Key Engineering Materials最新文献

Extraction of Chitosan Derived from Mushroom by Deacetylation for Wastewater Treatment 通过脱乙酰化提取从蘑菇中提取的壳聚糖用于废水处理

Key Engineering Materials Pub Date : 2024-07-10 DOI: 10.4028/p-ozx2m4

Tatchapol Nanmong, D. Tanangteerapong

{"title":"Extraction of Chitosan Derived from Mushroom by Deacetylation for Wastewater Treatment","authors":"Tatchapol Nanmong, D. Tanangteerapong","doi":"10.4028/p-ozx2m4","DOIUrl":"https://doi.org/10.4028/p-ozx2m4","url":null,"abstract":"In this study, Volvariella vovacea (straw mushroom, SM) and Flammulina velutipes (Golden mushroom, GM) were used as a natural source of chitin. The aim of this research is to extract chitin and thus, converted into chitosan via acetylation process. The obtained chitosan was applied in the wastewater treatment process as the coagulant to improve the quality of wastewater. As these two types of mushrooms are readily available in the local area in Northeastern Thailand and relatively cheap. The chitin extraction process was obtained by firstly removing fat, minerals, protein and pigment of SM and GM using petroleum ether, HCl, NaOH and acetone respectively. Extracted chitin was deacetylated by using 50% (v/v) NaOH at 140 oC for 2 hours to convert into chitosan. The properties of extracted chitosan was examined by FT-IR and TGA. FTIR spectrum showed the peaks of C-H stretching at 2870 cm-1 , N-H2 bending at 1586 cm-1, N-H stretching at 1026 cm-1, etc. which corresponded to the standard chitosan. TGA showed the thermal decomposition which is divided into three phases. First stage of weight loss is between 50-115 °C caused by water evaporation. There was no changes of weight during a temperature of 115-268 °C. The second phase during 268-330 °C indicates a significant weight loss which is due tot he saccharide degradation of chitosan and at a temperature more than 330°C refers to the volatile organic material. As a result of TGA, it can be confirmed that the extracted chitosan from SM and GM is very similar to the standard commercial chitosan. After that, 3 g of extracted chitosan was mixed with 300 mL of deionized water and 6 mL of acetic acid was added for 24 hours to prepare the chitosan coagulant. Then, it was dropped in the separate jar which contained high TSS, COD and BOD wastewater. The results showed that chitosan biocoagulant could reduce TSS, COD and BOD by 62, 62 and 88% respectively which proved to be efficient in the use of wastewater treatment.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":"38 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141662103","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}

引用次数: 0

Functional Materials in Advanced and Building Engineering and Wastewater Treatment 先进建筑工程和废水处理中的功能材料

Key Engineering Materials Pub Date : 2024-07-10 DOI: 10.4028/b-6szkns

X. Zhu, Kiang Hwee Tan, Hamada Shoukry

引用次数: 0

Development of Hygrothermal Reference Year for Hygrothermal Simulation of Hygroscopic Building Construction for Guangzhou 为广州吸湿性建筑的吸湿热模拟制定吸湿热参考年

Key Engineering Materials Pub Date : 2024-07-10 DOI: 10.4028/p-yqe2zj

Zu Jian Huang, Yang Zhao

{"title":"Development of Hygrothermal Reference Year for Hygrothermal Simulation of Hygroscopic Building Construction for Guangzhou","authors":"Zu Jian Huang, Yang Zhao","doi":"10.4028/p-yqe2zj","DOIUrl":"https://doi.org/10.4028/p-yqe2zj","url":null,"abstract":"For developing a hygrothermal reference year (HRY) to support the hygrothermal simulation of hygroscopic building construction in Guangzhou, a typical hot-humid city located in south China, the study first clarifies the correlation between the hygrothermal simulation results and the meteorological elements based on a 10-year baseline simulation with the hourly meteorological source data series obtained from the city weather station (CWS, from 2010 to 2019), then develops the HRY with consideration to typical construction conditions, and finally evaluates the representativeness of HRY. It shows that the simulation results of HVAC demand, indoor hygrothermal environment and exterior walls moisture content are significantly correlated with the air temperature Te, relative humidity RHe, and the normal rain RN. Based on this correlation, Te.mean, RHe.mean and RNsum are used as the indexes for selecting typical months from the source data series, which are then spliced to generate the HRY. A parallel simulation comparison among four model groups accordingly with HRY, CWS as well as two commonly used meteorological data, Meteo and epw, as outdoor climate conditions, shows that the curve similarity of monthly simulation results between the HRY model group and the CWS group has been significantly improved, and the annual simulation results of the HRY group are also in good agreement with the CWS group.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":"15 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141661278","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}

