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The potency of hydrothermally prepared sulfated silica (SO4/SiO2) as a heterogeneous acid catalyst for ethanol dehydration into diethyl ether

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Chemosphere 2023年第1期341卷

作者： Pratika, Remi Ayu Wijaya, Karna Utami, Maisari Mulijani, Sri Patah, Aep Alarifi, Saud Ram Mani, Ravishankar Kumar Yadav, Krishna Ravindran, Balasubramani Chung, Woo Jin Chang, Soon Woong Munusamy-Ramanujam, Ganesh Study Program of Chemistry Faculty of Mathematics and Natural Sciences Universitas Palangka Raya Palangka Raya Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Gadjah Mada Yogyakarta55281 Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Islam Indonesia Yogyakarta55584 Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences Institut Pertanian Bogor Bogor Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Bandung Indonesia Department of Zoology College of Science King Saud University P.O. Box 2455 Riyadh11451 Saudi Arabia Department of Pharmaceutical Biology Faculty of Pharmaceutical Sciences UCSI University Cheras Taman Connaught Kuala Lumpur56000 Malaysia Faculty of Science and Technology Madhyanchal Professional University Ratibad Bhopal462044 India Environmental and Atmospheric Sciences Research Group Scientific Research Center Al-Ayen University Thi-Qar Nasiriyah 64001 Iraq Department of Environmental Energy and Engineering Kyonggi University Yeongtong-Gu Gyeonggi-Do Suwon16227 Korea Republic of Department of Medical Biotechnology and Integrative Physiology Institute of Biotechnology Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Thandalam Tamil Nadu Chennai602105 India Molecular Biology and Immunobiology Division Interdisciplinary Institute of Indian System of Medicine SRM-IST Tamil Nadu Kattankulathur603203 India

The dehydration of ethanol into diethyl ether over a SO4/SiO2 catalyst was investigated. The SO4/SiO2 catalysts were prepared by the sulfation method using 1, 2, and 3 M of sulfuric acid (SS1, SS2, and SS3) via hydrothermal treatment. This study is focused on the synthesis of a SO4/SiO2 catalyst with high total acidity that can be subsequently utilized to convert ethanol into diethyl ether. The total acidity test revealed that the sulfation process increased the total acidity of SiO2. The SS2 catalyst (with 2 M sulfuric acid) displayed the highest total acidity of 7.77 mmol/g, whereas the SiO2 total acidity was only 0.11 mmol/g. Meanwhile, the SS3 catalyst (with 3 M sulfuric acid) has a lower total acidity of 7.09 mmol/g due to the distribution of sulfate groups on the surface having reached its optimum condition. The crystallinity and structure of the SS2 catalyst were not affected by the hydrothermal treatment or the sulfate process on silica. Furthermore, The SS2 catalyst characteristics in the presence of sulfate lead to a flaky surface in the morphology and non-uniform particle size. In addition, the surface area and pore volume of the SS2 catalyst decreased (482.56–172.26 m2/g) and (0.297–0.253 cc/g), respectively, because of the presence of sulfate on the silica surface. The SS2 catalyst's pore shape information explains the formation of non-uniform pore sizes and shapes. Finally, the activity and selectivity of SO4/SiO2 catalysts in the conversion of ethanol to diethyl ether yielded the highest ethanol conversion of 70.01% and diethyl ether product of 9.05% from the SS2 catalyst (the catalyst with the highest total acidity). Variations in temperature reaction conditions (175–225 °C) show an optimum reaction temperature to produce diethyl ether at 200 °C (11.36%). © 2023 Elsevier Ltd

关键词： Silica

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Model Target of Food Production and Farmers’ Incomes in Banten Province, Indonesia

