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Impact Assessment of 2020 COVID-19 Lockdown on Landfill Leachate Treatment in Rio de Janeiro 2020年COVID-19封锁对里约热内卢垃圾填埋场渗滤液处理的影响评估
Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220066
R. Soares, Beatriz César Maestá, Felipe Debize da Motta, R. Naegele, Carlos Eduardo Soares Canejo Pinheiro da Cunha
In Brazil adopted different Non-Pharmacological Intervention measures (NPIs) to reduce the levels of transmission and contagion of the novel Coronavirus SARS-CoV-2, the pathogen causing the COVID-19 pandemic. The objective of this work was to evaluate the impact of Non-Pharmacological Intervention measures on the composition and treatment efficacy of Landfill Leachate treated by Reverse Osmosis in the city of Campos dos Goytacazes, Rio de Janeiro. It was observed that the Lockdown and the massive use of personal hygiene/cleaning materials, as well as the increase in food consumption, provided an unprecedented 140% overload in the daily generation of Municipal Solid Waste (MSW) in the Campos dos Goytacazes Landfill. The Leachate from this Landfill presented a slightly alkaline pH (pH ≈ 8.0), high concentrations of dissolved organic matter (BOD 5 and COD), and ammoniacal nitrogen. In addition, it was observed that 23% of the parameters in the raw leachate exceeded the respective maximum allowable values recommended by the federal legislation. However, in the period evaluated by this study, the Reverse Osmosis was technically and environmentally effective in treating the raw leachate, not being observed any result in the treated leachate that exceeded the Resolution CONAMA 430/2011.
巴西采取了不同的非药物干预措施(npi),以降低新型冠状病毒SARS-CoV-2(引起COVID-19大流行的病原体)的传播和传染水平。这项工作的目的是评估非药物干预措施对里约热内卢坎波斯多斯戈伊塔卡泽斯市反渗透处理垃圾渗滤液的组成和处理效果的影响。据观察,封锁和个人卫生/清洁材料的大量使用,以及食品消费的增加,使坎波斯多斯戈伊塔卡兹垃圾填埋场每天产生的城市固体废物(MSW)达到了前所未有的140%超载。该填埋场渗滤液pH值为微碱性(pH≈8.0),溶出有机物(BOD 5和COD)和氨态氮含量较高。此外,观察到原渗滤液中有23%的参数超过了联邦立法建议的最大允许值。然而,在本研究评估期间,反渗透在处理原渗滤液方面在技术上和环境上都是有效的,未观察到处理后的渗滤液的任何结果超过CONAMA 430/2011号决议。
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引用次数: 0
Phytochemical Characterization and Chemical Stability of Green Tea Extract 绿茶提取物的植物化学性质及化学稳定性
Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220069
Ana Paula Azevêdo Macêdo, Mariane dos Santos Gonçalves, Oscar Caetano da Silva Neto, Ricardo David Couto, Jorge Mauricio David
tea From a of view, phytochemical analyzes is essential to know the composition and concentration of compounds in green tea, as well as the stability of these components. In this study the phytochemical properties and chemical stability of green tea were evaluated. A sample, widely sold in was submitted to following of analyzes for detection of the main compounds and evaluation of the stability of green tea extract preparations by HPLC. As result, the green tea extract presented caffeine (34.4%), epi catechin gallate (11.9%), and epi gallocatechin (5.8%) as main identified compounds in its composition. During the four weeks of evaluation, the main metabolites presented small decomposition rate (2.4 to 2.9%). In addition, the phytochemical analysis revealed the presence of several secondary metabolites in their composition (alkaloids, glycosides, saponins, tannins, terpenoids, caffeine and flavonoids). This demonstrates that green tea extract has compounds with properties that bring health benefits but also as it contains other secondary metabolites, and its therapeutic use should be carefully evaluated.
