In this work, rietveld refinement, morphology and optical properties of β-Ag2MoO4 microcrystals were synthesized by the precipitation method using different polar solvents: water, methanol, ethanol, 1-propanol and 1-butanol.

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This manuscript reports the synthesis of twenty 3,5-diaryl-1,2,4-oxadiazole derivatives, nine of which are novel compounds. The amidoxime reaction with acyl chlorides obtained from substituted benzoic acids was used. All compounds were tested against five standard (American Type Culture Collection (ATCC)) bacteria: Escherichia coli, Pseudomonas aeruginosa, Enterococcus faecalis, Proteus mirabilis and Staphylococcus aureus. Screening assays were carried out using agardiffusion technique, in which 100 μM heterocyclic compounds solutions (20% dimethylsulfoxide/ water) were employed. The minimum inhibitory concentrations (MIC) of the active compounds were determined by serial dilutions at decreasing concentrations in microtiter plates. The nitrated derivatives gave the best test results, where MIC = 60 μM (E. coli) was the lowest value found for an ortho-nitrated derivative. The activity of these compounds possibly involves a mechanism via free radicals. S. aureus and P. aeruginosa were resistant to all compounds.

The literature reports a growing number of publications involving 1,2,4oxadiazoles over recent years, which have been focused on its different pharmacological potentials. Although this review presents the two main methodologies for synthesis of this heterocycle, namely 1,3-dipolar cycloaddition of nitrile oxide and the amidoxime route, the main objective was to report pharmacological applications associated with this heterocycle, as well as some promising results related to this set of applications.

Phenolic derivatives are compounds that do not occur naturally in water. The presence of phenols in environment is due to human activity. These compounds have been detected in effluents from different industries, such as: petrochemical, pulp and paper, pharmaceutical, textile, coal mining, coke industry, etc. The Brazilian Law establishes the value of 0.5 mg/L as maximum concentration of these derivatives in water, however in some industries the concentration can reach 2000 mg/L. This manuscript reports the main techniques used for the removal of phenolic derivatives from industrial wastewater, such as: wet air oxidation, biological degradation, use of organic or inorganic adsorbents. Additionally, some aspects about the toxicity are presented.Keywords: Phenolic derivative; adsorbent; industrial wastewater; environment. ResumoDerivados fenólicos são compostos que não ocorrem naturalmente em corpos d'água. A presença de fenóis no meio ambiente está associada à atividade humana. Estes compostos são encontrados em rejeitos de diferentes tipos de indústrias, tais como: petroquímica, papel e celulose, farmacêutica, têxtil, mineradoras, coquerias, entre outras. A legislação brasileira estabelece o valor de 0,5 mg/L como a concentração máxima destes derivados em água. Entretanto, no efluente de algumas indústrias a concentração pode alcançar 2000 mg/L. Este artigo reporta as principais técnicas utilizadas para remoção de derivados fenólicos de efluentes aquosos industriais, tais como: oxidação por ar úmido, degradação biológica, uso de adsorventes orgânicos ou inorgânicos. Adicionalmente, são apresentados alguns aspectos associados à toxidez destes poluentes.Palavras-chave: Derivados fenólico; adsorvente; efluentes industriais; meio ambiente.