Synthesis, Characterization and Exchange Reactions of Layered Double Hydroxides of Copper and Aluminum, Intercalated with Sulfate

Journal of the Brazilian Chemical Society

article

Sotiles, Anne R.¹  Grassi, Marco T.¹  Santos, Mayara P. dos¹  Wypych, Fernando¹ 

[1] Departamento de Química, Universidade Federal do Paraná

关键词: layered double hydroxide;    sulfate;    exchange reaction;    copper;    aluminum;   

DOI  :  10.21577/0103-5053.20200166

学科分类：内科医学

来源: SciELO

【 摘 要 】

Layered double hydroxides (LDHs) of Cu:Al in the molar ratio of 2:1, intercalated with sulfate, sulfate/(Li + , Na + , K + or NH 4 + ), NO 3 - and CO 3 2- , were synthesized by co-precipitation with increasing pH. The materials were submitted to exchange reactions using B 2 SO 4 (B = Li + , Na + , K + , NH 4 + ) solutions in an attempt to replace previously intercalated cations or incorporated cations without removing intercalated sulfate. X-ray diffraction (XRD) patterns and Fourier transform infrared (FTIR) spectra were consistent with the expected intercalated species and scanning electron microscopy (SEM) images indicated submicrometric platelet-like particles, typical of LDHs. The chemical compositions of all phases were confirmed by inductively coupled plasma optical emission spectrometry (ICP OES) and thermogravimetric analyses (TGA). In the exchange reactions, only in [Cu 6 Al 3 (OH) 18 ][Na(H 2 O) 6 (SO 4 ) 2 ]·6H 2 O the sodium cations were almost totally replaced with lithium, potassium and ammonium, without removing the intercalated sulfate.

【 授权许可】

CC BY