从一个角度来看,植物化学分析对于了解绿茶中化合物的组成和浓度以及这些成分的稳定性至关重要。本研究对绿茶的植物化学性质和化学稳定性进行了评价。采用HPLC法对一种销售广泛的样品进行了主要成分的检测和绿茶提取物制剂的稳定性评价。结果表明,绿茶提取物的主要鉴定成分为咖啡因(34.4%)、儿茶素没食子酸酯(11.9%)和儿茶素(5.8%)。在4周的评估中,主要代谢物的分解率较小(2.4 ~ 2.9%)。此外,植物化学分析显示其成分中存在几种次生代谢物(生物碱、苷类、皂苷、单宁、萜类、咖啡因和黄酮类)。这表明绿茶提取物具有对健康有益的化合物,但也含有其他次级代谢物,其治疗用途应仔细评估。
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引用次数: 0
Acid Leaching of Rare Earth Elements Present in Waste Electrical and Electronic Equipment: A Brief Review 废电器电子设备中稀土元素的酸浸研究综述
Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220078
Rodrigo F. Gomes, Matheus M. Pereira, Versiane A. Leão
This is an open-access article distributed under the terms of the Creative Commons Attribution License. Rev. Virtual Quim., 2022, no prelo, 1-10 ©2021 Sociedade Brasileira de Química 1 aUniversidade Federal de Ouro Preto, Pós -Graduação em Engenharia de Materiais, CEP 35400-000, Ouro Preto-MG, Brasil. bUniversidade Federal de Ouro Preto, Departamento de Engenharia Metalúrgica e de Materiais, Laboratório de Bio&Hidrometalurgia, CEP 35400-000, Ouro Preto-MG, Brasil.
这是一篇在知识共享署名许可条款下发布的开放存取文章。Rev. Virtual Quim。©2021巴西化学学会1 universidade Federal de Ouro Preto,材料工程研究生,CEP 35400-000, Ouro Preto-MG,巴西。巴西乌罗普雷托联邦大学,冶金与材料工程系,生物与湿法冶金实验室,CEP 35400-000,乌罗普雷托mg。
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引用次数: 0
The Heterocycles in the Context of COVID-19 (Part 1): a Review with Highlights of the Pandemic 2019冠状病毒病背景下的杂循环(上):回顾疫情亮点
Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220021
R. Andrighetto, Vanessa Griebeler Sebastiani
This article is a mirror of the initial clippings of a project junior scientific initiation project and aims to make available a scientific text, in Portuguese language, built in the light of the main highlights that brought the chloroquine and hydroxychloroquine into the spotlight of the current pandemic context. In view of this context, the objective of this article, of an eminently theoretical nature, is to contribute to the delimitation of fundamental concepts in the field of organic chemistry. The methodology adopted for this descriptive and exploratory research, with a qualitative approach, consisted of systematically reviewing the literature, using indexed databases, to contextualize factual points about the historical origin (natural and synthetic) and the pharmacological properties of heterocycles correlated to the theme of COVID-19 pandemic. We approach concepts and structural chemical formulas that support the area of organic chemistry and, more specifically, heterocyclic chemistry. And, through this compilation, we present a way of quick access to the recent information anchored in journals of national and international impact.
本文反映了一个初级科学启动项目的初步剪录,目的是提供一份葡萄牙语的科学文本,根据使氯喹和羟氯喹成为当前大流行背景下的焦点的主要要点编写。鉴于这一背景,本文的目的是对有机化学领域的基本概念的界定作出贡献,这篇文章具有突出的理论性质。本描述性和探索性研究采用定性方法,包括系统地查阅文献,使用索引数据库,将与COVID-19大流行主题相关的杂环类药物的历史起源(天然和合成)和药理特性的事实点背景化。我们接近的概念和结构化学式,支持有机化学领域,更具体地说,杂环化学。并且,通过这种汇编,我们提供了一种快速访问国内和国际影响期刊上最新信息的方法。
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引用次数: 0
Plastic Wood Production from Mining Tailings and Plastic Waste: An Experimental Study 利用尾矿和废塑料生产塑料木材的试验研究
Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220080
Thaiany S. C. Bressiani, Lucas Lorenzini, Tainara R. Neves, Matheus B. Alvarenga, Sandra A. D. Ferreira, Paulo R. G. Moura, Maria de Fátima F. Lelis
The present work addresses the environmental issue of solid waste in an experimental chemistry class aiming to reduce mining and plastic waste to produce plastic wood. The activities were developed with the participation of undergraduate students from the Chemistry course (UFES – Universidade Federal do Espírito Santo) in the discipline “ Waste Treatment in the Environment” and students from the Civil Engineering course, that are using “ Environmental Education ” as theoretical support. The tailings used were characterized by XRD indicating the presence of SiO 2 (silica), Fe 2 O 3 (hematite) and Al 2 Si 2 O 5 (OH) 4 (kaolinite) as main components. The plastic wood sample produced showed surface aspects and color like those of natural wood. The preparation of a technological, sustainable, and economically viable product from waste was discussed in the classroom. Those experimental activities allowed a joint reflection with the students about the environmental issues and how the use of waste, to prepare new materials in the classroom, may promote transformative training, capable of influencing the future of these professionals and hopefully leading to more creative decision-making, with a focus on sustainable development and social responsibilities.
