Efficient synthesis of ordered organo-layered double hydroxides

Theoretical studies of the interaction of terephthalate anion in MgAl-layered double hydroxides

“…Notwithstanding, the error between the theoretical calculation and the experimental measure is less than 3%. Also, the distance from the oxygen of the layer to the oxygen of the carboxylic group, around 2.60 Å, in face of, 2.70 Å obtained experimentally (Kooli et al, 1996), (Maxwell et al, 1999), (Greenwell et al, 2010), (Benito et al, 2009), (Benito et al, 2010), (Kovanda et al, 2011), (Arias et al, 2013).…”

“…1) perpendicular to the hydroxide layers, can be observed if x = 1/3 or 1/2 for instance. On the other hand, when the molar fraction is less than 1/3 an horizontal orientation of TA anion, with the C 2 axis parallel to the hydroxide layers, it is easy to be found (Kooli et al, 1996), (Newman et al, 1998), (Greenwell et al, 2010). Although the structure itself is well defined, the characterization of the interlayer space is extremely difficult by experimental techniques.…”

“…Also, by reason of their capacity of expansion along the c vector, LDHs are suitable to intercalate a large number of organic species, making them useful in many fields such as medicine, photochemistry, molecular separation, catalysis, and anion-exchange (Kloprogge & Frost, 1999), (Kumar et al, 2007), (Costa et al, 2010), (Costa et al, 2011), (Costantino et al, 2013). Although the most common anion is carbonate, terephthalate (TA) has been widely studied most because of its use as swelling agent, to assist the incorporation of bulkier anions (Drezdzon, 1988), (Vucelic et al, 1995), and also because its relatively rigid nature enables studies on the dynamics of interlayer anions, both by spectroscopic, and computational studies (Greenwell et al, 2010). The synthesis of LDH with high layer charge is desirable for some applications such as catalysis (Arias et al, 2013).…”

Enhanced removal of triphosphate by MgCaFe-Cl-LDH: Synergism of precipitation with intercalation and surface uptake

“…For example, a number of inorganic (such as phosphates, arsenate, selenate, and chromate) [3][4][5] and organic anions (folate, nitrophenol, terephthalate, etc.) [6][7][8] can be removed using LDHbased materials. Note that phosphorus-relevant anions (phosphate, diphosphate and polyphosphate, etc.)…”

A green route to synthesize layered double hydroxides

“…LDHs are mainly prepared by co‐precipitation , ion exchange , hydrothermal method , and the calcination regeneration method . Among them, coprecipitation is the mostly used method because of its convenience and low cost.…”