Revista Virtual de Química最新文献_第7页

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

Revista Virtual de Química 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

{"title":"Impact Assessment of 2020 COVID-19 Lockdown on Landfill Leachate Treatment in Rio de Janeiro","authors":"R. Soares, Beatriz César Maestá, Felipe Debize da Motta, R. Naegele, Carlos Eduardo Soares Canejo Pinheiro da Cunha","doi":"10.21577/1984-6835.20220066","DOIUrl":"https://doi.org/10.21577/1984-6835.20220066","url":null,"abstract":"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.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89511639","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

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

Revista Virtual de Química 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

{"title":"Phytochemical Characterization and Chemical Stability of Green Tea Extract","authors":"Ana Paula Azevêdo Macêdo, Mariane dos Santos Gonçalves, Oscar Caetano da Silva Neto, Ricardo David Couto, Jorge Mauricio David","doi":"10.21577/1984-6835.20220069","DOIUrl":"https://doi.org/10.21577/1984-6835.20220069","url":null,"abstract":"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.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90264474","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

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

Revista Virtual de Química Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220078

Rodrigo F. Gomes, Matheus M. Pereira, Versiane A. Leão

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

Revista Virtual de Química Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220021

R. Andrighetto, Vanessa Griebeler Sebastiani

{"title":"The Heterocycles in the Context of COVID-19 (Part 1): a Review with Highlights of the Pandemic","authors":"R. Andrighetto, Vanessa Griebeler Sebastiani","doi":"10.21577/1984-6835.20220021","DOIUrl":"https://doi.org/10.21577/1984-6835.20220021","url":null,"abstract":"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.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"119 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78554309","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

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

Revista Virtual de Química 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

{"title":"Plastic Wood Production from Mining Tailings and Plastic Waste: An Experimental Study","authors":"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","doi":"10.21577/1984-6835.20220080","DOIUrl":"https://doi.org/10.21577/1984-6835.20220080","url":null,"abstract":"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.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75400341","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

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

Revista Virtual de Química 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

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

Revista Virtual de Química 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

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

Revista Virtual de Química 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

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。

Revista Virtual de Química Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220115

M. Gonçalves da Rocha, S. Nakagaki, Guilherme Sippel Machado Sippel Machado

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

Revista Virtual de Química Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220113

Keoma K. L. Cavalcante, Gabrielle C. Calegari, A. Orsato, Carla C. Perez

引用次数: 0