Abstracts Book - IMRC 2018

• SB6-P026
HYDROTALCITES INTERCALATED WITH CITRATE TO BE USED AS
BIOCIDAL MATERIALS
Alvaro Sampieri 1 , Geolar Fetter 2 , Franchescoli Didier Velázquez Herrera 2 , Marta Lobo Sánchez 2
1 Benemerita Universidad Autonoma de Puebla, Facultad de Ingeniería Química, Mexico.
2 Benemerita Universidad Autonoma de Puebla, Facultad de Ciencias Químicas, Mexico.
Hydrotalcites are natural or synthetic minerals. They are anionic clays with
positively charged layers balanced by hydrated anions located between layers.
Commonly, these anions are carbonates, but they can be replaced by a great
number of anions such as nitrates, carboxylic acids or even DNA. Consequently,
the hydrotalcite network can accept a great number of species, independently
of their sizes, compositions or charges. Frequently, the interlayered anions are
species that present activity in catalytic reactions as hemoglobin for CO
conversion, but recently, it was reported that hydrotalcites can host species
having bactericidal activity such as chlorophyllin forming an hybrid material. It
must be noted that the hydrotalcites themselves have shown biocidal properties
where this activity is attributed to the metallic ions or hydroxides liberated the
structure to the microorganism medium. Thus, in this work, bactericidal
hydrotalcites were intercalated with citrate, an antimicrobial compound, which
could strengthen the biocidal activity of the hydrotalcites. MgAl-hydrotalcites
were synthesized simultaneous with sodium citrate by co-precipitation at a pH
of 9 and crystallization in presence of microwave irradiation, varying a metal
molar ratio 2 to 4. Citrate intercalated hydrotalcites were characterized by XDR,
FTIR, SEM-EDS and nitrogen physisorption. It was found that the amount and
orientation of citrate intercalated between hydrotalcite layers depended not
only on the metal molar ratio but also on the crystallization method.
Keywords: Bactericidal hydrotalcites, microwave irradiation, hybrid material
Presenting authors email: asamcr@yahoo.com