Efficient and sustainable adsorbents with perovskite structure for removal of pollutants from aqueous media

Efficient and sustainable adsorbents with perovskite structure for removal of pollutants from aqueous media

• Autor
• Júlia Botti Rodrigues Fernandes
• Co-autores
• Iasmin dos Santos Oliveira , Marcelo José Barros de Souza , Anne MIchelle Garrido Pedrosa
• Resumo

•  Mixed oxides with perovskite structure are materials which has recently been highlighted as promising adsorbents for removing pollutants from aqueous media. Factors such as metal selection and doping significantly influence achieving the desired phase and application of materials. Materials like LF-9C (LaFeO₃), L3C7F-9C (La_0.3Ca_0.7FeO₃) and L7C3F-9C (La_0.7Ca_0.3FeO₃) were synthesized using a modified proteic method with collagen as a complexing agent, followed by heat treatment at 350 °C and calcination at 900 °C. The materials were characterized by X-ray diffraction, determination of the specific surface area and of the point of zero charge. The results of the adsorption studies show that the materials are efficient adsorbents for the removal of a blue turquoise dye in aqueous media, with efficiency ranging between 36 and 98%, with kinetic fitting with for Pseudo Second Order (PSO) model. The materials were applied in reuse studies and maintained the efficiencies, highlighting the better performance presented by the material without doping. Tested with wastewater from a textile factory, the efficiency (Er) of adsorbents for removal the blue dye present were: LF-9C (Er =12%) L3C7F-9C (Er =13%), L7C3F-9C (Er = 11%), and compared with the silica gel (Er = 11%) and activated carbon (Er = 25%) materials, but only the mixed oxides prepared showed outstanding potential for reuse with maintenance of efficiency, indicating that they are very promising materials. 

• Palavras-chave
• Perovskite; LaFeO3, adsorption of contaminants, materials reuse.
• Área Temática
• Adsorção aplicada ao meio ambiente