Synthesis of NiFe₂O₄-LDH composites with high adsorption and photocatalytic activity for methyl orange degradation
2018
Valencia López, Cristian Daniel | Zafra Calvo, Mario | Martín de Vidales Calvo, María José | Blanco Gutiérrez, Verónica | Atanes Sánchez, Evangelina | Merayo Cuevas, Noemí | Fernández Martínez, Francisco | Nieto-Márquez Ballesteros, Antonio | Santos García, Antonio Juan dos
The presence of hazardous chemicals in wastewater produced by industrial activities and human metropoles is threating the availability of safe drinking water. The development of a multifunctional material coupling adsorption and photocatalytic activity is hereby particularly promising for the removal of pollutants. We have proved the adsorption and catalytic activity of NiFe₂O₄-layered double hydroxide (LDH) composite through the degradation of methyl orange (MO) at room temperature under visible light. This degradation is enhanced by using a set of small light-emitting diodes (LEDs) providing a uniform 405 nm UV light. The remediation process is based on a first-step rapid adsorption of MO molecules by the LDH structures followed by the photocatalytic oxidation of the pollutant by the (∙OH) radicals produced by the NiFe₂O₄ semiconductor nanoparticles (NPs). The magnetic properties of the ferrite NPs allow a facile separation of the composite from the liquid media via a simple magnet. NiFe₂O₄-LDH composite could find wide application as a highly effective adsorbent/oxidizing catalyst operating under visible or near UV light.
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