Pub Date : 2023-11-24DOI: 10.3390/proceedings2023092047
M. Jakoobi, G. Carnide, Laure Vendier, Christian Bijani, A.-F. Mingotaud, Richard Clergereaux, Myrtil L. Kahn
{"title":"Synthesis of Molybdenum Oxide and Sulfide Nanoparticles at Room Temperature Using Organometallic Approach","authors":"M. Jakoobi, G. Carnide, Laure Vendier, Christian Bijani, A.-F. Mingotaud, Richard Clergereaux, Myrtil L. Kahn","doi":"10.3390/proceedings2023092047","DOIUrl":"https://doi.org/10.3390/proceedings2023092047","url":null,"abstract":"","PeriodicalId":504549,"journal":{"name":"International Conference EcoBalt 2023 \"Chemicals & Environment\"","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139239635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-24DOI: 10.3390/proceedings2023092044
Alvina Reihan, Kati Roosalu
A comparison of the total
总人数的比较
{"title":"Estimation of the Share of Total Nutrient Load from the Territory of Estonia along the Narva River to the Baltic Sea","authors":"Alvina Reihan, Kati Roosalu","doi":"10.3390/proceedings2023092044","DOIUrl":"https://doi.org/10.3390/proceedings2023092044","url":null,"abstract":"A comparison of the total","PeriodicalId":504549,"journal":{"name":"International Conference EcoBalt 2023 \"Chemicals & Environment\"","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139240183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-24DOI: 10.3390/proceedings2023092041
Simona Bartkova, Fenella Lucia Sulp, Immanuel Sanka, P. Pata, O. Scheler
{"title":"Droplet-Based Technology for Studying the Phenotypic Effect of Microplastics on Antimicrobial Resistance","authors":"Simona Bartkova, Fenella Lucia Sulp, Immanuel Sanka, P. Pata, O. Scheler","doi":"10.3390/proceedings2023092041","DOIUrl":"https://doi.org/10.3390/proceedings2023092041","url":null,"abstract":"","PeriodicalId":504549,"journal":{"name":"International Conference EcoBalt 2023 \"Chemicals & Environment\"","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139238419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-24DOI: 10.3390/proceedings2023092048
Rocco Gasco, Isabelle A. M. Worms, V. Slaveykova
derived from the diatom Cyclotella meneghiniana , and, in particular, their colloidal stability and transformations. To this end, a combination of different state-of-the-art techniques was employed to characterize the AgNPs-EPS interactions: Asymmetric Flow Field-Flow Fractionation (AF4) coupled with ICP-MS, Dynamic Light Scattering (DLS), Zeta Potential, and Surface Plasmon Resonance (SPR) absorbance spectroscopy. The changes in the size distribution, surface properties, and stability of Cit-AgNPs (4 mg/L) in the presence of various concentrations of EPS (130, 65, 32.5, and 13 mg C/L) were studied in both short-term (0–2 h) and long-term (72 h) experiments. The results showed that EPS stabilizes Cit-AgNPs, presumably through the formation of an ecocorona. The interaction occurred rapidly in the short term, leading to long-term stabilization, as revealed by the changes in the SPR-UV-Vis spectrum, characterized by the appearance of a typical shoulder associated with AgNPs’ aggregation/agglomeration and alterations in hydrodynamic diameter. In the presence of EPS, the surface charge (zeta potential) of the Cit-AgNPs also shifted towards values similar to those of EPS alone, indicating an interaction. The EPS reduced the dissolution of Cit-AgNPs after 24 h. AF4-MD-ICP-MS provides relevant information with respect to DLS and UV-Vis spectroscopy, confirming the change in size of the Cit-AgNPs, the stabilization in the long term, and the interaction with the EPS. Taken together, the results of this study demonstrate that the EPS derived from the diatom Cyclotella meneghiniana modifies the surface properties and stability of 20 nm Cit-AgNPs. Therefore, such interactions have to be taken into consideration for predicting the fate and effects of Cit-AgNPs in the environment.
