Chimica Techno Acta最新文献_第2页

Effect of carbon black from Ageratina adenophora and various other carbon anode plate additives on the performance of lead acid batteries Ageratina adenophora 炭黑和其他各种炭阳极板添加剂对铅酸电池性能的影响

Chimica Techno Acta Pub Date : 2024-04-08 DOI: 10.15826/chimtech.2024.11.2.03

Subban Ravi, Baskaran Vignesh, Nagarajan Meimoorthy, Bharathamani Dhanus Kumar, Lakshmanan Sathishkumar, Nagarajan Mohankumar, Nagarajan Kannapiran

{"title":"Effect of carbon black from Ageratina adenophora and various other carbon anode plate additives on the performance of lead acid batteries","authors":"Subban Ravi, Baskaran Vignesh, Nagarajan Meimoorthy, Bharathamani Dhanus Kumar, Lakshmanan Sathishkumar, Nagarajan Mohankumar, Nagarajan Kannapiran","doi":"10.15826/chimtech.2024.11.2.03","DOIUrl":"https://doi.org/10.15826/chimtech.2024.11.2.03","url":null,"abstract":"The incorporation of carbon materials in batteries serves to enhance its performance by improving conductivity, achieving uniform active material distribution, increasing capacity, mitigating sulfation, extending cycle life, and considering potential environmental benefits. Even though several possible mechanisms were reported, how exactly carbon works is not fully understood. In the present study a new form of carbon black was prepared from Ageratina adenophora (CBAa) and investigated for its impact on the electrical conductivity of the negative active material in 2 V lead acid cell. The performance was compared with other commercially available carbons like Graphite PG-10, Carbon N550, Carbon N330 and Carbon Vulcan. The carbon was characterised by XRD, SEM and grain size analysis. The initial capacity of the cell was consistently higher and remained stable at 4.6 W∙h; in the life cycle analysis, the cells showed 290 cycles. The post-life cycle test analysis showed that only a white layer on multiple plates indicating the onset of sulfation and there is no corrosion. The performance of the CBAa prepared in the present work was found to be better when compared with the commercially available carbons.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140729417","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

A review on agrowaste based activated carbons for pollutant removal in wastewater systems 基于农业废弃物的活性炭在废水系统中去除污染物的综述

Chimica Techno Acta Pub Date : 2024-04-04 DOI: 10.15826/chimtech.2024.11.2.02

K. Okiy, Joseph Nwabanne Tagbo, Walter Peter Echeng

{"title":"A review on agrowaste based activated carbons for pollutant removal in wastewater systems","authors":"K. Okiy, Joseph Nwabanne Tagbo, Walter Peter Echeng","doi":"10.15826/chimtech.2024.11.2.02","DOIUrl":"https://doi.org/10.15826/chimtech.2024.11.2.02","url":null,"abstract":"Environmental pollution from chemicals utilized in manufacturing, pharmaceuticals, and chemical process industries is of serious concern nowadays due to the contamination that ensues when these chemicals are discharged into water bodies. Activated carbon adsorption provides an efficient and economically viable means for mitigation of toxic chemicals (i.e., heavy metals, dyes, pharmaceutics, and antibiotics). However, the exorbitant cost of commercial activated carbons has resulted in the search for low-cost alternatives for the treatment of contaminated effluents. An exhaustive literature survey in this area is necessary to know the extent of work done in this area and seek out the gaps that future research will provide answers to. In this review, various works on activated carbon utilization, batch adsorption, fixed-bed adsorption (experimental and numerical studies) are summarized. This review elucidates the different kinetic and isotherm models of agrowastes-derived activated carbon materials in context with pollutants (dyes, heavy metals, pharmaceuticals, miscellaneous adsorbates) removal through batch and column methods. In addition, fixed-bed column adsorption/regeneration methods using various activated carbons derived from agrowastes are discussed. Among these methods, heavy metal adsorption from aqueous solutions by the activated carbons is the most efficient. The deployment of mathematical and machine learning approaches (ANN and novel GMDH algorithms) in optimization of batch and continuous adsorption processes are also highlighted. Numerical simulation of fixed-column adsorption systems for more improved industrial-scale column designs is described. Conclusions and future challenges of chemicals removal from polluted wastewater utilizing agrowaste-derived activated carbons are also presented.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":"6 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140743472","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

