Brilliant green

About: Brilliant green is a research topic. Over the lifetime, 627 publications have been published within this topic receiving 12495 citations.

Determination of equilibrium, kinetic and thermodynamic parameters for the adsorption of Brilliant Green dye from aqueous solutions onto eggshell powder

Abstract: The removal of the Brilliant Green (BG) dye using hen eggshell powder (abundantly available and a total waste material) has been explored. Adsorption studies for the dye removal by eggshell powder has been carried out under varying experimental conditions of adsorbent dose, temperature, contact time, initial dye concentration and pH. The equilibrium data has been studied using the Langmuir isotherm equation. Monolayer adsorption capacity of hen eggshell powder for BG dye is found to be 44.7 mg/g, 34.23 mg/g and 30.23 mg/g at temperatures 303, 313 and 323 K respectively. The kinetic study on BG suggests that the adsorption follows the pseudo-second order kinetics. Adsorption follows both surface adsorption and intra-particle diffusion mechanisms. The Arrhenius energy of activation observed from the experimental data is found to be -15.88 kJ/mol which suggests that the energy barriers are absent in the adsorption process and the reaction is exothermic. The thermodynamic study on BG reveals that the reaction is spontaneous, exothermic and proceeds with decreased randomness at the solid-solution interface as the entropy change (-19.08 J/mol/K) is negative.

Removal of brilliant green dye from synthetic wastewater under batch mode using chemically activated date pit carbon

Abstract: In this research, a single-stage batch adsorber was designed for removal of brilliant green dye (BG) from aqueous solutions using activated carbon derived from date pits (ADPC) based on the Freundlich isotherm which was the best-fitted isotherm model. Experimental work was carried out within the range of 10–50 ppm initial dye concentration to determine the optimum operating conditions which were 55 min contact time, 0.06 g adsorbent mass, 25 °C, and pH = 8. Process kinetics was best-fitted with the pseudo-second order model, which revealed that the intra-particle diffusion stage is the rate-controlling stage for the process. The process efficiency was assessed by infrared spectroscopy (FTIR), scanning microscopy (SEM), X-ray spectroscopy (EDXS), and Brunauer–Emmett–Teller (BET) where the latter showed that the specific surface area of the adsorbent is 311.38 m2 g−1, which gives a favorable maximum monolayer adsorption capacity (77.8 mg g−1). The thermodynamic study proved that BG adsorption on ADPC was physiosorptive (ΔG = −5.86 kJ mol−1) and spontaneous at low temperature (ΔH = −17.7 kJ mol−1, ΔS = −0.04 kJ mol−1 K−1).

Adsorption of Eosin Y, methyl orange and brilliant green from aqueous solution using ferroferric oxide/polypyrrole magnetic composite

Abstract: Ferroferric oxide/polypyrrole (Fe3O4/PPy) composites were prepared by an in situ polymerization method. Several analysis techniques including X-ray diffraction, Fourier transform infrared spectra, thermogravimetric analysis and scanning electron microscopy are applied to analyze the structure and morphology of Fe3O4/PPy. The magnetic Fe3O4/PPy was further used as an adsorbent for removing Eosin Y, methyl orange and brilliant green from aqueous phase. The adsorption kinetics were investigated by pseudo-first-order, pseudo-second-order and intraparticle diffusion models, and the experimental data were well fitted to the pseudo-second order. The equilibrium adsorption data can be described by both the Langmuir and Freundlich isotherm models. The calculated Langmuir maximum adsorption capacities of Eosin Y, methyl orange and brilliant green at 25 °C are 212.31, 149.48 and 263.85 mg/g, respectively. Thermodynamic studies indicated that the adsorption process occurred spontaneously, in an endothermic and physisorption nature, and with increased disorder. Furthermore, the convenient magnetic separability of Fe3O4/PPy makes it a good candidate for practical application in the removal of organic dyes from polluted water.

Evaluation of different plating media used in the isolation of salmonellas from environmental samples.

Abstract: Different serotypes of salmonellas were compared for selectivity and efficiency of recovery using 11 plating media. No optimal growth was obtained after 24 h incubation in any of the media, but after 48 h, brilliant green, brilliant green-phenol red-lactose-sucrose, bismuth sulphite, xylose-lysine-deoxycholate and Hektoen enteric agars showed optimal recovery of all the salmonella serotypes. Xylose-lysine-deoxycholate and brilliant green-phenol red-lactose-sucrose agars were the most selective media for all salmonella serotypes. Addition of 10 micrograms/ml of sodium novobiocin to the tryptic soy-xylose-lysine and tryptic soy-brilliant green agars significantly improved their selectivity but reduced or inhibited the growth of some salmonella serotypes, including Salmonella typhi. Xylose-lysine-deoxycholate agar gave the highest recovery percentage of stressed salmonellas with a double-agar layer technique. Good recovery was also obtained on brilliant green-phenol red-lactose-sucrose, tryptic soy-brilliant green, tryptic soy-brilliant green-novobiocin, tryptic, soy-xylose-lysine and tryptic soy-xylose-lysine-novobiocin agars. Salmonella-shigella agar was the least efficient medium for the recovery of salmonellas under stress-induced or non-stressed conditions.