MARTA Pazos

MARTA Pazos
University of Vigo | UVIGO · Department of Chemical Engineering

PhD.

About

189
Publications
19,589
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
5,267
Citations
Additional affiliations
June 2009 - October 2009
Technical University of Denmark
February 2008 - September 2010
University of Minho

Publications

Publications (189)
Article
Full-text available
The synthesis and characterization of novel graphene oxide coupled to TiO2 (GO-TiO2) was carried out in order to better understand the performance of this photocatalyst, when compared to well-known TiO2 (P25) from Degussa. Thus, its physical-chemical characterization (FTIR, XRD, N2 isotherms and electrochemical measurements) describes high porosity...
Article
The removal of ionisable drugs (fluoxetine, sulfamethizole and antipyrine) from aqueous solution was performed by conventional adsorption using carbonaceous aerogel pellets as adsorbents. Although more than 96% elimination was achieved for sulfamethizole and antipyrine after 1440 min, only 2.5% fluoxetine was removed. In a multicomponent system, th...
Article
Adsorption process has proven its efficiency in the abatement of pharmaceuticals in liquid media, even if large volumes of wastewater need to be treated. Nevertheless, exhausted adsorbent regeneration is economically and environmentally necessary. For this reason, recent studies are aimed at finding new methods of regeneration. In this study, an on...
Article
Full-text available
In this study, the removal of persistent emerging and dangerous pollutants (pharmaceuticals and pathogens) in synthetic wastewater was evaluated by the application of heterogeneous Advanced Oxidation Processes. To do that, a Metal-Organic Framework (MOF), Basolite® F-300 was selected as a catalyst and combined with peroxymonosulfate (PMS) as oxidan...
Article
Layered double hydroxides (LDHs) containing Mg:Al (molar ratio 3:1) were synthesised by co-precipitation from nitrate salts under alkaline conditions. Their further characterisation by different techniques allowed the determination of their structural, nanotextural and chemical properties. XRD measurements confirmed the high crystallisation with th...
Article
Pharmaceuticals and personal care products (PPCPs) harm ecosystems and human health. The focus is now being put on regulating discharges at wastewater treatment plants (WWTPs). Stressful and lonely lifestyles, accentuated by the COVID-19 outbreak, have led to an increase in the consumption of antidepressants, particularly in the form of Fluoxetine...
Article
Full-text available
Nowadays, water pollution is one of the most dangerous environmental problems in the world. The presence of the so-called emerging pollutants in the different water bodies, impossible to eliminate through conventional biological and physical treatments used in wastewater treatment plants due to their persistent and recalcitrant nature, means that p...
Article
Three carbon materials from a varied origin, composition and porosity have been used as cost-effective cathodes in different electrochemical advanced oxidation processes (i.e. anodic oxidation (AO) and electro-Fenton (EF) in homogeneous and heterogeneous catalysis modalities) for the degradation of an antibiotic (e.g., metronidazole). In general, t...
Article
Contaminants of emerging concern including pharmaceuticals and personal care products are increasingly detected at low concentrations in surface waters. Given the associated toxicity of these compounds, there is the potential for significant impacts on aquatic life and the food chain. Since most pharmaceuticals are not biodegradable, they cannot be...
Article
Water quality is essential to both human and ecosystem health, and a fast detection of emerging pollutants is claimed, along with effective wastewater treatment plants to eliminate these types of substances. The goal of this study was the development of a sensitive and selective methodology to customize a handle device that meets this demand. Cloza...
Article
A high-performance hydrochar was prepared for the first time from a relatively abundant solid biomass waste, loquat cores, by hydrothermal treatment. The ecofriendly modifying agent, citric acid (C6H8O7), was used and compared with well know acids such as H3PO4 and HCl. In order to evaluate the effectiveness of the hydrothermal treatment assisted,...
Article
Full-text available
Soil pollution has become a substantial environmental problem which is amplified by overpopulation in different regions. In this review, the state of the art regarding the use of Advanced Oxidation Processes (AOPs) for soil remediation is presented. This review aims to provide an outline of recent technologies developed for the decontamination of p...
Article
Full-text available
The hunt for efficient and environmentally friendly degradation processes has positioned the heterogeneous advanced oxidation processes as an alternative more interesting and economical rather than homogenous processes. Hence, the current study lies in investigating the efficiency of different heterogeneous catalysts using transition metals in orde...
Article
In this study, the adsorption of a multicomponent mixture of active pharmaceutical compounds, such as Venlafaxine (VLX), Trazadone (TRZ) and Fluoxetine (FLX), was studied in a biochar fixed-bed column. The selection of appropriate biochar (eucalyptus, grapevine cane and holm tree biochar) as an adsorbent was carried out through batch assays. An ins...
