J. A. Herrera Melián

J. A. Herrera Melián
Universidad de Las Palmas de Gran Canaria | ULPGC · Department of Chemistry

About

111
Publications
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2,684
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September 1992 - present
Universidad de Las Palmas de Gran Canaria
Position
  • Professor

Publications

Publications (111)
Article
Full-text available
Nowadays, activities associated with industries, cities, and leisure generate a number of different wastes, including many chemical pollutants that enter the environment and negatively affect the wildlife. Some of them are emerging organic contaminants (EOCs), which include UV filters and stabilizers, antineoplastic agents, and natural and syntheti...
Article
Full-text available
In this study, pilot-scale hybrid constructed wetlands (CWs) and multistage horizontal subsurface flow CWs (HF CWs) have been studied and compared for the treatment of raw urban wastewater. In the hybrid CWs, the first stage was a mulch-based horizontal subsurface flow CW and the second stage was a vertical subsurface flow CW (VF CW). The VF CWs we...
Article
Full-text available
An important part of the environmental degradation suffered by the planet is caused by the discharge of untreated or poorly treated wastewater. Industrial, urban, and agricultural wastewater contain many different types of pollutants such as biodegradable and nonbiodegradable organic matter, suspended solids, turbidity, nutrients, heavy metals, pes...
Article
Pharmaceuticals and personal care products (PPCPs) constitute a group of chemicals of concern because of their potential toxicity when reaching aquatic environments. Wastewaters are one of the main pathways of introduction into the environment of the chemical compounds used in PPCPs because, in most cases, wastewater treatment facilities are not 10...
Article
Mercury and chromium represent two important elements for their environmental concern and strong impact on human health. Several technologies are available to clean up the environment from these kinds of contaminants, but most of them are costly and difficult to use to get optimum results. Currently, phytoextraction is an effective and affordable t...
Article
Full-text available
In this study, the effects of plants on the performance and bacterial community structure of palm mulch-based vertical flow constructed wetlands was studied. The wetlands were built in August 2013; one of them was planted with Canna indica and Xanthosoma sp., and the other one was not planted and used as a control. The experimental period started i...
Article
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This study aims to examine the impact of public-private partnerships (PPP) investment in energy, technological innovations (TI), economic growth (EG), exports, and foreign direct investment (FDI) on CO2 emissions in Brazil over the period from 1984 to 2018. In doing so, we employ the Ng-Perron unit root test to examine the stationarity and autoregr...
Article
Full-text available
A hybrid constructed wetland mesocosm has been used for the treatment of raw urban wastewater. The first stage was a mulch-based, subsurface, horizontal flow constructed wetland (HF). The HF achieved good removals of COD (61%; 54 g/m²·day) and Total Suspended Solids (84%; 29 g/m²·day). The second stage was composed of vertical flow constructed wetl...
Conference Paper
A real sample from a local printing industry was used as a model. The effect of pH on decantation was determined. Then the concentration of Fe2+ ions and H2O2 and reaction time was studied for Fenton, photo-Fenton and thermo-Fenton. Finally, the effect of the biofilter substrate (sand, zeolite, Canarian palm mulch and balsa mulch) were compared.
Article
The performance and economic cost of the removal of phenol with TiO2-photocatalysis, photo-Fenton, biological aerated filter (BAF) and constructed wetland (CW) reactors has been studied. The BAF achieved complete removal with a phenol loading rate (LR) of 1.44 g·L-1·d-1. The BAF-CW combination provided a phenol-free effluent with a LR for the BAF o...
Article
Full-text available
The treatment of groundwater contaminated with gasoline and diesel with H2O2, H2O2 + UV, Fenton, and photo-Fenton was studied. Fenton reactions provided the best results with 1 mM of Fe2+ and 200 mM of H2O2. High contaminant removals were achieved, in particular those of COD (Fenton: 69%, photo-Fenton: 97%), Diesel Range Organics (99.9% both reacti...
Article
Full-text available
Fenton and photo-Fenton processes were tested for the treatment of wastewater from a local textile industry in Ecuador. The goal of this research was to obtain an efficient, easy-to-apply method for the removal of colour, organic compounds, biodegradability, resistant pollutants, and toxicity according to the Vibrio fischeri bioluminescence test. T...
Article
In this work we present the results of the application of photocatalytic techniques to organic pollutants in water. Such aqueous wastes are produced during the UV–Vis spectrophotometric determination of the NH 4 + ion in water. Processes taking place during the photocatalytic degradation of such organics have been studied by using FTIR, HLPC and TO...
