Abstracts Book - IMRC 2018

• SF5-O004
APPLICATION OF LAYERED DOUBLE HYDROXIDES Mg/Fe IN THE
REMOVAL OF ARSENIC PRESENT IN WATER FOR HUMAN
CONSUMPTION
José Ignacio Ceseña Quiñonez 1 , Norma Leticia Gutiérrez Ortega 2 , Eshela Ramos Ramirez 3 , Alma
Hortensia Serafín Muñoz 2 , Berenice Noriega Luna 2 , Elizabeth Pabón Gelves 4
1 Universidad de Guanajuato, Doctorado en Ciencia y Tecnología del Agua, División de
Ingenierías, Mexico. 2 Universidad de Guanajuato, Departamento de Ingeniería Civil, División de
Ingenierías, Mexico. 3 Universidad de Guanajuato, Departamento de Química, División de
Ciencias Naturales y Exactas, Mexico. 4 Universidad Nacional de Colombia, Grupo Ciencia de
Materiales Avanzados. Facultad de Ciencias, Colombia.
Natural phenomena and human activities mobilize the arsenic in the natural
water reservoirs, increasing the risk of being present in high concentrations in
the supply systems for human consumption. Arsenic is considered a toxic metal
for living organism. In humans it has been associated with cardiovascular
diseases, high blood pressure, developmental delay and different types of
cancer. An efficient and low cost layered double hydroxide was employed for
the removal of arsenic in contaminated water. Solids was synthesized by the
coprecipitation method, mixing Mg (II) and Fe (III) precursor salts with an alkaline
solution. Arsenic removal tests were carried out on contact for 24 hours in Bach
system with the solid treated at 180°C and at 230°C, with artificial solutions of
As in different concentrations. In addition, the adsorbent materials were tested
in the elimination of arsenic present in real samples taken a natural reservoir in
spring season. The solid was characterized by XRD, SEM-EDS, FTIR, and DTA-TGA
to understand the behavior of the material in the adsorption. The best arsenic
removal capacity was shown by the thermally treated solid at 230°C, with
adsorption capacity of arsenic of 801.2mg/g adsorbent at a 24h time. The
adsorption isotherm that best describes the removal mechanism was the
Langmuir model with an adsorption kinetic model of pseudo second order.
Acknowledgment: The authors are thankful to the National Council for Science
and Technology (CONACYT, acronyms in Spanish), and the Engineering division
of the University of Guanajuato.
Keywords: Hydrotalcite, Arsenic, Adsorption
Presenting authors email: zehuitzil@hotmail.com