This work describes the removal of pesticides from water using activated and magnetized biochars produced from exhausted husk, and dry tannin from barks of black wattle (Acacia mearnsii De Wild.). These materials were characterized using chemical, spectroscopic, thermal, solid structure and surface area techniques. The activated and magnetized biochars were effective in removing the pesticides thiacloprid and thiamethoxam from both ultrapure water and Marcela Water Reservoir, Itabaiana, Sergipe State, Brazil. At the longest time examined, the amounts of thiacloprid and thiamethoxam adsorbed per gram of activated biochar adsorbent were 1.02 and 0.97 mg, respectively, while values of 0.73 mg (thiacloprid) and 0.40 mg (thiamethoxam) were obtained using magnetized biochar. A pseudo-second order model correctly described the kinetics of adsorption of both pesticides (R(2) ≥ 0.922). Desorption experiments revealed that the spent biochars could not be easily regenerated, which indicated that the forces holding the adsorbed fluid molecules to the solid surface were relatively strong.

In this study were analyzed the main lines of health care waste at the Hospital of the Federal University of Paraná (HC/UFPR), performing an inventory that aims from awareness, characterization, until a viable wastewater treatment proposal for the institution. In this context, were emphasized physical and chemical analyses parameters, inorganic species following the legislation, as well as some chemical analysis used as support for the investigation of the environmental standard of hospital wastewater. The UFPR Clinical Hospital has a health care waste management plan, which is focused on the issue of solid waste. Thus, there are no policies, procedures and specific supervision for managing wastewater, which causes the waste to be disposed directly in the sewage network. At work in question was the physicochemical characterization, inorganic species other relevant chemical species and toxicological analysis of four collection points. Depending on the physical and chemical parameters, phenols and monitored toxicological analysis, one realizes that the hospital sewage characteristics are different from domestic sewage, which in principle suggests the need for special treatment. In this work, the behavior of the wastewater points of HC/UFPR against three types of treatment. The tests performed by the method of activated carbon, Fenton and photoFenton process.

Uma série de novas Bases de Mannich (HL1-HL13) derivadas da 2-hidroxi-1,4-naftoquinona (lausona), benzaldeídos substituídos [C6H2R¹R²R³C(O)H] e várias aminas primárias (NH2R4, R4 = n-butil, benzil, alil, 2-furfuril) e seus complexos de Cu2+, [Cu(L1)2]-[Cu(L13)2], foram sintetizados e caracterizados por métodos analíticos e espectroscópicos. As estruturas dos complexos 1(R¹ = R² = R³ = H; R4 = Bu), 2(R¹ = R³ = H; R² = NO2; R4= Bu) e 7(R¹ = OH; R² = R³ = H; R4= Bu) foram determinadas por estudos de difração de raios-X de monocristal. Todos os compostos cristalizam em grupos espaciais centrossimétricos, com um cobre no centro de inversão. Dois L- coordenam-se através dos átomos de oxigênio do naftalen-2-olato e do nitrogênio da amina secundária, formando anéis quelatos de seis membros ao redor do átomo de cobre em um ambiente trans-N2O2. A atividade antimicrobial de todos os compostos foi testada em sete diferentes linhagens de bactérias: Bacillus cereus, Bacillus subtilis, Escherichia coli, Enterococcus faecalis, Klebsiella pneumoniae, Pseudomonas aeruginosae Staphylococcus aureus. Em geral, as bases de Mannich foram mais ativas que os complexos, sendo HL11(R¹ = OH; R² =H; R³ = Me; R4= Bn) e HL13(R¹ = OH; R² = H; R³ = Br; R4= Bn) os inibidores mais potentes. O MIC para o composto mais ativo HL11contra S. Colifoi 20 µmol L-1 (8 µg mL-1), melhor que o cloranfenicol (90 µmol L-1) e bem abaixo da maioria dos valores descritos para outras naftoquinonas.

A series of novel Mannich bases (HL1-HL13) derived from 2-hydroxy-1,4-naphthoquinone (lawsone), substituted benzaldehydes [C6H2R¹R²R³C(O)H] and various primary amines (NH2R4, R4 = n-butyl, benzyl, allyl, 2-furfuryl), and their Cu2+ complexes, [Cu(L1)2]-[Cu(L13)2], have been synthesized and fully characterized by analytical and spectroscopic methods. The structures of complexes 1(R¹ = R² = R³ = H; R4 = Bu), 2(R¹ = R³ = H; R² = NO2; R4= Bu) and 7 (R¹ = OH; R² = R³ = H; R4= Bu) were determined by single crystal X-ray diffraction studies. All complexes crystallize in centrosymmetric space groups, with a copper atom in the inversion centre. Two L- coordinate through the naphthalen-2-olate oxygen and secondary amine-N atoms, forming six-membered chelate rings around the copper atom in a trans-N2O2 environment; spectroscopic data confirm that the other complexes exhibit similar molecular arrangement. The antimicrobial activity of all compounds has been tested on seven different strains of bacteria: Bacillus cereus, Bacillus subtilis, Escherichia coli, Enterococcus faecalis, Klebsiella pneumoniae, Pseudomonas aeruginosaand Staphylococcus aureus. In general, Mannich bases were more active than complexes, HL11(R¹ = OH; R² =H; R³ = Me; R4= Bn) and HL13(R¹ = OH; R² = H; R³ = Br; R4= Bn) being the most potent inhibitors. The MIC for the most active compound HL11against S. Coliwas 20 µmol L-1 (8 µg mL-1), better than Chloramphenicol (90 µmol L-1) and well below most values reported for other naphthoquinones.

Neste trabalho, reportamos a síntese, caracterização e atividade de catecolase do complexo binuclear de cobre [Cu2(H2bbppnol)(mi-OAc)(mi-ClO 4)] ClO4·H2O·EtOAc contendo o ligante N,N'-2-hidroxibenzil-N,N' -2-piridilmetil-2-hidroxipropano-1,3-diamina (H3bbppnol). O complexo foi caracterizado através de espectroscopias no infravermelho e eletrônica, ressonância paramagnética eletrônica, medidas de susceptibilidade magnética e cristalografia de raios-X. A atividade de catecolase do complexo foi determinada espectrofotometricamente, monitorando-se a oxidação do substrato 3,5-di-terc-butilcatecol à correspondente o-benzoquinona, em solução de metanol saturada com O2/tampão aquoso (pH 8), a 25 ºC. O complexo mostrou-se capaz de oxidar o substrato modelo com uma constante catalítica de 0,0057 s-1.

The synthesis, characterization and catecholase activity studies of the complex [Cu2(H2bbppnol)(mu-OAc)(mu-ClO 4)]ClO4·H2O·EtOAc containing the dinucleating ligand N,N'-2-hydroxybenzyl-N,N' -2-pyridylmethyl-2-hydroxypropane-1,3-diamine (H3bbppnol) are presented here. The complex was characterized by IR, electronic and EPR spectroscopies, cyclic voltammetry, magnetic susceptibility measurements and X-ray crystallography. The catecholase-like activity of the complex was determined spectrophotometrically by monitoring the oxidation of 3,5-di-tert-butylcatechol to the corresponding o-benzoquinone in O2-saturated methanol/aqueous buffer (pH 8) mixtures at 25ºC. The complex was able to oxidize the model substrate with a turnover number of 0.0057 s-1.