Conference Paper
Full-text available
Este trabajo recoge la experiencia de cinco años de su autor en la combinación de distintos métodos y recursos pedagógicos para fomentar el aprendizaje activo por parte del alumnado. El Método Expositivo es el empleado mayoritariamente en docencia, y tiene una serie de ventajas que no se pueden desdeñar. Sin embargo, este método fomenta una actitud...
Article
Full-text available
A laboratory-scale, intermittently fed, organic-based vertical flow filter was tested as a pre-treatment of high-strength urban wastewater to reduce the risk of clogging in treatment wetlands. At an average hydraulic loading rate of 815 L/m2 day and average surface loading rates of biological oxygen demand of 458 g/m2 day, chemical oxygen demand of...
Article
A Ti–H2O2–phenol complex, not described until now, has been identified on the surface of Degussa P-25 and the new catalyst ECT-1023. This complex is considered to be responsible for the higher hydroquinone to catechol concentration ratio. It has been also shown that phenolates identified on the surface modify electrodonation that controls the gener...
Article
The photocatalytic degradation of the commercial dye Lanaset Sun Yellow 180 was studied in the presence and absence of the different additives used in the dye's formulation. The experiments were performed with Degussa P25 as received and doped with Fe (Fe-TiO(2)) and a new catalyst synthesized by our research group (ECT-1023). The best efficiency w...
Article
Full-text available
The degradation and detoxification towards the duckweed Lemna minor of 4-nitrophenol (4NP) was studied by means of bench-scale constructed wetlands (CWs), TiO(2)-photocatalysis and Fenton + photoFenton reactions. The main goal of this work was to compare the three treatment techniques to evaluate their possible combination for the efficient, low co...
Article
The degradation by Fenton and photo-Fenton of high concentrations of ethylene glycol (1000–25,000 mg/L), similar to those found in wastewater has been studied. Strongly exothermic reactions led to temperature increments up to 70–94 °C. In most experiments, temperature increments favored radical formation that provided almost complete mineralization...
Chapter
The performance of a demonstration natural wastewater treatment system composed of a facultative pond and a horizontal flow constructed wetland (CW) treating raw wastewater from a University Campus has been studied for 5 years. The system achieved high removals for BOD (94 %), COD (78 %), TOC (72 %), suspended solids (96 %) and turbidity (85 %). El...
Article
Full-text available
The performance of two substrates commonly available in the zone, gravel and lapilli, was tested for their use in hybrid constructed wetland pilot plants for the treatment and reuse of urban wastewater in Gran Canaria, Canary Islands, Spain. The first stage of the systems was a vertical subsurface-flow constructed wetland and the second stage was a...
Article
The effect of the mixing ZnO with different portions of activated carbon (AC) has been studied. The resulting catalysts were characterised and evaluated in the photocatalytic decomposition of aqueous pollutants. Changes in the catalyst colour and in the FTIR vibration bands of the surface hydroxyl groups were recorded. νOH vibrations were shifted t...
Article
Dissolved biochemical demand (BOD), total organic carbon (TOC) and NH(4)-N were analysed in seven sampling points in a pond-wetland system treating raw wastewater from 200 1 to 2005 to determine the efficiency of its constructive elements. The wetland consists of horizontal flow stone filters, free water wetlands and a final subsurface flow wetland...
Article
Dissolved biochemical demand (BOD), total organic carbon (TOC) and NH4-N were analysed in seven sampling points in a pond–wetland system treating raw wastewater from 2001 to 2005 to determine the efficiency of its constructive elements. The wetland consists of horizontal flow stone filters, free water wetlands and a final subsurface flow wetland. E...
Article
Formalin wastewater containing high concentrations of formaldehyde and TOC was treated and detoxified with biological aerated filter (BAF) and wetland reactors. At similar formaldehyde loading rates (about 0.01-0.9 kg/m3 d) both reactors provided high efficiencies but the BAF was more efficient at treating formaldehyde and TOC with average eliminat...
Article
The photocatalytic degradation of an endocrine disruptor (resorcinol) and of two fungicides (pyrimethanil and triadimenol) has been studied and compared. The effect of pH, oxygen, and H(2)O(2) on the photocatalytic degradation of these compounds has been established. The three organics were analyzed by means of high pressure liquid chromatography (...