{"title":"The Interaction between Extracellular Polymeric Substances from Diatom Cyclotella meneghiniana and Citrate-Coated Silver Nanoparticles","authors":"Rocco Gasco, Isabelle A. M. Worms, V. Slaveykova","doi":"10.3390/proceedings2023092048","DOIUrl":"https://doi.org/10.3390/proceedings2023092048","url":null,"abstract":"derived from the diatom Cyclotella meneghiniana , and, in particular, their colloidal stability and transformations. To this end, a combination of different state-of-the-art techniques was employed to characterize the AgNPs-EPS interactions: Asymmetric Flow Field-Flow Fractionation (AF4) coupled with ICP-MS, Dynamic Light Scattering (DLS), Zeta Potential, and Surface Plasmon Resonance (SPR) absorbance spectroscopy. The changes in the size distribution, surface properties, and stability of Cit-AgNPs (4 mg/L) in the presence of various concentrations of EPS (130, 65, 32.5, and 13 mg C/L) were studied in both short-term (0–2 h) and long-term (72 h) experiments. The results showed that EPS stabilizes Cit-AgNPs, presumably through the formation of an ecocorona. The interaction occurred rapidly in the short term, leading to long-term stabilization, as revealed by the changes in the SPR-UV-Vis spectrum, characterized by the appearance of a typical shoulder associated with AgNPs’ aggregation/agglomeration and alterations in hydrodynamic diameter. In the presence of EPS, the surface charge (zeta potential) of the Cit-AgNPs also shifted towards values similar to those of EPS alone, indicating an interaction. The EPS reduced the dissolution of Cit-AgNPs after 24 h. AF4-MD-ICP-MS provides relevant information with respect to DLS and UV-Vis spectroscopy, confirming the change in size of the Cit-AgNPs, the stabilization in the long term, and the interaction with the EPS. Taken together, the results of this study demonstrate that the EPS derived from the diatom Cyclotella meneghiniana modifies the surface properties and stability of 20 nm Cit-AgNPs. Therefore, such interactions have to be taken into consideration for predicting the fate and effects of Cit-AgNPs in the environment.","PeriodicalId":504549,"journal":{"name":"International Conference EcoBalt 2023 \"Chemicals & Environment\"","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139240312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-24DOI: 10.3390/proceedings92010045
Anastasija Petrova, A. Lukjanova, I. Blinova, H. Vija, M. Heinlaan
{"title":"Hazard Evaluation of Novel Plasticizer, Di(2-Propylheptyl) Phthalate, to Aquatic Ecosystems","authors":"Anastasija Petrova, A. Lukjanova, I. Blinova, H. Vija, M. Heinlaan","doi":"10.3390/proceedings92010045","DOIUrl":"https://doi.org/10.3390/proceedings92010045","url":null,"abstract":"","PeriodicalId":504549,"journal":{"name":"International Conference EcoBalt 2023 \"Chemicals & Environment\"","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139239142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-24DOI: 10.3390/proceedings2023092051
R. Levinas, V. Pakštas, A. Selskis, Tomas Murauskas, Roman Viter, A. Jagminienė, I. Stankevičienė, E. Norkus
: In the renewable energy field, the conversion of solar light into electrical or chemical energy is considered essential to moving towards a truly green energy economy. Solar energy can be harnessed not just through generating electricity with photovoltaic cells but also by driving photoelectrochemical (PEC) reactions such as water splitting or pollutant oxidation. In this study, TiO 2 films were synthesized electrochemically through a procedure called plasma electrolytic oxidation (PEO). Under specific conditions, as the Ti substrate dissolves and the oxide film grows, electron discharges occur across the film, and this ionizes both the oxide and some amount of electrolyte that had been in contact with it. The mixture then cools, leaving a macroporous TiO 2 structure. What is particularly interesting for PEC applications is that the films can be crystalline and doped after synthesis. XRD analysis revealed that a TiO 2 film that had been obtained at a voltage of 200 V had an anatase crystal structure. In addition, during ionization and cooling, ions from the solution can be incorporated into the film. By adding 0.1 M Cu 2 SO 4 into the synthesis electrolyte, we were able to incorporate Cu into the films, as proven EDX and XPS. The TiO 2 and heterostructured films showed good PEC water-splitting activity and stability in alkaline media when illuminated with 365 nm LED light. It was found that the photocurrent obtained depends on the synthesis voltage and that the heterostructured films would generate ~2 times larger photocurrents. In addition, further surface functionalization (e.g., with Au) was investigated. Electron–hole recombination was evaluated using an advanced non-stationary photoelectrochemical technique—intensity-modulated photocurrent spectroscopy (IMPS). Generally, films have very little recombination and only at lower overpotentials up to ~1 V. Overall, the synthesis of oxide films through PEO may provide an efficient alternative to obtaining crystalline films via annealing, and various heterostructures can be created simply by modifying synthesis conditions.
