Pub Date : 2024-07-15DOI: 10.51316/jst.175.etsd.2024.34.3.5
T. N. Duy, K. Duc, Truc Nguyen The
Bio-ethanol, one of the most popular alternative fuels, has been applied widely in the world to replace conventional fuel in internal combustion engines, especially in spark ignition engines. Bio-ethanol fuel is characterized by higher heat of vaporization value and low Reid vapor pressure in comparison with conventional gasoline fuel. These properties contribute to the lower temperature of the intake mixture and less effective mixture formation, which then affect engine performance, especially at cold starting and idling conditions. In this study, an electric-based heating system (EHS) was designed to increase intake air temperature, enhancing cold starting ability and idling stability. The experimental results show that, with the EHS, the cold start ability of the testing engine improves remarkably at low ambient temperature conditions. In addition, the cold idling speed of the test engine in the case of using EHS is more stable than the case without the system.
{"title":"Electric-Based Heating System for Cold Start and Idling Performances Enhancement of Carburetor Engine Fueled with Bio-Ethanol","authors":"T. N. Duy, K. Duc, Truc Nguyen The","doi":"10.51316/jst.175.etsd.2024.34.3.5","DOIUrl":"https://doi.org/10.51316/jst.175.etsd.2024.34.3.5","url":null,"abstract":"Bio-ethanol, one of the most popular alternative fuels, has been applied widely in the world to replace conventional fuel in internal combustion engines, especially in spark ignition engines. Bio-ethanol fuel is characterized by higher heat of vaporization value and low Reid vapor pressure in comparison with conventional gasoline fuel. These properties contribute to the lower temperature of the intake mixture and less effective mixture formation, which then affect engine performance, especially at cold starting and idling conditions. In this study, an electric-based heating system (EHS) was designed to increase intake air temperature, enhancing cold starting ability and idling stability. The experimental results show that, with the EHS, the cold start ability of the testing engine improves remarkably at low ambient temperature conditions. In addition, the cold idling speed of the test engine in the case of using EHS is more stable than the case without the system.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":" 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833410","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 : 2024-07-15DOI: 10.51316/jst.175.etsd.2024.34.3.7
Bui Van Huan, Le Khanh
Diabetes is a dangerous chronic disease and often causes foot complications. Foot ulcers are a dangerous complication in patients with diabetes and lead to the risk of amputation. Shoes for diabetic patients play an important role in reducing the risk of foot ulcers. Therefore, diabetic patients need to use their own footwear, designed on the basis of anthropometric research and assessment of their foot complications. The article presents the method and results of measuring the feet and evaluating thier complications of 332 male diabetic patients over the age of 40. The patients' feet were measured at Khoai Chau district medical center, Hung Yen province and at National Hospital of Endocrinology. The results showed that diabetic foot complications in men with diabetes tend to get worse over time of illness. Foot complications/pathologies are the cause of differences in measurements of height, width and circumference of male diabetic foot. This difference was independent of the patient's age. According to foot complications, about 97.2% of male patients need to use “Extra Depth Diabetic Shoes”; 21.8% of patients required “Custom Molded Inlays/insoles”; and 3.2% of patients required “Custom Molded Diabetic Shoes” and “Custom Molded Inlays”.
