International Conference of Recent Trends in Environmental Science and Engineering最新文献

{"title":"The Recovery Of Pgms From The UG2 Silicate Stream By Fine Grinding And Froth Flotation","authors":"Duncan Goqwane, W. Nheta, D. Rose","doi":"10.11159/rtese23.135","DOIUrl":"https://doi.org/10.11159/rtese23.135","url":null,"abstract":"– The Bushveld Igneous Complex (BIC) hosts the largest reserves of Platinum Group Metals (PGMs) in the world with most of the Platinum Group Element (PGE) mineralization occurring within the Merensky Reef, UG2, Platreef and Middle Group Chromitites reef. This research sought to investigate the PGMs locked in the silicates of the UG2 ore from the Eastern Limb. As most of the PGMs are locked in the silicate stream, these are disposed in the tailing dams. The silicate stream was characterized using the XRF, XRD, SEM and fire assaying through nickel sulphide collection. 1kg of the sample was milled in the rod mill to 80% passing 53 µm and floated in a D12 Denver flotation cell to recover the PGMs from the silicate stream based on Response Surface Methodology. It was found that the major mineral phases in the silicate stream were quartz, sphalerite, pyrrhotite, chalcopyrite and chromites. The size of the sulphide mineral that hosted the PGMs in the silicate was 20 µm. The highest concentrate grade obtained after flotation was 19.19 g/t of Pt. The as-received sample also had 0.95 g/t of Au which was recovered.","PeriodicalId":308370,"journal":{"name":"International Conference of Recent Trends in Environmental Science and Engineering","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121908803","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}

{"title":"Removal of Pharmaceuticals from High-Strength Wastewater by Adsorption on Commercial Granular Activated Carbon: Study of the Operating Conditions","authors":"Mina Asheghmoalla, M. Mehrvar","doi":"10.11159/rtese23.172","DOIUrl":"https://doi.org/10.11159/rtese23.172","url":null,"abstract":"The increased need for pharmaceuticals and personal care products has resulted in a rise in the volume of wastewater produced by drug manufacturing facilities. The manufacturing methods employed in producing pharmaceuticals result in the generation of significant amounts of heavily contaminated wastewater. These pollutants, if released into nature, can pose significant risks to both the environment and human health [1]. Sulfa drugs, aniline-derived compounds and solvents are among the organic matters that are used or generated during drug synthesis and are subsequently introduced into the wastewater pipeline during the vessel wash and system shutdown operation [2,3].","PeriodicalId":308370,"journal":{"name":"International Conference of Recent Trends in Environmental Science and Engineering","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125438509","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}

{"title":"Highly Efficient Silver Modified Srtio3 Photocatalyst: Synergistic Effect of Ag Doping and Ag Decoration","authors":"Marcela Frias Ordonez, Carolina Peverelli, E. Falletta, C. Bianchi","doi":"10.11159/rtese23.102","DOIUrl":"https://doi.org/10.11159/rtese23.102","url":null,"abstract":"Extended Abstract Nitrogen oxides (NO and NO2) are primary pollutants directly linked to respiratory diseases and environmental disasters such as acid rain and photochemical smog [1]. As a result, multiple techniques are used for their abatement. Among them, photocatalysis offers a cost-effective, green, and sustainable technology for air purification. This technology works at ambient condition, exploits the natural or artificial light, and uses semiconductors as photocatalysts to carry out the decomposition of inorganic pollutants on the surface of the material [2]. Over the last few years, perovskite-based materials have been considered as promising candidates for water splitting and water treatment applications [3]. However, their photocatalytic performance for indoor air pollution is scarcely examined. Strontium titanate (SrTiO3) is a cubic-like perovskite with a wide energy band gap (3.2 eV) similar to TiO2. Its chemical, thermal stability, and corrosion resistance make it more attractive for developing advanced thermally stable materials. Nevertheless, its light absorption is limited to the UV spectrum range [4]. For this reason, as for TiO2, proper modifications are required, including metal-doping or metaldecoration. In the former, new energy levels are created leading to energy band gap narrowing, whereas the later improves the charge carrier separation through the semiconductor interface. Both strategies impact significantly the final photocatalytic properties of the material [5]. The work aims at the rational designing of Ag-modified SrTiO3 composite for extending its photocatalytic efficiency towards the degradation of NOx under LED light by using some strategies such as doping and decoration. A preliminary study demonstrated that the 5 wt.% Ag-decorated SrTiO3 achieved nearly 77% NOx removal after 3h. Whilst, through an eco-friendly, simpler, and valuable one-pot synthesis SrTiO3 was doubly modified by Ag+-doping within the SrTiO3 lattice and by Ag nanoparticles-decoration on the SrTiO3 surface. These modifications were confirmed by the XRD technique, where a slight shift towards the higher angles and the presence of additional peaks corresponding to metallic silver could be observed. The synergistic effect between Ag doping and Ag decoration contributed to the complete photodegradation of NOx under LED light after 180 min, reaching a photocatalytic efficiency almost 4 times greater than bare SrTiO3 (26%). The stability of the best material was assessed by performing recycling tests.","PeriodicalId":308370,"journal":{"name":"International Conference of Recent Trends in Environmental Science and Engineering","volume":"07 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127284581","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}