SSRN

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SSRN 2023年

作者： Siagian, Viktor Siregar, Hermanto Fariyanti, Anna Nainggolan, Kaman Haloho, Lermansius Hutapea, Ronald Suratman Salim, Zamroni Wamaer, Demas da Silva, Helena Ekaswati, Rini Rusdiana, Supardi Marwati, Tri Toha, Mohammad Sondakh, Joula Marpaung, Imelda Research Center for Macro Economic and Finance Research Organization for Governance Economy and Community Welfare National Research and Innovation Agency Jakarta12710 Indonesia IPB University Faculty of Economics and Management Bogor16680 Indonesia College of Management and Computer Science Nusa Mandiri Jakarta12540 Indonesia Research Center for Cooperative Corporation and People's Economy National Research and Innovation Agency Jakarta12710 Indonesia Universitas Islam Malang Indonesia Research Center for Behavioral and Circular Economics National Research and Innovation Agency Jakarta12710 Indonesia Research Center for Animal Research Organization for Agriculture and Food National Research and Innovation Agency Cibinong-Bogor 16128 Indonesia Research Center for Food and Technology Processing Research Organization for Agriculture and Food National Research and Innovation Agency Serpong15314 Indonesia Ph.D. Study Program Natural Resources and Environmental Management Graduate School of IPB University Campus IPB Baranangsiang Bogor16144 Indonesia National Research and Innovation Agency Indonesia

The area of the rice harvest in Banten Province in 2021 was 319,558 ha with a production of 1,63 million tons of unhusked rice or with a productivity of 5.1 tons/ha (CBS,2022). The objectives of this study were: 1) to optimize the target of rice and corn production in Banten Province, and 2) to optimize the target farmers' income in Banten Province. The study method used was a survey, with purposive sampling at the farmer level. Data were analyzed qualitatively (uses descriptive tabulation) and quantitatively (uses goal programming). The results of this study were:1) The target of rice production in the Banten Province of 2.1 million tons of unhusked rice can be achieved with the optimal area of irrigated paddy of 299,755.7 ha and the optimal area of field/dry land of 87,750.9 ha. The target for maize production of 1.75 million tonnes in Banten Province can be achieved with an optimal planting area of 342.211.7 ha of dry land. 2) The optimal area of food crops to achieve the farmer's income target in Banten Province in 2018 is IDR. 8.79 trillion comes from the planting area of lowland rice covering an area of 391,222.1 ha, the corn planting area of 169,059.9 ha, soybean planting area of 23,074.82 ha and cassava planting area of 2,832.77 ha. © 2023, The Authors. All rights reserved.

关键词： Agriculture

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Critical land mapping for the development of biomass-based energy in East Lombok Regency, Indonesia 1

Critical land mapping for the development of biomass-based e...

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1st International Conference on environmental Sciences, ICES 2018

作者： Narendra, B.H. Widiatmaka Kusmana, C. Karlinasari, L. Machfud Study Program of Natural Resource and Environmental Management IPB University Indonesia Department of Soil Science and Land Resources Faculty of Agriculture IPB University Indonesia Department of Silviculture Faculty of Forestry IPB University Indonesia Department of Agro-Industrial Technology Faculty of Agricultural Technology IPB University Indonesia Department of Forest Products Faculty of Forestry IPB University Indonesia Research Development and Innovation Agency Ministry of Environment and Forestry Indonesia

Utilization of critical land as woody biomass plantations need to be supported by information on the potential of critical land. The objective of this research was to delineate a critical land using remote sensing and GIS techniques combined with Analytical Hierarchy Process method. The parameters used were land use/cover, slope, rainfall erosivity, tolerable soil erosion, soil erodibility, land management, and land productivity. The Analytical Hierarchy Process method was used to provide the weight of each parameter. Land use/cover map was interpreted from SPOT-7 satellite imageries acquired in 2017. The other parameter maps were built based on reference maps, secondary and field data collection as well as soil sample analysis. The resulted map showed that 32.7% area of East Lombok Regency was categorized as a critical area. Based on the land status, the critical land area located in the State Forest was smaller (42%) than on the Area for Other Utilization (58%). Utilization of critical land as woody biomass plantation should be prioritized on the shrub-covered land using community forest scheme, while for the area of State Forest, the plantation can be only planted in the production forest area applying industrial plantation forest or community plantation forest scheme. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Erosion

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Revealing the potential of extracted Tamarindus indica seed as a biocoagulant for aquaculture wastewater treatment: Effect of solvent type, concentration, dose, and toxicity assessment

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Results in Engineering 2025年 27卷

