Showing papers on "Brilliant green published in 2020"

Enhanced photocatalytic degradation of cationic dyes under visible light irradiation by CuWO4-RGO nanocomposite

Abstract: The cationic dyes for instance, brilliant green (BG) and malachite green (MG), are well considered compounds for having harmful effects on humanoid life. Thus, it is very noteworthy to monitor and eradicate those dyes from contaminated water. This manuscript has discussed the preparation of CuWO4-RGO nanocomposites by hydrothermal route under solvent and oxidant-free conditions. As prepared products were characterised by X-ray diffraction pattern, scanning electron microscopy, energy dispersive X-ray and Fourier transform infrared spectroscopy. The photocatalytic behaviour of hydrothermally synthesised CuWO4-RGO nanocomposites was studied using the degradation of model dye hazards such as BG and MG under the visible light irradiation. The obtained results showed that prepared nanocomposites exhibited great photocatalytic performance; among all, the CWR-10% composite was recorded with the highest efficiency for decolourisation of MG (93%) and BG (97%) dye solutions in 1 h without oxidising agents added.

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.

Reusability of brilliant green dye contaminated wastewater using corncob biochar and Brevibacillus parabrevis: hybrid treatment and kinetic studies.

Abstract: This work highlights the potential of corncob biochar (CCBC) and Brevibacillus parabrevis for the decolorization of brilliant green (BG) dye from synthetically prepared contaminated wastewater. The...

Photocatalytic degradation of aniline blue, brilliant green and direct red 80 using NiO/CuO, CuO/ZnO and ZnO/NiO nanocomposites

Abstract: Photocatalytic degradation of three dyes, aniline blue (AB), brilliant green (BG) and direct red 80 (DR 80) by transition metal oxide nanocomposites having p-p isotype heterojunction, NiO/CuO and p-n type heterojunction, CuO/ZnO and ZnO/NiO has been explored under sun light and UV light. The effect of reaction conditions such as initial dye concentration, catalyst dosage, pH, contact time and presence of electron acceptor on photocatalytic degradation of these dyes was investigated. A suitable mechanism has been proposed for the photocatalytic degradation of dyes by the nanocomposites with illustration. The results show that NiO/CuO has higher degradation ability on AB dye (91 %) than BG (82 %) and DR 80 dyes (67 %). Among the three nanocomposites, the enhanced degradation ability shown by NiO/CuO are due to its lowest particle size, reduced electron/hole pair recombination, high BET surface area and increased OH radical generation during the photocatalytic reaction. The percentage degradation of all the dyes was carried out under sun light and UV light. It has been found that the rate of dye degradation under sun light is slightly higher than in UV light due to the existence of all type of radiations in sun light.

Brilliant Green Dye Biosorption Using Activated Carbon Derived from Guava Tree Wood

Abstract: The removal of brilliant green (BG) dye from an aqueous solution using activated carbon (AC) derived from guava tree wood is conducted in batch conditions. The influence of different factors such as contact time, pH, adsorbent dosage, initial dye concentration, and temperature on the adsorption of BG onto AC was investigated. FTIR, BET, and SEM analyses were performed to determine the characteristics of the material. The isotherm results were analyzed using the Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich isotherms. Linear regression was used to fit the experimental data. It was found that the equilibrium data are best represented by the Freundlich isotherm, and the adsorption capacity (qe) was 90 mg dye/g AC. The values of the free energy (∆G), enthalpy (∆H), and entropy (∆S) were −86.188 kJ/mol, 43.025 kJ/mol, and 128 J/mol.K, respectively, at pH 7 for the BG dye. The kinetics of BG dye adsorption were analyzed using pseudo-first-order and pseudo-second-order models, and it was found that the pseudo-second-order model was suitable for the behavior of the BG dye at R2 = 0.999.

Comparative study on the adsorption, kinetics, and thermodynamics of the photocatalytic degradation of six different synthetic dyes on TiO 2 nanoparticles