本研究在实验化学课堂上解决了固体废物的环境问题,旨在减少采矿和塑料废物生产塑料木材。这些活动是在“环境中的废物处理”学科的化学专业本科生(ues - universsidade Federal do Espírito Santo)和土木工程专业学生的参与下开展的,他们将“环境教育”作为理论支持。采用XRD对尾矿进行了表征,表明主要成分为sio2(二氧化硅)、fe2o3(赤铁矿)和al2si2o5 (OH) 4(高岭石)。制作的塑木样品表面和颜色与天然木材相似。在课堂上讨论了从废物中制备技术,可持续和经济上可行的产品。这些实验活动使学生能够共同思考环境问题,以及如何利用废物在课堂上准备新材料,促进变革性培训,能够影响这些专业人员的未来,并有希望导致更具创造性的决策,重点是可持续发展和社会责任。
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引用次数: 0
Electrocatalytic Performance of Pd/C and Pt/C for Power Generation from Sugarcane Extract in Direct Liquid Fuel Cell 直接液体燃料电池中Pd/C和Pt/C对甘蔗提取物发电的电催化性能
Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220140
Bruno D. Q. Villard, Nivaldo G.P. Filho, Paulo V.R. Gomes, J. Nandenha, Camila M. Godoi, Thais Lie Tagomori, N. Azeredo, Rodrigo F.B. de Souza, Almir O. Neto, Priscilla J. Zambiazi
The processing of biomass to obtain fuels such as ethanol results in generating waste and polluting the environment. However, to meet energy demand and simultaneously reduce environmental pollution, fuel cells are promising devices for converting chemical compounds into electricity. Fuel cells can be powered by various types of liquids, including the sugars available in sugarcane extract, with high energy potential. Fuel cells employ the use of noble metals as electrocatalysts, such as Pt or Pd, to carry out the oxidation of these fuels. In this sense, this work reports the study of the oxidation of sugarcane extract in these different noble metals. The platinum catalyst was shown to be more active for the oxidation of sugars, resulting in a power density 10 times greater than Pd/C using a 50% diluted sugarcane extract solution, resulting in promising fuel cell systems. To produce ecologically correct electrical energy for the industry in general.
加工生物质以获得诸如乙醇之类的燃料会产生废物并污染环境。然而,为了满足能源需求,同时减少环境污染,燃料电池是一种很有前途的将化合物转化为电能的设备。燃料电池可以由各种类型的液体提供动力,包括甘蔗提取物中的糖,具有很高的能量潜力。燃料电池使用贵金属作为电催化剂,如铂或钯,来进行这些燃料的氧化。从这个意义上说,本工作报道了甘蔗提取物在这些不同贵金属中的氧化研究。研究表明,铂催化剂对糖的氧化更有活性,使用50%稀释的甘蔗提取物溶液时,其功率密度是Pd/C的10倍,这是很有前途的燃料电池系统。为整个工业生产生态正确的电能。
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引用次数: 0
Synthetic and Biological Importance of Benzodiazepines: A Systematic Review 苯二氮卓类药物的合成和生物学重要性:系统综述
Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220107
Juliana G. de Morais, Clara S. C. Siqueira, Yasmine B. Queiroz, Vanessa C. S. Amaral, Luciana M. Ramos
Benzodiazepines (BZD) are heterocyclic compounds which stand out for their sedative, hypnotic, anxiolytic, and anticonvulsant activity. In order to develop more attractive syntheses based on literature data, this systematic review has analyzed the scientific articles on the synthesis and biological evaluation of benzodiazepine derivatives, application of catalysts, green solvents and strategic substitutions into this nucleus. A bibliographic research was performed in the Web of Science and PubMed databases and resulted in 522 articles. Among these, 80 of these articles met the inclusion criteria and were selected to compose this review. The structures that show better biological activity and the synthesis strategies to obtain these derivatives were reported. New perspectives in the synthesis of benzodiazepines were possible with this review.
