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Immobilization of azo-dyes for optical detection of metal ions in water: reaction with Pd(II) [palladium]
2001
Savic, J. | Vasic, V. (Institut za nuklearne nauke "Vinca", Beograd (Yugoslavia). Laboratorija za fizicku hemiju)
The reaction of Pd(II) with 1,8-dihydroxy-2-(pyrazol-5-ylazo)-naphthalen-3,6-disulphonic acid immobilized by physical sorption onto Dowex 1-X8 ion-exchange resin was investigated with the aim to develop the sorption-spectroscopic test method for the detection of low Pd(II) concentrations in water. The resin phase absorption spectra of the reagent and its Pd(II) complex were followed. The immobilized reagent has the spectral characteristics similar to those in the water and forms with Pd(II) 1:1 complex with the absorption maximum at 650 nm. Parameters, such as pH, wavelength and contact time have been optimized for a given amount of the sorbed reagent. The experimental conditions for the linear dependence of absorbance vs. Pd(II) concentration have been determined.
Afficher plus [+] Moins [-]Effect of low molecular weight carboxylic acids on degradation of textile dye with UV/H2O2 process | Uticaj nižih karboksilnih kiselina na degradaciju tekstilne boje UV/H2O2 procesom
2012
Velinov, N., Prirodno-matematički fakultet, Niš (Serbia) | Najdanović, S., Prirodno-matematički fakultet, Niš (Serbia) | Mitrović, J., Prirodno-matematički fakultet, Niš (Serbia) | Radović, M., Prirodno-matematički fakultet, Niš (Serbia) | Bojić, D., Prirodno-matematički fakultet, Niš (Serbia) | Bojić, A., Prirodno-matematički fakultet, Niš (Serbia)
This study investigates the effect of low molecular weight carboxylic acid on degradation of textile dye C.I. Reactive Orange 16 (RO16), in function of initial pH, using Ultra Violet light and H2O2. Experiments were performed in photoreactor with UVC lamps in stationary conditions. Results shows that carboxylic acids have inhibitory effect on degradation process of dye. With increasing concentration of dye inhibitory effect grows. Inhibitory effect of acid are higher on pH values of solution higher than pKa acids, because than in solution acids appear almost entirely in the form of anion. The highest inhibitory effect shows formates, smaller propanoates, and the smallest acetates. UV/H2O2 process is very effective for removal of organic pollutants, but the efficiency of this process was significantly lower in the presence of lower carboxylic acids.
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