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Surface analysis of different wood polymer composites exposed to artificial weathering

Journal of Wood Chemistry and Technology 2024年第2期44卷 88-101页

作者： Acosta, Andrey Pereira Amico, Sandro Campos Delucis, Rafael de Avila Missio, André Luiz Bueno Rodrigues, Marlon Bender Ribeiro, Ana Carolina Rodrigues Goularte, Matheus de Paula Gatto, Darci Alberto PostGraduate Program in Mining Metallurgical and Materials Engineering Federal University of Rio Grande do Sul Porto Alegre Brazil PostGraduate Program in Materials Science and Engineering Federal University of Pelotas Pelotas Brazil Materials Engineering Undergraduate Course Federal University of Pelotas Pelotas Brazil

This study presents a superficial analysis of different wood polymer composites (WPC) comprising polystyrene (WPSC), poly(furfuryl alcohol) (WPFAC), and pine resin (WPRC) when exposed to artificial weathering. The study investigates the influence of resin type on the composites, focusing on their chemical, colorimetric, morphological, and thermal properties. The main findings indicate WPSC exhibits poor resistance to weathering, allowing ultraviolet radiation damage on the lignocellulosic component of the composite, leading to oxidized groups formation. Conversely, WPFAC and WPRC demonstrate good wood protection capabilities by preventing significant deterioration of holocellulose and acting as filters for radiation and moisture. Moreover, WPFAC exhibits the lowest decrease in carbonyl index and O/C ratio, with reductions of 2.6 and 11.6%, respectively. These findings are significant as they demonstrate that poly(furfuryl alcohol) and pine resin can be used to produce WPCs that delay and mitigate wood degradation by weathering, contributing to the increased potential utilization of bioresins. © 2024 Taylor & Francis Group, LLC.

关键词： Weathering

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Polymer blends of poly(lactic acid) and starch for the production of films applied in food packaging: A brief review

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Polymers from Renewable Resources 2023年第2期14卷 108-153页

作者： Carneiro da Silva, Lucas Rafael Rios, Alessandro de Oliveira Campomanes Santana, Ruth Marlene Postgraduate Program in Mining Metallurgical and Materials Engineering Laboratory of Polymeric Materials Federal University of Rio Grande do Sul Rio Grande do Sul Brazil Postgraduate Program in Food Science and Technology Laboratory of Bioactive Compounds Federal University of Rio Grande do Sul Rio Grande do Sul Brazil

The limited degradation of synthetic polymers used in food packaging when discarded in the environment is a major concern for society. Therefore, industry and academia have sought to develop biodegradable and eco-friendly materials for single-use in packaging. An interesting alternative for the food industry is biodegradable polymeric films, which is why different biopolymers have been used in the production of sustainable packaging. It is worth mentioning that the use of biodegradable polymers is one of the most successful innovations in the industry to address issues related to the environment. Among the available raw materials, starch extracted from different renewable sources is very promising for this purpose, due to its abundance, low-cost compared to other polymers and ability to produce non-toxic films. However, when used alone, pure starch has many limitations, which can be overcome by developing a mixture with other polymers (polymer blends), preferably from renewable and biodegradable sources, such as poly(lactic acid) (PLA). In this context, the absence of literature reviews evidencing the results of the application of films in foods led us to write this article, given the importance of polymer blends produced with different types of starch (cassava, corn, pea, potato, rice and wheat) and the PLA matrix. According to the results, it is clear that polymer blends based on PLA/Starch for food packaging are very promising, already being part of the industries solutions, aiming to minimize the large volume of plastic waste of petrochemical origin discarded in nature. Obviously, as with any technology, more research is needed to further improve the performance of the films, and while much research has made great strides, there are still limitations that prevent the commercialization of these materials. © The Author(s) 2023.

关键词： Starch

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Electrocoagulation for Hospital Wastewater Treatment: Comparing Neural Network Models for Performance Simulation

Biomedical Materials and Devices

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Biomedical Materials and Devices 2025年 1-28页

