Kemija u Industriji-Journal of Chemists and Chemical Engineers最新文献_第8页

Adsorption of Rhodamine 6G Dye onto Al-MCM-41 and MCM-41 Mesoporous Materials 罗丹明6G染料在Al-MCM-41和MCM-41介孔材料上的吸附

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Kemija u Industriji-Journal of Chemists and Chemical Engineers Pub Date : 2022-09-20 DOI: 10.15255/kui.2022.001

Houda Douba, O. Mohammedi, B. Cheknane

引用次数: 1

Low-cost Packing Materials in an Aerated Biofilter for Lagoon Effluent Treatment 曝气生物滤池处理泻湖污水的低成本填料

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Kemija u Industriji-Journal of Chemists and Chemical Engineers Pub Date : 2022-09-20 DOI: 10.15255/kui.2022.017

Malika Khelladi, Meriem Abaidia, Senouci Boulerial, K. Bekrentchir, A. Benhamou, A. Debab

{"title":"Low-cost Packing Materials in an Aerated Biofilter for Lagoon Effluent Treatment","authors":"Malika Khelladi, Meriem Abaidia, Senouci Boulerial, K. Bekrentchir, A. Benhamou, A. Debab","doi":"10.15255/kui.2022.017","DOIUrl":"https://doi.org/10.15255/kui.2022.017","url":null,"abstract":"As part of a comprehensive evaluation of post-treatment techniques for the removal of chemical and microbiological pollutants from lagoon effluents, an aerated biofilter was designed. The main objective of this study was to evaluate the performance of pozzolan and Luffa cylindrica as low-cost packing materials for the advanced treatment of Stidia natural lagoon effluent. The aerated biofilter operates in down-flow with HLR s of 11.37 to 28.43 m 3 m −2 d −1 and an air/liquid flow ratio of 3 : 1. The differ ent experiments performed on the pilot showed that the percentages of sCOD removal vary with the HLR s and the wastewater concentration at the biofilter inlet. In this study, sCOD removal efficiencies above 78.9 % were achieved depending on HLR , and a maximum removal efficiency of TSS of 71.5 % was obtained for 28.43 m 3 m −2 d −1 . At low HLR (11.37 m 3 m −2 d −1 ), the treated effluent had the following average concentrations: sCOD of 29.5 mg l −1 , BOD 5 of 21.7 mg l −1 and TSS of 26.4 mg l −1 . These experimental results were used with an empirical model to determine the media constant n and treatability factor K . The faecal coliforms and Escherichia coli detected in the treated effluent were less than 10 5 CFU/100 ml, which meet the national guidelines for wastewater reuse in irrigation.","PeriodicalId":43849,"journal":{"name":"Kemija u Industriji-Journal of Chemists and Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46136031","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

Gas Holdup in Turbulent Bed Contactor: Experiments and Prediction Model 湍流床接触器中气体滞留量的实验与预测模型

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Kemija u Industriji-Journal of Chemists and Chemical Engineers Pub Date : 2022-09-20 DOI: 10.15255/kui.2021.094

B. Bensebia, F. Chaouche, S. Moustefaï

引用次数: 0

Impact of Mo and W on CrXO3 (X = Cr, Mo, W) Catalytic Performance in a Propane Non-oxidative Dehydrogenation Process Mo和W对丙烷非氧化脱氢过程中CrXO3（X=Cr，Mo，W）催化性能的影响

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Kemija u Industriji-Journal of Chemists and Chemical Engineers Pub Date : 2022-09-20 DOI: 10.15255/kui.2022.006

Toyese OYEGOKE, F. Dabai, Saidu M. Waziri, A. Uzairu, B. Y. Jibril

{"title":"Impact of Mo and W on CrXO3 (X = Cr, Mo, W) Catalytic Performance in a Propane Non-oxidative Dehydrogenation Process","authors":"Toyese OYEGOKE, F. Dabai, Saidu M. Waziri, A. Uzairu, B. Y. Jibril","doi":"10.15255/kui.2022.006","DOIUrl":"https://doi.org/10.15255/kui.2022.006","url":null,"abstract":"The impact of molybdenum (Mo) and tungsten (W) on improving the catalytic characteristics of the chromium-based cata- lyst, Cr 2 O 3 , was explored in this study. The use of semi-empirical and density functional theory computational methods was deployed to understand the impact of the substitution of the chromium (Cr) with Mo and W on the catalyst, CrXO 3 (where X = Cr, Mo, W) in the production of propylene from propane. Findings from the investigation confirmed that the surface mod - ified with Mo showed better potential for improving the catalyst selectivity, retarding propylene dehydrogenation, cracking, and coking path than W, which offered a lower selectivity. The use of Mo was found to have better facilitated the propylene production due to its lower affinity for coke and cracking promoting adsorbates accounted for its sites, including easier deso rption of propylene and higher barrier of deep dehydrogenation for preventing the production of undesired products, unlike the use of W. This study, therefore, recommends the use of Mo for the improvement of the catalyst that could result in better propylene yield, which could aid in meeting its rising market demand.","PeriodicalId":43849,"journal":{"name":"Kemija u Industriji-Journal of Chemists and Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47756166","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: 1