{"title":"Research on the Feet of Men with Diabetes as a Basis for Designing Shoes and Insoles","authors":"Bui Van Huan, Le Khanh","doi":"10.51316/jst.175.etsd.2024.34.3.7","DOIUrl":"https://doi.org/10.51316/jst.175.etsd.2024.34.3.7","url":null,"abstract":"Diabetes is a dangerous chronic disease and often causes foot complications. Foot ulcers are a dangerous complication in patients with diabetes and lead to the risk of amputation. Shoes for diabetic patients play an important role in reducing the risk of foot ulcers. Therefore, diabetic patients need to use their own footwear, designed on the basis of anthropometric research and assessment of their foot complications. The article presents the method and results of measuring the feet and evaluating thier complications of 332 male diabetic patients over the age of 40. The patients' feet were measured at Khoai Chau district medical center, Hung Yen province and at National Hospital of Endocrinology. The results showed that diabetic foot complications in men with diabetes tend to get worse over time of illness. Foot complications/pathologies are the cause of differences in measurements of height, width and circumference of male diabetic foot. This difference was independent of the patient's age. According to foot complications, about 97.2% of male patients need to use “Extra Depth Diabetic Shoes”; 21.8% of patients required “Custom Molded Inlays/insoles”; and 3.2% of patients required “Custom Molded Diabetic Shoes” and “Custom Molded Inlays”.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":" 27","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833481","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 : 2024-07-15DOI: 10.51316/jst.175.etsd.2024.34.3.6
Van Tuyen Vu, V. D. Duong, Ich Long Ngo
The paper describes an investigation of the dynamic behaviors of the fluid flow through tandem circular cylinders with a middle flat plate. A low Reynold number of 100, which originated from appropriate applications, is considered. The Lattice Boltzmann Method is used and implemented in the Direct Numerical Simulation. The numerical model was well-validated by comparing results from the literature for either a single circular cylinder or two tandem cylinders without flat plates. Consequently, the dynamic behavior of the fluid flow through tandem circular cylinders with a middle flat plate is first revealed in this study. The numerical results show that these behaviors are affected significantly by the presence of the middle flat plate. Moreover, the pattern of vortex formation is also affected considerably when this flat plate is mounted between two cylinders, and this pattern changes at the threshold value of plate size. Hydrodynamic coefficients and the Strouhal number generally decrease with the increase in flat plate size. These results are very useful in reducing the losses caused by vortex formation and increasing the fatigue durability in potential applications, such as ocean engineering and civil engineering.
{"title":"Numerical Simulation of the Low-Reynold Flow through Tandem Circular Cylinders with the Middle Flat Plate","authors":"Van Tuyen Vu, V. D. Duong, Ich Long Ngo","doi":"10.51316/jst.175.etsd.2024.34.3.6","DOIUrl":"https://doi.org/10.51316/jst.175.etsd.2024.34.3.6","url":null,"abstract":"The paper describes an investigation of the dynamic behaviors of the fluid flow through tandem circular cylinders with a middle flat plate. A low Reynold number of 100, which originated from appropriate applications, is considered. The Lattice Boltzmann Method is used and implemented in the Direct Numerical Simulation. The numerical model was well-validated by comparing results from the literature for either a single circular cylinder or two tandem cylinders without flat plates. Consequently, the dynamic behavior of the fluid flow through tandem circular cylinders with a middle flat plate is first revealed in this study. The numerical results show that these behaviors are affected significantly by the presence of the middle flat plate. Moreover, the pattern of vortex formation is also affected considerably when this flat plate is mounted between two cylinders, and this pattern changes at the threshold value of plate size. Hydrodynamic coefficients and the Strouhal number generally decrease with the increase in flat plate size. These results are very useful in reducing the losses caused by vortex formation and increasing the fatigue durability in potential applications, such as ocean engineering and civil engineering.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":" 39","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141832649","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 : 2024-07-15DOI: 10.51316/jst.175.etsd.2024.34.3.4
Nguyen Thi, V. Thanh, Dang Thanh, Tung
Gnetum montanum Markgr.(Gnetaceae), Vietnamese name as Day gam, Gam nui is a creeping and turning wood, distributed in natural forests at altitudes of 200-1200 m. It grows widely in mountain areas in Vietnam. Its stem can disinfect, eliminate rheumatism, eliminate toxins in the body, and support the treatment of inflammation, blood disorders, leprosy, or joint pain in traditional medicine. In the course of study on the chemical composition of Gnetum montanum Markgr. in Vietnam, this paper described the extraction and structure evaluation of four compounds, including lehmbachol D (1), 3,4,5-trimethoxy-stilbene-10,14-diol (2), gnetucleistol C (3) and (+)-pinoresinol (4). The stems of this plant were collected, identified, dried and extracted in different polarity solvents. These substances were isolated from the ethyl acetate of methanol extract on the basis of column chromatography combined with thin layer chromatography. Their structures were identified based on spectroscopic evaluation and comparison of corresponding authentic compounds. Compound 2 was firstly reported on the paper.