作者： Indira, Dewi Muzayyanah, Fitri Fauzi, Rifky Simanjuntak, Wasinton Yandri, Yandri Rohman, Fakhrony Sholahudin Sudibyo, Sudibyo Rakesh, Benadict Maryani, Anis Tatik Wibowo, Yudha Gusti Doctoral Program of Environmental Science Department of Postgraduate Program Universitas Lampung Lampung Indonesia Department of Mathematics Faculty of Science Institut Teknologi Sumatera Lampung Selatan Indonesia Department of Chemistry Universitas Lampung Lampung Indonesia Process Systems Engineering Centre (PROSPECT) Research Institute of Sustainable Environment (RISE) Universiti Teknologi Malaysia UTM Johor Bahru Johor 81310 Malaysia Research Center for Mining Technology National Research and Innovation Agency (BRIN) South Lampung 35352 Indonesia Council of Scientific and Industrial Research Institute of Minerals and Materials Technology Govt.of India Bhubaneswar India Postgraduate Program of Environmental Science Universitas Jambi Jambi Indonesia Department of Mining Engineering Faculty of Technologi Industry Institut Teknologi Sumatera Jl. Terusan Ryacudu Lampung Way Hui 35365 Indonesia Center for Green and Sustainable Materials Institut Teknologi Sumatera Lampung Indonesia

Hospital wastewater contains a complex mixture of pollutants, including biological, chemical, and pharmaceutical contaminants, which necessitates effective treatment strategies. This study investigates the efficiency of electrocoagulation for treating hospital wastewater while employing predictive modeling techniques, including feedforward neural networks (FFNN), neural Wiener (NW), neural Hammerstein (NH), and neural Hammerstein–Wiener (NHW) models. The electrocoagulation process was conducted using aluminum and carbon electrodes, with varying voltage levels (5 V, 10 V, and 15 V) and treatment durations (30, 60, 90, and 120 min). Key water quality parameters, including turbidity, biochemical oxygen demand (BOD), chemical oxygen demand (COD), Escherichia coli, and coliform bacteria, were analyzed before and after treatment. Results demonstrated that increasing voltage and contact time significantly enhanced pollutant removal, with the highest removal efficiencies observed at 15 V and 120 min. Electrocoagulation effectively reduced turbidity, BOD, and COD levels while achieving substantial microbial inactivation. The predictive models successfully captured electrocoagulation dynamics, with the neural Hammerstein–Wiener model exhibiting the highest accuracy (root mean square error [RMSE]: 0.0399, weighted mean absolute percentage error [WMAPE]: 0.0665). These findings suggest that electrocoagulation, coupled with advanced modeling techniques, provides a sustainable and efficient hospital wastewater treatment approach. Future research should focus on optimizing operational parameters, integrating hybrid treatment methods, and developing real-time monitoring systems to enhance treatment efficiency and cost-effectiveness. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2025.

关键词： Electrocoagulation Hospital wastewater Neural modeling Wastewater treatment

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Development of a Methodology for Forecasting of Photovoltaic Generation in the Short and Medium Term Based on an Analysis of a Photovoltaic System and a Meteorological Forecasting Platform

SSRN

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SSRN 2024年

作者： Rosso, André Possamai Rampinelli, Giuliano Arns Schaeffer, Lirio Federal University of Rio Grande do Sul Porto Alegre Brazil Postgraduate Program in Mining Metallurgical and Materials Engineering Antônio Marcelo Ferreira Street 41 Criciúma Santa Catarina88810-016 Brazil Federal University of Santa Catarina Araranguá Brazil Postgraduate Program in Energy and Sustainability Pedro João Pereira Street 150 Araranguá Santa Catarina88905-120 Brazil Postgraduate Program in Mining Metallurgical and Materials Engineering Aneron Correa de Oliveira Street 250 Porto Alegre Rio Grande do Sul 91410-070 Brazil

Uncertainties in PV production can make it challenging to dispatch energy into the electricity grid. Although PV storage solves this problem, predicting the solar photovoltaic (PV) energy produced is necessary to control the energy injected into the grid. In Brazil, photovoltaic solar energy has grown exponentially in recent years. The current scenario in Brazil is a synergy of legal, regulatory, research and development, fiscal, tax, and economic incentives. With the country's solar energy growth, there is a need to develop and apply methodologies for predicting photovoltaic generation. This article aims to develop a methodology (RRS) for predicting photovoltaic generation in the short (1h to 10h future) and medium (24h future) terms using the generation data from a grid-connected photovoltaic system and to compare it with the persistence method (PM). Numerical weather prediction (NWP) variables such as irradiance, cloud cover, and precipitation are input for next-day prediction models. Photovoltaic predictions for the next day's horizon show the most significant errors compared to predictions for the horizon a few hours ahead. The proposed RRS model is simple, easy to access and apply, and does not use irradiance data. In the RRS model, some parameters are already built in and do not need to be dealt with, such as soiling of the photovoltaic modules, shading, spectral mismatch of the photovoltaic cells with the radiation spectrum, losses due to mismatch, losses due to cabling, losses due to series and parallel resistance, among others. The application of the RRS methodology requires two searches/inputs. The first input is weather forecast data obtained from a weather forecasting platform, and the second is actual historical data on photovoltaic generation at the site where the method was developed. © 2024, The Authors. All rights reserved.

