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Negative impacts of wastewater contamination include harm to the environment, people, plants, and animals. Metal-based heterogeneous catalysts, particularly transition metal oxide catalysts, are a therapeutic option. However, they have limited reusability and cause secondary contaminations through metal leaching. In this work, a new membrane catalyst made of perovskite-type fiber was created and tested to remove methylene blue from wastewater. These innovative 3D perovskite ceramic catalysts work well in the breakdown of pollutants and dramatically lessen possible secondary contaminations caused by metal leaching from catalysts. [Display omitted] • La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) hollow fibre perovskite catalyst was developed. • It was evaluated for the removal of methylene blue via advanced oxidation. • It significantly reduces secondary contamination of metal leaching from perovskite. [ABSTRACT FROM AUTHOR]

Tonnage oxygen production is still mostly based on the traditional technology of cryogenic distillation, a century-old, capital- and energy-intensive method. It is critical to create a novel low-cost, energy-efficient approach that can meet the growing demand for oxygen in industry from the clean environmental or energy standpoint. Ruddlesden-Popper (RP) perovskite like oxides -based ionic transport membranes for the oxygen transport have recently been developed as a possible replacement for the traditional cryogenic approach. In this work, we detailly reviewed the progress of RP perovskite oxides based membranes for oxygen transport from separation mechanism, material types, synthesis methods to the final separation performance. This work advances the development of RP perovskite membranes for oxygen transport. [Display omitted] • MIEC oxides are the prominent materials for oxygen transport. • Oxygen conduction mechanism of MIEC oxides was discussed. • Preparation methods of MIEC oxide permeable materials were summarized. [ABSTRACT FROM AUTHOR]

The mixed ionic–electronic conducting (MIEC) oxides have generated significant research efforts in the scientific community during the last 40 years. Since then, many MIEC compounds, most of which are based on perovskite oxides, have been synthesized and characterized. These compounds, when heated to high temperatures, form solid ceramic membranes with high oxygen ionic and electrical conductivity. The driving force for oxygen ion transport is the ionic transfer of oxygen from the air as a result of the differential partial pressure of oxygen across the membrane. Electronic and ionic transport in a range of MIEC materials has been studied using the defect theory, particularly when dopants are introduced to the compound of interest. As a result, many types of ionic oxygen transport limits exist, each with a distinct phase shift depending on the temperature and partial pressure of oxygen in use. In combination with theoretical principles, this work attempts to evaluate the research community's major and meaningful achievements in this subject throughout the preceding four decades. [Display omitted] • MIEC oxides are the prominent materials for oxygen transport. • Oxygen conduction mechanism of MIEC oxides was discussed. • Preparation methods of MIEC oxide permeable materials were summarized. [ABSTRACT FROM AUTHOR]