{"title":"Some Chemical Components from Gnetum montanum Markgr. in Vietnam","authors":"Nguyen Thi, V. Thanh, Dang Thanh, Tung","doi":"10.51316/jst.175.etsd.2024.34.3.4","DOIUrl":"https://doi.org/10.51316/jst.175.etsd.2024.34.3.4","url":null,"abstract":"Gnetum montanum Markgr.(Gnetaceae), Vietnamese name as Day gam, Gam nui is a creeping and turning wood, distributed in natural forests at altitudes of 200-1200 m. It grows widely in mountain areas in Vietnam. Its stem can disinfect, eliminate rheumatism, eliminate toxins in the body, and support the treatment of inflammation, blood disorders, leprosy, or joint pain in traditional medicine. In the course of study on the chemical composition of Gnetum montanum Markgr. in Vietnam, this paper described the extraction and structure evaluation of four compounds, including lehmbachol D (1), 3,4,5-trimethoxy-stilbene-10,14-diol (2), gnetucleistol C (3) and (+)-pinoresinol (4). The stems of this plant were collected, identified, dried and extracted in different polarity solvents. These substances were isolated from the ethyl acetate of methanol extract on the basis of column chromatography combined with thin layer chromatography. Their structures were identified based on spectroscopic evaluation and comparison of corresponding authentic compounds. Compound 2 was firstly reported on the paper.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":" 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833291","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 : 2024-07-15DOI: 10.51316/jst.175.etsd.2024.34.3.8
Tran Thi Huong, Ngo Thuy, Pham Thi Anh Dung, Tu
Efficient reverse logistics management not only reduces costs but also plays a crucial role in creating added value for businesses and protecting the environment. The objective of this study is to explore and classify barriers and then prioritize them based on their importance using pairwise comparison methods. To this end, a two-stage mixed-methods research design was employed. The initial qualitative stage involved a comprehensive literature review to identify key themes and categorize them into five main barrier groups: government, organization and management methods, coordination in supply chain, finance and economics, and infrastructure. The subsequent quantitative stage utilized the Analytical Hierarchy Process (AHP) and Relative Importance Index (RII) to analyze and prioritize the specific barriers within these groups. The results show that the unclear organizational structure for reverse logistics activities, the lack of mechanisms and support from the government, and a lack of coordination from customers are the biggest barriers. This paper proposed solutions for the government and e-commerce businesses to eliminate barriers and operate efficiently reverse logistics systems.
{"title":"Analyzing Barriers to Reverse Logistics Systems for E-Commerce in Vietnam","authors":"Tran Thi Huong, Ngo Thuy, Pham Thi Anh Dung, Tu","doi":"10.51316/jst.175.etsd.2024.34.3.8","DOIUrl":"https://doi.org/10.51316/jst.175.etsd.2024.34.3.8","url":null,"abstract":"Efficient reverse logistics management not only reduces costs but also plays a crucial role in creating added value for businesses and protecting the environment. The objective of this study is to explore and classify barriers and then prioritize them based on their importance using pairwise comparison methods. To this end, a two-stage mixed-methods research design was employed. The initial qualitative stage involved a comprehensive literature review to identify key themes and categorize them into five main barrier groups: government, organization and management methods, coordination in supply chain, finance and economics, and infrastructure. The subsequent quantitative stage utilized the Analytical Hierarchy Process (AHP) and Relative Importance Index (RII) to analyze and prioritize the specific barriers within these groups. The results show that the unclear organizational structure for reverse logistics activities, the lack of mechanisms and support from the government, and a lack of coordination from customers are the biggest barriers. This paper proposed solutions for the government and e-commerce businesses to eliminate barriers and operate efficiently reverse logistics systems.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":" 32","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141832959","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 : 2024-07-15DOI: 10.51316/jst.175.etsd.2024.34.3.3
Duong Thi Hong, Bui Thi Ngoc, Bich, Van Dinh, Son Tho, Nguyen Nhat Trinh, Dang Trung Dung
Wastewater from the dyeing process is causing serious issues for the ecosystem and humans. Zero-valent iron nanoparticles have been proven as a promising material for environmental treatment through numerous previous studies. In this research, green-synthesized zero-valent iron nanoparticles were obtained from the leaf extract of the Cleistocalyx operculatus. These nanoparticles were then applied onto polyester non-woven fabric with alginate coating on the fabric surface. The polyester nonwoven fabric used in this study was (poly ethylene terephthalate) (PET) needle-punched non-woven fabric. The modified polyester non-woven fabric with alginate and zero-valent iron nanoparticles (PET/Alginate/nZVI), alginate-coated polyester non-woven fabric (PET/Alginate), and the original polyester non-woven fabric (PET) were evaluated for morphology and structure using scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR). The capability of removing the organic dye Rhodamine B was assessed through UV-Vis spectroscopy. The influence of iron dosage, solution concentration, and solution pH on the dye removal capacity of the material was investigated. Results show that the material has been successfully synthesized for high-performance removal of Rhodamine B dye with an efficiency of 98% after 10 minutes of treatment, and it can be reused multiple times with an efficiency of over 70%.