苯二氮卓类(BZD)是一种杂环化合物,具有镇静、催眠、抗焦虑和抗惊厥作用。为了在文献资料的基础上开发出更有吸引力的合成方法,本系统综述分析了苯二氮卓类衍生物的合成和生物学评价、催化剂的应用、绿色溶剂和策略取代等方面的科学文章。在Web of Science和PubMed数据库中进行了书目研究,结果得出522篇文章。其中80篇符合纳入标准,入选本综述。报道了具有较好生物活性的结构及其合成策略。本综述为苯二氮卓类化合物的合成开辟了新的前景。
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引用次数: 0
Whey Protein Concentrate admixture of Turmeric Extract: The Effect Of Drying Method 姜黄提取物的乳清蛋白浓缩混合物:干燥法的效果
Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20230013
Jaqueline Vieira Piovezana-Gomes, P. Anunciação, Júlia d’Almeida Francisquini, Livya Alves Oliveira, L. F. Cappa de Oliveira, Antônio Fernandes de Carvalho, R. Stephani, Ítalo Tuler Perrone, Ceres Mattos Della Lucia
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引用次数: 0
Revisiting the History of Catalysis: Elizabeth Fulhame’s Contributions and Other Historical Aspects. 回顾催化的历史:伊丽莎白·富勒姆的贡献和其他历史方面。
Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220115
M. Gonçalves da Rocha, S. Nakagaki, Guilherme Sippel Machado Sippel Machado
Catalysis is one of the areas of science whose history is little explored in textbooks used in the teaching of chemistry, which rarely dedicate part of the text to tell how this knowledge was built. Nowadays, catalysis is one of the most important aspects of industrial, laboratory and sustainable chemistry. This paper is meant to make a historical review of how some great names in the history of chemistry built all this knowledge, with special attention to the work of Elizabeth Fulhame, a British scientist, who pioneered the research in catalytic chemical reactions. In addition, other names and contributions of several scientists to the history and development of catalysis will be discussed, as well as the Brazilian contribution to the production of knowledge in this field. This work aims to contribute to broaden the vision of one of the most important branches of modern chemistry in several fronts, including financial, environmental and social.
催化是科学的一个领域,其历史在化学教学中使用的教科书中很少探索,很少用部分文字来讲述这一知识是如何建立的。如今,催化是工业、实验室和可持续化学最重要的方面之一。本文旨在对化学史上的一些伟大人物是如何建立这些知识的进行历史回顾,并特别关注英国科学家伊丽莎白·富勒姆的工作,她是催化化学反应研究的先驱。此外,还将讨论其他几位科学家对催化的历史和发展的名字和贡献,以及巴西对这一领域知识生产的贡献。这项工作的目的是在包括金融、环境和社会在内的几个方面,为拓宽现代化学最重要的分支之一的视野做出贡献。
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引用次数: 0
Oxidative Stress and Nox: Related Diseases and Main Classes of Synthetic and Natural Inhibitors 氧化应激与氮氧化物:相关疾病及合成和天然抑制剂的主要类别
Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220113
Keoma K. L. Cavalcante, Gabrielle C. Calegari, A. Orsato, Carla C. Perez
The oxidative stress is a biological condition resulting from an imbalance in the Reactive Oxygen Species production, which occurs mainly through the NADPH oxidase (NOX), a transmembrane enzyme that acts in a pro-inflammatory mechanism. Due to the toxicity of these species to living tissue, this condition has been studied over the years as a leading cause of human disease, affecting from heart and lung tissues to the Central Nervous System. This work brings important information about the several diseases related to the Oxidative Stress condition, their origins and main causes, as well as raising data from the last years about the antioxidant compounds, anti-inflammatory and NOX inhibitors used in their prevention over the last years. Compounds such as carboxylic acids and phenolics esthers amides and peptides are reported in this work to have important structural characteristics in the activity against oxidative burst and its various modulations.
氧化应激是一种由活性氧产生不平衡引起的生物学状况,主要通过NADPH氧化酶(NOX)发生,这是一种跨膜酶,在促炎机制中起作用。由于这些物种对活组织的毒性,这种情况多年来一直被研究为人类疾病的主要原因,影响从心脏和肺组织到中枢神经系统。这项工作带来了与氧化应激条件相关的几种疾病的重要信息,它们的起源和主要原因,以及从过去几年来关于抗氧化化合物、抗炎和氮氧化物抑制剂在过去几年用于预防这些疾病的数据。羧酸类、酚类、醚类、酰胺类和多肽等化合物在抗氧化爆发及其各种调节活性中具有重要的结构特征。
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引用次数: 0
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Revista Virtual de Química
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