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Clay-organic composites have attracted great interest due to their ability to remove various contaminants from wastewater. The surfactants are the most commonly used organic compounds for clay modification. However, cationic surfactants are toxic and can be environmentally hazardous. Ionic liquids are a new promising alternative to the cationic surfactants due to lesser toxicity and appropriate thermal stability. The research aim is to prepare an environmentally friendly new class of clay sorbents modified with ionic liquids for potential applications in wastewater treatment from the textile industry. Imidazolium-based ionic liquids with different lengths of alkyl chains were intercalated in the interlayer space of sodium bentonite via an ion exchange reaction. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric (TG) analysis, and Brunauer-Emmett-Teller (BET) method for the specific surface area (SSA) analysis provided evidence of successful modification of the bentonite. The removal of model organic contaminant, Congo red dye, from aqueous solutions was investigated using the modified clays under different experimental conditions, i.e., reaction time, pH and sorbate concentration. Detailed isotherm studies showed that the modified clays have much higher Congo red sorption capacity compared to unmodified bentonite. The maximum Congo red sorption capacity of 150 mg/g was observed for bentonite modified with 1-dodecyl-3-methylimidazolium chloride (Bent_C12mimCl) with d-value of 17.7 Å. This study shows that ionic liquids enhance bentonite capacity for Congo red sorption with different trends based on the ionic liquid structure. Bentonite-ionic liquid composites are eco-friendly and effective sorbents and due to a substantial increase in their capacity for the removal of textile dyes, they are expected to diminish the environmental impact of industrially used dyes.
Ruta Ozola-Davidane; Juris Burlakovs; Toomas Tamm; Sindija Zeltkalne; Andrey E. Krauklis; Maris Klavins. Bentonite-ionic liquid composites for Congo red removal from aqueous solutions. Journal of Molecular Liquids 2021, 337, 116373 .
AMA StyleRuta Ozola-Davidane, Juris Burlakovs, Toomas Tamm, Sindija Zeltkalne, Andrey E. Krauklis, Maris Klavins. Bentonite-ionic liquid composites for Congo red removal from aqueous solutions. Journal of Molecular Liquids. 2021; 337 ():116373.
Chicago/Turabian StyleRuta Ozola-Davidane; Juris Burlakovs; Toomas Tamm; Sindija Zeltkalne; Andrey E. Krauklis; Maris Klavins. 2021. "Bentonite-ionic liquid composites for Congo red removal from aqueous solutions." Journal of Molecular Liquids 337, no. : 116373.
Vaira Obuka; Maris Sinka; Vizma Nikolajeva; Solvita Kostjukova; Ruta Ozola-Davidane; Maris Klavins. Microbiological Stability of Bio-Based Building Materials. Journal of Ecological Engineering 2021, 22, 296 -313.
AMA StyleVaira Obuka, Maris Sinka, Vizma Nikolajeva, Solvita Kostjukova, Ruta Ozola-Davidane, Maris Klavins. Microbiological Stability of Bio-Based Building Materials. Journal of Ecological Engineering. 2021; 22 (4):296-313.
Chicago/Turabian StyleVaira Obuka; Maris Sinka; Vizma Nikolajeva; Solvita Kostjukova; Ruta Ozola-Davidane; Maris Klavins. 2021. "Microbiological Stability of Bio-Based Building Materials." Journal of Ecological Engineering 22, no. 4: 296-313.
Soil and groundwater as the leachate may contaminate surrounding watersheds, thus different pollutants from closed dumps and landfills pose significant risks to human health and ecology. Pollution may lead to soil and water degradation however it might be diminished through sustainable dump site closure projects and processual management. Several decades of clays and clay minerals studies lead to modified clay composites concept that is one of the potential promising solutions for building the landfill covering material and serve as capping biocover layer at the same time. As humic substances are constituents of soil organic matter, pollutants can be sorbed on the surfaces of complex molecules. This kind of humic acid-clay mineral composite materials thus might become as low cost building material component - covering material. Construction of such layer are to be performed as a combination of clay-humic composites and landfill mined fine fraction of waste with small amendment of natural soil. Several hypotheses that are already proven has to be mentioned: a) Clay minerals produce composites with humic substances; 2) Clay-humic complexes reduce through sorption both organic and inorganic pollutants; 3) Low risk of toxic byproducts from landfill mined waste fine fraction can be the problem; 4) Such composites mostly would trap toxic contaminants (e.g., pharmaceuticals) found in reworked fine fraction of waste. The aim of the work is to provide alternative solution for landfill closure by giving theoretical considerations from multidisciplinary knowledge of environmental engineering, chemistry and waste management.
