期刊
DALTON TRANSACTIONS
卷 51, 期 39, 页码 14945-14951出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2dt02608b
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资金
- MEXT [JPMXS0440500021]
- JSPS
- DFG [18J22738]
Acid treatment of crystalline silicates is a simple method for preparing microporous silica materials, but its success depends on treatment conditions and the composition and crystallinity of the starting silicates. Acid-treated Eu-AV-9 showed both crystallinity and microporosity, capable of adsorbing CO2, with an increase in micropore volume and BET area with longer treatment time.
Acid treatment of crystalline silicates is a facile method of creating pores for the preparation of crystalline silica-based microporous materials, but its success depends on the acid treatment conditions and both the composition and crystallinity of the starting silicates. Here, europium silicate Eu-AV-9 containing Na+, K+, and Eu3+ ions was treated with acetic acid for 1 d or 14 d to synthesize microporous silicate with high Eu loading by the selective leaching of K+ and Na+ from the silicate. The acid-treated Eu-AV-9 had both crystallinity and microporosity capable of adsorbing CO2, while the adsorption of Ar was very low. In addition, the values of both micropore volume and BET area of acid-treated samples increased when the time of acid treatment was increased. This result was attributed to the formation of structural defects caused by eliminating Eu in Eu-AV-9 over time of acid treatment.
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