Effects of coagulant bath temperature toward separation performance and antifouling properties of PVDF/CA membranes for filtration of dyes 混凝剂浴温度对用于染料过滤的 PVDF/CA 膜的分离性能和防污性能的影响

Chimica Techno Acta Pub Date : 2024-04-01 DOI: 10.15826/chimtech.2024.11.2.01

Muhammad Reza, R. Rahmayani, C. Radiman

{"title":"Effects of coagulant bath temperature toward separation performance and antifouling properties of PVDF/CA membranes for filtration of dyes","authors":"Muhammad Reza, R. Rahmayani, C. Radiman","doi":"10.15826/chimtech.2024.11.2.01","DOIUrl":"https://doi.org/10.15826/chimtech.2024.11.2.01","url":null,"abstract":"Phase inversion is used to prepare poly(vinylidene fluoride) (PVDF) microfiltration membranes by combining it with the hydrophilic polymer additive cellulose acetate (CA). For the filtration of methylene blue (MB) and acid yellow 17 (AY17), the effects of coagulant bath temperature (CBT) on the separation performance and antifouling properties are thoroughly investigated. SEM analysis shows that the membrane at higher CBT has a larger pore diameter than at lower CBT, resulting in differences in membrane surface hydrophilicity. It is found that the increase in surface hydrophilicity causes the permeability of PVDF/CA membranes to be higher at higher CBT than at lower CBT. Rejection values above 90% indicate that the membranes are more effective for MB separation at both lower and higher CBT. Otherwise, lower CBT provides better AC rejection than higher CBT. The Flux Recovery Ratio, which is higher at higher CBT, remains in the 75–95% range at lower CBT. As a result, lower CBT is better for membrane fouling resistance than higher CBT. In addition, the fouling observed at lower CBT is similar to the fouling observed at higher CBT, but lower CBT has a higher percentage of reversible fouling than higher CBT. The membranes with more reversible fouling are therefore easier to clean using the backwashing process. As a result, PVDF/CA membranes manufactured at lower CBT have better separation performance and antifouling characteristics than those manufactured at higher CBT.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":"387 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140773191","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

Modern instrumentation and practical application of flame atomic emission spectrometry 火焰原子发射光谱法的现代仪器和实际应用

Chimica Techno Acta Pub Date : 2024-03-04 DOI: 10.15826/chimtech.2024.11.1.09

E. A. Zauer

{"title":"Modern instrumentation and practical application of flame atomic emission spectrometry","authors":"E. A. Zauer","doi":"10.15826/chimtech.2024.11.1.09","DOIUrl":"https://doi.org/10.15826/chimtech.2024.11.1.09","url":null,"abstract":"The modern instrumentation for flame atomic emission spectrometry (FAES) is overviewed: the main technical (composition of the fuel gas used, dispersing element, number of analytical channels, reference channel, detecting element, sampling method) and analytical (determined elements, range of determined concentrations, limits and the accuracy of their determination, the duration of a single measurement, the equired amount of the analyzed sample) characteristics of flame photometers for industrial and clinical use as well as spectrophotometers currently made by various manufacturers such as Sherwood Scientific Ltd., BWB Technologies UK Ltd., Labtron Equipment Ltd., Labnics Equipment Ltd. and JENWAY Ltd (UK); A.KRÜSS Optronic (Germany); Cole Parmer Instrument Company and Labfon Equipment Inc. (USA); Inesa Analytical Instrument Co., Ltd (China); OJSC Zagorsk Optical and Mechanical Plant, Unico-SIS LLC and VMK-Optoelectronics LLC (Russia); Manti Lab Solutions, Labtronics, Systonic, Globe Instruments, Electronics India, Lasany (India). The main areas of application of FAES are presented – bioenergy, agriculture (analysis of plants, soil extracts and fertilizers), mineral raw materials (geology), clinical medicine and pharmaceuticals, food industry, environmental control (analysis of drinking, technical and waste water), nuclear energy, metallurgy and chemical industry, as well as some features and problems associated with the preparation of samples for analysis by the FAES method. The review includes references to works on the practical application of FAES, published mainly from 1998 to 2023. ","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":"106 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140398241","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 graphite filler on the physiochemical properties of graphite reinforced thermoset rooflite – unsaturated polyester resin composites 石墨填料对石墨增强热固性屋顶石墨-不饱和聚酯树脂复合材料理化性能的影响