Juris Burlakovs; University of Latvia; Jovita Pilecka; Inga Grinfelde; Ruta Ozola-Davidane; Latvia University of Life Sciences and Technologies. Clay minerals and humic substances as landfill closure covering material constituents: first studies. Research for Rural Development 2020 : annual 26th International scientific conference proceedings 2020, 1 .
AMA StyleJuris Burlakovs, University of Latvia, Jovita Pilecka, Inga Grinfelde, Ruta Ozola-Davidane, Latvia University of Life Sciences and Technologies. Clay minerals and humic substances as landfill closure covering material constituents: first studies. Research for Rural Development 2020 : annual 26th International scientific conference proceedings. 2020; ():1.
Chicago/Turabian StyleJuris Burlakovs; University of Latvia; Jovita Pilecka; Inga Grinfelde; Ruta Ozola-Davidane; Latvia University of Life Sciences and Technologies. 2020. "Clay minerals and humic substances as landfill closure covering material constituents: first studies." Research for Rural Development 2020 : annual 26th International scientific conference proceedings , no. : 1.
Industrial and strategic significance of platinum group elements (PGEs)—Os, Ir, Ru, Rh, Pd, Pt—makes them irreplaceable; furthermore, some PGEs are used by investors as “safe heaven” assets traded in the commodity markets. This review analyzes PGEs from various aspects: their place in the geosphere, destiny in the anthroposphere, and opportunity in the economy considering interactions among the exploration, recycling of urban ores, trade markets, speculative rhetoric, and changes required for successful technological progress towards the implementation of sustainability. The global market of PGEs is driven by several concerns: costs for extraction/recycling; logistics; the demand of industries; policies of waste management. Diversity of application and specific chemical properties, as well as improper waste management, make the recycling of PGEs complicated. The processing approach depends on composition and the amount of available waste material, and so therefore urban ores are a significant source of PGEs, especially when the supply of elements is limited by geopolitical or market tensions. Recycling potential of urban ores is particularly important in a long-term view disregarding short-term economic fluctuations, and it should influence investment flows in the advancement of innovation.
Juris Burlakovs; Zane Vincevica-Gaile; Maris Krievans; Yahya Jani; Mika Horttanainen; Kaur-Mikk Pehme; Elina Dace; Roy Hendroko Setyobudi; Jovita Pilecka; Gintaras Denafas; Inga Grinfelde; Amit Bhatnagar; Vasiliy Rud; Vita Rudovica; Ronald L. Mersky; Olga Anne; Mait Kriipsalu; Ruta Ozola-Davidane; Toomas Tamm; Maris Klavins. Platinum Group Elements in Geosphere and Anthroposphere: Interplay among the Global Reserves, Urban Ores, Markets and Circular Economy. Minerals 2020, 10, 558 .
AMA StyleJuris Burlakovs, Zane Vincevica-Gaile, Maris Krievans, Yahya Jani, Mika Horttanainen, Kaur-Mikk Pehme, Elina Dace, Roy Hendroko Setyobudi, Jovita Pilecka, Gintaras Denafas, Inga Grinfelde, Amit Bhatnagar, Vasiliy Rud, Vita Rudovica, Ronald L. Mersky, Olga Anne, Mait Kriipsalu, Ruta Ozola-Davidane, Toomas Tamm, Maris Klavins. Platinum Group Elements in Geosphere and Anthroposphere: Interplay among the Global Reserves, Urban Ores, Markets and Circular Economy. Minerals. 2020; 10 (6):558.