染色过程中产生的废水给生态系统和人类带来了严重问题。零价纳米铁颗粒作为一种有前景的环境治理材料，已在以往的大量研究中得到证实。在这项研究中，从 Cleistocalyx operculatus 的叶片提取物中获得了绿色合成的零价铁纳米粒子。然后将这些纳米颗粒涂抹在聚酯无纺布上，并在织物表面涂抹海藻酸盐。本研究使用的聚酯无纺布是（聚对苯二甲酸乙二酯）（PET）针刺无纺布。使用扫描电子显微镜（SEM）和傅立叶变换红外光谱（FTIR）对海藻酸盐和零价铁纳米颗粒改性聚酯无纺布（PET/海藻酸盐/nZVI）、海藻酸盐涂层聚酯无纺布（PET/海藻酸盐）和原始聚酯无纺布（PET）的形态和结构进行了评估。通过紫外可见光谱评估了去除有机染料罗丹明 B 的能力。研究了铁用量、溶液浓度和溶液 pH 值对材料去除染料能力的影响。结果表明，该材料已成功合成，可高效去除罗丹明 B 染料，处理 10 分钟后去除率达 98%，而且可多次重复使用，去除率超过 70%。
{"title":"\"Synthesis of Zero-Valent Iron Nanoparticles on Polyester Non-Woven Fabric Using Green Chemistry Method for Wastewater Treatment in the Textile Dyeing Industry\"","authors":"Duong Thi Hong, Bui Thi Ngoc, Bich, Van Dinh, Son Tho, Nguyen Nhat Trinh, Dang Trung Dung","doi":"10.51316/jst.175.etsd.2024.34.3.3","DOIUrl":"https://doi.org/10.51316/jst.175.etsd.2024.34.3.3","url":null,"abstract":"Wastewater from the dyeing process is causing serious issues for the ecosystem and humans. Zero-valent iron nanoparticles have been proven as a promising material for environmental treatment through numerous previous studies. In this research, green-synthesized zero-valent iron nanoparticles were obtained from the leaf extract of the Cleistocalyx operculatus. These nanoparticles were then applied onto polyester non-woven fabric with alginate coating on the fabric surface. The polyester nonwoven fabric used in this study was (poly ethylene terephthalate) (PET) needle-punched non-woven fabric. The modified polyester non-woven fabric with alginate and zero-valent iron nanoparticles (PET/Alginate/nZVI), alginate-coated polyester non-woven fabric (PET/Alginate), and the original polyester non-woven fabric (PET) were evaluated for morphology and structure using scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR). The capability of removing the organic dye Rhodamine B was assessed through UV-Vis spectroscopy. The influence of iron dosage, solution concentration, and solution pH on the dye removal capacity of the material was investigated. Results show that the material has been successfully synthesized for high-performance removal of Rhodamine B dye with an efficiency of 98% after 10 minutes of treatment, and it can be reused multiple times with an efficiency of over 70%.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":" 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141832970","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 : 2024-07-15DOI: 10.51316/jst.175.etsd.2024.34.3.1
Thi To, Nga Phan, Thi Thu, Huyen Nguyen
GdFeO3-incoporated zeolite (GFO/Z) was successfully prepared by the impregnation method followed by the calcination process and used for adsorption and photo-Fenton degradation of Congo Red (CR). The as-prepared GFO/Z material was characterized by X-ray Diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) surface area, and optical absorption spectra (UV-Vis). The large specific surface area and accessible pores supported its high performance towards the adsorption of CR . Besides, due to its low band gap energy, the photo-Fenton catalytic activities of GFO/Z were also investigated for the degradation of CR under visible light irradiation. The use of GFO/Z led to a high removal rate (97.46%) of CR thanks to the synergistic effect between effective dark adsorption and visible-light-driven Fenton degradation, which was greater than those of pure GFO. Scavenger experiments were performed to reveal that the hydroxyl radicals (•OH) were the main active species in the photo-Fenton catalytic process. This work showed a promising application of GFO/Z in the degradation of organic compounds in wastewater.
