Construção e otimização de um reator de baixo custo para a fotodegradação da matéria orgânica em águas naturais e sua aplicação no estudo da especiação do cobre por voltametria

Campos, M. L. A. M.; Mello, Ligia C.; Zanette, Dino; Sierra, Maria Marta de Souza; Bendo, Anderson

doi:10.1590/s0100-40422001000200018

Cited by 13 publications

(9 citation statements)

References 13 publications

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“…For total metal content determination by square wave anodic stripping voltammetry (SWASV), aliquots of A fractions were previously conditioned to approximately pH 1 adding HNO 3 (concentrated, Merck), transferred to PTFE bottles, and exposed to UV radiation for at least 12 h for organic matter oxidation (Campos et al 2001). Complexing capacity of the SRB: sample conditioning and ASV-monitored titration B fractions were used to determine complexing capacity (CC).…”

Section: Srb Sampling and Determination Of Total Metal Concentrationmentioning

confidence: 99%

Complexing capacity of electroplating rinsing baths—a twist to the resolution of two ligand families of similar strength

2016

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Background: The presence of ligands affects metal behavior when removing metals from wastewaters. So far, most of the attention has been paid to strong ligands; however, experimental observations indicate that also weaker complexing agents may play a key role in the availability of metals in waters and in the success of the treatment to be applied. In particular, we have analyzed wastewaters of an electroplating facility during an 8-h workday. Total metal content (copper, zinc, cadmium, and lead) was determined; ligands were characterized by concentration (Lt) and strength (conditional stability constant, K'f). This work focuses on ligands of moderate strength which, as far as we know, have been overlooked in the literature.

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Section: Srb Sampling and Determination Of Total Metal Concentrationmentioning

confidence: 99%

Complexing capacity of electroplating rinsing baths—a twist to the resolution of two ligand families of similar strength

2016

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“…Samples were immersed in a quartz tube containing 10 mL of hydrogen peroxide under UV light in a photochemical reactor manufactured according to Campos et al 13 . The reactor was equipped with a 14-1000 W high-pressure Hg lamp and operated at a constant temperature of 40 °C for 40 min.…”

Section: Acrylic Acid Grafting Copolymerizationmentioning

confidence: 99%

Surface characterization and osteoblast-like Cells culture on collagen modified PLDLA scaffolds

et al. 2014

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Surface modification techniques based on the grafting of chemical functional groups and immobilization of bioactive molecules have been used to improve biocompatibility and clinical performance of bioabsorbable scaffolds in tissue engineering and medicine regenerative applications. This study aimed at developing and characterizing a biomimetic surface to stimulate bone regeneration by a simple and low-cost method of surface biofunctionalization of the poly (L-co-D,L lactic acid)-PLDLA scaffolds. The method was obtained by grafting reaction of carboxyl groups (-COOH) on their surface via acrylic acid (AAc) polymerization process, followed by immobilization of collagen type I (Col). Such approach resulted in a surface morphology markedly modified after treatment, with increase of pores and roughness on PLDLA-AAc surfaces and a network of fibrillar collagen deposition in nonspecific areas of PLDLA-Col surfaces. The cytocompatibility of collagen-immobilized scaffolds was significantly improved in terms of cellular adhesion, proliferation, collagen synthesis and maintenance of osteoblast-like phenotype, indicating, therefore, the fundamental role of collagen protein over the biological interactions that occur by bio-recognition mimetic mechanisms at biomaterials interface. These results indicate that the surface modification method used here may be useful as a strategy to develop biofunctional scaffolds, which provide a more successful clinical application of biomaterials in the tissue engineering field.

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“…Also Cd(II) removal was checked in cell supernatants. For that purpose aliquots were transferred to PTFE bottles, acidified with HNO 3 (c) and exposed to UV radiation for at least 12 h for organic matter oxidation (Campos et al 2001;Ndung 0 u et al 2003). In all samples, Cd(II) concentration remaining after Chelex 100 treatment was below detection limit (in our case 5 9 10 -8 M).…”

Section: Preliminary Considerations To the Titration Proceduresmentioning

confidence: 99%

Effect of bacterial growth in the complexing capacity of a culture medium supplemented with cadmium(II)

Ceretti

Vullo

Zalts

et al. 2009

World J Microbiol Biotechnol

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The aim of this study was to evaluate complexing capacity (CC) accompanying microbial growth in a metal supplemented culture medium. A combined strategy of square wave anodic stripping voltammetry (SWASV) monitored titration and ion-exchange resins treatment (Chelex 100) has been applied. Culture medium, supplemented with Cd(II) in excess to ligands, was inoculated with an indigenous bacterial culture; total ligand concentration and stability constants were determined at different bacterial growth stages. As far as known, determination of CC in such conditions has not been reported (usually ligands in natural or wastewaters exceed metal concentration). HIDA, (N-(2-hydroxyethyl)iminodiacetic acid), was used as a model ligand to mimic soluble products derived from the resin treatment and bacterial metabolism. Ligand concentration, Lt (1.3 ± 0.1 lM), and the conditional stability constant, K 0 , (log K 0 = 5.7 ± 0.2) were in good agreement with expected values (1.0 ± 0.1 lM and log K 0 = 6.1). In the supplemented culture medium, total ligand concentration in the micromolar range (60-80 lM) and conditional stability constants (5.5 \ log K 0 \ 6.5) were determined. Cd(II) complexes detected in the different stages of microbial growth are labile from an electrochemical point of view. Results were compared to the case of Cd(II) non-supplemented broth.

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Construção e otimização de um reator de baixo custo para a fotodegradação da matéria orgânica em águas naturais e sua aplicação no estudo da especiação do cobre por voltametria

Cited by 13 publications

References 13 publications

Complexing capacity of electroplating rinsing baths—a twist to the resolution of two ligand families of similar strength

Complexing capacity of electroplating rinsing baths—a twist to the resolution of two ligand families of similar strength

Surface characterization and osteoblast-like Cells culture on collagen modified PLDLA scaffolds

Effect of bacterial growth in the complexing capacity of a culture medium supplemented with cadmium(II)

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