Chicago/Turabian StyleJuris Burlakovs; Zane Vincevica-Gaile; Maris Krievans; Yahya Jani; Mika Horttanainen; Kaur-Mikk Pehme; Elina Dace; Roy Hendroko Setyobudi; Jovita Pilecka; Gintaras Denafas; Inga Grinfelde; Amit Bhatnagar; Vasiliy Rud; Vita Rudovica; Ronald L. Mersky; Olga Anne; Mait Kriipsalu; Ruta Ozola-Davidane; Toomas Tamm; Maris Klavins. 2020. "Platinum Group Elements in Geosphere and Anthroposphere: Interplay among the Global Reserves, Urban Ores, Markets and Circular Economy." Minerals 10, no. 6: 558.
Humic substances are the main component of soil organic matter and they actively interact with substances in soils, including pollutants. Humic acid-clay mineral composite materials can be considered as prospective and low-cost sorbents for contaminant removal. The aim of this study is to develop clay mineral and humic acid composite materials and to characterise their possible applications. For this research, montmorillonite, kaolinite and bentonite were saturated with three types of humic substances: technical humic acid from lignite, humic substances extracted from raised bog peat (Latvia) and technical K humate from lignite. Obtained sorbents were characterized using FTIR. The sorption was characterised according to the chosen clay mineral and humic acid type and concentration. Comparing the influence of clay minerals and humic substances on humic matter sorption, it has been found that the sorbed amount of humic substances depend on chosen humic substances and/or clay mineral. Obtained sorbents were used for sorption of chlorpromazine. Results indicate that the most perspective sorbents for chlorpromazine removal are bentonite and bentonite modified with humic acid. However, montmorillonite-humic composites also can be used for removal of chlorpromazine from water.
Linda Ansone-Bērtiņa; Marta Jemeļjanova; Māris Kļaviņš; Rūta Ozola-Davidāne; Jorens Kviesis. Clay-Humic Substance Composites for Removal of Pharmaceuticals from Water. Key Engineering Materials 2020, 850, 28 -34.
AMA StyleLinda Ansone-Bērtiņa, Marta Jemeļjanova, Māris Kļaviņš, Rūta Ozola-Davidāne, Jorens Kviesis. Clay-Humic Substance Composites for Removal of Pharmaceuticals from Water. Key Engineering Materials. 2020; 850 ():28-34.
Chicago/Turabian StyleLinda Ansone-Bērtiņa; Marta Jemeļjanova; Māris Kļaviņš; Rūta Ozola-Davidāne; Jorens Kviesis. 2020. "Clay-Humic Substance Composites for Removal of Pharmaceuticals from Water." Key Engineering Materials 850, no. : 28-34.
Despite the significant reduction of phosphorus (P) discharge in the Baltic Sea in the last decades, obtained through the implementation of some approaches within the Helsinki Convention, eutrophication is still considered the biggest problem for the Baltic Sea environment. Consequently, the reduction of P load is an urgent need to solve, but the complexity of both the environmental and legislative context of the area makes this process difficult (more than in the past). Eutrophication is an intricate issue requiring a proper framework of governance that is not easy to determine in the Baltic Sea Region where the needs of several different countries converge. To identify the most suitable strategy to reduce the eutrophication in the Baltic Sea, the InPhos project (no. 17022, 2018–2019, funded by the European Institute of Innovation & Technology (EIT) Raw Materials) adopted a holistic approach considering technical, political, economic, environmental and social aspects of P management. With the aims to raise awareness about the P challenge, foster the dialogue among all the stakeholders, and find solutions already developed in other countries (such as Germany and Switzerland) to be transferred in the Baltic Sea Region, the InPhos project consortium applied the methodology proposed in this paper, consisting of three main phases: (i) analysis of the available technologies to remove P from waste streams that contribute to eutrophication; (ii) analysis of the main streams involving P in Baltic Sea countries to highlight the potential of more sustainable and circular P management; (iii) study of the current context (e.g., already-existing initiatives and issues). This approach allowed us to identify four categories of recommendations and practical actions proposed to improve P management in the Baltic Sea region. During the project, the consortium mainly addressed social aspects. Following steps beyond the project will be more quantitative to determine the techno-economic feasibility of circular P management in selected demo cases in the region.
Marzena Smol; Michał Preisner; Augusto Bianchini; Jessica Rossi; Ludwig Hermann; Tanja Schaaf; Jolita Kruopienė; Kastytis Pamakštys; Maris Klavins; Ruta Ozola-Davidane; Daina Kalnina; Elina Strade; Viktoria Voronova; Karin Pachel; Xiaosheng Yang; Britt-Marie Steenari; Magdalena Svanström. Strategies for Sustainable and Circular Management of Phosphorus in the Baltic Sea Region: The Holistic Approach of the InPhos Project. Sustainability 2020, 12, 2567 .
