Showing papers in "Dyes and Pigments in 2004"

TL;DR: In this article, the potential use of Indian Rosewood ( Dalbergia sissoo ) sawdust, pretreated with formaldehyde and sulphuric acid, for the removal of methylene blue dye from simulated wastewater was investigated.

TL;DR: In this paper, the specific case of aromatic amines arising from the reduction of the azo bond of azo colorants is addressed, with emphasis on the recalcitrance of azos dyes, their demonstrated vulnerability to azos bond reduction through different mechanisms and the lack of data on the biodegradability of the resulting amines.

TL;DR: In this article, a batch system was applied to study the adsorption of four reactive dyes, three acid dyes and one direct dye from aqueous solutions by the cross-linked chitosan beads, which had very large values of 1911−2498 (g/kg) at pH 3−4, 30°C, which were 3.4−15.0 and 2.7−27.4 times those of the commercial activated carbon and chitin, respectively.

TL;DR: In this article, the effects of adsorbent surface change, initial pH, initial dye concentration, adsorbents mass and contact time on dye removal have been determined, which indicated that PCSD and PCSDC could be employed as low-cost alternatives in wastewater treatment for the removal of dyes.

TL;DR: In this paper, the photooxidation of a chlorotriazine reactive azo dye Reactive Orange 4 has been carried out in the presence of H2O2 using UV-A light.

TL;DR: In this paper, the effect of pH and coagulant dosage as well as the effects of contact time and a powdered activated carbon dosage on dye removal have been studied and a two-step Al(III) coagulation/activated carbon adsorption method was designed to investigate the removal of reactive dyes, C.I. Reactive Red 45 and C.

TL;DR: The photochemical decolourisation of chlorotriazine reactive azo dye Reactive Orange 4 (RO4) has been carried out by Fenton and photo-Fenton processes as discussed by the authors.

TL;DR: In this paper, the adsorption mechanism of three reactive azo dyes (Reactive Black 5, Red 239 and Yellow 176) by two natural mezoporous minerals has been examined in order to identify the ability of these minerals to remove coloured textile dyes from wastewaters.

TL;DR: In this article, the adsorption of methylene blue (MB) from an aqueous solution by polyacrylic acid-bound iron oxide magnetic nanoparticles was studied.

TL;DR: In this paper, an electrochemical oxidation of acid orange 7 (AO7) was performed on a boron doped diamond electrode (BDD) for bulk electrolysis using two different supporting electrolytes (KCl and Na 2 SO 4 ).

TL;DR: The degradation of Disperse Red 354 azo dye in water was investigated in laboratory-scale experiments, using four advanced oxidation processes (AOPs): ozonation, Fenton, UV/H2O2, and photo-Fenton as discussed by the authors.

TL;DR: In this paper, the effect of presence of inorganic salts namely, sodium chloride and sodium sulphate and their concentration on decolouration of acid dye effluents by ozonation was examined.

TL;DR: The results illustrate that the dye additives/impurities in commercial dyes affect the microbial activity as well as the biodegradability and it is recommended that dyes should be purified before ozonation, if detailed information on the degradation processes and the resulting oxidation by-products are required.

TL;DR: In this article, central composite design experiment is used to study the effect of ozone treatment for acid dye effluents and to optimise the variables such as salt concentration, pH and time, which influence the efficiency of colour and COD removal of dye.

TL;DR: In this paper, an attempt has been made to remove color from wastewater containing congo red (a toxic cationic dye) by surfactant mediated cloud point extraction (CPE) in batch mode using Triton X-100 (TX-100) as non-ionic surfactants.

TL;DR: In this paper, six new organic pigments were synthesized and evaluated as the active medium of the solid-state dye laser, and the issues evaluated were: (1) whether the pigments can oscillate as laser medium or not; and (2) degradation by exposure to UV light.

TL;DR: In this article, the application of electrochemical reduction of several vat dyes and even mixtures of them on a fixed bed cathode consisting of graphite granules has been investigated by spectrophotometric experiments in a laboratory scale pilot plant.

TL;DR: In this paper, a series of hetaryl-2-aminothiophenes derivatives with diazotized 4-nitro-aniline, 5-nitrogen-2 -aminothiazole and 6-nitronobenzothiazoles components were synthesized by coupling reaction of 4-aryl 2 -amphosphorus derivatives.

TL;DR: The synthesis of 2-amino-4-(p-substituted)phenyl-thiazole derivatives has been carried out by treatment of substituted acetophenones with thiourea and iodide as catalyst as mentioned in this paper.

TL;DR: In this paper, the anionic agent was found to be covalently bonded to the cellulosic substrates by virtue of the covalent nature of its attachment to the fibers and also gave anionic sites to the substrate for electrostatic interaction with cationic Berberine.

TL;DR: In this paper, aryl amines were coupled with 2-aminothiazoles to give the corresponding thiazolylazo dyes, which were applied to polyester fabric as disperse dyes and their fastness properties were evaluated.

TL;DR: In this article, the anatase-rutile transition is inhibited at low dopant levels with respect to undoped titania powders and the effect becomes less pronounced as iron loading is increased.

TL;DR: In this paper, the effect of poly(ethyleneimine) (PEI) on the adsorption and desorption of lac dye (Natural dye 25; CI 75450) on cotton fibres is reported.

TL;DR: In this paper, experiments were performed on modification of the rutile titanium dioxide surface using 3-aminopropyltriethoxysilane and N-2-(aminoethyl)-3aminopropyltrimethoxyselane in various solvents.

TL;DR: In this article, the synthesis of an alkoxysilane dye (ICTES-DR1) which was copolymerized by sol-gel processing to yield organic-inorganic hybrid materials for use as second-order nonlinear optical (NLO) effect was described.

TL;DR: The method of continuous variations was used to investigate the interactions of anionic dyes with cationic surfactants in aqueous submicellar solutions.

TL;DR: The production of reactive radical species upon irradiation (λ > 300 nm) of six triarylmethane dyes, i.e. C.I. Basic Green 4 (42000; Malachite Green Oxalate), C.

TL;DR: In this paper, Dinuclear dimeric complexes are characterized, in which each metal ion center is wrapped by two dipyrrin units from two distinct ligands and adopts tetra-coordination with distorted tetrahedron geometry.

TL;DR: In this paper, a reverse micellar system was used for dyeing of wool fabrics with conventional acid dyes in a supercritical CO 2, and it was found that the dyeability of the acid dye on wool in this system took no influence of the density of CO 2.