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  1. Article ; Online: Photocatalytic degradation of phenol under visible light irradiation by using ferrous oxalate synthesized from iron-rich mineral sands via a green hydrothermal route

    Galeas, Salomé / Valdivieso-Ramírez, Carla S. / Pontón, Patricia I. / Guerrero, Victor H. / Goetz, Vincent

    Environmental Technology & Innovation. 2023 Nov., v. 32 p.103325-

    2023  

    Abstract: The development of efficient green-photocatalysts represents a promising alternative for eliminating organic contaminants found in water. In this work, the photocatalyst α-ferrous oxalate dihydrate (α-FOD) was synthesized using Ecuadorian black sands as ... ...

    Abstract The development of efficient green-photocatalysts represents a promising alternative for eliminating organic contaminants found in water. In this work, the photocatalyst α-ferrous oxalate dihydrate (α-FOD) was synthesized using Ecuadorian black sands as an iron-rich precursor and was further used for phenol degradation for the first time. The synthesis was performed under hydrothermal conditions using aqueous oxalic acid at 135 °C and reaction times of 4 and 12 h. Also, ethanol and ethylene glycol were evaluated as co-solvents in the synthesis reaction. The characterization performed showed that synthesized photocatalysts were mainly composed of monoclinic FOD (crystallinity indexes between 75 and 87%) in the form of mesoporous particles with specific surface areas between 19.6 and 46.1 m²/g. The optical band gap energy was estimated in the range of 2.31–2.49 eV, which demonstrated visible light response. Indeed, under visible light irradiation, the photocatalytic activity of synthesized materials showed over 92% phenol removal within a short time (6 h) with a photocatalyst dose of 0.5 g/L. Also, stability and reusability of photocatalyst upon visible light was demonstrated. These results suggest that the photoactive green materials synthesized herein from a low-cost precursor can be used for degradation of organic contaminants under solar light irradiation.
    Keywords crystal structure ; energy ; environmental technology ; ethanol ; ethylene glycol ; irradiation ; light ; oxalates ; oxalic acid ; phenol ; photocatalysis ; photocatalysts ; porous media ; solar radiation ; Organic pollutant ; Heterogeneous photocatalysis ; Visible irradiation ; Low-cost precursor ; Wastewater treatment
    Language English
    Dates of publication 2023-11
    Publishing place Elsevier B.V.
    Document type Article ; Online
    ISSN 2352-1864
    DOI 10.1016/j.eti.2023.103325
    Database NAL-Catalogue (AGRICOLA)

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  2. Article ; Online: Optimization of Compression and Flexural Properties of Masonry Veneers with Recycled PET-1.

    Paredes, Juan / Castillo, Willan / Salinas, Gabriela / Erazo, Henry / Guerrero, Víctor H

    Polymers

    2023  Volume 15, Issue 5

    Abstract: The study of new materials formulated using recycled polymers offers an ecological and sustainable alternative for the construction industry. In this work, we optimized the mechanical behavior of manufactured masonry veneers made from concrete reinforced ...

    Abstract The study of new materials formulated using recycled polymers offers an ecological and sustainable alternative for the construction industry. In this work, we optimized the mechanical behavior of manufactured masonry veneers made from concrete reinforced with recycled polyethylene terephthalate (PET) from discarded plastic bottles. For this purpose, we used the response surface methodology to evaluate the compression and flexural properties. PET percentage, PET size and aggregate size were used as input factors in a Box-Behnken experimental design resulting in a total of 90 tests. The fraction of the commonly used aggregates replaced by PET particles was 15%, 20% and 25%. The nominal size of the PET particles used was 6, 8 and 14 mm, while the size of the aggregates was 3, 8 and 11 mm. The function of desirability was used to optimize response factorials. The globally optimized formulation contained 15% of 14 mm PET particles in the mixture, and 7.36 mm aggregates, obtaining important mechanical properties of this characterization of masonry veneers. The flexural strength (four-point) was 1.48 MPa, and the compression strength was 3.96 MPa; these values show property improvements of 110% and 94%, respectively, compared to commercial masonry veneers. Overall, this offers the construction industry a robust and environmentally friendly alternative.
    Language English
    Publishing date 2023-02-23
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym15051122
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  3. Article: Magnetite Impregnated Lignocellulosic Biomass for Zn(II) Removal.

