Showing papers on "Brilliant green published in 2016"

Amine modified tannin gel for adsorptive removal of Brilliant Green dye

Abstract: The potentiality of tannin gel (TG) and amine modified tannin gel (ATG) has been found as highly effective, eco-friendly and cheap adsorbents for removal of Brilliant Green (BG) dye. In each case, the most efficient adsorption occured at pH 7 with 88.38% for TG and 94.05% removal for ATG, respectively. The adsorption kinetics for TG was found to follow pseudo-first-order kinetic model along with intraparticle diffusion, and for ATG it was found to follow pseudo-second order kinetic model. The experimental data were found to best fit with langmuir isotherm ( r 2 > 0.99 for both gels) with maximum monolayer adsorption capacity of 8.55 mg/g for TG and 20.41 mg/g for ATG. The negative values of Gibb’s free energy (Δ G °) of both gels indicate the spontaneous nature of the adsorption process.The positive values of Δ H ° with respect to both gels suggest the endothermic adsorption nature along with positive values of entropy changes (Δ S °).

Synthesis and characterization of citric acid grafted MCM-41 and its adsorption of cationic dyes

Abstract: In this study, citric acid (CA) grafted MCM-41 (SCA-MCM-41) was synthesized for improvement of its adsorptive capacity for methylene blue (MB), malachite green (MG) and brilliant green (BG). Characterization of the adsorbent was carried out using scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), elemental analysis (EA), X-ray diffraction analysis (XRD), textural analysis, thermo-gravimetric analysis (TGA), solid state nuclear magnetic resonance analysis (SSNMR) and fourier transform infrared analysis (FTIR). MB, MG and BG adsorption studies were carried out on citric acid modified MCM-41, varying parameters such as initial dye concentration, pH, adsorbent dose, contact time and temperature. The maximum adsorption capacity of the modified material improved considerably for all the dyes with a basic pH and temperature of 25 °C for all the adsorbates. The qm values obtained were 204.08 mg/g, 334 mg/g and 227 mg/g for MB, MG and BG, respectively. Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models were used in analyzing equilibrium data. The adsorption kinetics favoured the pseudo-second-order model. Adsorption of the dyes into SCA-MCM-41 was spontaneous and exothermic.

Adsorption of Brilliant Green Dye on Biochar Prepared From Lignocellulosic Bioethanol Plant Waste

Abstract: This study was aimed at the adsorption of Brilliant Green (BG) on hydrolyzed rice straw biochar, which was obtained from a lignocellulosic bioethanol process. Rice straw biochar (RBC) possessed surface properties such as a Brunauer–Emmett–Teller (BET) surface area of 232.31 m2/g, a total pore volume of 0.30 cm3/g, and an average pore width of 5.22 nm. Adsorption studies were carried out to investigate the effect of experimental factors such as pH (2–10), biochar dose (0.05–1.25 g/L), contact time (30–480 min), and temperature (30 to −50°C) on the adsorption of BG. The Langmuir isotherm (R2 = 0.998) fitted well to the adsorption data for initial dye concentrations of 20–500 mg/L, implying that BG adsorption occurred in the form of a monolayer on RBC. Adsorption kinetics was well fitted by the pseudo-second order kinetic model (R2 ≥ 0.988) for all tested dye concentrations. The thermodynamic study revealed that BG adsorption on RBC was spontaneous, favorable, and a physical process. The maximum adsorption capacity of RBC was found to be 111.11 mg/g. These results showed that RBC, prepared from the waste of the bioethanol process, can be effectively used as a promising cheap adsorbent to remove dyes from aqueous solution. This approach of product diversification (bioethanol along with biochar) may lead to a cost effective and cleaner production of bioethanol.

Studies on pH-dependent color variation and decomposition mechanism of Brilliant Green dye in Fenton reaction

Abstract: Degradation of Brilliant Green (BG) dye has been studied using Fenton reagent in the dark environment. The intensity of dye color was pH dependent with maximum absorbance at pH 6. N-de-alkylation caused dye decomposition which resulted in the reduction of absorbance. The rate of BG dye decolorization increased with an increase in the H2O2 and Fe2+ concentration. The presence of background ions commonly found in an industrial dyeing wastewater suppressed the efficiency of color, COD and TOC removal within 9 %. There was about 2.9-fold increase in biodegradability index after 30 min of reaction. The proposed mechanism showed the routes of dye degradation with low errors (−0.88 to 0.49 g mol−1) with respect to the exact mass. Dye degradation began with N-de-ethylation, and later was further cleaved to aromatic-amine, -acid, -alcohol and -additive products. Hydroquinone was originated by hydroxylation of N,N-diethyl aniline. An equilibrium cycle among quinone, hydroquinone and Fe(III)-hydroquinone was exhibited through the formation of charge transfer complex.

