热处理对粉煤灰酸渣基二氧化硅气凝胶结构和疏水性的影响

doi:10.19964/j.issn.1006-4990.2021-0291

Abstract

Abstract:

Fly ash acid sludge is by-product of fly ash after alumina extraction by acid leaching process,and its main compo-nent is amorphous silica.Its resource utilization not only solves the environmental problems caused by the accumulation of fly ash acid sludge,but also can obtain silica aerogels with high added value.SiO₂ aerogels with mesoporous structure represented a low density of 0.083 g/cm³,high surface area of 708 m²/g and high hydrophobicity（contact angle of 143°）were prepared by sol-gel method,solvent exchange/surface modification and atmospheric drying using the sodium silicate derived from fly ash acid sludge.The structure and hydrophobicity of SiO₂ aerogels before and after heat treatment were characterized by thermogravimetric analyzer,fourier transform infrared spectrometer,contact angle tester,scanning electron microscope and N₂ adsorption-desorption test.The experimental results indicated that with the increase of heat treatment temperature,the specific surface area of SiO₂ aerogels increased,and the hydrophobicity gradually decreased until it disappeared.When the heating temperature reached to 300 ℃,the hydrophobicity of silica aerogels remained unchanged（contact angle of 128°）,and their den- sity was 0.080 g/cm³.After heating temperature was ranged from 400 ℃ to 600 ℃,the surface characteristic of silica aerogels with the mesoporous structure became hydrophilic and the density of silica aerogels increased from 0.073 to 0.078 g/cm³.

Key words: SiO₂ aerogels, fly ash acid sludge, ambient pressure drying, thermal treatment, hydrophobicity

CLC Number:

TQ127.2

MA Yue,CHENG Yan. Effect of thermal treatment on structure and hydrophobicity of SiO₂aerogels derived from fly ash acid sludge[J]. Inorganic Chemicals Industry, 2022, 54(3): 109-112.

Figures/Tables 6

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Table 1

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References 19

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热处理温度/℃	密度/ （g·cm^-3）	比表面积/ （m²·g^-1）	孔隙率/ %
未经热处理	0.083	708	96.21
300	0.080	739	96.34
400	0.073	860	96.66
500	0.075	872	96.58
600	0.078	881	96.44

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Inorganic Acid-Base-Salt Committee of CIESC

Effect of thermal treatment on structure and hydrophobicity of SiO₂aerogels derived from fly ash acid sludge

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Effect of thermal treatment on structure and hydrophobicity of SiO2 aerogels derived from fly ash acid sludge