Study on Electrosorption Removal of Chloride Ion from Reclaimed Water

Yang, Can; Yang, Guo Li; Shi, Yong Jiang; Chen, Shou Jie

doi:10.4028/www.scientific.net/amr.356-360.2015

Cited by 2 publications

(1 citation statement)

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“…By contrast, alumina inorganic salts are easily controlled during gel preparation and are more economical. Many strategies, including ion-exchange resin, electrosorption ion removal and inorganic ion exchanger [28][29][30][31] for chloride ion removal, have been developed. Wu et al [32] fabricated Al 2 O 3 -SiO 2 composite aerogels via TEOS and AlCl 3 •6H 2 O as precursors, which showed a γ-Al 2 O 3 phase and high SSA of 630.6 m 2 /g after heat treatment at 600 • C. However, the SSA of Al 2 O 3 -SiO 2 composite aerogels decreased to 277.7 m 2 /g due to volume shrinkage after heat treatment at 1000 • C. Chen et al [33] prepared Al 2 O 3 -SiO 2 aerogels using TEOS and AlCl 3 •6H 2 O as precursors and found that the samples with a molar ratio of Al/Si = 3:1 possessed better thermal insulation performance and thermal stability, but the alumina proportion was ultra-high, which was not suitable for industrial-scale production.…”

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confidence: 99%

Alumina-Doped Silica Aerogels for High-Temperature Thermal Insulation

Wang

Liu

et al. 2021

Gels

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In this study, we used two methods to prepare alumina-doped silica aerogels with the aim of increasing the thermal stability of silica aerogels. The first method was physical doping of α-Al2O3 nano powders, and the second method was to create a chemical compound via the co-precursor of TEOS and AlCl3·6H2O in different proportions. The shrinkage, chemical composition, and specific surface area (SSA) of samples after heating at different temperatures were analyzed. Our results show that the silicon hydroxyl groups of samples derived from AlCl3·6H2O gradually decreased and nearly disappeared after heating at 800 °C, which indicates the complete dehydration of the silicon hydroxyl. Thus, the samples exhibited a large linear shrinkage and decreased SSA after high-temperature heat treatment. By contrast, samples doped with α-Al2O3 powders retained abundant silicon hydroxyl groups, and the 6.1 wt.% α-Al2O3-doped sample exhibited the lowest linear shrinkage of 11% and the highest SSA of 1056 m2/g after heat treatment at 800 °C. The alumina-doped silica aerogels prepared using a simple and low-price synthesized method pave the way for the low-cost and large-scale production of high-temperature thermal insulation.

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