Abstract: Organic effluents have become a serious global environmental concern. Therefore, the removal of pollutive compounds from water systems is essential, and one of potential methods is photocatalysis, employing metal oxides as catalyst. The present study, for the first time, compared the photocatalytic degradation of six different synthetic dyes, including methylene blue (MB), rhodamine B (RhB), crystal violet (CV), methyl violet (MV), malachite green (MG), and brilliant green (BG) as models of organic effluents in aqueous solutions, on anatase titanium dioxide (TiO2) nanoparticles under UV light illumination. The results show the complete degradation of the dyes within 30 min of irradiation. The effects of initial concentration, catalyst dosage, and medium temperature on the photocatalytic degradation of the dyes suggested that the six different dyes in this study were adsorbed in the same way and undergo an oxidation reaction with photo-generated OH· radical on the surface of TiO2 catalyst. The photo-induced degradation of all the dyes follows pseudo first-order kinetics, which can be explained using the Langmuir–Hinshelwood model. The photocatalytic degradation of the dyes was found to be a diffusion-controlled reaction, and its degradation rate was enhanced at higher temperature. Interesting finding is that, under the same experimental conditions, the photodegradation rate was estimated to be 0.77, 0.71, 0.44, 0.30, 0.23, and 0.15 min−1 for CV, BG, MB, MV, MG, and RhB, respectively, suggesting the different potential barriers of demethylation or deethylation reaction of the dyes, which is related to their molecular structure, size, and reactivity. From thermodynamic viewpoint, the activation energy attributed to the potential barrier of the photocatalytic degradation is related to diffusion-controlled reaction between the dyes and generated hydroxyl radical on the TiO2 catalyst surface.

Simultaneous adsorption of a ternary mixture of brilliant green, rhodamine B and methyl orange as artificial wastewater onto biochar from cocoa pod husk waste. Quantification of dyes using the derivative spectrophotometry method

Abstract: Aiming to mitigate disposal and water pollution problems, biochars were prepared from cocoa pod husk (CPH) waste for application in artificial wastewater simulating real conditions of textile effluents. Therefore, the morphological properties of biochars obtained via one/two step NaOH activation were compared and characterized by XRD, Raman spectroscopy, FESEM/EDS and the BET technique. According to these results, biochar obtained from the one-step method (AQ1) was chemically characterized by Boehm titration as well as the point of zero charge and used for the removal of a mixture of brilliant green (BG), rhodamine B (RB) and methyl orange (MO) as artificial wastewater. To evaluate the remaining concentration of each dye after adsorption without previous separation, a derivative spectrophotometry method was applied because some overlap will occur. In order to overcome this problem, adequate wavelengths for each dye in the mixture were established: BG = 631, RB = 592 and MO = 377 nm. Additionally, optimum conditions were determined such as pH 6 and a dosage of 50 mg and the effect of the initial dye concentration was studied in the range of 5–20 mg L−1. The adsorption rate of the ternary dye mixture was fitted to the pseudo second-order model and the affinity of AQ1 towards each dye was in the following order: BG > RB > MO. Furthermore, the adsorption isotherm data were described by multi-component Langmuir and Freundlich models. Finally, the presence of sodium chloride was explored and the synergetic effect in the removal of BG and MO was demonstrated, whereas the adsorption of RB was not promoted under the influence of this salt widely used in the textile industry.

Modified Clays as an Efficient Adsorbentfor Brilliant Green, Ethyl Violet and Allura RedDyes: Kinetic and Thermodynamic Studies

Abstract: Clay minerals can effectively adsorb contaminants from aqueous effluents due to their good adsorption and high cation exchange capacity. However, naturally occurring clay materials possessing hydrophilic features are not especially effective for the removal of organic pollutants. Therefore, in the present work the issue of hydrophilicity is tackled by modification of the clay (Pakistan origin) to prepare organoclays. Hexadecylpyridinium chloride, cetyltrimethylammonium bromide, and sodium dodecyl sulfate were used as clay modifiers. Changes in the basal spacing of clay layers after modification with surfactants were determined through XRD analysis. Chemical compositions of the clay and organoclays were determined by FTIR spectroscopy. Surface morphology of the as-prepared organoclays was assessed from SEM analysis. The modified clays (organoclays) were tested for their ability as potential adsorbents for three dyes from water: brilliant green, ethyl violet and allura red. All three modified clays showed high adsorption characteristics by removing (>90 %) of all three dyes with an adsorption capacity ranging from 35 to 85 mg/g. The time-dependent adsorption experiments showed that the rates of adsorption of dyes on organoclays were fast, adsorbing maximum amounts of dyes ranging from 15 to 80 mins of contact time. The adsorption kinetic study revealed that the dye removal process is mainly governed by a pseudo-1st order mechanism. Thus, surfactant-modified clays are an excellent choice as cost-effective and efficient adsorbents for the purification of water from dye contaminants.