:在可再生能源领域，将太阳能转化为电能或化学能被认为是实现真正绿色能源经济的关键。太阳能不仅可以通过光伏电池发电来利用，还可以通过光电化学（PEC）反应（如水分离或污染物氧化）来利用。本研究采用等离子电解氧化（PEO）工艺，通过电化学方法合成了 TiO 2 薄膜。在特定条件下，随着钛基底的溶解和氧化膜的生长，电子在氧化膜上放电，使氧化物和与之接触的一定量的电解质电离。然后，混合物冷却，形成大孔的 TiO 2 结构。对于 PEC 应用来说，特别有趣的是，合成后的薄膜可以结晶和掺杂。XRD 分析表明，在 200 V 电压下获得的氧化钛薄膜具有锐钛矿晶体结构。此外，在电离和冷却过程中，溶液中的离子也会融入薄膜中。通过在合成电解液中加入 0.1 M Cu 2 SO 4，我们能够将 Cu 加入到薄膜中，EDX 和 XPS 证实了这一点。用 365 纳米 LED 光照射 TiO 2 和异质结构薄膜时，它们在碱性介质中表现出良好的 PEC 水分离活性和稳定性。研究发现，获得的光电流取决于合成电压，而异质结构薄膜产生的光电流要大 2 倍。此外，还研究了进一步的表面功能化（如金）。使用先进的非稳态光电化学技术--强度调制光电流光谱法（IMPS）对电子-空穴重组进行了评估。一般来说，薄膜的重组极少，而且仅在较低的过电位（约 1 V）下才会发生。总之，通过 PEO 合成氧化物薄膜可能是通过退火获得晶体薄膜的一种高效替代方法，而且只需改变合成条件就能制造出各种异质结构。
{"title":"Plasma Electrolytic Oxidation Synthesis of Heterostructured TiO2 for Photoanode Applications","authors":"R. Levinas, V. Pakštas, A. Selskis, Tomas Murauskas, Roman Viter, A. Jagminienė, I. Stankevičienė, E. Norkus","doi":"10.3390/proceedings2023092051","DOIUrl":"https://doi.org/10.3390/proceedings2023092051","url":null,"abstract":": In the renewable energy field, the conversion of solar light into electrical or chemical energy is considered essential to moving towards a truly green energy economy. Solar energy can be harnessed not just through generating electricity with photovoltaic cells but also by driving photoelectrochemical (PEC) reactions such as water splitting or pollutant oxidation. In this study, TiO 2 films were synthesized electrochemically through a procedure called plasma electrolytic oxidation (PEO). Under specific conditions, as the Ti substrate dissolves and the oxide film grows, electron discharges occur across the film, and this ionizes both the oxide and some amount of electrolyte that had been in contact with it. The mixture then cools, leaving a macroporous TiO 2 structure. What is particularly interesting for PEC applications is that the films can be crystalline and doped after synthesis. XRD analysis revealed that a TiO 2 film that had been obtained at a voltage of 200 V had an anatase crystal structure. In addition, during ionization and cooling, ions from the solution can be incorporated into the film. By adding 0.1 M Cu 2 SO 4 into the synthesis electrolyte, we were able to incorporate Cu into the films, as proven EDX and XPS. The TiO 2 and heterostructured films showed good PEC water-splitting activity and stability in alkaline media when illuminated with 365 nm LED light. It was found that the photocurrent obtained depends on the synthesis voltage and that the heterostructured films would generate ~2 times larger photocurrents. In addition, further surface functionalization (e.g., with Au) was investigated. Electron–hole recombination was evaluated using an advanced non-stationary photoelectrochemical technique—intensity-modulated photocurrent spectroscopy (IMPS). Generally, films have very little recombination and only at lower overpotentials up to ~1 V. Overall, the synthesis of oxide films through PEO may provide an efficient alternative to obtaining crystalline films via annealing, and various heterostructures can be created simply by modifying synthesis conditions.","PeriodicalId":504549,"journal":{"name":"International Conference EcoBalt 2023 \"Chemicals & Environment\"","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139241109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-24DOI: 10.3390/proceedings2023092042
M. Jakoobi, K. Fajerwerg, Myrtil L. Kahn