Chimica Techno Acta Pub Date : 2024-02-29 DOI: 10.15826/chimtech.2024.11.1.08

M. Karunakaran, Ravi Subban, A. Thangamani, C. Thangavel

{"title":"Effect of graphite filler on the physiochemical properties of graphite reinforced thermoset rooflite – unsaturated polyester resin composites","authors":"M. Karunakaran, Ravi Subban, A. Thangamani, C. Thangavel","doi":"10.15826/chimtech.2024.11.1.08","DOIUrl":"https://doi.org/10.15826/chimtech.2024.11.1.08","url":null,"abstract":"It is well known that many polymers are insulators with poor mechanical properties, which limit their use in fuel cell applications. Physicochemical properties of the polymers can be improved by adding conductive fillers. Carbon-based materials like graphite, which provides excellent mechanical strength and thermal conductivity to the polymer matrices, is of special interest because of its abundance, low cost and light weight when compared to other carbon allotropes. In the present work we describe the physicochemical properties of rooflite unsaturated polyester resin/graphite composites. Rooflite resin and three of its composites containing 1%, 3% and 5% of graphite by weight (C-2, C-3, and C-4, respectively) were synthesized and characterized by FTIR spectral data. XRD showed two peaks at 2q = 27.37°and 55.40° with d spacing value of 3.2559 nm and 1.6571 nm, respectively, indicating the change in degree of crystallinity of the composite. The calculated crystallinity for the resin is 7.3%, and for C-2, C-3 and C-4 its values are 12.1%, 14.3%, 17.1%, respectively, evidencing the interactions between the graphite and polymer matrix. The composites showed fractured surfaces and porous rough structure with randomly distributed vascularized cavities. Agglomeration occurs, when the concentration of graphite increases. The glass transition temperature for the pure resin is 65.9 °C and increases when the resin is filled with graphite. Thermogravimetric analysis (TGA) of the composites showed no marked difference between Tmax and Tfinal, and LOI values of C-3 and C-4 are above 21%, making them self-extinguishable materials that could be used for making bipolar plates. The chemical resistance investigation against water, NaCl, NaOH, acetic acid, and toluene showed more resistance to acid than alkali solutions. These rooflite resin/graphite composites could be further studied to explore the possibility of making bipolar plates, which are an essential component of fuel cells.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":"31 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140413176","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

Modification of bacterial cellulose using silk fibroin β-sheet crystals induced by ultrasonication 利用超声波诱导的丝纤维素β片晶对细菌纤维素进行改性

Chimica Techno Acta Pub Date : 2024-02-05 DOI: 10.15826/chimtech.2024.11.1.07

Mary Stephanie Carranza, Neil Andrew D. Bascos, Maria Carmen Tan, Francisco Franco Jr.

