Swelling and Gel/Sol Formation of Perchlorate-Type Layered Double Hydroxides in Concentrated Aqueous Solutions of Amino Acid-Related Zwitterionic Compounds

Langmuir ◽  
2013 ◽  
Vol 29 (8) ◽  
pp. 2562-2571 ◽  
Author(s):  
Nobuo Iyi ◽  
Shinsuke Ishihara ◽  
Yoshiro Kaneko ◽  
Hirohisa Yamada
Keyword(s):  
Amino Acid ◽  
Aqueous Solutions ◽  
Layered Double Hydroxides ◽  
Concentrated Aqueous Solutions ◽  
Double Hydroxides

scholarly journals Highly-polar layered double hydroxides are efficient adsorbents of low-concentrated trihalomethanes present in water

2019 ◽  
Vol 62 (3) ◽  
Author(s):  
Alejandra Morales ◽  
Magali Hernández ◽  
Erik Pérez-Ramírez ◽  
Ariel Guzmán-Vargas ◽  
Enrique Jaime Lima Muñoz
Keyword(s):  
Aqueous Solutions ◽  
Layered Double Hydroxides ◽  
Concentrated Aqueous Solutions ◽  
Double Hydroxides

Abstract. Replacement of (Al(OH)6)3- blocks by (AlF6)3- was explored as a strategy to modify the dipolarity of layered double hydroxides materials (LDHs). The presence of fluorine augments the dipolarity/polarizability of LDHs. LDHs were tested as adsorbents of the trihalomethanes CHCl3 and CHBr3 that are present (low concentrated) in water. Fluorinated LDHs were significantly more efficient compared to that without fluorine. Thermal treated fluorinated LDHs are able to remove 95% and 90% of CHCl3 and CHBr3, respectively, present in low concentrated aqueous solutions. The effect of concentration of triahalomethanes, time of contact and structure of adsorbent were explored.  Linear isotherms were obtained when un-fluorinated adsorbents were used but the isotherm turns to match that of Freundlich-type when adsorbent contains fluorine. Resumen. La sustitución de iones  de (Al (OH)6) 3- por (AlF6)3- se investigó como una estrategia para modificar la dipolaridad de los hidróxidos dobles laminares (HDL). La presencia de flúor aumenta la dipolaridad / polarizabilidad de los HDL. Los HDL se probaron como adsorbentes de los trihalometanos CHCl3 y CHBr3 presentes a bajas concentraciones en agua. Los HDL fluorados fueron significativamente más eficientes en comparación con los que no contenían  flúor. Los HDL fluorados tratados térmicamente pueden eliminar 95% y 90% de CHCl3 y CHBr3, respectivamente, presentes en soluciones acuosas a baja concentración. Se examinó el efecto de la concentración de trihalometanos, el tiempo de contacto y la estructura del adsorbente. Se obtuvieron isotermas lineales cuando se usaron adsorbentes no fluorados; en contraste, cuando el adsorbente contiene flúor la isoterma coincide con la de tipo Freundlich.

Removal of lead ions from aqueous solutions using intercalated tartrate-Mg–Al layered double hydroxides

2013 ◽  
Vol 52 (22-24) ◽  
pp. 4266-4272 ◽  
Author(s):  
Yamin Yasin ◽  
Maszlin Mohamad ◽  
Ahmad Saad ◽  
Azlin Sanusi ◽  
Faujan Haji Ahmad
Keyword(s):  
Aqueous Solutions ◽  
Layered Double Hydroxides ◽  
Lead Ions ◽  
Double Hydroxides

Effect of complexing anions on sorption of U(VI), 90Sr, and 90Y from aqueous solutions on layered double hydroxides of Mg, Al, and Nd

2011 ◽  
Vol 53 (5) ◽  
pp. 504-509 ◽  
Author(s):  
S. A. Kulyukhin ◽  
E. P. Krasavina ◽  
I. A. Rumer ◽  
L. V. Mizina ◽  
N. A. Konovalova ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Layered Double Hydroxides ◽  
Double Hydroxides ◽  
Complexing Anions
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