作者： Setyo Budi Kurniawan Azzahra Aulia Haya Thin Soedarti Eko Prasetyo Kuncoro Łukasz Sługocki Kacper Nowakowski Peer Mohamed Abdul Muhammad Fauzul Imron Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia UKM Bangi Selangor 43600 Malaysia Research Center for Environment and Clean Technology National Research and Innovation Agency (BRIN) Jakarta Pusat 10340 Indonesia Study Program of Environmental Engineering Department of Biology Faculty of Science and Technology Universitas Airlangga Campus C UNAIR Jalan Mulyorejo Surabaya 60115 Indonesia Department of Biology Faculty of Science and Technology Universitas Airlangga Campus C UNAIR Jalan Mulyorejo Surabaya 60115 Indonesia Department of Hydrobiology Institute of Biology University of Szczecin Wąska 13 Szczecin 71-715 Poland Center of Molecular Biology and Biotechnology University of Szczecin Wąska 13 Szczecin 71-715 Poland Sanitary Engineering Section Department of Water Management Faculty of Civil Engineering and Geosciences Delft University of Technology Stevinweg 1 CN Delft 2628 The Netherlands

Aquaculture wastewater contains high levels of organic matter and nutrients, which can be harmful to aquatic life if discharged improperly into surface water bodies. Coagulation-flocculation is currently the best practice for treating aquaculture effluent with biocoagulants, offering an alternative to metal-based coagulants. This study aims to investigate the potential of Tamarindus indica seeds as a biocoagulant for treating aquaculture wastewater, focusing on the optimal solvent extraction, concentration, and dose. This study also examines the toxicity of biocoagulants to aquatic organisms. Coagulation-flocculation study was conducted under jar test experiment with NaCl, NaOH, and HCl used as solvents; concentration of 0-10 g/L; and doses of 1-5 % v/v under 120 rpm (rotation per minute) rapid mixing for 1 min, 20 rpm slow mixing for 20 mins, and 60 mins sedimentation time. A characterization study showed that NaCl-treated T. indica has a positive zeta potential charge, attributed to the presence of hydroxyl, carbonyl, and amide functional groups. Under this optimum condition (NaCl-extract, 6 g/L, and 4 % v/v), the biocoagulant achieved high removal (>50 %) of turbidity, TSS (total suspended solid), and ammonia and considerably good removal of other parameters (TN [total nitrogen], BOD 5 [biological oxygen demand], COD [chemical oxygen demand]). The toxicity test revealed that no mortality was observed at a concentration of 1 g/L, whereas 10 g/L resulted in a 100 % mortality rate after 24 hours of exposure. Further toxicity analysis is suggested to be conducted using treated final effluent (not directly using biocoagulant substances) to observe the direct impact of the treated wastewater if discharged into the water bodies.

关键词： Aquaculture Biocoagulant Coagulation Effluent environmental pollution Flocculation

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Should workers be physically active after work?Associations of leisure-time physical activity with cardiovascular and all-cause mortality across occupational physical activity levels-An individual participant data meta-analysis

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Journal of Sport and Health Science 2025年第1期14卷 49-60页

