| Sumario: | Inorganic arsenic water contamination turns out to be a serious problem worldwide. According to the World Health Organization (WHO), more than 140 million people worldwide consume water with high levels of arsenic, causing diseases such as cancer. Arsenic is found as As3+ (As(OH)3) mainly in surface water effluents, which increases the interest in its removal with low-cost materials and regeneration capacity. For this reason, in this chapter, the study of As(III) adsorption on hydrotalcite-derived mixed oxides ZnAl, synthesized by an alternative simultaneous microwave/ultrasound irradiation method, followed by the formation of mixed oxides by calcination. The specific surface area of the calcined sample obtained by simultaneous irradiation was about 59 m2/g, being higher compared to the individually irradiated materials, ultrasound, and microwaves, 20 and 50 m2 /g, respectively. This indicated that the increase in the specific surface area was attributed to a synergistic effect promoted by combining the irradiation methods (microwaves-ultrasound). SEM images show that the morphology of the mixed oxides also depends on the irradiation mode used during the hydrotalcite synthesis, generating an arrangement of two phases of particles. Simultaneous irradiation provides a simple way to obtain materials with better textural properties in a short synthesis time and favors a high adsorption capacity (0.52 mg/g), compared to individually irradiated materials.
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