Showing papers in "Dyes and Pigments in 2003"

TL;DR: The use of whole bacterial cells for the reduction of water-soluble dyes present in textile dyeing wastewater has been investigated in this paper, with a focus on the use of bacteria-polymer composites for the removal of colour from reactive dye effluents.

TL;DR: In this paper, an acid dye, acid yellow 36, was used as the adsorbate for the removal of acid dyes from aqueous solution and the results showed that a pH value of 3 is favorable for the adsorption of acid dye.

TL;DR: In this article, the degradation of a triphenylmethane dye (gentian violet, 1) was investigated in aqueous suspensions of titanium dioxide under a variety of conditions.

TL;DR: In this paper, a fine powder of Neem leaves was used to remove the dye Brilliant Green from aqueous solution, in a batch process with different concentrations of the dye and different adsorbent doses, at a range of pH values and temperature.

TL;DR: In this article, the potential application of adsorbents produced from sewage sludge in organic pollutants removal was investigated. But the results showed that activated carbons made from sludge showed promising for the removal of organic pollutants from aqueous streams.

TL;DR: In this article, the adsorption of malachite green (MG) from aqueous medium by rice husk-based porous carbons (RHCs) was studied.

TL;DR: In this paper, the ozone oxidation of woollen textile dyeing effluent consisting of wastewater generated from spent dye baths and first and second rinses (remaining composite wastewater) was investigated, and the results indicated that 40 min ozonation of biologically treated wastewater yielded almost colorless effluent with a decolorization efficiency of around 98% and with a corresponding ozone absorption rate of 58.0 mg/l.

TL;DR: In this paper, the photochemical decolorization of three dyes, namely acid orange 8 (AO8), acid blue 74 (AB74) and Methyl Orange (MO), was studied in the UV/hydrogen peroxide process by using a continuous photochemical reactor with a 15 W low pressure mercury lamp.

TL;DR: In this paper, the authors describe the dyeing of natural and man-made fibres, in supercritical carbon dioxide, with C.I. Disperse Yellow 23 modified with 2-bromoacrylic acid and 1,3,5-trichloro-2,4,6-triazine as reactive groups.

TL;DR: The use of phenothiazinium dyes in the photodynamic therapy of cancer and its related antimicrobial protocols, eg blood product decontamination, has been mainly limited to a few commercially available dyes, such as Methylene Blue, the Azure stains and Toluidine Blue O Novel Mmethylene Blue derivatives are scarce in the literature, and yet there are various synthetic routes available to furnish sufficient candidate compounds for properly organized programmes of photosensitiser design and development to be carried out as mentioned in this paper.

TL;DR: In this article, the authors give an overview of the processes most commonly used and the state of development of recent electrochemical innovations, including indirect electrochemical reducing employing a redox mediator, direct electrochemical reduction of indigo via the indigo radical, electrocatalytic hydrogenation, and direct indigo itself on graphite.

TL;DR: In this paper, the decolorization of six vinylsulphone reactive dyes (C.I. Reactive Yellow 15, C.I Reactive Red 22, CI.Reactive Blue 28, Remazol Dark Black N 150%, C.

TL;DR: In this article, the antimicrobial properties of cationic dyes were investigated by using FTIR, 1 H-NMR and 13 C NMR analysis, and their color characteristics were studied in terms of λ max and e max in aqueous solution.

TL;DR: In this paper, six vinylsulphone reactive dyes were decolorised using three oxidation processes (H2O2/UV, H2O 2/O3 and H2 O2/Fe2+), and the efficiency of decolorisation was measured by decolorization time, absorbance, COD and TOC.

TL;DR: In this paper, a more sensitive quantification HPLC method for analyzing the main flavonoids of weld (Reseda luteola L) is presented, and several extraction temperatures and solvent mixtures have been compared.

TL;DR: In this article, the piperazine substituted naphthalimide model compounds 2-methyl-6-(4methyl-piperazin-1-yl)-benzo[de] isoquinoline-1,3-dione (NA1), 2.5-4-dimethylpiperazerazin 1-yl) and 2.6-4dimethyl piperzerazin (4,4ddimethyl PiperazIN-1]-benzo [de]-isopropyl iodide (NA2) were synthesized

TL;DR: In this paper, both symmetrical and symmetrical bis(hetaryl)azo dyes were prepared by diazotisation-coupling and oxidation reactions in low to good yields, and their absorption maxima were observed in the range of 427-631 nm.

TL;DR: In this paper, mica pigments based on mica flakes covered with surface oxide-hydroxide layer of different metals, such as Ti, Cr, Fe, Al, Co, Ni, Zn and Cu were prepared by homogeneous precipitation of metal sulphates with urea in the presence of mica flakes.

TL;DR: Some tetrakis(3-trifluoromethylphenoxy)phthalocyanine complexes with cobalt, nickel or zinc were synthesized and their structures were confirmed by IR, UV-vis, 1H NMR and elemental analysis.

TL;DR: The synthesis, characterisation and properties of polycyclic barbiturate pigments are described in this article, where the pigments have been tested as colourants for plastic and paint and the results of lightfastness, heatfastness and contact bleed tests are reported.

TL;DR: The optical properties of six new 3,3′-phenylene-biscoumarin dyes, differing by the substitution pattern of the central phenyl group and by the presence of methoxy substituents, were investigated in CH 2 Cl 2 by UV/vis absorption and fluorescence spectroscopy as discussed by the authors.

TL;DR: In this paper, a dye acid red 114 (C.I. 23635) was photochemically removed by adding ferric ion (Fe3+), TiO2 particles, and H2O2 in the presence of the UV radiation.

TL;DR: It is found that reactive dyes also have a high ability to adsorb on fiber in a reverse micellar system and fixation of reactive dye on fiber could be attained in reverse miceLLar system.

TL;DR: In this paper, the influence of variables (NaOH, NaCl, urea, intensity of UV irradiation, concentration of H2O2 and decoloration time) on textile waste waters by the use of experimental design is described.

TL;DR: The photophysical and photochemical properties of an azlactone derivative, 4-(p-N,N-dimethylaminophenylmethylene)-2-phenyl-5-oxazolone, (DPO) in a sol-gel matrix have been examined in this article.

TL;DR: The enthalpy of azo and hydrazone tautomers (A & H Ts) of 1-phenylazo-2-naphthols, 2-and 4-phenylonazo-1-Naphthol-2 -sulfonic acids was estimated both in the gaseous phase and in water using a semi-empirical molecular orbital PM5 and COSMO method as mentioned in this paper.

TL;DR: In this paper, a series of novel azocalix[4]arene dyes (1, 12) were prepared by linking o-, m-, p-chloroaniline and aniline through a diazo-coupling reaction.

TL;DR: In this article, the synthesis and characterisation of 4,5-octasubstituted metal free and metallo (ZnII and CoII) phthalocyanines carrying four alkylthio groups and four tridentate NNS substituents on periferal positions are reported.

TL;DR: The photofading mechanism of 16 commercial dyes (8 Procion, 8 Remazol) reactively dyed on cotton is investigated in this paper, showing that fading is caused by both visible and UV light, with visible light being the dominant factor for azo dyes and UV for phthalocyanines.

TL;DR: In this paper, a new synthetic strategy for the generation of methine cyanine dyes with asymmetrical structures has been developed based on a modified Vilsmeier reaction and the condensation reaction of indoline derivatives with organic pyridinium iodide or 4-diphenylamino-benzaldehyde.