AMA StyleMarzena Smol, Michał Preisner, Augusto Bianchini, Jessica Rossi, Ludwig Hermann, Tanja Schaaf, Jolita Kruopienė, Kastytis Pamakštys, Maris Klavins, Ruta Ozola-Davidane, Daina Kalnina, Elina Strade, Viktoria Voronova, Karin Pachel, Xiaosheng Yang, Britt-Marie Steenari, Magdalena Svanström. Strategies for Sustainable and Circular Management of Phosphorus in the Baltic Sea Region: The Holistic Approach of the InPhos Project. Sustainability. 2020; 12 (6):2567.
Chicago/Turabian StyleMarzena Smol; Michał Preisner; Augusto Bianchini; Jessica Rossi; Ludwig Hermann; Tanja Schaaf; Jolita Kruopienė; Kastytis Pamakštys; Maris Klavins; Ruta Ozola-Davidane; Daina Kalnina; Elina Strade; Viktoria Voronova; Karin Pachel; Xiaosheng Yang; Britt-Marie Steenari; Magdalena Svanström. 2020. "Strategies for Sustainable and Circular Management of Phosphorus in the Baltic Sea Region: The Holistic Approach of the InPhos Project." Sustainability 12, no. 6: 2567.
Organic pollutants are widespread and a known problem for the environment. p-nitrophenol (PNP) is one such pollutant found in effluents from various industries involved with pesticides, pharmaceuticals, petrochemicals, plastic, paper, and other materials. The objective of this research was to prepare and test organically modified clays using four different surfactants and to evaluate the removal efficiency of PNP from aqueous solutions. Organically modified clays have attracted great interest due to their wide applications in industry and environmental protection as sorbents for organic pollutants. Two natural smectite-dominated clay types from outcrops in Latvia and Lithuania as well as industrially manufactured montmorillonite (Mt) clay were modified using different nonionic (4-methylmorpholine N-oxide (NMO) and dimethyldodecylamine N-oxide (DDAO)) and cationic (benzyltrimethyl ammonium chloride (BTMAC) and dodecyltrimethyl ammonium chloride (DTAC)) surfactants. Modified clay materials were characterized by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and the Brunauer-Emmett-Teller method (BET) for surface area analysis. Sorption of PNP was investigated under various conditions, e.g. surfactant loading, initial PNP concentration, contact time, and pH. The novelty of the present study was to prepare innovative organo-sorbents based on manufactured as well as natural clay samples using cationic surfactants and nonconventional nonionic surfactants as modifiers. The sorption data combined with FTIR and XRD supplementary results suggests that nonionic organo-clay (Mt-DDAO_2) is the most effective sorbent and may serve as a low-toxicity immobilizer of pollutants such as phenols.
Ruta Ozola-Davidane; Andrey Krauklis; Juris Burlakovs; Maris Klavins; Zane Vincevica-Gaile; William Hogland. Surfactant-Modified Clay Sorbents for the Removal of p-nitrophenol. Clays and Clay Minerals 2019, 67, 132 -142.
AMA StyleRuta Ozola-Davidane, Andrey Krauklis, Juris Burlakovs, Maris Klavins, Zane Vincevica-Gaile, William Hogland. Surfactant-Modified Clay Sorbents for the Removal of p-nitrophenol. Clays and Clay Minerals. 2019; 67 (2):132-142.
Chicago/Turabian StyleRuta Ozola-Davidane; Andrey Krauklis; Juris Burlakovs; Maris Klavins; Zane Vincevica-Gaile; William Hogland. 2019. "Surfactant-Modified Clay Sorbents for the Removal of p-nitrophenol." Clays and Clay Minerals 67, no. 2: 132-142.