{"title":"Modification of bacterial cellulose using silk fibroin β-sheet crystals induced by ultrasonication","authors":"Mary Stephanie Carranza, Neil Andrew D. Bascos, Maria Carmen Tan, Francisco Franco Jr.","doi":"10.15826/chimtech.2024.11.1.07","DOIUrl":"https://doi.org/10.15826/chimtech.2024.11.1.07","url":null,"abstract":"Silk fibroin (SF) has been continuously explored as a biomaterial due to its biocompatibility, tunability, and self-healing properties. In this work, we present a novel approach to the modification of bacterial cellulose (BC) with SF β-sheet dominant structures induced via ultrasonication. Secondary structure analysis through infrared spectroscopy, thioflavin T assay, and circular dichroism spectropolarimetry revealed a conversion of silk I to silk II structures within the protein mixture. Cold field emission scanning electron microscope images revealed the tightly packed fibers coated with the protein. Thermogravimetric curves demonstrated higher resistance to temperature degradation supplemented by broader and flatter DSC curves attributed to the highly bonded and dense composite. Successful conversion of amide I to amide II and amide III allowed for the more stable β-crystals to contribute to a more thermodynamically stable double-network hydrogel. The conversion of silk I to silk II structures offers a viable and highly biocompatible material that is both thermodynamically and biochemically stable for various potential biomedical applications.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":"201 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139862430","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

Modification of bacterial cellulose using silk fibroin β-sheet crystals induced by ultrasonication 利用超声波诱导的丝纤维素β片晶对细菌纤维素进行改性

Chimica Techno Acta Pub Date : 2024-02-05 DOI: 10.15826/chimtech.2024.11.1.07

Mary Stephanie Carranza, Neil Andrew D. Bascos, Maria Carmen Tan, Francisco Franco Jr.

{"title":"Modification of bacterial cellulose using silk fibroin β-sheet crystals induced by ultrasonication","authors":"Mary Stephanie Carranza, Neil Andrew D. Bascos, Maria Carmen Tan, Francisco Franco Jr.","doi":"10.15826/chimtech.2024.11.1.07","DOIUrl":"https://doi.org/10.15826/chimtech.2024.11.1.07","url":null,"abstract":"Silk fibroin (SF) has been continuously explored as a biomaterial due to its biocompatibility, tunability, and self-healing properties. In this work, we present a novel approach to the modification of bacterial cellulose (BC) with SF β-sheet dominant structures induced via ultrasonication. Secondary structure analysis through infrared spectroscopy, thioflavin T assay, and circular dichroism spectropolarimetry revealed a conversion of silk I to silk II structures within the protein mixture. Cold field emission scanning electron microscope images revealed the tightly packed fibers coated with the protein. Thermogravimetric curves demonstrated higher resistance to temperature degradation supplemented by broader and flatter DSC curves attributed to the highly bonded and dense composite. Successful conversion of amide I to amide II and amide III allowed for the more stable β-crystals to contribute to a more thermodynamically stable double-network hydrogel. The conversion of silk I to silk II structures offers a viable and highly biocompatible material that is both thermodynamically and biochemically stable for various potential biomedical applications.","PeriodicalId":9964,"journal":{"name":"Chimica Techno Acta","volume":"19 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139802786","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

Synthesis and electrical properties of doped layered perovskites based on BaMInO4 (M = Y, Gd) 基于 BaMInO4（M = Y、Gd）的掺杂层状过氧化物的合成和电学特性

Chimica Techno Acta Pub Date : 2024-02-02 DOI: 10.15826/chimtech.2024.11.1.06

Nataliia Tarasova, Maxim Mashkovtsev, Maxim Domashenkov, Denis Khionin, Roman Bastrikov, A. Bedarkova

引用次数: 0

Synthesis and electrical properties of doped layered perovskites based on BaMInO4 (M = Y, Gd) 基于 BaMInO4（M = Y、Gd）的掺杂层状过氧化物的合成和电学特性

Chimica Techno Acta Pub Date : 2024-02-02 DOI: 10.15826/chimtech.2024.11.1.06

Nataliia Tarasova, Maxim Mashkovtsev, Maxim Domashenkov, Denis Khionin, Roman Bastrikov, A. Bedarkova

引用次数: 0

Interaction of silica with polystyrene: mechanical properties, polymer/filler adhesion and failure behavior 二氧化硅与聚苯乙烯的相互作用：机械特性、聚合物/填料粘附性和失效行为

Chimica Techno Acta Pub Date : 2024-02-01 DOI: 10.15826/chimtech.2024.11.1.05

Selvin P. Thomas

引用次数: 0