Article
In this research, a bench-scale installation was tested for the heterogeneous electro-Fenton treatment of clofibric acid. The setup consists of a pressurized flow-through electrochemical cell equipped with a catalyst fluidized-bed and aerated with a jet mixer. The novelty of the research is two-fold: the use of the pressurized-jet aerator on an ele...
Chapter
Full-text available
Soil pollution poses threat to the environment due to persistence of pollutants, which are strongly sorbed and thus difficult to remove. The treatment processes based on the Fenton reaction, generate a powerful oxidant, the hydroxyl radical, by catalytic decomposition of hydrogen peroxide. This reaction can be carried out in polluted soils by injec...
Article
With the aim of bringing the heterogeneous electro-Fenton (EF) treatment one step closer to a more realistic operation, the scaling-up of that technology was evaluated. Assays were performed firstly at lab scale in a stirred-tank reactor and then at bench scale in a flow setup including a jet aerator and a microfluidic flow-through electrochemical...
Article
In this study, adsorption of a non-steroidal anti-inflammatory drug such as Diclofenac (DCF) on a commercial carbonaceous aerogel honeycomb monolith (NANOLIT®-NQ40) was ascertained. Based on, the overall design of an adsorption treatment should include a feasible regeneration process for the spent adsorbent. In this work, the adsorption/desorption...
Article
In the present research, an eco-approach for the removal of pharmaceuticals from aqueous environment was developed under de principles of circular economy. Therefore, an eco-friendly adsorbent, biochar, was synthesized by the thermochemical valorisation of rice production waste. The rice bran was pyrolyzed at different temperatures (300–750°C) and...
Article
The appearance of pharmaceuticals in the aquatic environments has become a serious problem because of their hazardous effect on the biota. Therefore, great efforts are focussed in the removal to these pollutants from wastewaters. In this study, an innovative technology based on the principles of Zero-Waste for the management of wastewater streams i...
Article
A simple protocol was proposed for the preparation of magnetic chitosan beads ZnFe2O4-CS via a co-precipitation method. The use of synthesized magnetic ZnFe2O4-CS beads as catalyst for the heterogeneous photo-Fenton treatment of chlordimeform insecticide (CDM) was evaluated. The photo-Fenton experiments were carried out with different synthesized c...
Article
Full-text available
Several pesticides and pharmaceuticals (PP) have been detected in the effluent of a full-scale Portuguese Wastewater Treatment Plant (WWTP). Their presence contributed to the environmental burdens associated with the existing treatment of the Municipal Wastewater (MWW) in the impact categories of Human Carcinogenicity, Non-Carcinogenicity, and Fres...
Presentation
Full-text available
Regeneration of Adsorbent by Catalytic Process https://www.mdpi.com/journal/catalysts/special_issues/regeneration_adsorbent
Article
This study proposed an integrated valorisation system, by combining adsorption and electro-Fenton processes for fast and effective micropollutant remediation of a complex pharmaceutical mixture. The pharmaceuticals venlafaxine, fluoxetine and trazodone, commonly detected in the environment (river water and sediment), were selected in this study as...
Article
Full-text available
In this present study, an abundant, available lignocellulosic biomass, sunflower seed shells, SSS, was used as a precursor to prepare an effective eco-adsorbent by treatment with H2SO4. A study of the surface characteristics of raw and acid-treated SSS (ACS) has shown that the addition of H2SO4 greatly affected the physicochemical properties of the...
Article
Overall, investigations about the utilization of electrokinetic technology alone or in combination with other processes have attracted particular attention in recent years for the remediation of soils contaminated with heavy metals and organic compounds. This fact is due to its peculiar benefits together with its capability of operating in a fine a...
Article
Full-text available
The presence of pharmaceutical products in the water cycle may cause harmful effects such as morphological, metabolic and sex alterations in aquatic organisms and the selection/development of organisms resistant to antimicrobial agents. The compounds’ stability and persistent character hinder their elimination by conventional physico-chemical and b...
Chapter
Water soluble dyes are still causing an environmental issue due to the inefficient treatment of wastewaters of dyeing industries. Those dyes have common characteristics which are threatening the environment such as high stability, toxicity, and colourfulness. Intense research has been done on the degradation of these discharges, focusing on photode...
Article
Hydrothermal carbonization (HTC) is a facile, low-cost and eco-friendly thermal conversion process that has recently gained attention with a growing number of publications (lower 50 in 2000 to over 1500 in 2020). Despite being a promising technology, problems such as operational barriers, complex reaction mechanisms and scaling have to be solved to...