and nanomaterials with unprecedented properties, with the aim of developing functional and innovative solutions to societal challenges (Figure 1). To achieve this, we are applying an organometallic approach for the synthesis of well-defined nanoparticles (NPs) and nanomaterials [1]. This bottom-up approach allows control of the NPs synthesis (size, shape, colloidal stability) on a molecular level with the help of cleverly designed starting molecular precursor(s), under mild reaction conditions and in safe-by-design approaches [2]. The presentation will focus on our team’s research related to the synthesis and properties of NPs and nanomaterials, their implementation into devices for either gas detection (i
{"title":"From Organometallic Chemistry to Multifunctional Nanoparticle-Based Devices for Gas Detection and Degradation of Air Pollutants","authors":"M. Jakoobi, K. Fajerwerg, Myrtil L. Kahn","doi":"10.3390/proceedings2023092042","DOIUrl":"https://doi.org/10.3390/proceedings2023092042","url":null,"abstract":"and nanomaterials with unprecedented properties, with the aim of developing functional and innovative solutions to societal challenges (Figure 1). To achieve this, we are applying an organometallic approach for the synthesis of well-defined nanoparticles (NPs) and nanomaterials [1]. This bottom-up approach allows control of the NPs synthesis (size, shape, colloidal stability) on a molecular level with the help of cleverly designed starting molecular precursor(s), under mild reaction conditions and in safe-by-design approaches [2]. The presentation will focus on our team’s research related to the synthesis and properties of NPs and nanomaterials, their implementation into devices for either gas detection (i","PeriodicalId":504549,"journal":{"name":"International Conference EcoBalt 2023 \"Chemicals & Environment\"","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139239913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-24DOI: 10.3390/proceedings2023092040
K. Kasemets, Jüri Laanoja, M. Sihtmäe, H. Vija, I. Kurvet, Maarja Otsus, A. Kahru
{"title":"Silver–Chitosan Nanocomposites for Biomedical Application: Design, Synthesis and Antimicrobial Efficiency","authors":"K. Kasemets, Jüri Laanoja, M. Sihtmäe, H. Vija, I. Kurvet, Maarja Otsus, A. Kahru","doi":"10.3390/proceedings2023092040","DOIUrl":"https://doi.org/10.3390/proceedings2023092040","url":null,"abstract":"","PeriodicalId":504549,"journal":{"name":"International Conference EcoBalt 2023 \"Chemicals & Environment\"","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139241706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-23DOI: 10.3390/proceedings2023092037
Jekaterina Sydorenko, M. Krunks, Avro Mere, M. Krichevskaya, I. Oja Acik
{"title":"Spray-Pyrolysis Synthesised TiO2 Thin Films for Photocatalytic Air Treatment from Volatile Organic Compounds","authors":"Jekaterina Sydorenko, M. Krunks, Avro Mere, M. Krichevskaya, I. Oja Acik","doi":"10.3390/proceedings2023092037","DOIUrl":"https://doi.org/10.3390/proceedings2023092037","url":null,"abstract":"","PeriodicalId":504549,"journal":{"name":"International Conference EcoBalt 2023 \"Chemicals & Environment\"","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139242750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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