引用次数: 0

An Experimental Study on Electromagnetic Shielding Effectiveness and Impact Resistance of UHPC for Protective Facilities 防护设施用超高强度混凝土的电磁屏蔽效果和抗冲击性实验研究

Key Engineering Materials Pub Date : 2024-07-10 DOI: 10.4028/p-ola9so

Chang Yu Kuo, Ying Kuan Tsai, Jo Yen Nieh, Yi Shiuan Tian

引用次数: 0

Experimental Study on Fracture Properties of Self-Compacting Concrete Containing Red Mud Waste and Different Steel Fiber Types 含赤泥废料和不同钢纤维的自密实混凝土断裂性能实验研究

Key Engineering Materials Pub Date : 2024-07-10 DOI: 10.4028/p-iwujy3

Hassan M. Magbool

{"title":"Experimental Study on Fracture Properties of Self-Compacting Concrete Containing Red Mud Waste and Different Steel Fiber Types","authors":"Hassan M. Magbool","doi":"10.4028/p-iwujy3","DOIUrl":"https://doi.org/10.4028/p-iwujy3","url":null,"abstract":"This study aims to investigate the effect of integrating red mud (RM) waste and different types of steel fibers on the fracture toughness characteristics of self-compacting concrete (SCC). A total of 24 specimens consisting of notched SCC beams with various steel fibers (measuring 100 × 100 × 500 mm) are subjected to a three-point bending test. This study examines five various fiber types characterized by varying shapes and aspect ratios. These fiber types include the hook-end fiber with lengths of 60 and 30 mm, the long straight fiber with lengths of 21 and 13 mm, and the flat-end fiber. Six concrete mixtures, each incorporating fibers with 1% of the volume percentage, are examined. RM is used at a replacement rate of 20% of the mass of cement. Another objective of the study is to analyze the mechanical and fresh characteristics of concrete. The findings indicate that the incorporation of steel fiber has an adverse effect on the fresh concrete characteristics of SCC. The presence of steel fiber results in enhanced mechanical properties, peak loads, and deflection at the point of failure, in addition to an increase in the crack mouth opening displacement. The fracture toughness of SCC mixtures is also influenced by the presence of steel fiber.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":"20 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141661382","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}

引用次数: 0

Effect of Copper Chloride on Phase Structure and Properties of Synthesized Materials from Flue Gas Desulfurization Gypsum 氯化铜对烟气脱硫石膏合成材料相结构和性能的影响

Key Engineering Materials Pub Date : 2024-07-10 DOI: 10.4028/p-l9cqrk

Teeratada Yanwattana, N. Soykeabkaew, S. Duangphet, S. Chumphongphan, U. Intatha, N. Tawichai

{"title":"Effect of Copper Chloride on Phase Structure and Properties of Synthesized Materials from Flue Gas Desulfurization Gypsum","authors":"Teeratada Yanwattana, N. Soykeabkaew, S. Duangphet, S. Chumphongphan, U. Intatha, N. Tawichai","doi":"10.4028/p-l9cqrk","DOIUrl":"https://doi.org/10.4028/p-l9cqrk","url":null,"abstract":"This research investigates the influence of crystal modifying agent, copper chloride (CuCl2) (0.3, 0.45, and 0.6 g), on the phase structure and characteristics of materials derived from flue gas desulfurization (FGD) gypsum. The raw material underwent hydrothermal transformation with 0.01 M H2SO4 at 90°C for 1 hour. XRD analysis revealed a notable shift in phase structure from hexagonal calcium sulfate dihydrate (DH) in FGD gypsum to monoclinic calcium sulfate hemihydrate (alpha-HH) up to 91%in the synthesized products, with an increasing CuCl2 content. SEM analysis revealed the elongated whisker-shaped particles (110.70 µm to 207.90 µm) of alpha-HH with higher CuCl2 concentrations. Specifically, when incorporating 0.6 g of CuCl2 in 0.01 M H2SO4 at 90°C, the longest alpha-HH crystals resulted in the cast plaster with the highest flexural strength of approximately 4.92 MPa, demonstrating suitability for applications requiring sufficient mechanical strength. Thermal analysis confirmed the complete conversion of the solid phase to alpha-HH at 1200°C. Additionally, the study revealed that higher CuCl2 content led to shorter setting time. These results suggest potential applications of the present synthesized materials from FGD gypsum in industries such as ceramics casting and dental materials, where precise control over material properties is critical.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":"23 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141662184","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}