Article
Full-text available
In this age, a key target for enhancing the competitiveness of the chemical, environmental and biotechnology industries is to manufacture high-value products more efficiently and especially with significantly reduced environmental impact. Under this premise, the conversion of biomass waste to a high-value added product, biochar, is an interesting a...
Article
Full-text available
This research proposes the application of iron-loaded sepiolite (S-Fe) as a catalytic adsorbent for the unreported 1-butylpyridinium chloride ([bpy] Cl) treatment in an aqueous medium. Initially, sepiolite was selected as an inexpensive and efficacious adsorbent for [bpy] Cl elimination. After that, sepiolite was loaded with iron for the subsequent...
Article
In this study, the application of hydrocolloid and fiber industry wastes and their transformation in biochar and biocomposite as biosorbents for emerging pollutants effective removal was carried out. Initially, the adsorption ability of six different wastes was ascertained in single and competitive removal of sulfamethoxazole (SMX) and methylparabe...
Article
This study presents the applicability of differential pulse voltammetry (DPV) technique to carry out in-depth research of electro-Fenton process. To this end, the degradation of the ionic liquid p-xylene-bis(n-pyridinium bromide) was performed, and the main parameters that influence this process were also evaluated. DPV allowed monitoring the evolu...
Article
In the current study, a novel-fangled sequential approach, adsorption/electro-Fenton, was developed for the elimination of micropollutants from aqueous matrixes. Therefore, the prompt removal of a pharmaceutical, sulfamethizole, by adsorption on carbonaceous materials is proposed. After that, the concentrated solution was treated by electro-Fenton...
Article
Full-text available
The adsorption capacity of the medication methylthioninium chloride (MC) from aqueous solution onto sunflower seed shells (SSS), a low cost and abundant alternative adsorbent, was investigated in a batch system. The surface properties of the adsorbent were characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy...
Article
Sediments play a fundamental role in the aquatic environment, so that the presence of contaminants poses severe concern for the possible negative effects on both environmental and human health. Sediment remediation is thus necessary to reduce pollutant concentrations and several techniques have been studied so far. A novel approach for sediment rem...
Article
The requirement of feasible adsorption-regeneration systems in the treatment of emerging pollutants such as pharmaceuticals is a social demand. In this work, the treatment of a mixture with sulfamethoxazole (SMX) and methyl paraben (MP) was performed by the preparation of biochar derived from the lime fiber waste at different conditions (320-500°C...
Article
The degradation of a pesticide, pymetrozine, by heterogeneous electro-Fenton was performed. Thus, several cathodes were prepared based on carbon felt (CF) by immersion in dispersed solution of carbon black, PTFE and carbon nanofibers (CFN) or biochar (CFB). After evaluating H2O2 electro-generation of the different cathodes, it was detected that by...
Article
Nowadays, the vast majority of pollutants are found at low concentrations in water bodies and their treatment requires efficient and cost-effective strategies. This research proposes the application of two complementary treatments (physical and oxidative) for the removal of the ionic liquid 1-butyl, 2,3-dimethylimidazolium chloride ([bdmim]Cl) from...
Article
In this study, the performance of three commercial available monolithic carbonaceous aerogels (NQ30A, NQ60A and NQ80A) for the removal of different emerging pollutants, detected in water sources, was evaluated. More specifically, the removal of two pharmaceuticals (antipyrine and sulfamethoxazole) and an anti-fungal agent (methyl paraben), widely u...
Article
Full-text available
This study was focused on the generation of sulfate radicals and their applicability as powerful oxidants for degrading complex organic compounds with the final objective of operating in flow systems. To this end, the removal of two compounds from the pharmaceutical industry was assessed, lissamine green and prednisolone. Initially, sulfate radical...
Article
In this study, several scenarios have been evaluated based on Advanced Oxidation Processes (AOPs) in order to develop a combined process that permits to explore the possible synergistic effect of photo and electro-based processes for degrading stable pollutants. To achieve this objective, the selection of a suitable heterogeneous catalyst and react...
Article
This work proposes a hybrid system for the remediation of toxic and/or refractory pollutants, such as the ionic liquid 1-butyl-1-methylpyrrolidinium chloride, which cannot be degraded by conventional methods such as biological oxidation. Therefore, the electro-Fenton process was evaluated as a pre-treatment stage, since it is a powerful technology...
Article
Full-text available
Concern about the current pollution of water environments and the inefficacy of conventional water treatments for the elimination of refractory contaminants has placed electrochemistry in the spotlight. With the objective of demonstrating the diverse applications that electrochemical techniques can have in the area of water remediation, this study...