作者： Bart Cillekens Pieter Coenen Maaike A.Huysmans Andreas Holtermann Richard P.Troiano Paul Jarle Mork Steinar Krokstad Els Clays Dirk De Bacquer Mette Aadahl Line Lund Kårhus Anette Sjøl Lars Bo Andersen Jussi Kauhanen Ari Voutilainen Richard Pulsford Emmanuel Stamatakis Uri Goldbourt Annette Peters Barbara Thorand Annika Rosengren Lena Björck Kyle Sprow Kristin Franzon Miguel Rodriguez-Barranco Leila Luján-Barroso Lars Alfredsson Martin Bahls Till Ittermann Miriam Wanner Matthias Bopp Jacob Louis Marott Peter Schnohr Børge G.Nordestgaarda Knut Eirik Dalene Ulf Ekelund Johan Clausen Magnus T.Jensen Christina Bjørk Petersen Niklas Krause Jos Twisk Willem van Mechelen Allard J.van der Beek Department of Public and Occupational Health Amsterdam Public Health Research InstituteVrije Universiteit AmsterdamAmsterdam UMCAmsterdam 1081 HVthe Netherlands National Research Centre for the Working Environment Copenhagen 2100Denmark Department of Sports Science and Clinical Biomechanics University of Southern DenmarkOdense 5230Denmark U.S.Public Health Service ArlingtonVA 22201USA Department of Public Health and Nursing Norwegian University of Science and TechnologyTrondheim 8905Norway Levanger Hospital Nord-Trøndelag Hospital TrustLevanger 7601Norway Department of Public Health and Primary Care Ghent UniversityGhent 9000Belgium Center for Clinical Research and Prevention Bispebjerg and Frederiksberg HospitalFrederiksberg 2000Denmark The Capital Region of Denmark Copenhagen 1172Denmark Western Norway University of Applied Sciences Faculty of EducationArts and SportsSogndal 5414Norway Institute of Public Health and Clinical Nutrition University of Eastern FinlandKuopio 1627Finland Faculty of Health and Life Sciences University of ExeterExeter EX12LUUK Mackenzie Wearables Research Hub Charles Perkins CentreThe University of SydneyNSW 2050Australia School of Health Sciences Faculty of Medicine and HealthThe University of SydneyNSW 2050Australia Sackler Medical faculty in Tel Aviv University Tel Aviv 6997801Israel Institute of Epidemiology Helmholtz Zentrum MünchenGerman Research Center for Environmental HealthNeuherberg 85764Germany German Centre for Cardiovascular Research(DZHK e.V.) partner site Munich Heart AllianceMunich 80636Germany Institute for Medical Information Processing Biometryand Epidemiology(IBE)Pettenkofer School of Public HealthFaculty of MedicineLudwig-Maximilians-UniversitätMunich 80636Germany Institute of Medicine Department of Molecular and Clinical MedicineSahlgrenska AcademyUniversity of GothenburgGothenburg 40530Sweden Region Västra Götaland Sahlgrenska University HospitalDepartment of Medicine Geriatrics and Emergency Medicine/ÖstraGothenb

Background There is insufficient evidence to provide recommendations for leisure-time physical activity among workers across various occupational physical activity *** study aimed to assess the association of leisure-time physical activity with cardiovascular and all-cause mortality across occupational physical activity *** This study utilized individual participant data from 21 cohort studies,comprising both published and unpublished *** criteria included individual-level data on leisure-time and occupational physical activity(categorized as sedentary,low,moderate,and high)along with data on all-cause and/or cardiovascular mortality.A 2-stage individual participant data meta-analysis was conducted,with separate analysis of each study using Cox proportional hazards models(Stage 1).These results were combined using random-effects models(Stage 2).Results Higher leisure-time physical activity levels were associated with lower all-cause and cardiovascular mortality risk across most occupational physical activity levels,for both males and *** males with sedentary work,high compared to sedentary leisure-time physical activity was associated with lower all-cause(hazard ratios(HR)=0.77,95%confidence interval(95%CI):0.70-0.85)and cardiovascular mortality(HR=0.76,95%CI:0.66-0.87)*** males with high levels of occupational physical activity,high compared to sedentary leisure-time physical activity was associated with lower all-cause(HR=0.84,95%CI:0.74-0.97)and cardiovascular mortality(HR=0.79,95%CI:0.60-1.04)risk,while HRs for low and moderate levels of leisure-time physical activity ranged between 0.87 and 0.97 and were not statistically *** females,most effects were similar but more imprecise,especially in the higher occupational physical activity *** Higher levels of leisure-time physical activity were generally associated with lower mortality ***,results for workers with moderate and high

关键词： Mortality Individual participant data Physical activity paradox Job demands

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Cellulose in natural flocculant applications: A review

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Journal of Physics: Conference Series 2021年第1期2047卷

作者： D Fauzani S Notodarmojo M Handajani Q Helmy T Kardiansyah Environmental Engineering Doctoral Study Program Bandung Institute of Technology Jalan Ganesa No. 10 Bandung West Java 40132 Indonesia Department of Environmental Engineering Bandung Institute of Technology Jalan Ganesa No. 10 Bandung West Java 40132 Indonesia Center for Pulp and Paper The Ministry of Industry Republic of Indonesia Jalan Raya Dayeuhkolot No. 132 Bandung West Java 40258 Indonesia

