6 documents found, page 1 of 1

Degradation of pollutants in water by Fenton-like oxidation over LaFe-catalysts...

The effect of different parameters such as temperature, type of catalyst and hydrogen peroxide (H2O2) concentration on the degradation of pollutants in water by Fenton-like oxidation was studied by using the Box-Behnken design (BBD), an effective statistical model to design the experiments. Concerning the heterogeneous catalysts, three bimetallic catalysts with lanthanum (La) and iron (Fe) ion-exchanged into ze...

Exploring optimization of zeolites as adsorbents for rare earth elements in con...

Unsupervised machine learning (ML) techniques are applied to the characterization of the adsorption of rare earth elements (REEs) by zeolites in continuous flow. The successful application of principal component analysis (PCA) and K-Means algorithms from ML allowed for a wide range assessment of the adsorption results. This global approach permits the evaluation of the different stages of the sorption cycles an...

Comparison of the catalytic behaviour of rare earth elements loaded in zeolites...

Rare earth elements (REE) are a group of chemical elements with a enormous industrial application, due to their diversified properties (chemical, optical, electrical, metallurgical, catalytical and magnetic).1 Zeolites are an aluminosilicate material extensively studied in different processes, due to their properties (ion exchange capacity, high surface area and porosity).2 Zeolites and REE as heterogeneous cat...

Recovery of rare earth elements from wastewater towards a circular economy

The use of rare earth elements is a growing trend in diverse industrial activities, leading to the need for eco-friendly approaches to their efficient recovery and reuse. The aim of this work is the development of an environmentally friendly and competitive technology for the recovery of those elements from wastewater. Kinetic and equilibria batch assays were performed with zeolite, with and without bacterial b...

A comparative study of rare earth metals recovery by bacteria and algae

Giant concha bullosa: a curable cause of nasal obstruction

Introduction: Nasal obstruction is a common problem in Portugal. It can have negative influences on quality of life and repercussions for family dynamics. It has several causes. Among them is concha bullosa. The objectives of this article are to describe a case of giant concha bullosa and to summarize the approach to the patient with nasal obstruction in primary care. Case description: A 50 year-old woman prese...