Pablo Salgado Mendoza

Universidad Católica de la Santísima Concepción | UCSC · Departamento de Ingeniería Civil

In sewage, several pollutants can be found. Among them, it is possible to find pathogenic microorganisms, which can be classified into three categories: bacteria, viruses and parasites. Some of these pathogens are resistant to conventional disinfection methods, and in the case of chlorine disinfection, toxic by-products can be generated such as tri...

Wood is a complex material whose main chemical constituents are cellulose, hemicellulose, and lignin. These components are studied in various industries after the wood has been processed by chemical or mechanical methods. For the paper industry, it is relevant to determine the pentosan content in cellulose pulp because it indicates the degree of re...

Amitriptyline (AMT) is the most widely used tricyclic antidepressant and is classified as a recalcitrant emergent contaminant because it has been detected in different sources of water. Its accumulation in water and soil represents a risk for different living creatures. To remove amitriptyline from wastewater, the Advanced Oxidation Processes (AOPs...

The Advanced Oxidation Process (AOPs) are chemical systems characterized by the production of hydroxyl radicals and other reactive oxygen species. One of the most important AOPs systems are Fenton and...

In this work, the Fenton technology was applied to decolorize methylene blue (MB) and to inactivate Escherichia coli K12, used as recalcitrant compound and bacteria models respectively, in order to provide an approach into single and combinative effects of the main process variables influencing the Fenton technology. First, Box–Behnken design (BBD)...

The use of constructed wetlands as a wastewater treatment system is a feasible solution for rural areas. However, these systems do not efficiently eliminate pathogenic microorganisms. Therefore, it is necessary to implement disinfection systems such as ultraviolet (UV) disinfection systems in constructed wetlands. To evaluate the behavior of a UV s...

In recent decades, nanotechnology has received great attention due to its broad fields of application. The conventional processes applied to the synthesis processes of nanomaterials can be classified in chemical and physical methods. These technologies involve several environmental and cost problems. In order to avoid the problems caused by convent...

The green synthesis of nanoparticles allows for obtaining nanomaterials using plant extracts, avoiding the use of toxic and dangerous chemical compounds. The aim of this study was to evaluate the effect of phenolic compounds in plant extracts on the synthesis of iron oxide nanoparticles (FexOy-NPs) with photocatalytic activity. Accordingly, the phe...

1,2-dihydroxybenzenes (DHBs) are organic compounds which are widely studied as they are applied to advanced oxidation processes (AOPs). These compounds are also related to the development of oxidative stress, wood biodegradation, and neuronal disease in humans. DHBs are metal ligands with pro-oxidant and antioxidant properties. These activities are...

The Fenton reaction is a redox cycle in which iron reacts with H2O2 to produce several reactive species, such as hydroxyl radicals ([rad]OH), perhydroxyl radicals ([rad]OOH), ferryl ions (Fe(IV)) and singlet oxygen (¹O2). The type and amount of reactive species produced by this redox system can change depending on the reaction conditions. For examp...

This study reports on the kinetics of the early steps that mediate the reactions of substituted 1,2-dihydroxybenzenes (1,2-DHB) with Fe3+. The rate constants of the three processes identified by means of the stopped-flow technique are affected by the electron-withdrawing or electron-donating ability of the substituent. The fastest process is assign...

Fenton systems are interesting alternative to advanced oxidation processes (AOPs) applied in soil or water remediation. 1,2-Dihydroxybenzenes (1,2-DHBs) are able to amplify the reactivity of Fenton systems and have been extensively studied in biological systems and for AOP applications. To develop efficient AOPs based on Fenton systems driven by 1,...

The main reactions involved in the advanced oxidation processes are Fenton (Fe2+ and H2O2) and Fenton-like (Fe3+ and H2O2) systems. These systems involve the production of oxidizing species, mainly oxidant species, including hydroxyl radical (•OH), superoxide/perhydroxyl radicals (O2•-/HO2•), oxygen singlet (1O2) and ferryl ions (Fe4+). Fe3+ ligand...

One of the most important sources of reactive oxygen species (ROS) in biological systems is the Fenton reaction. In this, the Fe2+ or Fe3+ reacts with H2O2 to produce ROS as the hydroxyl radical (∙OH), superoxide radical (O2-) and singlet oxygen (1O2). The main ROS, responsible for the high oxidizing power of the Fenton reaction, is not clear. Som...

A dihydroxybenzenes(DHB)-driven Fenton reaction was found to be more efficient than a simple Fenton reaction based on OH radical and activated species production. The reason for this enhanced reactivity by [Fe DHB] complexes is not well understood, but results suggest that it may be explained by the formation of oxidation species different from tho...

A dihydroxybenzenes (DHB)-driven Fenton reaction was found to be more efficient than a simple Fenton reaction based on radical •OH radical and activated species production. The reason for this enhanced reactivity by [Fe-DHB] complexes is not well understood, but results suggest that it may be explained by the formation of oxidation species differen...