A silica aerogel as an extractive coating for in-tube solid-phase microextraction to determine polycyclic aromatic hydrocarbons in water samples

2019 ◽  
Vol 11 (45) ◽  
pp. 5784-5792 ◽  
Author(s):  
Xiangping Ji ◽  
Juanjuan Feng ◽  
Chunying Li ◽  
Sen Han ◽  
Jiaqing Feng ◽  
...  
Keyword(s):  
Silica Aerogel ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Ambient Pressure ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Ambient Pressure Drying ◽  
Acid Base ◽  
Polycyclic Aromatic

A silica aerogel with high surface area was prepared by an acid–base two-step catalytic sol–gel method under ambient pressure drying.

Preparation of monolithic titania aerogels with high surface area by a sol–gel process combined surface modification

RSC Advances ◽  
2014 ◽  
Vol 4 (62) ◽  
pp. 32934-32940 ◽  
Author(s):  
Hui Yang ◽  
Wenjun Zhu ◽  
Sai Sun ◽  
Xingzhong Guo
Keyword(s):  
Surface Modification ◽  
Surface Area ◽  
Ambient Pressure ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Ambient Pressure Drying ◽  
Sol Gel Process

Monolithic titania (TiO2) aerogels with high surface area were successfully synthesized by the sol–gel process combined surface modification, followed by ambient pressure drying.

Effects of Preparation Conditions on Characters of Hydrophobic Silica Granular Aerogel and its Applications

2012 ◽  
Vol 600 ◽  
pp. 190-193 ◽  
Author(s):  
Wei Wei ◽  
Jing Yi Zhang ◽  
Li Ping Wu ◽  
Guo Tong Qin
Keyword(s):  
Particle Size ◽  
Ambient Pressure ◽  
High Surface ◽  
Sol Gel ◽  
Average Particle Size ◽  
High Surface Area ◽  
Nitrogen Adsorption ◽  
Ambient Pressure Drying ◽  
Average Particle ◽  
Hydrophobic Silica

The hydrophobic silica granular aerogels were synthesized via sol-gel synthesis followed by ambient pressure drying. The tetraethyloxylane (TEOS) was used as original precursor. The aerogels were analyzed using nitrogen adsorption, scanning electron microscopy (SEM) and laser particle size analyzer. It was found that the aerogel was mesoporous material with high surface area. The aerogels were prepared in grain form by dipping into disperse solution in order to adsorption application. The average particle size of the aerogel was controlled by pH and disperse solution volume. The pH also affected gel time. The aerogels were used to absorb phenol from water. The saturated adsorption amount could reach up to 145 mg•g-1.

scholarly journals A Novel Environmental Route to Ambient Pressure Dried Thermal Insulating Silica Aerogel via Recycled Coal Gangue

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Pinghua Zhu ◽  
Meng Zheng ◽  
Shanyu Zhao ◽  
Junyong Wu ◽  
Haixun Xu
Keyword(s):  
Silica Aerogel ◽  
Ambient Pressure ◽  
High Surface ◽  
High Surface Area ◽  
Ambient Pressure Drying ◽  
Single Step ◽  
Coal Gangue ◽  
Potential Cost ◽  
Thermal Insulating ◽  
Porous Microstructure

Coal gangue, one of the main hazardous emissions of purifying coal from coalmine industry, is rich in silica and alumina. However, the recycling of the waste is normally restricted by less efficient techniques and low attractive output; the utilization of such waste is still staying lower than 15%. In this work, the silica aerogel materials were synthesized by using a precursor extracted from recycled silicon-rich coal gangue, followed by a single-step surface silylation and ambient pressure drying. A low density (~0.19 g/cm3) nanostructured aerogel with a 3D open porous microstructure and high surface area (~690 m2/g) was synthesized, which presents a superior thermal insulation performance (~26.5 mW·m−1·K−1of a plane packed of 4-5 mm granules which was confirmed by transient hot-wire method). This study offers a new facile route to the synthesis of insulating aerogel material by recycling solid waste coal gangue and presents a potential cost reduction of industrial production of silica aerogels.

Hydrophobic Silica Aerogels by Ambient Pressure Drying

2015 ◽  
Vol 830-831 ◽  
pp. 476-479
Author(s):  
Srinivasan Nagapriya ◽  
M.R. Ajith ◽  
H. Sreemoolanadhan ◽  
Mariamma Mathew ◽  
S.C. Sharma
Keyword(s):  
Surface Area ◽  
Atmospheric Pressure ◽  
Polar Solvent ◽  
Ambient Pressure ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Silica Aerogels ◽  
Ambient Pressure Drying ◽  
Sol Gel Process

Silica aerogels have been prepared through sol-gel process by polymerization of TEOS in the presence of NH4F and NH4OH as catalysts. The solvent present in the gel is replaced by ethanol followed by a non-polar solvent such as n-hexane prior to solvent modification step. Gels are made hydrophobic by treating them with HMDZ to prevent rupture during drying, which has been confirmed by FTIR. Gels are then washed and dried carefully in a PID controlled oven at atmospheric pressure. The ageing duration and solvent exchange combinations are optimized to yield crack-free gels prior to drying. Aerogels are characterized for density, specific surface area, pore volume, pore size, thermal stability and contact angle. Hydrophobic, high surface area (570 m2/g), low density (0.07 g/cm3) silica aerogels are synthesized by using optimized mole ratio of precursors and catalysts. Silica aerogel granules (1-3 mm) as well as monoliths (Ф~35 mm) could be produced through ambient pressure drying of gels.