关键词： Weather forecasting

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Tecnological Tests of the Pegamites Residues Extraction at Alto Dois Irmãos/Pb in Borborema Pegmatitic Province/Bpp

SSRN

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SSRN 2023年

作者： Silva, Gerson Ferreira de Brum, Irineu Cordeiro, Vinícius Becheleni, Emily Araújo, Defsson Federal University of Rio Grande do Sul – UFRGS Postgraduate Program in Mining Engineering Metallurgical and of Materials Brazil Federal University of Rio Grande do Sul – UFRGS Department of Metallurgical Engineering Postgraduate Program in Mining Engineering Metallurgical and Materials Brazil Federal University of Campina Grande – UFCG Academic Unity of Mining and Geology Brazil Federal University of Vales do Jequitinhonha e Mucuri – UFVJM Engineering Institute Science and Technology Brazil Federal University of Campina Grande – IFPB Federal Institute of Science Education and Technology of Paraíba Campus Picuí Brazil

The Borborema Pegmatitic Province – BPP situated between Paraiba and Rio Grande do Norte states in Brazilian northeast presents several pegmatites occurrences. In the region of the county of Pedra Lavrada – PB, are observed various mineral occurrences where the pegmatites have been explored with prominence at Alto Dois Irmãos-PB pegmatite, in what quartz, feldspar and mica are extracted. Because an existence of a complex mineralogy of the pegmatites, the understanding about mineral constituent is fundamental to define its industrial employment and also to implement improvements in beneficiation process. The proposal of this research line is the detailed characterization and proof that part of the ore (quartz) considered sterile, presents low poisoning (Fe2O3) and high silica (SiO2) content, to enable its industrial use mainly to nobler purposes. Also will be fundamental to minimize the environmental impact and decrease the grinding energetic consume. Besides that, the obtained results of this research will be used in a future work, as inputs in simulation stage, aiming to optimize the researched beneficiation unity grinding process. To the pegmatite characterization were done density determination tests, mineralogical identification by X-ray diffraction (XRD), chemical analysis by fluorescents X-rays and morphological analysis by scanning electron microscopy (SEM/EDS). Then were done tests to Work Index (WI) calculous. The sterile (quartz extraction) from pegmatite mining in Pedra Lavrada/PB presented medium density of 2,66g/cm3, majority chemical composition of silicon and oxygen and quartz as the mainly mineralogical stage, through X-ray diffractograms and scanning electron microscopy images, what indicates that this material has high purity. The Work Index (WI) was 15,9 kwh/t, showing that this material presents in the pegmatite can be consider resistant to breaking in grinding process. © 2023, The Authors. All rights reserved.

关键词： Quartz

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Synthesis, Characterization, and performance test of modified Zeolite-Si/Al nanocomposite from pumice and waste cans using slow pyrolysis process for removal pollutant parameters from hard water

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Environmental Nanotechnology, Monitoring and Management 2023年 20卷

作者： Gusti Wibowo, Yudha Sudibyo Rianjanu, Aditya Taher, Tarmizi Susanti, Noni Karo Karo, Pulung Suprihatin Iman Supriyatna, Yayat Prasetyo, Erik Bahfie, Fathan Amin, Muhammad Syarifuddin, Hutwan Safitri, Hana Khairurrijal, Khairurrijal Department of Mining Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Research Center for Mining Technology National Research and Innovation Agency Lampung Indonesia Department of Material Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Department of Environmental Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Physics Department Universitas Lampung Lampung Indonesia Department of Environmental Science Postgraduate Program Universitas Jambi Jambi 36122 Indonesia Laboratory of Mine Environmental Department of Mining Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Department of Physics Institut Teknologi Sumatera Lampung-36365 Indonesia Department of Physics Institut Teknologi Bandung Bandung 40132 Indonesia Center for Green and Sustainable Materials Institut Teknologi Sumatera Indonesia

Hard water is one of crucial problems in the world due to its pollutant parameters. Adsorption is a promising method for treating hard water because of its benefits such as low-cost, easy to use, acceptable, and easy to maintenance. In this study, we utilized zeolite functionalized with silicon/aluminum (Ze-Si/Al) as adsorbent materials for hard water treatment. Ten different ratios of Si/Al were added into zeolite by modifying the solid waste source concentration (pumice and cans). The optimum sample was then further tested with different parameters including contact time, dye concentration, and isotherm models. The zeolite-Si/Al adsorbent was characterized by Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD), and X-Ray Fluorescence (XRF). Results of this study have showed that the best functionalized zeolite was that with Si/Al ratio 0.67, which has higher sorption ability. In contact time test, the equilibrium was reached after 300 min. This study also informed that the concentration of dyes will give impact on removal of pollutant parameters. Isotherm model of Ze-Si/Al fitted with Langmuir method. This study also discussed the potential development and future research direction. Thus, this study is a crucial report to develop the information about waste utilization as source of Si/Al to increasing quality of zeolite. © 2023 Elsevier B.V.