    Asimbaya, Christopher / Rosas-Laverde, Nelly Maria / Galeas, Salome / Debut, Alexis / Guerrero, Victor H / Pruna, Alina

    Materials (Basel, Switzerland)

    2022  Volume 15, Issue 3

    Abstract: Magnetic composites obtained by impregnation of lignocellulosic biomass with magnetite nanoparticles were used for zinc(II) removal from aqueous synthetic solutions. Laurel, canelo and eucalyptus sawdust, with a particle size between 74 and 150 µm were ... ...

    Abstract Magnetic composites obtained by impregnation of lignocellulosic biomass with magnetite nanoparticles were used for zinc(II) removal from aqueous synthetic solutions. Laurel, canelo and eucalyptus sawdust, with a particle size between 74 and 150 µm were used as support. Structural and morphological examinations of the composites confirmed the presence of magnetite nanoparticles in the lignocellulosic support. Transmission Electron Microscopy showed nanoparticles with diameters of about 20 nm. The maximum removal efficiencies for 7 g L
    Language English
    Publishing date 2022-01-19
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma15030728
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  4. Article ; Online: Nanofluid Formulations Based on Two-Dimensional Nanoparticles, Their Performance, and Potential Application as Water-Based Drilling Fluids.

    Zamora-Ledezma, Camilo / Narváez-Muñoz, Christian / Guerrero, Víctor H / Medina, Ernesto / Meseguer-Olmo, Luis

    ACS omega

    2022  Volume 7, Issue 24, Page(s) 20457–20476

    Abstract: The development of sustainable, cost-efficient, and high-performance nanofluids is one of the current research topics within drilling applications. The inclusion of tailorable nanoparticles offers the possibility of formulating water-based fluids with ... ...

    Abstract The development of sustainable, cost-efficient, and high-performance nanofluids is one of the current research topics within drilling applications. The inclusion of tailorable nanoparticles offers the possibility of formulating water-based fluids with enhanced properties, providing unprecedented opportunities in the energy, oil, gas, water, or infrastructure industries. In this work, the most recent and relevant findings related with the development of customizable nanofluids are discussed, focusing on those based on the incorporation of 2D (two-dimensional) nanoparticles and environmentally friendly precursors. The advantages and drawbacks of using 2D layered nanomaterials including but not limited to silicon nano-glass flakes, graphene, MoS
    Language English
    Publishing date 2022-06-08
    Publishing country United States
    Document type Journal Article ; Review
    ISSN 2470-1343
    ISSN (online) 2470-1343
    DOI 10.1021/acsomega.2c02082
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Dataset on the mechanical and physical characterization of the Ecuadorian

    Padilla, José / Guachamín-Acero, Wilson / Guerrero, Víctor H / Monar, Willan / Pontón, Patricia I / Guamán, Marco V

    Data in brief

    2023  Volume 52, Page(s) 109969

    Abstract: This article presents a set of experimental data on the mechanical and physical properties of the Ecuadorian endemic bamboo ... ...

    Abstract This article presents a set of experimental data on the mechanical and physical properties of the Ecuadorian endemic bamboo species
    Language English
    Publishing date 2023-12-16
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2786545-9
    ISSN 2352-3409 ; 2352-3409
    ISSN (online) 2352-3409
    ISSN 2352-3409
    DOI 10.1016/j.dib.2023.109969
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  6. Article: One-Pot Biosynthesis of Maghemite (γ-Fe2O3) Nanoparticles in Aqueous Extract of Ficus carica Fruit and Their Application for Antioxidant and 4-Nitrophenol Reduction

    Kumar, Brajesh / Smita, Kumari / Galeas, Salome / Guerrero, Victor H / Debut, Alexis / Cumbal, Luis

    Waste and biomass valorization. 2021 July, v. 12, no. 7

    2021  

    Abstract: Nowadays, iron oxide based nanomaterials are well known for their multifunctional properties and their applications in various fields. In this article, a simple, one pot and green method for the biosynthesis of single phase maghemite (γ-Fe₂O₃) ... ...