{"title":"Efficient and Sustainable Room-Temperature CO2 Conversion by Plasmonic Two-Dimensional Metal-Oxide Hybrid Nano-Interfaces","authors":"M. K. Akbari, Nasrin Siraj Lopa, S. Zhuiykov","doi":"10.11159/rtese23.119","DOIUrl":"https://doi.org/10.11159/rtese23.119","url":null,"abstract":"- The state-of-the-art nanotechnologies ensure the establishment of sustainable green systems for CO 2 conversion. Recently, plasmonic two-dimensional (2D) nanostructures are found as effective platforms for efficient visible light-assisted photocatalysis. The plasmonic nanodomains grown on the surface of advanced 2D semiconductor materials represent a new class of hybrid nanostructures. These 2D hybrid nanostructures activate supplementary mechanisms at material heterointerfaces enabling a wide range of solar-activated physic-chemical reactions. Here, the controlled growth of plasmonic crystalline silver (Ag) nanodomains on the 2D surface oxide films of liquid Ga-based nanoparticles enabled the efficient CO 2 conversion through combined photocatalysis and acoustic-activated technique. Driven by acoustic energy, the multiple contribution of Ga 2 O 3 -Ag semiconductor/plasmonic hybrid 2D heterointerfaces enabled the visible-light assisted hot-electron generation at 2D plasmonic hybridinterfaces and therefore rose the CO 2 conversion efficiency to values higher than 94.6%. The inherent plasmonic characteristics of developed 2D nanojunction assembly accompanied by the commercial availability of acoustic activated technologies depict promising future for efficient and sustainable CO 2 conversion in industrial levels.","PeriodicalId":308370,"journal":{"name":"International Conference of Recent Trends in Environmental Science and Engineering","volume":"47 23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122214141","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}

{"title":"Strontium Titanate photocatalyst: Life Cycle Assessment on different Synthetic Routes","authors":"Marcela Frias Ordonez, E. Falletta, C. Bianchi","doi":"10.11159/rtese23.103","DOIUrl":"https://doi.org/10.11159/rtese23.103","url":null,"abstract":"Strontium titanate is a perovskite-type ceramic with excellent properties for numerous applications such as solar cells and gas sensors. A wide energy band gap (3.2 eV) similar to TiO 2 , its thermal stability, and corrosion resistance are some features, making it promising candidate for photocatalytic application under UV irradiation [1]. Moreover, its potential has been recently investigated for the photocatalytic degradation of pollutants and energy storage [2, 3]. Despite the great interest on this material, there has been no emphasis on its sustainable development, fabrication, and environmental impacts. Therefore, a laboratory-scale life cycle assessment (LCA) analysis was performed to compare the environmental impacts of SrTiO 3 obtained via six representative synthetic routes (cradle-to-gate). These routes were broadly divided into two categories: with and without thermal treatment. In the former scenario, ultrasound-assisted, sol-gel, and solid-state method were selected. Whilst, hydrothermal, molten salt, and solvothermal methods were considered as bottom-up synthesis strategies without calcination stage [4]. Lastly, the best case scenarios were assessed in order to provide a sustainable and greener strategy for SrTiO 3 photocatalyst production. In the scenario without thermal treatment, molten salt and hydrothermal synthesis procedures demonstrated considerable negative impacts, especially on Human toxicity (cancer effects) and Freshwater toxicity. These environmental effects were attributed to the energy consumption employed for long periods of time. On the other hand, ultrasound-assisted","PeriodicalId":308370,"journal":{"name":"International Conference of Recent Trends in Environmental Science and Engineering","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129180279","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}

{"title":"Photocatalytic Materials Immobilized On Recycled Supports as Alternative In the Degradation of Water Contaminants","authors":"V. Rodríguez-González","doi":"10.11159/rtese23.005","DOIUrl":"https://doi.org/10.11159/rtese23.005","url":null,"abstract":".","PeriodicalId":308370,"journal":{"name":"International Conference of Recent Trends in Environmental Science and Engineering","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130091093","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}

{"title":"COBMA Impact on CO2 Concentrations in the Mitigation of Air Pollution-Anthropogenic Climate Change from Mobile Sources Emissions","authors":"Raúl Guerrero Torres, M. Mehrvar","doi":"10.11159/rtese23.151","DOIUrl":"https://doi.org/10.11159/rtese23.151","url":null,"abstract":",","PeriodicalId":308370,"journal":{"name":"International Conference of Recent Trends in Environmental Science and Engineering","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133035228","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}

{"title":"Synthesis And Characterization Of Cu:Tio2 Photocatalysts With Suitable Optical Properties","authors":"A. Morales-Pérez, Daniela D. Suárez-Quiroz, H. Avila-Paredes","doi":"10.11159/rtese23.104","DOIUrl":"https://doi.org/10.11159/rtese23.104","url":null,"abstract":".","PeriodicalId":308370,"journal":{"name":"International Conference of Recent Trends in Environmental Science and Engineering","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121578174","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}

{"title":"Life Cycle Assessment of the Wood Pellet Supply Chain with a Consideration of Bioenergy for Remote Communities in Canada","authors":"Saghar SadaghianiFereshteh, Fereshteh Mafakheri, Zhi Chen","doi":"10.11159/rtese22.212","DOIUrl":"https://doi.org/10.11159/rtese22.212","url":null,"abstract":"","PeriodicalId":308370,"journal":{"name":"International Conference of Recent Trends in Environmental Science and Engineering","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114964290","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}

{"title":"Conversion of NO on Cerium Dioxide – Computational Modeling","authors":"G. Vayssilov, H. Aleksandrov, P. Petkov","doi":"10.11159/rtese22.171","DOIUrl":"https://doi.org/10.11159/rtese22.171","url":null,"abstract":"","PeriodicalId":308370,"journal":{"name":"International Conference of Recent Trends in Environmental Science and Engineering","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124857758","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}