Natural polymeric flocculants have gained popularity in water and wastewater treatment in recent years due to their non-toxicity and biodegradability. Because of its broad availability, renewability, sustainability, and surface modification potential, cellulose is regarded as one of the foundation polymers for flocculant production and modification. The following literature review includes of an overview of coagulation-flocculation, which is the process mechanism consisting of colloid destabilization for coagulation, followed by bridging, charge neutralization, and electrostatic patch for flocculation; aspects affecting the coagulation-flocculation performance; as well as the types of coagulants and flocculants that are commonly used. Furthermore, we will go over the physical and chemical properties of flocculants, as well as their usage as a coagulant-aid in the flocculation process following coagulation and as a flocculant in direct flocculation. There is also a discussion of the most recent advances in biopolymers, which are natural materials used to alter biopolymers as flocculants such as chitosan, tannins, starch, and cellulose. Whereas there is a review of the cellulose modifications that have been performed in past research to make it a natural flocculant, the use of ramie cellulose as flocculants has never been carried out to be used as a coagulant-aid and/or flocculant in drinking water and wastewater treatment. Ramie cellulose as backbone of biomaterial composites are expected to be applied as flocculants, have good flocculation performance, and can facilitate sludge handling in water treatment plants and/or wastewater treatment plants.

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Scientific discovery in the age of artificial intelligence

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NATURE 2023年第7978期621卷 E33-E33页

作者： Wang, Hanchen Fu, Tianfan Du, Yuanqi Gao, Wenhao Huang, Kexin Liu, Ziming Chandak, Payal Liu, Shengchao Van Katwyk, Peter Deac, Andreea Anandkumar, Anima Bergen, Karianne Gomes, Carla P. Ho, Shirley Kohli, Pushmeet Lasenby, Joan Leskovec, Jure Liu, Tie-Yan Manrai, Arjun Marks, Debora Ramsundar, Bharath Song, Le Sun, Jimeng Tang, Jian Velickovic, Petar Welling, Max Zhang, Linfeng Coley, Connor W. Bengio, Yoshua Zitnik, Marinka Department of Engineering University of Cambridge Cambridge UK Department of Computing and Mathematical Sciences California Institute of Technology Pasadena CA USA NVIDIA Santa Clara CA USA Department of Computational Science and Engineering Georgia Institute of Technology Atlanta GA USA Department of Computer Science Cornell University Ithaca NY USA Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Department of Computer Science Stanford University Stanford CA USA Department of Physics Massachusetts Institute of Technology Cambridge MA USA Harvard-MIT Program in Health Sciences and Technology Cambridge MA USA Mila – Quebec AI Institute Montreal Quebec Canada Université de Montréal Montreal Quebec Canada HEC Montréal Montreal Quebec Canada CIFAR AI Chair Toronto Ontario Canada Department of Earth Environmental and Planetary Sciences Brown University Providence RI USA Data Science Institute Brown University Providence RI USA Center for Computational Astrophysics Flatiron Institute New York NY USA Department of Astrophysical Sciences Princeton University Princeton NJ USA Department of Physics Carnegie Mellon University Pittsburgh PA USA Department of Physics and Center for Data Science New York University New York NY USA Google DeepMind London UK Department of Computer Science and Technology University of Cambridge Cambridge UK Microsoft Research Beijing China Department of Biomedical Informatics Harvard Medical School Boston MA USA Broad Institute of MIT and Harvard Cambridge MA USA Harvard Data Science Initiative Cambridge MA USA Kempner Institute for the Study of Natural and Artificial Intelligence Harvard University Cambridge MA USA Department of Systems Biology Harvard Medical School Boston MA USA Deep Forest Sciences Palo Alto CA USA BioMap Beijing China Mo

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Concrete Brick Production Using a Mixture of Paint Waste by Solidification Process

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IOP Conference Series: Materials Science and Engineering 2021年第1期1053卷