    Abstract Nowadays, iron oxide based nanomaterials are well known for their multifunctional properties and their applications in various fields. In this article, a simple, one pot and green method for the biosynthesis of single phase maghemite (γ-Fe₂O₃) nanoparticles using an aqueous fruit extract of Ficus carica were reported. A detailed spectroscopic and microscopic analysis based on UV–Vis, XRD, FTIR, TGA, DLS, TEM and SAED were used to establish the optical property, morphology, composition, purity, nature and other properties of the synthesized γ-Fe₂O₃ NPs. UV–Vis, FTIR and TGA analysis indicated the involvement of phytochemicals of Ficus carica fruits in nanoparticle synthesis and direct functionalization of nanoparticle surfaces. XRD pattern confirmed the purity and nature of well-crystallized γ-Fe₂O₃ NPs. DLS showed the average hydrodynamic size of γ-Fe₂O₃ NPs while, TEM micrographs confirmed the formation of spherical and 4–6 nm sized γ-Fe₂O₃ NPs. In addition, the γ-Fe₂O₃ NPs showed (a) free radical scavenging activity against DPPH and (b) catalytic activity for the reduction of 4-Nitrophenol in the presence of NaBH₄. This biosynthetic method provided an advantageous pathway to fabricate bulk quantities of γ-Fe₂O₃ NPs and maybe extend their applications in different biotechnological applications.
    Keywords Ficus carica ; biomass ; biosynthesis ; catalytic activity ; free radicals ; fruit extracts ; fruits ; hydrodynamics ; maghemite ; p-nitrophenol ; phytochemicals ; wastes
    Language English
    Dates of publication 2021-07
    Size p. 3575-3587.
    Publishing place Springer Netherlands
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 2541900-6
    ISSN 1877-265X ; 1877-2641
    ISSN (online) 1877-265X
    ISSN 1877-2641
    DOI 10.1007/s12649-020-01279-9
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Acid activation of bentonite clay for recycled automotive oil purification

    Aguilar Johanna / Almeida-Naranjo Cristina / Aldás María B. / Guerrero Víctor H.

    E3S Web of Conferences, Vol 191, p

    2020  Volume 03002

    Abstract: The search for inexpensive and environmentally friendly alternatives for used motor oil (UMO) purification has become a topic of research. In this study, the use of bentonite clay modified by acid activation is proposed. Sulfuric acid, acetic acid (v- ... ...

    Abstract The search for inexpensive and environmentally friendly alternatives for used motor oil (UMO) purification has become a topic of research. In this study, the use of bentonite clay modified by acid activation is proposed. Sulfuric acid, acetic acid (v-acid/w-clay ratio=20, 40 and 60%) and sulfuric/acetic mixtures (1:1 ratio) were used in the bentonite clay activation. The activated clays were used in the UMO treatment in a ratio of 1:4 w/v, using batch adsorption processes (contact time=12 min). To determine the structural and morphological modifications produced by the acid activation process, the clays were characterized by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. The oil clarification efficiency was quantified by UV-Vis spectroscopy, acidity, alkalinity and viscosity index. It was determined that sulfuric acid and the sulfuric/acetic activations presented a similar bentonite structure transformation, which appears in the cations leaching of intermediate layer. The treated oil with the highest clarifications (with respect to UMO) were the ones treated using bentonite activated with sulfuric acid 40 v/w% and sulfuric/acetic acid (1:1 ratio) with clarifications of 70 and 68%, respectively. The oil treated with clay activated with sulfuric acid (40%) reduced its viscosity, acidity and alkalinity by 23%, 80% and 29%, respectively.
    Keywords Environmental sciences ; GE1-350
    Subject code 660
    Language English
    Publishing date 2020-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article: Heliconia stricta Huber Behavior on Hybrid Constructed Wetlands Fed with Synthetic Domestic Wastewater

    Almeida-Naranjo, Cristina E / Guachamín, Gabriela / Guerrero, Víctor H / Villamar, Cristina-Alejandra

    Water. 2020 May 13, v. 12, no. 5

    2020  

    Abstract: Constructed wetlands (CWs) represent a highly efficient, eco-friendly and economic alternative for wastewater treatment in decentralized contexts. The adequate selection of the plants used in CWs plays a decisive role in the successful implementation and ...

