Topic
Brilliant green
About: Brilliant green is a(n) research topic. Over the lifetime, 627 publication(s) have been published within this topic receiving 12495 citation(s).
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TL;DR: It was observed that the rate of dye adsorption follows pseudo-second-order model for the dye concentration range studied in the present case and the estimated values of DeltaH0 and DeltaS0 both show the negative sign, which indicate that the Adsorption process is exothermic and the dye molecules are organized on the kaolin surface in less randomly fashion than in solution.
Abstract: Experimental investigations were carried out to adsorb toxic brilliant green dye from aqueous medium using kaolin as an adsorbent. Characterization of kaolin is done by measuring: (i) particle size distribution using particle size analyzer, (ii) BET surface area using BET surface analyzer, and (iii) structural analysis using X-ray diffractometer. The effects of initial dye concentration, contact time, kaolin dose, stirring speed, pH and temperature were studied for the adsorption of brilliant green in batch mode. Adsorption experiments indicate that the extent of adsorption is strongly dependent on pH of solution. Free energy of adsorption (DeltaG0), enthalpy (DeltaH0) and entropy (DeltaS0) changes are calculated to know the nature of adsorption. The calculated values of DeltaG0 at 299K and 323K indicate that the adsorption process is spontaneous. The estimated values of DeltaH0 and DeltaS0 both show the negative sign, which indicate that the adsorption process is exothermic and the dye molecules are organized on the kaolin surface in less randomly fashion than in solution. The adsorption kinetic has been described by first-order, pseudo-second-order and intra-particle-diffusion models. It was observed that the rate of dye adsorption follows pseudo-second-order model for the dye concentration range studied in the present case. Standard adsorption isotherms were used to fit the experimental equilibrium data. It was found that the adsorption of brilliant green on kaolin follows the Langmuir adsorption isotherm.
449 citations
TL;DR: In this article, the effect of initial dye concentration, contact time, adsorbent dose, stirring speed, pH, salt concentration and temperature were studied in batch mode using commercially available kaolin to adsorb two different toxic cationic dyes namely crystal violet and brilliant green from aqueous medium.
Abstract: Experimental investigations were carried out using commercially available kaolin to adsorb two different toxic cationic dyes namely crystal violet and brilliant green from aqueous medium. Kaolin was characterized by performing particle size distribution, BET surface area measurement and XRD analysis. The effects of initial dye concentration, contact time, adsorbent dose, stirring speed, pH, salt concentration and temperature were studied in batch mode. The extent of adsorption was strongly dependent on pH of solution. Free energy of adsorption (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) changes were calculated. Adsorption kinetic was verified by pseudo-first-order, pseudo-second-order and intra-particle-diffusion models. The rate of adsorption of both crystal violet and brilliant green followed the pseudo-second-order model for the dye concentrations studied in the present case. The dye adsorption process was found to be external mass transfer controlled at earlier stage and intra-particle diffusion controlled at later stage. Calculated external mass transfer coefficient showed that crystal violet dye adsorbed faster than brilliant green on kaolin. Adsorption of crystal violet and brilliant green on kaolin followed the Langmuir adsorption isotherm.
354 citations
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.
Abstract: A novel adsorbent was developed from mature leaves of natural Neem trees for removing dyes from water. The adsorbent, in the form of fine powder, was found to be very effective in removing the dye, Brilliant Green, from aqueous solution. The adsorption process was carried out in a batch process with different concentrations of the aqueous dye solution as well as with different adsorbent doses, at a range of pH values and temperature. The suitability of the adsorbent was tested by fitting the adsorption data with Langmuir and Freundlich isotherms and by computing equilibrium thermodynamic and kinetic parameters, the values of which showed the Neem leaf powder as a promising adsorbent for dyes in aqueous solution.
295 citations
TL;DR: In this article, a number of soil and water samples were collected from the vicinity of effluent treatment plant of a textile and dyeing industry and several organisms were screened for their ability to decolorize triphenylmethane group of dyes.
Abstract: A number of soil and water samples were collected from the vicinity of effluent treatment plant of a textile and dyeing industry. Several organisms were screened for their ability to decolorize triphenylmethane group of dyes. A Kurthia sp. was selected on the basis of rapid dye decolorizing activity. Under aerobic conditions, 98% color was removed intracellularly by this strain. A number of triphenylmethane dyes, such as magenta, crystal violet, pararosaniline, brilliant green, malachite green, ethyl violet and textile and dyestuff effluent used in this study. The rates of decolorization of magenta (92%), crystal violet (96%), malachite green (96%), pararosaniline (100%) and brilliant green (100%) were found to be more than that of ethyl violet (8%). After the decolorization of most of the dyes, viable cell concentration of the Kurthia sp. reduced significantly. In the case of ethyl violet, viable cell concentration was almost negligible after decolorization. The extent of decolorization of synthetic effluent (98%) was more in comparison to textile and dye-stuff effluent (56%). After biotransformation, the extent of COD reduction of the cell free extracts of triphenylmethane dyes was higher (more than 88%, except in the case of ethyl violet, 70%) in comparison to textile and dye-stuff effluent.
241 citations
TL;DR: No one isolate proved to be best for all dyes, and some were poor in most tests, but Phanerochaete chrysosporium was among the least effective of the isolates.
Abstract: The ability of seven different isolates of wood-rotting fungi to decolorize a wide range of structurally different synthetic dyes was investigated. All isolates decolorized some dyes, and all dyes were decolorized to some extent. Color removal efficiency varied from 100% to only ca. 50% at most for chrysophenine. Some decolorizations were extremely rapid. Two isolates reduced the A 625 of a solution of brilliant green from 57 to 0.5 in 1 day. No one isolate proved to be best for all dyes, and some were poor in most tests. Phanerochaete chrysosporium was among the least effective of the isolates. The screening system, which was unoptimized, employed mycelial mats pregrown on malt extract medium and supplied with an energy source, glucose, together with the dye.
227 citations