Article
Full-text available
The search for efficient and environmentally friendly adsorbents has positioned lignocellulosic materials as attractive and low-cost alternatives instead of synthetic materials. Consequently, the present work investigates the efficacy of untreated lime peel (LM) and pineapple core (PP) as biosorbents for Cr(VI) removal. The maximum adsorption capac...
Article
Currently, the interest in eco-friendly treatments for the removal of pollutants has increased and more sustainable treatment solutions are required. In this study, the homogeneous and heterogeneous activation of peroxymonosulfate (PMS) was carried out for the degradation of an industrial dye. Initially, the homogeneous PMS activation by different...
Article
Full-text available
The application of the electro-Fenton process for organic compound mineralisation has been widely reported over the past years. However, operational problems related to the use of soluble iron salt as a homogeneous catalyst involve the development of novel catalysts that are able to operate in a wide pH range. For this purpose, polyvinyl alcohol-al...
Article
This study is focused on the selection of the best piping arrangement for a pilot scale annular channel reactor intended for the remediation of waters and wastewaters. Two annular channel reactors composed of a single UV lamp and distinct piping arrangements were considered: (i) a novel reactor with tangential inlet/outlet pipes – the FluHelik reac...
Poster
Full-text available
Heterogeneous electro-Fenton (HEF) is a promising technique for the remediation of polluted wastewater, since it overcomes the disadvantages of anodic oxidation and Fenton process. In the present study, HEF was preformed using iron alginate spheres as the catalyst and this treatment was applied for the degradation of two ionic liquids (ILs): 1,3-di...
Poster
Full-text available
Degradation of Ionic Liquids by Heterogeneous Electro-Fenton electrochemical process and monitoring by analytical techniques (HPLC, IC and Voltammetry-DPV)
Article
Full-text available
In this study, the degradation of the ionic liquid (IL) 1,3-dicyclohexylbenzimidazolium chloride ([DCy6bim][Cl]) was carried out by applying an heterogeneous electro-Fenton (HEF) treatment using iron alginate spheres (FeAS) as catalyst. Initial trials were performed at current between 50 and 250 mA, different FeAS dosages (1–5 g), and [DCy6bim][Cl]...
Article
In this study, magnetic iron particles doped with TiO2 were synthetized to be used as a photo electro Fenton catalyst, being easily eliminated from the treated solution. Thus, the synergistic and scarcely reported combination of photocatalyst with electro Fenton process was evaluated for the degradation of an emerging pollutant: the ionic liquid 1-...
Article
Full-text available
Prednisolone is a widely prescribed synthetic glucocorticoid and stated to be toxic to a number of non-target aquatic organisms. Its extensive consumption generates environmental concern due to its detection in wastewater samples at concentrations ranged from ng/L to μg/L that requests the application of suitable degradation processes. Regarding th...
Article
The release of antibiotics in aquatic ecosystems from the effluents of wastewater treatment plants (WTPs) is of great concern due to possible chronic toxic effects as well as contribution to antibiotic resistance spread. In the present work, the degradation of the antibiotic chloramphenicol (CAP) by ultraviolet (UV)/peracetic acid (PAA) (an advance...
Article
Research on photo-based technologies has increased in the recent years and the use of UV irradiation, alone or coupled to other techniques, has been regarded as a realistic treatment alternative due to its proven potential in the environmental clean-up of a wide range of pollutants. This review presents a critical assessment of the state and qualit...
Article
The current need for effective regeneration processes to be used in valorization of spent adsorbent demands the research of novel alternative techniques such as application of Advances Oxidation Processes. In this sense, the recent application of electroradical (ER) processes turned out to be very promising in terms of the drugs degradation from di...
Article
In the present study, the degradation of ionic liquid 1-butyl-1-methylpyrrolidinium chloride has been carried out through sulfate radicals. These radicals were generated by different methods of activation of the commercial peroxymonosulfate (PMS) formulation, Oxone®. Among them, the electro-assisted activation in presence of iron provided the best...
Article
Personal care products are known as endocrine-disrupting compounds and their degradation is a matter of concern to avoid their release into the environment. For this reason, the main objective of this study is to develop an effective advanced oxidation process able to degrade a paraben as methyl paraben (MePa). Initially, the efficiency of two elec...
Article
In this work, an eco-friendly solution for the remediation of wastewater generated in the lignin recovery process from eco-industrial paper mill has been proposed in their way towards a more circular economy strategy. Thus, the application of the electro-Fenton process for the degradation of the non-recovered lignin and other organic compounds form...
Article
The aim of this study was to develop a comprehensive strategy for the degradation of a pharmaceutical compound, i.e., diclofenac (DCF), in which the solubility is strongly related to the solution pH. Therefore, in this study, alternative treatments according to DCF concentration ranges were developed. Working at the concentration of 7.5 mg/L and pH...