{"title":"Adsorptive Removal and Photo-Fenton Degradation of Congo Red Dye from Water Using Modified Gadolinium Orthoferrite","authors":"Thi To, Nga Phan, Thi Thu, Huyen Nguyen","doi":"10.51316/jst.175.etsd.2024.34.3.1","DOIUrl":"https://doi.org/10.51316/jst.175.etsd.2024.34.3.1","url":null,"abstract":"GdFeO3-incoporated zeolite (GFO/Z) was successfully prepared by the impregnation method followed by the calcination process and used for adsorption and photo-Fenton degradation of Congo Red (CR). The as-prepared GFO/Z material was characterized by X-ray Diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) surface area, and optical absorption spectra (UV-Vis). The large specific surface area and accessible pores supported its high performance towards the adsorption of CR . Besides, due to its low band gap energy, the photo-Fenton catalytic activities of GFO/Z were also investigated for the degradation of CR under visible light irradiation. The use of GFO/Z led to a high removal rate (97.46%) of CR thanks to the synergistic effect between effective dark adsorption and visible-light-driven Fenton degradation, which was greater than those of pure GFO. Scavenger experiments were performed to reveal that the hydroxyl radicals (•OH) were the main active species in the photo-Fenton catalytic process. This work showed a promising application of GFO/Z in the degradation of organic compounds in wastewater.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":" 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141832979","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 : 2024-07-15DOI: 10.51316/jst.175.etsd.2024.34.3.2
Nguyen Thu, Huong, Võ Linh, Nguyen Ngoc, Thinh, Le Dieu, Tran Thi, Thu Huyền, N. Viet, Le Van Dung, Tran Vinh Hoang, Vu Anh, Tuan
Recently, antibiotic pollution has been recognized as an aquatic environmental pollution, due to its potential adverse effects on ecosystems and human health. Therefore, it is necessary to have an effective and environmentally friendly method to remove antibiotic residues in the aquatic environment. In this study, Graphene oxide (GO) was synthesized for the treatment of antibiotic residues in the aquatic environment. The characteristics of GO material were analyzed by the X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Transmission electron microscopy (TEM, JEM-JEOL 2100) methods. The GO material was used for the adsorption of tetracycline hydrochloride (TCH) in an aqueous environment. The adsorption equilibration time is 30 min and an efficiency of approximately 88.57% with an initial TCH concentration of 20 mg/L. The factors that affect the adsorption process were investigated including the initial TCH concentration (10 to 40 mg/L), the GO dosage (0.1 to 0.5 g/L), and the pH solution (1 to 9). The adsorption process of TCH on GO material is consistent with the Freundlich isotherm model with a maximum adsorption capacity of 65.65 mg/g. The TCH adsorption process of GO material is exothermic.
{"title":"Fabrication of Graphene Oxide for Application in Removing Tetracycline Hydrochloride in Aqueous Solution","authors":"Nguyen Thu, Huong, Võ Linh, Nguyen Ngoc, Thinh, Le Dieu, Tran Thi, Thu Huyền, N. Viet, Le Van Dung, Tran Vinh Hoang, Vu Anh, Tuan","doi":"10.51316/jst.175.etsd.2024.34.3.2","DOIUrl":"https://doi.org/10.51316/jst.175.etsd.2024.34.3.2","url":null,"abstract":"Recently, antibiotic pollution has been recognized as an aquatic environmental pollution, due to its potential adverse effects on ecosystems and human health. Therefore, it is necessary to have an effective and environmentally friendly method to remove antibiotic residues in the aquatic environment. In this study, Graphene oxide (GO) was synthesized for the treatment of antibiotic residues in the aquatic environment. The characteristics of GO material were analyzed by the X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Transmission electron microscopy (TEM, JEM-JEOL 2100) methods. The GO material was used for the adsorption of tetracycline hydrochloride (TCH) in an aqueous environment. The adsorption equilibration time is 30 min and an efficiency of approximately 88.57% with an initial TCH concentration of 20 mg/L. The factors that affect the adsorption process were investigated including the initial TCH concentration (10 to 40 mg/L), the GO dosage (0.1 to 0.5 g/L), and the pH solution (1 to 9). The adsorption process of TCH on GO material is consistent with the Freundlich isotherm model with a maximum adsorption capacity of 65.65 mg/g. The TCH adsorption process of GO material is exothermic.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":" 37","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141833380","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 : 2024-03-15DOI: 10.51316/jst.172.etsd.2024.34.1.5
Ta Dinh Quang, Vuong Thanh Huyen, Le Minh Thang
The 1wt%CuO – 6CeO2 – 4ZrO2 catalysts were synthesized by sol-gel method with two different procedures: (i) impregnating CuO on CeO2-ZrO2 support (CuO/CeO2-ZrO2), (ii) sol-gel of the Cu, Ce and Zr precursor together (CuO-CeO2-ZrO2). These catalysts were applied for the preferential oxidation of carbon monoxide (CO-PROX) to remove a small quantity of CO in an H2-rich stream (the new research direction in Viet Nam), fueling the proton exchange membrane fuel cell (PEMFC) energy system. The findings of the TPR-H2 experiment indicated that the catalyst produced through the first method exhibited an α reduction peak at 174 °C, which shows the effective dispersion of copper species. In combination with EPR results, the author anticipates a significant dispersion arising from isolated copper, which is recognized as a pivotal site in the CO-PROX reaction per numerous reputable studies. The catalyst synthesized by the second method did not provide a clear indication of the oxidation behavior of Cu-species. Therefore, it can be inferred that this catalyst is inappropriate for the low-temperature CO-PROX reaction.