Fabrication of manganese dioxide/carbon/attapulgite composites derived from spent bleaching earth for adsorption of Pb(II) and Brilliant green

Abstract: Manganese dioxide/carbon/attapulgite ternary composites were fabricated via a facile hydrothermal method based on spent bleaching earth. It is worth noting that the residual organic matter of the spent bleaching earth not only served as a low-cost available carbon precursor, but also as a reductant for the formation of manganese dioxide based on the redox with KMnO4. Using the organic dye of Brilliant green and the heavy metal ion of Pb(II) as model pollutants, the effect of the critical factors on the adsorption properties have been systematically investigated, including the sample preparation conditions, contact time and initial concentration of pollutants. The results reveal that the adsorption properties of the as-prepared composites are well dependent on the concentration of KMnO4, and the maximum adsorption capacity toward Brilliant green and Pb(II) can reach 199.99 mg g−1 and 166.64 mg g−1 while the concentration of KMnO4 is 12% and 16%, respectively.

Ethylene glycol mediated synthesis of Ag8SnS6 nanoparticles and their exploitation in the degradation of eosin yellow and brilliant green

Abstract: Ag8SnS6 (silver tin sulfide) nanoparticles (17–18 nm) were synthesized using a chemical coprecipitation method using ethylene glycol as a solvent and capping agent and thiourea as a sulfur source at a temperature of 160 °C, 6 h. The as synthesized nanoparticles were characterized by X-ray diffraction (XRD), and transmission electron microscopy (TEM). The optical properties were investigated by using UV-visible NIR spectroscopy. The XRD pattern shows the formation of single phase Ag8SnS6 with a rhombohedral structure. Ethylene glycol mediated synthesis resulted in the formation of spherical Ag8SnS6 nanoparticles as seen from TEM images. Diffuse reflectance spectra show that Ag8SnS6 possesses an absorption profile across the whole visible-light and near-infrared region. Ag8SnS6 exhibits a band gap energy 1.12 eV. Ag8SnS6 shows powerful visible light photodegradation activity towards the degradation of eosin yellow and brilliant green dyes. The enhanced photocatalytic activity of Ag8SnS6 particles is attributed to its improved visible light absorption and efficient separation of photogenerated charge carriers. Studies with different quenchers suggest that superoxide radicals play a major role in the photodegradation process.

Brilliant green dye added zinc(tris) thiourea sulphate monocrystal growth with enhanced crystalline perfection, optical, photoluminescence and mechanical properties

Abstract: In present work, the pure and brilliant green dye doped single crystals of nonlinear optical zinc tris(thiourea) sulfate have been grown for the first time using slow evaporation solution technique from their aqueous solutions. The powder X-ray diffraction and FT-Raman spectroscopic investigations were carried out to confirm and identify the crystal structure and vibrational modes, respectively. The strong effect of dye on crystals morphology is observed. For optical band gap analysis the diffused reflectance was measured. Two absorption bands were observed in the diffused reflectance spectrum centered at ~425 and 627 nm due to brilliant green dye. Room temperature PL study with 310 nm excitation show noticeable enhancement in UV-blue emission band centered at 348 nm due to dye doping and also the enhancement in violet-blue emission centered at 420 nm was observed. Mechanical strength was also found to be enhanced with doping. All the results show that the properties of ZTS crystals are enriched due to dye doping and can be applied in optoelectronic devices.

