Results 11 to 20 of about 1,441,968 (290)

Monitoramento atmosférico passivo de SO2, NO2 e O3 em áreas urbanas e de influência industrial como prática de química ambiental para alunos de graduação Atmospheric passive monitoring of SO2, NO2 and O3 in urban areas and in those under industrial influence as an environmental chemistry experiment for undergraduate students

Química Nova, 2006
This study is a result of undergraduate student participation in the Environmental Chemistry discipline provided by the Chemistry Institute/UFBA. The students were involved in the development of passive samplers, a project of the LAQUAM (Environmental ...
Vânia P. Campos, Lícia P. S. Cruz, Eagles M. Alves, Tatiane de S. Santos, Adriano D. Silva, Ana C. C. dos Santos, Angelo M. V. Lima, Carine S. Paixão, Daniele C. M. B. Santos, Denise S. Brandão, Elisângela J. S. Andrade, José I. Moreira Jr., Karla C. S. Conceição, Márcia de S. Ramos, Maria C. G. Pontes, Misael F. do Amaral, Rosiene R. Mattos   +16 more
doaj   +1 more source

Efficient and durable uranium extraction from uranium mine tailings seepage water via a photoelectrochemical method

iScience, 2021
Summary: Current photocatalytic uranium (U) extraction methods have intrinsic obstacles, such as the recombination of charge carriers, and the deactivation of catalysts by extracted U. Here we show that, by applying a bias potential on the photocatalyst,
Yin Ye, Jian Jin, Yanru Liang, Zemin Qin, Xin Tang, Yanyue Feng, Miao Lv, Shiyu Miao, Cui Li, Yanlong Chen, Fan Chen, Yuheng Wang   +11 more
doaj   +1 more source

Ferro zero: uma nova abordagem para o tratamento de águas contaminadas com compostos orgânicos poluentes Zero-valent iron: a new approach for treatment of waters contamined with organic pollutants

Química Nova, 2005
Anthropogenic pollution of groundwater and surface water has become a very serious environmental problem around the world. A wide range of toxic pollutants is recalcitrant to the conventional treatment methods, thus there is much interest in the ...
Wellington S. Pereira, Renato S. Freire
doaj   +1 more source

Hormônios sexuais estrógenos: contaminantes bioativos Sexual estrogenic hormones: bioactive contaminants

Química Nova, 2006
Natural and synthetic estrogens have been detected in rivers, lakes and estuaries in several parts of the world. The primary sources of these compounds are the industrial and household effluents, which are not eliminated by the received treatment.
Ricardo Wagner Reis Filho, Juliana Coutinho de Araújo, Eny Maria Vieira   +2 more
doaj   +1 more source

A Model Assessment of the Occurrence and Reactivity of the Nitrating/Nitrosating Agent Nitrogen Dioxide (^•NO₂) in Sunlit Natural Waters

Molecules, 2022
Nitrogen dioxide (•NO2) is produced in sunlit natural surface waters by the direct photolysis of nitrate, together with •OH, and upon the oxidation of nitrite by •OH itself. •NO2 is mainly scavenged by dissolved organic matter, and here, it is shown that
Davide Vione
doaj   +1 more source

Computer-Assisted Design of Environmentally Friendly and Light-Stable Fluorescent Dyes for Textile Applications. [PDF]

, 2019
Five potentially environmentally friendly and light-stable hemicyanine dyes were designed based on integrated consideration of photo, environmental, and computational chemistry as well as textile applications.
Chen, Guoqiang, Sun, Gang, Tang, Songsong   +2 more
core   +1 more source

Assembly and Curation of Lists of Per- and Polyfluoroalkyl Substances (PFAS) to Support Environmental Science Research

Frontiers in Environmental Science, 2022
Per- and polyfluoroalkyl substances (PFAS) are a class of man-made chemicals of global concern for many health and regulatory agencies due to their widespread use and persistence in the environment (in soil, air, and water), bioaccumulation, and toxicity.
Antony J. Williams, Linda G. T. Gaines, Christopher M. Grulke, Charles N. Lowe, Gabriel F. B. Sinclair, Vicente Samano, Inthirany Thillainadarajah, Bryan Meyer, Grace Patlewicz, Ann M. Richard   +9 more
doaj   +1 more source

Chlorophylls - natural solar cells [PDF]

, 2011
A molecular modeling study was conducted on a series of six natural occurring chlorophylls. Quantum chemistry calculated orbital energies were used to estimate frequency of transitions between occupied molecular orbital and unoccupied molecular orbital ...
Balan, Mugur C., Bolboaca, Sorana D., Jantschi, Lorentz, Sestras, Radu E.   +3 more
core   +3 more sources

Analysis of the relationship between students’ argumentation and chemical representational ability: a case study of hybrid learning oriented in the environmental chemistry course

Chemistry Teacher International, 2023
Engaging students in collaborative learning fosters the expression of ideas, deepens understanding, and hones argumentation skills. Argumentation is pivotal, and instructors should facilitate opportunities for its practice.
Ramadhani Dimas Gilang, Yamtinah Sri, Saputro Sulistyo, Widoretno Sri   +3 more
doaj   +1 more source

Review of trace toxic elements (Pb, Cd, Hg, As, Sb, Bi, Se, Te) and their deportment in gold processing. Part 1: Mineralogy, aqueous chemistry and toxicity [PDF]

, 2011
A literature review on the deportment of trace toxic elements (Pb, Cd, Hg, As, Sb, Bi, Se, and Te) in gold processing by cyanidation is presented which compiles the current knowledge in this area and highlights the gaps.
Breuer, P.L., Bunney, K.G., Kyle, J.H., May, P.M., Pleysier, R.   +4 more
core   +2 more sources