{"title":"Initial Research on the 1%CuO – 6CeO2 – 4ZrO2 Catalysts by TPR-H2 for the Carbon Monoxide Preferential Oxidation (CO-PROX Reaction)","authors":"Ta Dinh Quang, Vuong Thanh Huyen, Le Minh Thang","doi":"10.51316/jst.172.etsd.2024.34.1.5","DOIUrl":"https://doi.org/10.51316/jst.172.etsd.2024.34.1.5","url":null,"abstract":"The 1wt%CuO – 6CeO2 – 4ZrO2 catalysts were synthesized by sol-gel method with two different procedures: (i) impregnating CuO on CeO2-ZrO2 support (CuO/CeO2-ZrO2), (ii) sol-gel of the Cu, Ce and Zr precursor together (CuO-CeO2-ZrO2). These catalysts were applied for the preferential oxidation of carbon monoxide (CO-PROX) to remove a small quantity of CO in an H2-rich stream (the new research direction in Viet Nam), fueling the proton exchange membrane fuel cell (PEMFC) energy system. The findings of the TPR-H2 experiment indicated that the catalyst produced through the first method exhibited an α reduction peak at 174 °C, which shows the effective dispersion of copper species. In combination with EPR results, the author anticipates a significant dispersion arising from isolated copper, which is recognized as a pivotal site in the CO-PROX reaction per numerous reputable studies. The catalyst synthesized by the second method did not provide a clear indication of the oxidation behavior of Cu-species. Therefore, it can be inferred that this catalyst is inappropriate for the low-temperature CO-PROX reaction.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":" 57","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140391954","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 : 2024-03-15DOI: 10.51316/jst.172.etsd.2024.34.1.8
Giang-Nam Le, Tra-Giang Nguyen
In contemporary mechatronic product development, embracing an interdisciplinary approach has become imperative to manage potential integration risks. This research paper introduces a viable solution that combines Automation Studio and the VDI 2206 methodology to design mechatronic systems. The study's findings highlight the efficacy of this interdisciplinary approach in effectively addressing early challenges associated with multi-domain integration. It enables simultaneous evaluation and resolution of limitations inherent in traditional design methods. Successfully applied to develop an automated garment folding machine with a PLC controller, the proposed process proves to be a valuable tool in optimizing mechatronic system development. The system, designed using this process, relies on a real-time computational model as its foundation, laying the groundwork for constructing a digital twin in the future. This ensures a comprehensive representation of the system, facilitating enhanced understanding and performance assessment during the development and operational phases. The adoption of such an approach signifies a significant step forward in advancing mechatronic engineering and ensuring the successful realization of complex and efficient systems.
在当代机电一体化产品开发中，采用跨学科方法管理潜在的集成风险已成为当务之急。本研究论文介绍了一种结合 Automation Studio 和 VDI 2206 方法来设计机电一体化系统的可行解决方案。研究结果凸显了这种跨学科方法在有效应对与多领域集成相关的早期挑战方面的功效。它能够同时评估和解决传统设计方法固有的局限性。在成功应用 PLC 控制器开发自动服装折叠机的过程中，所提出的流程被证明是优化机电一体化系统开发的宝贵工具。使用该流程设计的系统以实时计算模型为基础，为将来构建数字孪生系统奠定了基础。这确保了系统的全面呈现，有助于在开发和运行阶段加强理解和性能评估。采用这种方法标志着在推进机电一体化工程和确保成功实现复杂高效系统方面迈出了重要一步。
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