关键词： Adsorption Hard water Wastewater Wastewater treatment zeolite-Si/Al

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Preliminary formulation of non-linear consolidation coefficients for unsaturated soil

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AIP Conference Proceedings 2024年第1期3019卷

作者： Aris Rinaldi Lilik Eko Widodo Reza Adhi Fajar Junior Water Resources Expert Technical Implementation Unit for Dam Engineering Ministry of Public Works and Housing Gedung Balai Teknik Bendungan. Jl Sapta Taruna Raya Jakarta Selatan 12310 Indonesia Research Group of Earth Resource Exploration Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Jl. Ganesha No. 10 Bandung 40132 Indonesia Postgraduate Student of Doctoral Program Mining Engineering Bandung Institute of Technology Hydrogeology Lab. Jl. Ganesha No. 10 Bandung 40132 Indonesia

The water content is the amount of water contained in the medium – in this case, soil. The water contained in the soil represents soil condition, from the surface down to the ground. The surface position of the land to the groundwater table is referred to as the vadose zone, while the region below the groundwater level is called the saturated soil zone. The capillary fringe is a transitional zone between the vadose zone and the saturated soil zone. The unsaturated zone is defined as the part of the vadose zone between the ground surface and the capillary fringe. Distribution of water content in the soil is closely related to infiltration and consolidation processes. Infiltration is the process of water flow from the surface into the ground, while consolidation is the process of water dissipation from the soil pore medium due to the loading that causing a decline in volume or the soil pore cavity. Infiltration and consolidation are closely related to the compositional changes in water and air content of the soil. Groundwater scientific developments, in terms of engineering, science and technology, have been impactful. This research involves the investigation of a correlation between the distribution of water content and unsaturated consolidation and is expected to offer new insights in groundwater science.

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Rapid and highly efficient adsorption of dye and heavy metal on low-cost adsorbent derived from human feces and Chlorella vulgaris

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Environmental Nanotechnology, Monitoring and Management 2023年 20卷

作者： Wibowo, Yudha Gusti Lululangin, Bonifasius Revo Gifta Safitri, Hana Rohman, Arif Sudibyo Priyanto, Sugeng Syarifuddin, Hutwan Tatik Maryani, Anis Tawfiqurahman Yuliansyah, Ahmad Kurniawan, Ade Tsabitah, Natasya Taher, Tarmizi Petrus, Himawan Tri Bayu Murti Sustainable Mining and Environmental Research Group Department of Mining Engineering Institut Teknologi Sumatera Jl. Terusan Ryacudu Way Huwi Kec. Jati Agung Kabupaten Lampung Selatan Lampung 35365 Indonesia Center for Green and Sustainable Materials Institut Teknologi Sumatera Jl. Terusan Ryacudu Way Huwi Kec. Jati Agung Kabupaten Lampung Selatan Lampung 35365 Indonesia Departement of Chemical Engineering Universitas Gadjah Mada Jl Grafika No. 2 Sleman Bulaksumur 55284 Indonesia Department of Geomatic Engineering Institut Teknologi Sumatera Jl. Terusan Ryacudu Way Huwi Kec. Jati Agung Kabupaten Lampung Selatan Lampung 35365 Indonesia Research Center for Mining Technology - National Research and Innovation Agency Jl. Ir. Sutami KM. 15 Tanjung Bintang South Lampung Lampung 35361 Indonesia Department of Mechanical Engineering Universitas Negeri Jakarta Jakarta Indonesia Postgraduate Program of Environmental Science Universitas Jambi Jambi Indonesia Department of Environmental Engineering Institut Teknologi Sumatera Jl. Terusan Ryacudu Way Huwi Kec. Jati Agung Kabupaten Lampung Selatan Lampung 35365 Indonesia