The presence of arsenic (As) in natural and anthropogenic soils causes severe pollution of groundwater due to its harmful carcinogenic effects. The present work describes the research activities for searching of appropriate innovative sorbents based on clay material for As sorption using iron oxy-hydroxide modification. Natural and manufactured clay was chosen for comparison of modification efficiency in order to obtain best sorption results for As(V). The results of pilot testing were obtained and the sorption was studied as a function of initial arsenic concentration. Obtained results indicate that modification of clay with Fe compounds significantly improves the sorption capacity of a newly developed material used for sorption of As(V). Efficiency of sorption for Fe-modified clay is highly dependent on clay type as well as iron content in it. Further perspectives of investigations are recovered during this study in order to create more efficient and relatively cheap sorbents for As removal from aqueous solutions.
Ruta Ozola; Andrejs Krauklis; Martins Leitietis; Juris Burlakovs; Ilze Vircava; Linda Ansone-Bertina; Amit Bhatnagar; Maris Klavins. FeOOH-modified clay sorbents for arsenic removal from aqueous solutions. Environmental Technology & Innovation 2019, 13, 364 -372.
AMA StyleRuta Ozola, Andrejs Krauklis, Martins Leitietis, Juris Burlakovs, Ilze Vircava, Linda Ansone-Bertina, Amit Bhatnagar, Maris Klavins. FeOOH-modified clay sorbents for arsenic removal from aqueous solutions. Environmental Technology & Innovation. 2019; 13 ():364-372.
Chicago/Turabian StyleRuta Ozola; Andrejs Krauklis; Martins Leitietis; Juris Burlakovs; Ilze Vircava; Linda Ansone-Bertina; Amit Bhatnagar; Maris Klavins. 2019. "FeOOH-modified clay sorbents for arsenic removal from aqueous solutions." Environmental Technology & Innovation 13, no. : 364-372.
Ruta Ozola-Davidane. CLAYS, INTERCALATED WITH ORGANIC SUBSTANCES FOR ENVIRONMENTAL TECHNOLOGIES. 18th International Multidisciplinary Scientific GeoConference SGEM2018, Ecology, Economics, Education and Legislation 2018, 1 .
AMA StyleRuta Ozola-Davidane. CLAYS, INTERCALATED WITH ORGANIC SUBSTANCES FOR ENVIRONMENTAL TECHNOLOGIES. 18th International Multidisciplinary Scientific GeoConference SGEM2018, Ecology, Economics, Education and Legislation. 2018; ():1.
Chicago/Turabian StyleRuta Ozola-Davidane. 2018. "CLAYS, INTERCALATED WITH ORGANIC SUBSTANCES FOR ENVIRONMENTAL TECHNOLOGIES." 18th International Multidisciplinary Scientific GeoConference SGEM2018, Ecology, Economics, Education and Legislation , no. : 1.
Existing schemes of solid waste handling have been improved implementing advanced systems for recovery and reuse of various materials. Nowadays, the ‘zero waste’ concept is becoming more topical through the reduction of disposed waste. Recovery of metals, nutrients and other materials that can be returned to the material cycles still remain as a challenge for future. Landfill mining (LFM) is one of the approaches that can deal with former dumpsites, and derived materials may become important for circular economy within the concept ‘beyond the zero waste’. Perspectives of material recovery can include recycling of critical industrial metals, including rare earth elements (REEs). The LFM projects performed in the Baltic Region along with a conventional source separation of iron-scrap, plastics etc. have shown that the potential of fine-grained fractions (including clay and colloidal matter) of excavated waste have considerably large amounts of potentially valuable metals and distinct REEs. In this paper analytical screening studies are discussed extending the understanding of element content in fine fraction of waste derived from excavated, separated and screened waste in a perspective of circular economy. Technological feasibility was evaluated by using modified sequential extraction technique where easy extractable amount of metals can be estimated. Results revealed that considerable concentrations of Mn (418-823 mg/kg), Ni (41-84 mg/kg), Co (10.7-19.3 mg/kg) and Cd (1.0-3.0 mg/kg) were detected in fine fraction (<10 mm) of waste sampled from Högbytorp landfill, while Cr (49-518 mg/kg) and Pb (30-264 mg/kg) were found in fine fraction (<10 mm) of waste from Torma landfill revealing wide heterogeneity of tested samples. Waste should become a utilizable resource closing the loop of anthropogenic material cycle as the hidden potential of valuable materials in dumps is considerable.