Application of a High Surface Area Solid-Phase Microextraction Air Sampling Device: Collection and Analysis of Chemical Warfare Agent Surrogate and Degradation Compounds

2013 ◽  
Vol 85 (18) ◽  
pp. 8626-8633 ◽  
Author(s):  
Michael E. Stevens ◽  
Christopher A. Tipple ◽  
Philip A. Smith ◽  
David S. Cho ◽  
Robert V. Mustacich ◽  
...  
Keyword(s):  
Surface Area ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
High Surface ◽  
High Surface Area ◽  
Air Sampling ◽  
Chemical Warfare Agent ◽  
Chemical Warfare ◽  
Sampling Device

Synthesis and Characterization of Amine Impregnated Silica Aerogel from Rice Husk for CO2 Adsorption

2020 ◽  
Vol 13 ◽  
Author(s):  
A.R. Hidayu ◽  
N.F. Mohammad ◽  
S.I.S. Jamaludin ◽  
N.F.M.K. Teo ◽  
N.S.M. Sah ◽  
...  
Keyword(s):  
Rice Husk ◽  
Silica Aerogel ◽  
Co2 Adsorption ◽  
Sodium Hydroxide Solution ◽  
Ambient Pressure ◽  
Sol Gel ◽  
Ambient Pressure Drying ◽  
Modified Silica ◽  
Rice Husk Silica ◽  
Wide Range

Abstract: Rice husk has attracted considerable attention in the recent years due to its chemical component that are beneficial to a wide range of application. . In this paper, silica aerogel from rice husk ash (RHA) was prepared through sol-gel processing and ambient pressure drying. The silica RHA was extracted with sodium hydroxide solution to produce sodium silicate solution and neutralized with sulphuric acid to form silica gel. Then, the silica aerogel was further modified with amine, which is 3-(aminopropyl) triethoxysilane (APTES) because amine groups provide specific adsorption sides for CO2 adsorption. The functional group, surface morphology and elemental composition of rice husk, silica aerogel and modified silica aerogel were characterized by Fourier transform infrared spectroscopy (FTIR), Scanning Electronic Microscopy (SEM) and Elemental analyser (EA). For amine modified silica aerogel, it was found that the sample consists of N-H band at a certain peak. FTIR and SEM analysis revealed the synthesized silica aerogel has fibrous morphology and indicates similar trend with previous researches. The amine modified silica aerogel (AMSA) is able to adsorb 0.88 mol CO2/kg AMSA. This study shows that the rice husk silica aerogel modified with APTES could enhance the CO2 adsorption performance due to the physisorption and chemisorption

Directly Heated High Surface Area Solid Phase Microextraction Sampler for Rapid Field Forensic Analyses

2009 ◽  
Vol 81 (21) ◽  
pp. 8724-8733 ◽  
Author(s):  
Scott A. Ramsey ◽  
Robert V. Mustacich ◽  
Philip A. Smith ◽  
Gary L. Hook ◽  
Brian A. Eckenrode
Keyword(s):  
Surface Area ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
High Surface ◽  
High Surface Area

Zeolite Socony Mobil-5 ordered mesoporous carbon as a fiber coating for solid-phase microextraction

2015 ◽  
Vol 7 (19) ◽  
pp. 8165-8171 ◽  
Author(s):  
Shuaihua Zhang ◽  
Qian Yang ◽  
Zhi Li ◽  
Wei Gao ◽  
Chun Wang ◽  
...  
Keyword(s):  
Mesoporous Carbon ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Steel Wire ◽  
Sol Gel ◽  
Ordered Mesoporous Carbon ◽  
Fiber Coating ◽  
Ordered Mesoporous ◽  
Coating Method ◽  
Polycyclic Aromatic

An ordered mesoporous carbon OMC-ZSM-5 was synthesized and immobilized onto a stainless steel wire by a sol–gel coating method to prepare SPME fiber. The SPME with the OMC-ZSM-5 coated fiber coupled with GC/FID was successfully used to determine trace polycyclic aromatic hydrocarbons in soil samples.

Tailored Silica Based Xerogels and Aerogels for Insulation in Space Environments

2010 ◽  
Vol 63 ◽  
pp. 41-46 ◽  
Author(s):  
Luisa Durães ◽  
Marta Ochoa ◽  
António Portugal ◽  
Nelson Duarte ◽  
João Paulo Dias ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Acid Base ◽  
Highly Porous Materials ◽  
Small Pore ◽  
Space Environments ◽  
Highly Porous ◽  
Very High

In this work, the sol-gel technology is used to produce silica based xerogels and aerogels suitable for insulation applications in Space. The properties of the obtained materials are tailored varying the precursor – Methyltrimethoxysilane (MTMS) or Methyltriethoxysilane (MTES), and the solvent – methanol or ethanol. A two-step acid-base catalyzed synthesis is used, being the obtained gels dried at atmospheric pressure, in the case of xerogels, and in supercritical conditions, for aerogels. Density and thermal conductivity must be made as low as possible for the sought application and only highly porous materials can fulfill this requirement. The obtained xerogels and aerogels, either with MTMS or MTES, show very promising properties for thermal insulation in Space, when methanol is used as solvent. The more suitable materials are obtained with MTMS and exhibit very low density (80-100 kg/m3), very high surface area (~ 400 m2/g) and small pore size (~ 30-40 Å). They also show moderate flexibility and a remarkable hydrophobic character (~ 150º).

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