Physicochemical characterisation and hydrothermal stability investigation of cobalt-incorporated silica xerogels

RSC Advances ◽  
2014 ◽  
Vol 4 (36) ◽  
pp. 18862-18870 ◽  
Author(s):  
Liang Liu ◽  
David K. Wang ◽  
Dana. L. Martens ◽  
Simon Smart ◽  
Ekaterina Strounina ◽  
...  
Keyword(s):  
Cobalt Oxide ◽  
Structural Rearrangement ◽  
Hydrothermal Stability ◽  
Silica Xerogels ◽  
Silica Network ◽  
Microporous Silica ◽  
Stability Investigation ◽  
Physicochemical Characterisation

High cobalt oxide concentrations were able to shield the microporous silica network from excessive structural rearrangement during harsh hydrothermal testing.

Hydrothermal stability investigation of micro- and mesoporous silica containing long-range ordered cobalt oxide clusters by XAS

2015 ◽  
Vol 17 (29) ◽  
pp. 19500-19506 ◽  
Author(s):  
Liang Liu ◽  
David K. Wang ◽  
Peter Kappen ◽  
Dana L. Martens ◽  
Simon Smart ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Cobalt Oxide ◽  
Long Range ◽  
Hydrothermal Stability ◽  
Range Order ◽  
Long Range Order ◽  
Hydrothermal Conditions ◽  
Microporous Silica ◽  
Stability Investigation ◽  
The Stability

Cobalt oxide clusters of long range order greatly improved the stability of microporous silica under harsh hydrothermal conditions.

Performance of Cobalt-Silica Membranes through Pervaporation Process with Different Feed Solution Concentrations

2020 ◽  
Vol 981 ◽  
pp. 342-348 ◽  
Author(s):  
Muthia Elma ◽  
Gesit Satriaji Saputro
Keyword(s):  
Cobalt Oxide ◽  
Saline Water ◽  
Water Flux ◽  
Feed Solution ◽  
Water Desalination ◽  
Silica Xerogels ◽  
Silica Membranes ◽  
Salt Rejection ◽  
Bet Analysis ◽  
Value Of Water

This work shows the performance of cobalt-silica membranes through water desalination via pervaporation process. The aim of this work is to find out the performance of the cobalt oxide as a templating agent in the silica cobalt membranes for water desalination via pervaporation process. It also aims to investigate the water flux and salt rejection of silica cobalt membranes using artificial saline water. The concentration of cobalt oxide as a template for fabricating cobalt-silica membranes were 5 – 35 wt%. The feed solution applied during pervaporation process were 0.3 – 5 wt% NaCl with operating temperatures of 25, 40 and 60 °C. The silica xerogels were characterized using Fourier Transform Infrared (FTIR), Scanning Electron Microscopy (SEM) and Brunauer-Emmett-Teller (BET). From the FTIR result, it is known that the higher the concentration of cobalt in the membrane, the more silanol and siloxane groups. Based on BET analysis, Si-Co 35 wt% membrane has largest pore volume (0.129387 cm3g-1). In addition, the highest value of water flux (7.2660 kg.m-2.h-1) and salt rejection (100%) is achieved by Si-Co 5% membrane in 0.3% NaCl feed at 60 °C. The value of water flux decreases and the value of salt rejection increases with increasing feed concentration.

Hydrothermal stability of pure and modified microporous silica membranes

1995 ◽  
Vol 30 (11) ◽  
pp. 2803-2808 ◽  
Author(s):  
G. P. Fotou ◽  
Y. S. Lin ◽  
S. E. Pratsinis
Keyword(s):  
Hydrothermal Stability ◽  
Microporous Silica ◽  
Silica Membranes

scholarly journals Binary gas mixture and hydrothermal stability investigation of cobalt silica membranes

2015 ◽  
Vol 493 ◽  
pp. 470-477 ◽  
Author(s):  
Liang Liu ◽  
David K. Wang ◽  
Dana L. Martens ◽  
Simon Smart ◽  
João C. Diniz da Costa
Keyword(s):  
Hydrothermal Stability ◽  
Gas Mixture ◽  
Silica Membranes ◽  
Stability Investigation ◽  
Binary Gas Mixture

Influence of sol–gel conditioning on the cobalt phase and the hydrothermal stability of cobalt oxide silica membranes

2015 ◽  
Vol 475 ◽  
pp. 425-432 ◽  
Author(s):  
Liang Liu ◽  
David K. Wang ◽  
Dana. L. Martens ◽  
Simon Smart ◽  
João C. Diniz da Costa
Keyword(s):  
Cobalt Oxide ◽  
Sol Gel ◽  
Hydrothermal Stability ◽  
Silica Membranes

Gas Permeation and Microstructure of Silica Membranes Prepared Using an Organic Template Approach by Sol-Gel Processing

1996 ◽  
Vol 431 ◽  
Author(s):  
G. Z. Cao ◽  
C. J. Brinker
Keyword(s):  
Sol Gel ◽  
Gas Permeation ◽  
Hybrid Network ◽  
Organic Template ◽  
Silica Xerogels ◽  
Microporous Silica ◽  
Silica Membranes ◽  
Oxidative Pyrolysis ◽  
Lower Extent ◽  
Gel Processing

AbstractThis paper investigates microporous amorphous silica membranes prepared using an organic template sol-gel approach. We find that the introduction of organic methacryloxypropyl ligands results in a reduced average condensation rate and a lower extent of branching that promotes the collapse of the hybrid network upon drying leading to relatively dense hybrid organic-inorganic xerogels and films. Microporous silica xerogels and membranes, prepared by oxidative pyrolysis of the organic templates at 300 °C for 5 hours in oxygen, contained pores with constrictions of approximately 0.35 nm in diameter with a very narrow size distribution, as evidenced by single gas permeation measurements of a series of probe molecules.

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