Article
Phenol and phenol compounds are toxic organics that can be found in many industrial wastewaters. Biological wastewater treatments are considered to be the most convenient methods owing to their efficiency and low economic cost. Nonetheless, many organic pollutants are refractory to bacterial degradation. Photocatalytic methods can be an interesting...
Article
The photocatalytic degradation of phthalic acid (H2Ph) with TiO2 (Degussa P-25) and Zno (Aldrich) at different pHs and substrate concentrations (10-150 ppm) has been studied. The concentration and mineralization of H2Ph has been monitored. Results in optimal conditions are: ko = 6.63·10−4 s−1, %TOC = 86.02 for TiO2 and ko = 12.7·10−4 s−1, %TOC=81.9...
Article
In the present work the photocatalytic and biological degradation of two commercial mixtures of pesticides (Folimat and Ronstar) and two fungicides (pyrimethanil and triadimenol) has been studied. The evolution of some components of these commercial products (dicofol, tetradifon and oxadiazon) and that of the two fungicides has been monitored by me...
Article
Full-text available
The photocatalytic degradation of phthalic acid (H2Ph) with TiO2 (Degussa P-25) and ZnO (Aldrich) at different pHs and substrate concentrations (10-150 ppm) has been studied. The concentration and mineralization of H2Ph has been monitored. Results in optimal conditions are: ko = 6.63 · 10⁻⁴ s⁻¹, %TOC = 86.02 for TiO2 and ko = 12.7 · 10⁻⁴ s⁻¹, %TOC...
Article
The photocatalytic techniques have been widely applied to the treatment of wastewaters. However, this work introduces an innovative application of photocatalysis to the treatment in continuous of gaseous contaminants. Packed reactors with different lengths and a spiral one have been designed to study the photocatalytic degradation of methyl tert-bu...
Article
Formalin wastewater containing high concentrations of formaldehyde and TOC was treated and detoxified with biological aerated filter (BAF) and wetland reactors. At similar formaldehyde loading rates (about 0.01–0.9kg/m3d) both reactors provided high efficiencies but the BAF was more efficient at treating formaldehyde and TOC with average eliminatio...
Article
The effect of the presence of formic, oxalic and acetic acids on photocatalytic degradation of p-nitrophenol has been studied. Adsorption and FTIR studies indicated that the presence of such acids modifies p-nitrophenol interaction with TiO2 surface, which is more rapidly degraded. The higher degradation rate constants have been correlated with int...
Article
The kinetics and adsorption aspects of the photocatalytic degradation of three cresolic isomers were studied in aqueous suspension containing TiO2 (Degussa P-25). The Langmuir–Hinshelwood model (L–H) was applied to the kinetic results. Degradation kinetic constants were similar for the three compounds (o-cresol, 0.0188 ppm/s; m-cresol, 0.0166 ppm/s...
Article
The photocatalytic features of TiO2 doped with ferric oxides or mixed with activated carbon (AC-TiO2) are compared with those of the unmodified Degussa P-25 TiO2. These new catalysts show specific structural features that alter catechol and resorcinol photodegradabilities, according to their chemical structures. For instance, we have observed that...
Article
The photocatalytic mineralization of methanol, ethanol and 1-propanol is compared with those of their homologous carboxylic acids (formic, acetic and propanoic). The presence of S2O82− ions almost does not affect the alcohols mineralization. But, those of the acids are slowed down. In addition to this, adding H2O2 inhibits the alcohols mineralizati...
Article
The photocatalytic degradation of catechol and resorcinol with TiO2 in presence of acetic acid has been studied. Low concentrations of the acid (30-50 ppm) can modify the adsorption and degradation of the dihydroxybenzenes. However, the acetic acid concentration threshold at which effects are observed depends on the compound. FTIR analyses have sho...
Article
Propan-1-ol and butan-1-ol photo-degradation with TiO2 (bare-TiO2) and TiO2 doped with Pd or Cu has been studied in a gaseous continuous flow system. Exhaust gases have been analysed by means of GC and FTIR. During propan-1-ol and butan-1-ol degradations, catalysts were not deactivated. Nevertheless, important differences in concentrations and dist...
Article
The voltammetric determination of trace metals in seawater suffers from the interference of dissolved oxygen and engine vibrations onboard ship. It is here attempted to overcome these interferences using a high-frequency (1 to 20 kHz) staircase modulation during the voltammetric scan (high-performance adsorptive cathodic stripping voltammetry, HPAC...