Integrating chloroethyl phosphate with biopolymer cellulose and assessing their potential for absorbing brilliant green dye

Abstract: Cellulose is vastly used in the adsorption of dyes. It can be used in its natural formor with modified surface. This present study aimed at integrating phosphate cellulose with chloroethyl phosphate, value their potential as adsorbents of brilliant green dye, and compare suchresults to those of pure cellulose (Pure-Cel). The phosphatic material (Phosp-Cel) was characterized by XRD, where it was found that the crystallinity of the material was kept; by IV, which showedtwo bands in 1059 and 1027 cm −1 that indicated the presence of the C O P link; by 31 P NMR, which showed a broad signal in 1.86 ppm indicating the presence of a single species of phosphorus in material (P O C); and by thermogravimetry, where Phosp-Cel proved to be more thermally stable than cellulose forerunner. A time of 20 and 120 min was obtained to reach the equilibrium, through the tests of adsorption, for Pure-Cel and Phosp-Cel, respectively. In both cases the system follows the pseudo second order model. The largest removal occurred at pH 10 and the maximum adsorption was 46.7, 58.42 and 90.5 mg g −1 for Pure-Cel, and 113.6, 114.2 and 112.1 mg g −1 for Phosp-Cel at 25 °C, 35 °C and 45 °C, respectively. Pure-Cel experimental isotherms were best fit to the Langmuir model, and Phosp-Cel at 25 °C best fit the Langmuir model; while at 35 °C and 45 °C it best fit the Freundlich model.

Optimization of Brilliant Green Dye Removal Efficiency by Electrocoagulation Using Response Surface Methodology

Abstract: The response surface methodology has been used to determine the optimum conditions for the Brilliant Green dye removal efficiency from aqueous solution by electrocoagulation. The experimental parameters which have been investigated were initial dye concentration: 100–500 mg/L; voltage: 4-12V; NaCl Concentration:0.5-1.5g/l and reaction time: 10–30min. These parameters were changed at three levels according to the Box Behnken Design to evaluate their effects on decolorization through analysis of variance. High R2 value of 96.16% shows a high correlation between the experimental and predicted values and expresses that the second-order regression model is acceptable for Brilliant Green dye removal efficiency. Optimum dye removal efficiency of 99.0% was observed experimentally at NaCl concentration of 0.5008g/l, initial dye concentration of 500 mg/L, applied voltage of 4.0065V and reaction time of 12.22 min, which is close to model predicted (98.9997%) result.

Enhanced Removal of Some Cationic Dyes from Environmental SamplesUsing Sulphuric Acid Modified Pistachio Shells Derived Activated Carbon

Abstract: In the present work, pistachio shell, local agriculture waste, has been successfully used for the preparation activated carbon (AC) by sulphuric acid. This sulphuric acid based activated carbon (ACS) was used for the removal of two cationic dyes viz., methylene blue (MB) and Brilliant green (BG) from aqueous solutions. The structure and physical and chemical properties of ACS are investigated using FTIR and SEM analysis and pH surface and Boehm titration. The effect of the differential experimental parameters controlling the adsorption of dyes onto ACS, was thoroughly investigated, such as the effect of pH, initial dye concentration, contact time and adsorbent dosage in batch mode. Employment of equilibrium isotherm models for the description of adsorption capacities of ACS explores the good efficiency of Langmuir model for the best presentation of experimental data with maximum adsorption capacity of 208.333 and 151.515 mg/g for MB and BG dyes. The kinetic data were fitted to the pseudo-secondorder kinetic model with cooperation with interparticle diffusion model. Thermodynamic parameters were evaluated to predict the nature of adsorption. These results point out the endothermic and spontaneous nature of the sorption process. The results demonstrate that ACS is effective in the removal of MB and BG dyes from aqueous solutions and can be used as an alternative to the high-cost commercial adsorbents.

Water purification of dyes by ceramic membrane modified by pyrocarbon from carbonized polymers

Abstract: Modification of membranes by pyrocarbon was carried out by carbonization of polyisocyanate, celluloacetate and Na-salt of carboxylmethyl cellulose at 750°C. The water was purified of dyes by the pressure-driven method under pressure from 0.1 to 1.1 MPa. The retention coefficient and specific capacity of modified membranes for direct scarlet vary respectively from 37 to 99.99% and from 1.8 to 36 dm3/(m2 • h). For membranes with carbonized cellulose ethers the retention rate for brilliant green vary from 19 to 78.5% and the specific capacity depending on pressure and filtration time varies from 8.1 dm3/(m2 • h) to ~ 1 m3/(m2 • h).