Functional Properties and Physicochemical Characterization of Mucilage Extracted from Punica granatum L. Peels and Their Application in Pharmaceutical Suspension Preparation 石榴皮黏液的功能特性、理化性质及其在悬浮液中的应用

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Kemija u Industriji-Journal of Chemists and Chemical Engineers Pub Date : 2022-07-20 DOI: 10.15255/kui.2021.076

K. Boutemak, Ahlam Amrane, N. Taoualit, Nabila Bensacia, Meriem Arkam

引用次数: 0

Comparative Radiation Dose Study of a Hypothetical Accident in a Research Reactor 研究堆假想事故的比较辐射剂量研究

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Kemija u Industriji-Journal of Chemists and Chemical Engineers Pub Date : 2022-07-20 DOI: 10.15255/kui.2021.077

A. Dahia, Djemai Merrcoche, A. Dadda, Amina Lyria Deghal Cheridi

引用次数: 2

Svjetska proizvodnja čelika u razdoblju od 2000. do 2020. godine

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Kemija u Industriji-Journal of Chemists and Chemical Engineers Pub Date : 2022-07-20 DOI: 10.15255/kui.2022.009

M. Gojić, Ivana Ivanić, Dijana Knežević

{"title":"Svjetska proizvodnja čelika u razdoblju od 2000. do 2020. godine","authors":"M. Gojić, Ivana Ivanić, Dijana Knežević","doi":"10.15255/kui.2022.009","DOIUrl":"https://doi.org/10.15255/kui.2022.009","url":null,"abstract":"This paper shows the trend of the world crude steel production in the first two decades of the 21 st century. From 2000 to 2020, the world steelmaking continuously increased (total production of 28.5 billion t steel), but decreased in 2008 (1,6 %) and 2009 (7,7 %) because of the global finan cial and economic crises. For more than fifty years, the primary steelmaking processes are those by means of two technologies: oxidation of pig iron (product from blast furnace) in basic oxygen converters by means of technical oxygen, and smelting of old ferrous (steel scrap) in the electro arc furnaces. For the production of quality steel, the secondary metallurgy procedures (treatment of steel in ladle) play a greater role. In 2000, global steel production was 847.2 million t (basic ox - ygen converters share was 58.2 % and the electro arc furnaces 33.8 %), while in 2020, production reached 1.8775 billion t steel, which is an increase of 2.2 times. By 2020, the production of steel by steelmaking processes was 73.2 % by basic oxygen converters, 26.3 % by electro arc furnaces, 0.3 % by Siemens-Martin furnaces, and 0.2 % by other procedures of steel production. Primacy in steelmaking is in countries and companies from Asia (73.9 % of the world’s output). The recycling degree of steel in the period from 2011 to 2019 was 34–37 %. China is the largest world steel- making country (since 1996). China had an increase in steelmaking of 8.3 times in the period from 2000 to 2020 (from 127.2 Mt up to 1.064 Gt). China produced 56.6 % of the world’s steel. From 2000 to 2020, a share of continuous casting was increased by about 10 % (from 87 to 96.6 %).","PeriodicalId":43849,"journal":{"name":"Kemija u Industriji-Journal of Chemists and Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42100205","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 Structural Changes in Bile Salt Hydrolase Enzyme on Biocatalytic Efficiency and Activation Energy at Working pH and Temperature Conditions pH和温度条件下胆汁盐水解酶结构变化对生物催化效率和活化能的影响

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Kemija u Industriji-Journal of Chemists and Chemical Engineers Pub Date : 2022-07-20 DOI: 10.15255/kui.2021.075

Y. Ermurat, M. Öztürk, Cansu Önal, Zekiye Kılıçsaymaz

{"title":"Effects of Structural Changes in Bile Salt Hydrolase Enzyme on Biocatalytic Efficiency and Activation Energy at Working pH and Temperature Conditions","authors":"Y. Ermurat, M. Öztürk, Cansu Önal, Zekiye Kılıçsaymaz","doi":"10.15255/kui.2021.075","DOIUrl":"https://doi.org/10.15255/kui.2021.075","url":null,"abstract":"Microbial bile salt hydrolases (BSHs) catalyse the hydrolysis of glycine and taurine-linked bile salts in the small intestine of humans. Achieving the effects of structural changes in BSH molecules on biocatalytic efficiency ( k cat / K m ) and activation energy ( E a ) is necessary to determine biocatalytic performances of the enzymes. Amino acids responsible for biocatalytic activity or substrate specificity in BSH molecules were modified to determine the effects of structural changes on k cat / K m values and E a values of the bioconversion reactions. Purified wild type positive control enzyme (pCON2) and mutant recombinant target enzymes (F18L and Y24L) reacted with six conjugated pure bile salt substrates at working temperature and pH conditions. The results of the hydrolysis conversion analysis conducted at various pH conditions were used to estimate k cat / K m , and the assays conducted at various temperature conditions were used to approximate E a of the biocatalytic reactions. The quantified k cat / K m value was found remarkably highest with mutant recombinant enzymes (Y24L), while the efficiency value with wild type (pCON2) was determined as lowest, indicating that the structural modifications in BSH molecules showed higher values. The alterations with the mutant-type enzymes F18L and Y24L resulted in decreasing k cat / K m and increasing E a estimations of the hydrolysis conversion reactions.","PeriodicalId":43849,"journal":{"name":"Kemija u Industriji-Journal of Chemists and Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47750000","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