Article
The photocatalytic degradation of three dihydroxybenzenes (hydroquinone, catechol and resorcinol) by TiO2 and Cu-TiO2 has been studied. Degradation rates depend on the molecule catalyst surface interaction type. FTIR studies have shown that Cu presence modifies the organics interactions with the catalysts surface. Therefore, catalysts have shown di...
Article
Full-text available
Aqueous p-nitrophenol solutions are not as hazardous as the solid compound.
Article
Full-text available
In this study the different processes occurring on the TiO2 and Pd and Cu doped TiO2 surfaces during the photocatalytic formic acid degradation in the presence or absence of S2O82− or H2O2 have been investigated. FTIR studies have shown the relevance of the H-bounded hydroxyl groups. It has been observed that formate molecules interact simultaneous...
Article
In this study the different processes occurring on the TiO2 and Pd and Cu doped TiO2 surfaces during the photocatalytic formic acid degradation in the presence or absence of S2O82− or H2O2 have been investigated. FTIR studies have shown the relevance of the H-bounded hydroxyl groups. It has been observed that formate molecules interact simultaneous...
Article
Full-text available
In this paper the degradation of gaseous alcohols (methanol, ethanol, 1-propanol and 1-butanol) has been studied in a continuous reaction system. Methanol and ethanol, but not 1-propanol and 1-butanol, have caused the catalyst bare-TiO2 to become deactivated. The catalyst containing activated carbon, AC-TiO2, has not shown almost deactivation in an...
Article
Ethanol degradation by TiO2 and TiO2 doped with Fe, Pd and Cu has undergone FTIR spectroscopic study. Ethanol interaction with bare-TiO2 and Fe-TiO2 yields the formation of ethoxides on the catalyst surface that can readily be oxidised to acetates by radicals O2− and OH. Conversely, ethanol interaction with Pd-TiO2 and Cu-TiO2 generates an intermed...
Article
The photocatalytic destruction of methanol, formaline (mixture of formaldehyde, methanol and water) and formaline wastes from the preservation of vertinarian physiologic samples has been attempted by two different processes, at high concentrations of reagents and by dossification of reagents, varying pH in both. Experiment evolution has been monito...
Article
In the present work, the effect of mixing TiO2 with different portions of activated carbon (AC) has been studied. Transmission electron microscopy (TEM), scanning electron micrograph (SEM), laser scattering, FTIR and UV spectrophotometric analysis have shown changes of some of the TiO2 physico-chemical characteristics in catalysts containing an AC...
Article
It has been demonstrated that the modification of the TiO2 acid–base properties by the presence of activated carbon (AC) considerably modify the interaction of some molecules with the catalyst surface and hence its photocatalytic characteristics.FTIR studies have shown that while phenol interacts with TiO2 yielding a phenoxide, in the catalyst low...
Article
Different methods such as KMnO4 oxidation, TiO2-photocatalysis and photo-Fenton reaction have been employed for the degradation of wastes from the spectrophotometric determination of in seawater. The optimisation of the degradation process was determined by total organic carbon (TOC) measurements. Experimental parameters such as pH, TiO2, H2O2, Fe3...
Article
The photocatalytic degradation of organic carboxylic acids by Fe-doped TiO2 has been studied. Results indicate that Fe is extracted by means of the formation of a [Fe-carboxylic acid]n+ complex by which the organic molecule is degraded. Fe2+ ions that remain in solution after the degradation go back to the catalyst surface due to their reaction wit...
Article
In the present work, the effect of mixing TiO2 with different portions of activated carbon (AC) has been studied. Transmission electron microscopy (TEM), scanning electron micrograph (SEM), laser scattering, FTIR and UV spectrophotometric analysis have shown changes of some of the TiO2 physico-chemical characteristics in catalysts containing an AC...
Article
Different methods such as KMnO4 oxidation, TiO2-photocatalysis and photo-Fenton reaction have been employed for the degradation of wastes from the spectrophotometric determination of in seawater. The optimisation of the degradation process was determined by total organic carbon (TOC) measurements. Experimental parameters such as pH, TiO2, H2O2, Fe...
Article
Solar TiO2-photocatalysis was applied to waters from a natural wastewater treatment plant located in the Universidad de Las Palmas de Gran Canaria. Degussa P-25 TiO2 and its mixture with activated carbon (AC–TiO2) were used as catalysts. The presence of ozone and certain ions such as phosphates on the photocatalytic degradation of organic matter wa...