    Abstract Constructed wetlands (CWs) represent a highly efficient, eco-friendly and economic alternative for wastewater treatment in decentralized contexts. The adequate selection of the plants used in CWs plays a decisive role in the successful implementation and operation of this technology type. In this work, we studied the behavior of a native tropical plant (Heliconia stricta Huber) for the removal of organic matter and nutrients within a hybrid CW system fed with synthetic domestic wastewater. This hybrid system was composed of two wetlands, a vertical surface flow (VSF-CW) and a horizontal subsurface flow (HSSF-CW), connected in series and being operated with nominal hydraulic loading rates of 12 and 9 mm day⁻¹, respectively. Results evidenced nitrification (nitrite concentration increased up to three times) but not denitrification because nitrate concentration increased in the final effluent. The average removal efficiencies were 86.8%, 96.4%, and 57.0%, for COD, NH₄⁺ and PO₄³⁻, respectively. On the other hand, the apical height, basal diameter, leaf length and width increased in relation to initial measurements (between 0.6–7.1%) in plants of both CWs, which demonstrated the ability of the plants to adapt to the operating conditions of the system. This promising performance observed when using Heliconia stricta Huber opens the need for further research and could be particularly interesting in CWs used in tropical areas.
    Keywords Heliconia ; ammonium ; chemical oxygen demand ; constructed wetlands ; denitrification ; leaf length ; leaf width ; municipal wastewater ; nitrates ; nitrification ; nitrites ; organic matter ; overland flow ; phosphates ; phytoremediation ; plant adaptation ; subsurface flow ; tropical plants ; wastewater treatment
    Language English
    Dates of publication 2020-0513
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    Note golden set
    ZDB-ID 2521238-2
    ISSN 2073-4441
    ISSN 2073-4441
    DOI 10.3390/w12051373
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: Analytical Pyrolysis of

    Venegas-Vásconez, Diego / Arteaga-Pérez, Luis E / Aguayo, María Graciela / Romero-Carrillo, Romina / Guerrero, Víctor H / Tipanluisa-Sarchi, Luis / Alejandro-Martín, Serguei

    Polymers

    2023  Volume 15, Issue 18

    Abstract: ... Pinus ... ...

    Abstract Pinus radiata
    Language English
    Publishing date 2023-09-17
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym15183790
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  10. Article ; Online: Persistent organic pollutants: The trade-off between potential risks and sustainable remediation methods.

    Negrete-Bolagay, Daniela / Zamora-Ledezma, Camilo / Chuya-Sumba, Cristina / De Sousa, Frederico B / Whitehead, Daniel / Alexis, Frank / Guerrero, Victor H

    Journal of environmental management

    2021  Volume 300, Page(s) 113737

    Abstract: Persistent Organic Pollutants (POPs) have become a very serious issue for the environment because of their toxicity, resistance to conventional degradation mechanisms, and capacity to bioconcentrate, bioaccumulate and biomagnify. In this review article, ... ...

    Abstract Persistent Organic Pollutants (POPs) have become a very serious issue for the environment because of their toxicity, resistance to conventional degradation mechanisms, and capacity to bioconcentrate, bioaccumulate and biomagnify. In this review article, the safety, regulatory, and remediation aspects of POPs including aromatic, chlorinated, pesticides, brominated, and fluorinated compounds, are discussed. Industrial and agricultural activities are identified as the main sources of these harmful chemicals, which are released to air, soil and water, impacting on social and economic development of society at a global scale. The main types of POPs are presented, illustrating their effects on wildlife and human beings, as well as the ways in which they contaminate the food chain. Some of the most promising and innovative technologies developed for the removal of POPs from water are discussed, contrasting their advantages and disadvantages with those of more conventional treatment processes. The promising methods presented in this work include bioremediation, advanced oxidation, ionizing radiation, and nanotechnology. Finally, some alternatives to define more efficient approaches to overcome the impacts that POPs cause in the hydric sources are pointed out. These alternatives include the formulation of policies, regulations and custom-made legislation for controlling the use of these pollutants.
    MeSH term(s) Environmental Pollutants ; Food Chain ; Humans ; Persistent Organic Pollutants ; Pesticides/analysis ; Soil
    Chemical Substances Environmental Pollutants ; Pesticides ; Soil
    Language English
    Publishing date 2021-09-15
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2021.113737
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