Wastewater management is a pressing global concern, demanding effective, efficient, cost-friendly, and user-friendly solutions. Among the various methods available, adsorption has emerged as a practical choice. The primary culprits responsible for many human diseases in wastewater are heavy metals and dyes. In this study, we successfully harnessed low-cost biochar derived from human feces and Chlorella vulgaris to significantly accelerate and enhance the removal of heavy metals and dyes. Human feces and Chlorella vulgaris were transformed into biochar under three distinct conditions: biochar, Chlorella vulgaris, and a combination of both. Notably, these materials exhibited exceptional capabilities, removing heavy metals and dyes by as much as 98 % within a mere 10-minute timeframe. This material have adsorption capacity up to 56.8 mg/g for Mn and 20 mg/g for Methylene Blue. To comprehensively evaluate the performance of the optimal samples, we conducted a battery of tests, including performance assessments, sorption capacity measurements, exploration of five isotherm models, and kinetic analyses. Furthermore, we elucidated the sorption mechanisms through thorough characterizations of the materials using SEM, XRD, FTIR, and XRF, providing holistic insights into their properties. This study extends its relevance beyond the laboratory, offering valuable insights into future prospects and policy recommendations. In doing so, it serves as a pivotal resource for researchers and governmental bodies alike, facilitating progress in wastewater treatment and environmental policy development. © 2023 Elsevier B.V.

关键词： Adsorption Biochar Dye sorption Heavy metal sorption Nanocomposite material Wastewater

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Correction: Evaluating the Environmental Impacts at the End Point Level of the Biodiesel Production Process from Multiple Feedstocks in Indonesia Through Life Cycle Assessment Methodology

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Waste and Biomass Valorization 2023年第1期15卷 523-523页

作者： Wahyono, Yoyon Hadiyanto, Hadiyanto Gheewala, Shabbir H. Budihardjo, Mochamad Arief Adiansyah, ·Joni Safaat Widayat, Widayat Christwardana, Marcelinus Doctoral Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia Master Program of Energy School of Postgraduate Studies Diponegoro University Semarang Indonesia The Joint Graduate School of Energy and Environment King Mongkut’s University of Technology Thonburi Bangkok Thailand Center of Excellence on Energy Technology and Environment (CEE) Ministry of Higher Education Science Research and Innovation Bangkok Thailand Department of Environmental Engineering Faculty of Engineering Diponegoro University Semarang Indonesia Mining Engineering Department Faculty of Engineering Muhammadiyah University of Mataram Mataram Indonesia Department of Chemistry Faculty of Science and Mathematics Diponegoro University Semarang Indonesia

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Study of domestic wastewater in oil and gas field: A case study in the Cangkring river, Tuban, East Java

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IOP Conference Series: Earth and Environmental Science 2022年第1期963卷

作者： A S Patimah A Prasetya S H Murti Department of Mining Engineering Universitas Papua 98314 West Papua Indonesia Student of Doctoral Program in Environmental Science School of Postgraduate Universitas Gadjah Mada 55281 Yogyakarta Indonesia Department of Chemical Engineering Faculty of Engineering Universitas Gadjah Mada 55281 Yogyakarta Indonesia Department of Geographic Information Science Faculty of Geography Universitas Gadjah Mada 55281 Yogyakarta Indonesia

Mudi Field, Tuban is an oil and gas producing area in East Java. Pad B Mudi Field is an office area for the oil and gas industry. The oil and gas industrial office area in Pad B Mudi Field produces domestic wastewater, which is channeled into the Cangkring River. Domestic wastewater flows directly into rivers. This study aims to determine the water quality of the Cangkring River region, which is mixed with domestic wastewater from Pad B Mudi Field. Samples of river water were taken at 3 points along with the river flow. Sample evaluation included physical, chemical, and biological characteristics. Sample test results were adjusted according to domestic wastewater quality standards and water quality standards. Parameters tested include temperature, TSS, pH, BOD5, COD, ammonia (NH3), phosphate (PO43-), chromium, oils and fats, and total coliforms. The highest values of the three samples for each parameter were temperature of 20.8 °C, TSS of 13 mg/L, pH of 7.8, BOD5 of 6.53 mg/L, COD of 17.38 mg/L, ammonia (NH3) of 6.13 mg/L, phosphate (PO43-) of 1.15 mg/L, chromium of 0.01 mg/L, oils and fats of 1.6 mg/L, and total coliform of 2400/100 mL. The values of the three points of the Cangkring River water test results met all the parameters of the domestic wastewater quality standards. In testing water quality standards, Cangkring River water met all parameters of class 4 water quality standards, namely water quality that can be used to irrigate agriculture. So it can be concluded that the condition of the Cangkring River water is safe for the community but is not suitable for drinking water, recreational infrastructure, and aquaculture.

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