作者： P Purwanto S Sudarno A D P Citra Green Technology Research Center School of Postgraduate Studies Universitas Diponegoro Semarang Indonesia Department of Chemical Engineering Faculty of Engineering Universitas Diponegoro Semarang Indonesia Department of Environmental Engineering Faculty of Engineering Universitas Diponegoro Semarang Indonesia Study Program of Optometry Universitas Widya Husada Semarang Semarang Indonesia

Unutilized hazardous and toxic waste requires management and landfill costs. Hazardous and toxic paint waste can be used as additional raw material to make brick products through solidification. Concrete bricks are made from a mixture of cement (1 part) and sand (14 parts) with the addition of water for mixing purpose. The mixture composition is 0,1,2,4,6, and 8% by using paint waste as the raw material added. Then, the quality of concrete brick products is tested on compressive strength and water permeability. The test results can be used as recommendations for the use of paint waste into products and reduce waste management costs.

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A Benchmark Model for Predicting Building Energy and Daylight Performance in The Early Phase of Design Utilizing Parametric Design Exploration

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IOP Conference Series: Earth and environmental Science 2021年第1期830卷

作者： Rendy Perdana Khidmat Hiroatsu Fukuda Kustiani Andi Prasetiyo Wibowo Fukuda Laboratory Graduate School of Environmental Engineering The University of Kitakyushu Kitakyushu Japan Architecture Study Program Department of Infrastructure and Regional Technology Institut Teknologi Sumatera Lampung Indonesia Department of Architecture Faculty of Engineering Bandar Lampung University Lampung Indonesia. Department of Architecture Universitas Atma Jaya Yogyakarta Yogyakarta Indonesia.

Along with the enormous impact on computational development in architecture and urban design, the way in approaching the built environment is shifting and intended to look closer to performance and evidence-based design. This development holds promise in handling complex computation to approach desired targeted design goals. However, the implementation of form-finding and design performance optimization still lacks, particularly in Japan's sub-tropical climate. This paper describes the parametric design and design exploration process's implementation through the generative algorithm platform to develop a benchmark model to predict building energy and daylight performance and find possible design solutions from the iteration process during the early phase of the design process. The variables incorporated related to the glazing ratio, the length of the overhang, and building orientation. Grasshopper, a parametric-based plugin that works in Rhinoceros, is used to arrange a parametric definition for the overall experiment. The tools used to investigate the environmental analysis and energy consumption are Ladybug and Honeybee, and the exploration process will be conducted using Design Explorer. The context will be situated in Orio district and uses the EPW file of Kitakyushu city, Fukuoka, Japan. The results of this research furthermore can potentially be a comparison for more dynamic factors.

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Effort of utilizing foundry sand waste and paper sludge as raw materials replacement for red brand without burning process

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IOP Conference Series: Earth and environmental Science 2019年第1期259卷

作者： S E D F S Wati T W C Putranto N Citrasari Environmental Science and Technology Study Program Biology Department Faculty of Science and Technology Universitas Airlangga Surabaya Indonesia

This research's goal is to know the content of SiO2 and Al2O3 in the foundry sand, to know the selected variation as material for red brick without burning process based on SNI 15-2094-2000 on concrete red brick for walls and SNI 15-2094-1991 on the quality and the test method for concrete red brick and to know the content of heavy metal Zn from leaching process of the selected variations. The content of SiO2 and Al2O3 were tested by using X-Ray Fluorescence method, while the content of Zn at leached was tested by using Atomic Abrsoption Spectophotometry. The non-burning brick quality test was conducted in 5 stages, which are external display test, size and tolerance test, compressive strength test, harmful salt test, pseudo-density test and water absorption test. Variations of materials used are foundry sand: paper sludge: compactor ingredient in percentage is Variation A 75%:15%:10%; B 65%:25%:10%; C 55%:35%:10%; D 45%:45%:10%; E 0%:90%:10%; F 90%:0%:10%; and the Control Variation is G 90% sand:10%. The content of SiO2 and Al2O3 in the foundry sand are respectively 66.90% and 12.78%. The content of Zn in paper sludge is 54 mg/kg. The results of red brick testing shows that the selected variations are variations A, B, F which classified to Brick classs 50. Content of Zn in red brick leaching process of the selected variations are variations A, B, and F are respectively 0.61; 0.89; 0.21 mg/L.

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