Sonochemically Synthesized Beta-Cyclodextrin Functionalized Graphene Oxide and its Efficient Role in Adsorption of Water Soluble Brilliant Green Dye

Abstract: In this short communication, we report a novel and inexpensive approach to synthesize Beta-Cyclodextrin functionalized Graphene Oxide (GOCD) which has been fabricated for the adsorption of water soluble organic dyes from aqueous solution. The adsorbent GOCD has been synthesized using facile sonochemical route and accordingly characterized using techniques such FTIR, TGA, RAMAN and TEM respectively. Brilliant green dye (BG), a cationic, water soluble dye, commonly used as green pigment in textile/dye printing technology, is a highly toxic compound and consequently GOCD has been employed for its removal before recyclability of the waste water. The adsorption study of BG onto GOCD is investigated using UV-vis absorption spectroscopy. The exploration established the fact that the as-synthesized material GOCD has appreciable capability in dye removal and therefore possesses significant roles in waste water treatment technology.

Effective visible light photocatalytic degradation of Brilliant green using H2O2sensitized BiVO4

Abstract: Photocatalytic degradation of Brilliant green is studied over monoclinic BiVO4 in presence of H2O2 under visible light irradiation. Experimental results indicate a synergetic effect between BiVO4 and H2O2 in generating more A‹Â™OH free radicals which are responsible for the degradation of dye molecular structure. Complete degradation was achieved for 90min of irradiation.

Synthesis of Synthesis and Adsorption Study of Manganese Dioxide Nanoparticles

Abstract: In this study deals with the synthesis of manganese dioxide nanoparticles by Hydrothermal and Co-precipitation methods The morphology of MnO 2 nanoparticles were analysed through various instruments like Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM) to get the information related to nanoparticles. The structure of MnO 2 nanoparticle was analysed through Powder X-ray Diffraction (PXRD), Infra Red spectroscopy (IR) and Ultra Violet spectroscopy (UV). Adsorption study of Brilliant Green (BG) and Rhodamine B (RB) was applied and the adsorption behaviour of MnO 2 nanoparticle is compared with ordinary MnO 2 . From the percentage removal of dyes, it was known that the MnO 2 nanoparticles are having high adsorption activity than the ordinary MnO 2 to adsorb Brilliant Green (BG) and Rhodamine B (RB).

Exploration of Plant-Biomass Degrading Fungi for In Vitro Mycoremediation of Toxic Synthetic Dyes

Abstract: ISSN: 2319-7706 Volume 5 Number 5 (2016) pp. 581-592 Journal homepage: http://www.ijcmas.com The use of extracellular enzyme systems from wood decaying fungi are now growing very fast for bioremediation of synthetic and toxic dyes from environment. In view of this, present study was undertaken for decolorization of two synthetic industrial viz. congo red and brilliant green using wood rot fungal cultures. Fifty five wood rotting fungal cultures were tested qualitatively for production of extracellular lignolytic enzymes. Selected cultures were used for testing the in vitro dye removal potential in dye containing broth. Samples were withdrawn periodically and percent decolorization was calculated. The fungal cultures removed the dye from the media either by accumulating it in mycelia (bio-sorption) or by metabolizing it to some non-coloured components. The cultures varied in their dye decolorizing potential, showing 50.21-97.37% decolorization of brilliant green within 24 d. All the selected cultures showed complete bio-sorption of congo red dye within one month. The efficient strains were further selected for the production of various enzymes involved in the dye decolorization and crude enzyme activities in culture supernatantes were calculated. In all the cases, maximum extracellular laccase, lignin peroxidases and Mn dependent peroxidase activities were observed within 15 to 18 d of incubation in culture supernatant. Light microscopy and phase contrast microscopy clearly revealed bio-sorption of the dye by fungal cultures in the photomicrographs. Among various cultures tested, the potential isolate showing maximum dye decolorizing/ bioabsorbing ability identified as Ganoderma sp. K ey wo rd s Plant-Biomass, Mycoremediation, Toxic Synthetic Dyes, Ganoderma sps, congo red and brilliant green. Accepted: 18 April 2016

Effect of temperature on brilliant green adsorption by shrimp shell: equilibrium and kinetics.