The Chloroquine Story in the First Year of the COVID-19 Pandemic 新冠肺炎大流行第一年的氯喹故事

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Kemija u Industriji-Journal of Chemists and Chemical Engineers Pub Date : 2022-07-20 DOI: 10.15255/kui.2021.072

Matea Hunić, R. Teparić, Monika Kovačević, Lidija Barišić

{"title":"The Chloroquine Story in the First Year of the COVID-19 Pandemic","authors":"Matea Hunić, R. Teparić, Monika Kovačević, Lidija Barišić","doi":"10.15255/kui.2021.072","DOIUrl":"https://doi.org/10.15255/kui.2021.072","url":null,"abstract":"The emergence of COVID-19 has caused worldwide concern due to its high infectivity and mortality. Research groups around the world have prioritised drug development against COVID-19. Repurposing of already approved drugs, including the antimalarial drug chloroquine, has attracted considerable attention. The aim of this article is to (i) provide an overview of the recent chemical methods used to synthesise chloroquine and hydroxychloroquine, and (ii) provide insight into the data collected in 2020 on their efficacy against COVID-19. Unfortunately, the promising early results have not been confirmed and a clear and unambiguous conclusion on their clinical efficacy has not yet been drawn. (English) [ FROM AUTHOR] Pojava COVIDA-19 uzrokovala je globalnu zabrinutost zbog visoke zaraznosti i mortaliteta. Stoga je razvoj lijekova protiv COVIDA-19 postao prioritet istraživačkim skupinama diljem svijeta. Pri tom je posebnu pozornost privukla moguća prenamjena prethodno odobrenih lijekova, uključujući i antimalarijski lijek klorokin. Cilj ovog rada je (i) prikazati pregled recentnih kemijskih metoda primijenjenih za sintezu klorokina i hidroksiklorokina te (ii) dati uvid u podatke o njihovoj učinkovitosti protiv COVIDA-19 prikupljene tijekom 2020. Nažalost, početni obećavajući rezultati nisu potvrđeni, a jasni i nedvosmisleni zaključci o kliničkoj učinkovitosti klorokina i hidroksiklorokina još nisu postignuti. (Croatian) [ FROM AUTHOR] Copyright of Kemija u Industriji is the property of Croatian Society of Chemical Engineers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full . (Copyright applies to all s.)","PeriodicalId":43849,"journal":{"name":"Kemija u Industriji-Journal of Chemists and Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45485139","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

Study of n-Butane Isomerization on Acid Catalysts Niobium and Lanthanum Promoted Tungstated Zirconia: n-Butane Isomerization Activity 铌镧促进钨氧化锆酸性催化剂上正丁烷异构化的研究:正丁烷异构化活性

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Kemija u Industriji-Journal of Chemists and Chemical Engineers Pub Date : 2022-07-20 DOI: 10.15255/kui.2021.078

Zahira Mohamed Seghir, M. Djennad, R. Schomäcker, M. R. Ghezzar

{"title":"Study of n-Butane Isomerization on Acid Catalysts Niobium and Lanthanum Promoted Tungstated Zirconia: n-Butane Isomerization Activity","authors":"Zahira Mohamed Seghir, M. Djennad, R. Schomäcker, M. R. Ghezzar","doi":"10.15255/kui.2021.078","DOIUrl":"https://doi.org/10.15255/kui.2021.078","url":null,"abstract":"The requirement for environmentally friendly catalysts for the isomerization of alkanes has prompted research on the tung - state-zirconia (WZ) system. The present work examines the activity and selectivity of lanthanum (La) promoted tungstate-zir conia (LWZ) and niobium (Nb) promoted tungstate-zirconia (NWZ) catalysts. In this study, 1 % La promoted WZ (1 % LWZ) and 1 % Nb promoted WZ (1 % NWZ) catalysts were investigated in isomerization of n -butane in the presence of hydrogen. The studied catalysts were characterized by different methods: nitrogen physisorption, temperature programmed desorption of NH 3 , thermogravimetric analysis, and X-ray diffraction. The catalytic activity and selectivity were significantly improved by the addition of 1 % Nb. The redox process in the Nb-containing catalyst (1 % NWZ) played a central role by providing the highest acidic sites (283.53 µmol g −1 ) with appropriate activation energies for the skeletal rearrangement of the reactant ( n -butane). Furthermore, this study highlights the determining role of the transfer process of adsorbed species from ZrO 2 to W as well as to the Nb environment. The conversion of n -butane (27.34 %) and the selectivity to i -butane (92.34 %) for NWZ were signif icantly higher than WZ and LWZ catalysts. The experimental results revealed that Nb was a more effective promoter than La.","PeriodicalId":43849,"journal":{"name":"Kemija u Industriji-Journal of Chemists and Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43583274","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