引用次数: 0

Evaluating the Deicing Performance of Copper Sulfide Nanoparticle-Infused Transparent Photothermal Coatings on Glazing: An Integrative Experimental and Simulation Study 评估注入硫化铜纳米粒子的透明光热涂层在玻璃上的除冰性能：实验与模拟综合研究

Key Engineering Materials Pub Date : 2024-07-10 DOI: 10.4028/p-ame4ns

Rui Tang, Wei Jian, Denvid Lau

引用次数: 0

Conductive Inks with Chemically Sintered Silver Nanoparticles at Room Temperature for Printable, Flexible Electronic Applications 在室温下使用化学烧结银纳米颗粒的导电油墨，用于可印刷的柔性电子应用

Key Engineering Materials Pub Date : 2024-07-10 DOI: 10.4028/p-daaz5z

Bethel Faith Y. Rezaga, M. D. Balela

引用次数: 0

Study of Two Synthesized Methods of Gold Nanoparticles Synthesis Using Fresh Flowers Extracts of Clitoria ternatea 利用新鲜燕麦花提取物合成金纳米粒子的两种合成方法研究

Key Engineering Materials Pub Date : 2024-07-10 DOI: 10.4028/p-fcqy8x

T. Chimsook

引用次数: 0

Nanomaterials as Next-Gen Corrosion Inhibitors: A Comprehensive Review for Ceramic Wastewater Treatment 纳米材料作为新一代缓蚀剂：陶瓷废水处理综述

Key Engineering Materials Pub Date : 2024-07-10 DOI: 10.4028/p-gonm0k

Rabab El-Sherif, A. Mahmoud, D. E. Abd‐El‐Khalek, E. Khamis

{"title":"Nanomaterials as Next-Gen Corrosion Inhibitors: A Comprehensive Review for Ceramic Wastewater Treatment","authors":"Rabab El-Sherif, A. Mahmoud, D. E. Abd‐El‐Khalek, E. Khamis","doi":"10.4028/p-gonm0k","DOIUrl":"https://doi.org/10.4028/p-gonm0k","url":null,"abstract":"This study reviews the use of corrosion inhibitors in industrial wastewater treatment, specifically in ceramic wastewater. It discusses the main problem limits the use of treated wastewater, which is corrosion behavior. To reduce this behavior and enable safe reuse of industrial wastewater, corrosion inhibitors are used. The study aims to provide insights into the selection, use, and effectiveness of corrosion inhibitor types in the media under study. The results can help engineers, researchers, and wastewater treatment professionals to find the best corrosion inhibitors for various municipal wastewater applications, increasing the sustainability and efficiency of wastewater treatment processes. The ceramic industry faces challenges in managing complex aqueous effluents generated from mining, shaping, glazing, and manufacturing processes. Nanomaterial-based alternatives, such as titanium nanotubes, zinc oxide nanoparticles, nanoenhanced filters, and stimuli responsive polymer and silica coatings, have emerged as promising next-generation corrosion inhibitors due to their multilayer passivation and high specific surface area. The analysis focuses on the feasibility of these materials' mechanisms, such as crystal deformation, nucleation hindrance, coating barriers, and passivation improvement, in industrial settings. In conclusion, the use of corrosion inhibitors in industrial wastewater treatment can significantly improve the sustainability and efficiency of wastewater treatment processes. Understanding the mechanisms by which these nanomaterials influence crystal growth modification, deposition kinetics, and passivation performance could lead to more effective and sustainable solutions for industrial wastewater treatment.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":"11 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141659306","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}

引用次数: 0