Abstract: As the direct discharge of dying wastewater into the environment has adverse effects, there is a growing interest in using low-cost adsorbents or waste materials to adsorb dyes. In this study, the effect of temperature on the equilibrium and kinetic adsorption of brilliant green dye by shrimp shell (Macrobrachium rosenbergii) was studied using a batch process. The factors affecting the adsorption process, including contact time, initial dye concentration, and temperature, were investigated. The equilibrium data were analyzed by Langmuir, Freundlich, Temkin, and Dubinin-Raduskevich isotherm models. The Langmuir isotherm model fit the best, and the maximum adsorption capacity values were 8.13, 9.35, and 10.6 mg/g at 20, 30, and 40°C, respectively. The adsorption kinetic data corresponded to the pseudo-second order model at all temperatures. Thermodynamic parameters, such as ∆G, ∆H, and ∆S were calculated. Negative values of ΔG indicated that the overall adsorption was spontaneous. The characterization of surface adsorbent by FTIR confirmed that the shrimp shell can adsorb brilliant green dye and the proposed adsorption mechanisms were hydrogen bonding and n−π interaction. Experimental results showed that the adsorption capacity increased with temperature and the shrimp shell was an effective adsorbent for removing brilliant green dye.

Method for degrading acid brilliant green through laccase produced from white rot fungi

Abstract: The invention discloses a method for degrading acid brilliant green through laccase produced from white rot fungi. According to the method, brilliant green is treated through a crude enzyme liquid produced through fermentation of panus conchatus, a decoloration experiment of acid brilliant green GS in dye by crude enzyme produced from panus conchatus is designed through SPSS (statistical product and service solution) software, the best decoloration condition of the obtained acid brilliant green GS is analyzed through SPSS and the dye has a reaction. Results show that the decoloration rate of the dye reaches 98% 35 min after the reaction. The method has wide and practical application value.

Degradation of Brilliant Green by Using a bentonite Clay- Based Fe Nano Composite Film as a Heterogeneous Photo- Fenton Catalyst.

Abstract: This paper aims to study the chemical degradation of Brilliant Green in water via photo-Fenton (H2O2/Fe 2+ /UV) and Fenton (H2O2/Fe 2+ ) reaction. FeB nano particles are applied as incrustation in the inner wall surface of reactor. The data form XRay diffraction (XRD) analysis that FeB nanocomposite catalyst consist mainly of SiO2 (quartz) and Fe2O3 (hematite) crystallites. B.G dye degradation is estimated to discover the catalytic action of FeB synthesized surface in the presence of UVC light and hydrogen peroxide. B.G dye solution with 10 ppm primary concentration is reduced by 99.9% under the later parameter 2ml H2O2, pH= 7, temperature =25°C within 10 min. It is clear that pH of the solution affects the photocatalytic degradation of B.G dye. All the conditions above have been studied to reach the optimum operation condition for the two processes Fenton and photoFenton. The B.G degradation process follows firstorder reaction rules. PhotoFenton process causes a more efficient oxidation rate than the Fenton process. So, the photoFenton degradation is an effective and economic process by producing higher percentage of degradation and mineralization in short radiation time.

Studies on dyeing and value-addition of ornamental grass Lagurus ovatus

Abstract: Lagurus ovatus (hare tail grass) is a winter season grass which is utilized in dry flower industry in preparation of various types of value-added products like flower arrangements, hangers, wall pictures etc. Different dyes like Fabric dyes, indicator dyes, food dyes and bio-colours were used for colouring this grass. Findings revealed that among four different categories of dyes fabric dyes i.e. Yellow, Dark green, Violet, Magenta Pink and indicator dyes Brilliant Green, Eosin Yellow and Crystal Violet were the excellent in performance for dyeing of Lagurus ovatus in terms of colour intensity and colour absorption. These dyes scored maximum for quality parameters even after ten months of storage. Quality parameters in case of food dyes were medium to high at the time of dyeing but the colours faded very fast and retention was not good after ten months. Out of the bio-colours; dyeing with turmeric and lilium pollen were quite satisfactory, whereas other colours like henna powder, gulmehndi (wild henna), coffee, butea, punica, beet root were very poor in performance.

Photocatalytic degradation of Brilliant Green, Carmine Indigo and Toluidine Blue using H2O2 sensitized Bi2WO6 and visible light

Abstract: Visible light activated photocatalytic degradations of Brilliant green, Carmine indigo and Toluidine blue dyes have been studied using Bi2WO6 synthesised by solid-state metathesis. Complete degradation of the above dyes is achieved for 240, 135 and 75 min of irradiation respectively. Addition of external oxidant H2O2 enhanced the rate of degradation and formation of A‹Â™OH free radicals during irradiation in presence of H2O2 is established by photoluminescence studies using terpthalic acid as probe molecule.