Juris Burlakovs; Yahya Jani; Mait Kriipsalu; Zane Vincevica-Gaile; Fabio Kaczala; Gunita Celma; Ruta Ozola-Davidane; Laine Rozina; Vita Rudovica; Marika Hogland; Arturs Viksna; Kaur-Mikk Pehme; William Hogland; Maris Klavins. On the way to ‘zero waste’ management: Recovery potential of elements, including rare earth elements, from fine fraction of waste. Journal of Cleaner Production 2018, 186, 81 -90.
AMA StyleJuris Burlakovs, Yahya Jani, Mait Kriipsalu, Zane Vincevica-Gaile, Fabio Kaczala, Gunita Celma, Ruta Ozola-Davidane, Laine Rozina, Vita Rudovica, Marika Hogland, Arturs Viksna, Kaur-Mikk Pehme, William Hogland, Maris Klavins. On the way to ‘zero waste’ management: Recovery potential of elements, including rare earth elements, from fine fraction of waste. Journal of Cleaner Production. 2018; 186 ():81-90.
Chicago/Turabian StyleJuris Burlakovs; Yahya Jani; Mait Kriipsalu; Zane Vincevica-Gaile; Fabio Kaczala; Gunita Celma; Ruta Ozola-Davidane; Laine Rozina; Vita Rudovica; Marika Hogland; Arturs Viksna; Kaur-Mikk Pehme; William Hogland; Maris Klavins. 2018. "On the way to ‘zero waste’ management: Recovery potential of elements, including rare earth elements, from fine fraction of waste." Journal of Cleaner Production 186, no. : 81-90.
Arsenic in drinking water poses serious potential health risks in more than 30 countries with total affected population of around 100 million people. The present study is devoted to the development of innovative sorbents based on zeolite materials for As(V) sorption by modifying raw materials with iron oxyhydroxide and manganese oxychloride. Natural clinoptilolite and synthetic zeolite A were modified in order to obtain improved sorption of As(V). Sorption properties of newly developed sorbents were studied. Zeolites containing natural clinoptilolite are chosen due to relatively low cost and their broad use in industrial production as well as characteristic large surface area. Results obtained indicate that modification of zeolites with FeOOH and Mn8O10Cl3 significantly improves the As(V) sorption capacity of newly developed materials. As(V) sorption on FeOOH-modified aluminosilicates follows the Langmuir model, while on unmodified aluminosilicates it is described by the Freundlich model. As(V) sorption kinetics on both modified and unmodified materials most precisely can be described by Lagergren's pseudo-second-order kinetic model. Elevated As(V) concentration on the surface of Mn8O10Cl3 crystals and amorphous FeOOH indicates these compounds as responsible for sorption increase. Developed sorbents show improved performance in comparison with their unmodified counterparts, with a dramatic increase in As(V) sorption capacity up to 99.3 times in the case of FeOOH-modified calcium zeolite A. These materials have great potential for As(V) removal in aqueous medium. © 2017 Society of Chemical Industry
Andrejs Krauklis; Ruta Ozola-Davidane; Juris Burlakovs; Kristine Rugele; Kirill Kirillov; Kristaps Rubenis; Valentina Stepanova; Maris Klavins; Anna Trubaca-Boginska. FeOOH and Mn8O10Cl3modified zeolites for As(V) removal in aqueous medium. Journal of Chemical Technology & Biotechnology 2017, 92, 1948 -1960.
AMA StyleAndrejs Krauklis, Ruta Ozola-Davidane, Juris Burlakovs, Kristine Rugele, Kirill Kirillov, Kristaps Rubenis, Valentina Stepanova, Maris Klavins, Anna Trubaca-Boginska. FeOOH and Mn8O10Cl3modified zeolites for As(V) removal in aqueous medium. Journal of Chemical Technology & Biotechnology. 2017; 92 (8):1948-1960.
Chicago/Turabian StyleAndrejs Krauklis; Ruta Ozola-Davidane; Juris Burlakovs; Kristine Rugele; Kirill Kirillov; Kristaps Rubenis; Valentina Stepanova; Maris Klavins; Anna Trubaca-Boginska. 2017. "FeOOH and Mn8O10Cl3modified zeolites for As(V) removal in aqueous medium." Journal of Chemical Technology & Biotechnology 92, no. 8: 1948-1960.