPDETA)

Study on Preparation and Hydrophobicity of MTES Derived Silica Sol and Gel

2012 ◽  
Vol 535-537 ◽  
pp. 2563-2566 ◽  
Author(s):  
Yu Ma ◽  
Hye Ryeon Lee ◽  
Toshinori Tsuru
Keyword(s):  
Reaction Rate ◽  
Sol Gel ◽  
Phase Segregation ◽  
Silica Sol ◽  
Molar Ratio ◽  
Modified Silica ◽  
Sol Gel Process ◽  
One Step ◽  
Inorganic Precursors

The synthesis of hydrophobic sol by one-step sol-gel process ammonia catalyzed was investigated. The water molar ratio and catalyst molar ratio were discussed to prevent phase segregation during the hydrolysis and co-condensation of the organic and inorganic precursors. The reactant system with water molar ratio 70 could make the reaction rate of MTES slightly less than that of TEOS, so that the hydrolysis - condensation – gelling reaction with MTES and TEOS as co-precursors could be synchronously. With the increase of the MTES/TEOS molar ratio, the reaction rate of the silica sol preparation decreased, the hydrophobicity of the sol and gel increased as the molar ratio MTES/TEOS change from 0.5~4. But the hydrophobicity of the methyl-modified silica sol and gel prepared with pure MTES in the sol-gel process were slightly lower than that of the methyl-modified silica sol and gel prepared with MTES and TEOS as co-precursors.

Pd Nanoparticles Fabricated on Organic-Group Modified Silica and its Catalytic Performance for Acetylene Hydrogenation

2011 ◽  
Vol 233-235 ◽  
pp. 1884-1888
Author(s):  
Kang Jun Wang ◽  
Jing Wu ◽  
Ping Yu
Keyword(s):  
Sol Gel ◽  
Co Adsorption ◽  
Pd Nanoparticles ◽  
Catalytic Performance ◽  
Pd Catalyst ◽  
Modified Silica ◽  
In Situ Drifts ◽  
Organic Group ◽  
Sol Gel Process

Aminopropyl-functionalized silica (NH2-SiO2) was obtained via a sol-gel process using tetraethoxylsilicate (TEOS) and aminopropyltriethoxysilane (APTES). Aminopropyl group contained silica was further modified with formaldehyde to achieve a novel organic group modified silica, denoted as CH2O-SiO2. Using CH2O-SiO2 as support to prepare surported Pd catalyst (denoted as Pd/M-SiO2), small Pd nanoparticles (1-2 nm) were fabricated on CH2O-SiO2 surport. Hydrogenation of acetylene is used as probe reaction to evaluate the catalytic performance of Pd/M-SiO2. The results indicate that Pd/M-SiO2 exhibits unique catalytic property, which the selectivity of ethylene increases with the increase of acetylene conversion. In-situ DRIFTS spectra of CO adsorption show that the organic groups presented on the silica affect the electronic property of the very small Pd nanoparticles, which causes the change of reaction paths of hydrogenation of acetylene over Pd/M-SiO2 compared with traditional supported Pd catalyst.

Properties and Preparation of Chitosan/Silanol Quaternary Ammonium Modified Silica Hybrids Using Sol–Gel Process

2011 ◽  
Vol 50 (7) ◽  
pp. 1430-1446 ◽  
Author(s):  
S.-M. Lai ◽  
W.-C. Chen ◽  
Tai-Wei Wu ◽  
Arthur J.-M. Yang ◽  
C.-H. Yang
Keyword(s):  
Quaternary Ammonium ◽  
Sol Gel ◽  
Modified Silica ◽  
Sol Gel Process ◽  
Silica Hybrids

scholarly journals L-Arginine-Modified Silica for Adsorption of Gold(III)

2015 ◽  
Vol 15 (2) ◽  
pp. 108-115 ◽  
Author(s):  
Sri Hastuti ◽  
Nuryono Nuryono ◽  
Agus Kuncaka
Keyword(s):  
Sol Gel ◽  
Tetraethyl Orthosilicate ◽  
Modified Silica ◽  
Experimental Conditions ◽  
Silica Source ◽  
Batch System ◽  
Sol Gel Process ◽  
Pseudo Second Order ◽  
Prospective Application ◽  
Gel Preparation

In this research, L-arginine-modified silica (SiO2-Arg) with 3-glycidoxypropyl-trimethoxysilane (GPTMS) as the linking agent has been synthesized through sol gel process for adsorption of Au(III) in aqueous solution. Tetraethyl orthosilicate (TEOS) as the silica source precursor, L-arginine solution 0.9 M with various volume ratios and the linking agent were mixed together to form a gel. SiO2-Arg was characterized using Fourier transform infrared (FTIR) spectrophotometer, thermogravimetric analysis (TGA), and an elemental analysis. Adsorption was carried out in a batch system under various experimental conditions including contact time and initial concentration of metal Au(III). The selectivity of adsorbent toward Au(III) was examined in the presence of Cu(II), Fe(III), and Zn(II) ion at various pHs. Results of characterization showed that silica has been successfully modified with L-arginine. The optimum adsorption of Au(III) on SiO2-Arg was obtained at pH of 3.0 and the adsorption isotherm of Au(III) on SiO2-Arg gives the adsorption capacity of 52.79 mg/g. The kinetic study demonstrates that the adsorption of Au(III) ion follows pseudo-second order with the rate constant of 53197 g mol–1 min–1. The selectivity order of Au-Zn = Au-Cu > Au-Fe. This sol-gel preparation is simple and provides prospective application of SiO2-Arg material as an effective adsorbent for metal ions particularly gold(III).

scholarly journals Fluorescence and Infrared Spectra of Phenyl-modified Silica Gels Prepared by the Sol-Gel Process.

1998 ◽  
pp. 489-494 ◽  
Author(s):  
Kazunori MATSUI ◽  
Takamasa YAMAMOTO ◽  
Tetsuji GOTO ◽  
Kazuhiro NOZAWA ◽  
Kentaro BESSHO
Keyword(s):  
Infrared Spectra ◽  
Sol Gel ◽  
Silica Gels ◽  
Modified Silica ◽  
Sol Gel Process ◽  
Modified Silica Gels
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