Fed-Batch Decolourization of Mixture of Brilliant Green and Evans Blue by Bacteria Species Applied as Pure and Mixed Cultures: Influence of Growth Conditions

Abstract: Synthetic dyes, generally resistant, toxic and carcinogenic presents a substantial risk to the environment and health of human. The present study was aimed to decolourize a dye mixture (Evans blue and brilliant green) by selected bacterial strains cultivated at different growth conditions (e.g. unmodified, correction of pH value and supplementation with nutrients). The bacterial strains used as pure and mixed cultures include facultative anaerobes Aeromonas hydrophila (Abs37), Citrobacter sp. (Cbs50) and obligatory aerobe Pseudomonas putida (Pzr3). The efficiency of removal of all successive doses of dye mixture (4–5 doses, total load 170–200 mg/l) was tested in static conditions in fed-batch bioreactors. The modification of bacteria growth conditions influenced on decolourization efficiency: most advantageous was pH value correction combined with nutrient supplementation then pH correction alone and nutrient supplementation (final removal results 95.6–100%, 92.9–100% and 89.1–97.2%, respectively). The mixed bacterial cultures removed the total load of dyes with higher efficiency than pure strains (final removal 95.2–100% and 84.0–98.2%, respectively). The best results were obtained for the mixture of facultative anaerobe Citrobacter sp. and obligatory aerobe Pseudomonas putida which removed the highest load of dye mixture (200 mg/l introduced at five doses) in the shortest time (288 h), while the others pure and mixed cultures needed 425–529 h for removal four doses of dye mixture (total load 170 mg/l). The zoo- and phytotoxicity decreased after these processes (from V class of toxicity (extremely toxic) even to II class (low toxicity)). The main mechanisms of decolourization was biotransformation/biodegradation, supported by sorption.

Removal of brilliant green (BG) from aqueous solution by using low cost biomass Salix alba leaves (SAL): thermodynamic and kinetic studies

Abstract: The removal of brilliant green dye (BGD) from aqueous solution by using Salix alba leaves (SAL) was carried out via batch studies. The maximum removal efficiency was found to be 95.2% with initial dye concentration 50 mg/L at 0.15 g adsorbent dosage, pH1⁄4 6, and 298 K temperature, and the equilibrium was observed within 31⁄2 hours. The adsorption capacity increased (2.21–15.89 mg/g) from 10 to 50 mg/L of dye concentration. Kinetic and isotherm studies were also carried out. The results showed that pseudo-second order model better describes the adsorption mechanism. The isotherm equilibrium data analysis was carried out by using Freundlich and Langmuir models and the sorption process was observed to conform with the Langmuir isotherm with linear correlation coefficient (R1⁄4 0.99). The thermodynamic properties ΔG , ΔH , and ΔS delineated that BGD adsorption over SAL was feasible, spontaneous, and endothermic between 303 and 323 K temperature. This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC BY 4.0), which permits copying, adaptation and redistribution, provided the original work is properly cited (http://creativecommons.org/licenses/by/4.0/). doi: 10.2166/wrd.2020.054 om http://iwaponline.com/jwrd/article-pdf/10/1/70/671194/jwrd0100070.pdf er 2021 Rashida Fiaz (corresponding author) Muhammad Hafeez Rashid Mahmood Department of Chemistry, University of Azad Jammu and Kashmir, Muzaffarabad, Pakistan E-mail: abrarashida@gmail.com

Removal of brilliant green (BG) by activated carbon derived from medlar nucleus (ACMN) – Kinetic, isotherms and thermodynamic aspects of adsorption:

Abstract: Experimental investigations were undertaken to adsorb Brilliant Green (BG) a toxic dye from aqueous medium using activated carbon derived from the medlar nucleus (ACMN). The adsorption was used to ...

Rational design of visible-light-sensitive Ag-BiVO4 oxides by matching redox potentials of catalyst, dyes, and reactive oxygen species towards more efficient photocatalytic degradation

Abstract: By employing a rational design approach of matching redox potentials of dye, catalysts, and reactive oxygen species (ROS), Ag-BiVO4 photo-catalysts of 2, 5 and 7 wt% Ag were successfully prepared via sol-gel and UV photo-reduction methods. The as-prepared composites over-perform existing counterparts by exhibiting excellent photocatalytic properties towards degradation of cationic methylene blue (MB, 20 min, 90.9 ± 2.4 %), brilliant green (BG, 20 min, 84.0 ± 2.7 %) and rhodamine B (RhB, 120 min, 90.5 ± 3.3 %) as well as anionic acid red 1 (AR, 60 min, 79.0 ± 2.5 %) and methyl orange (MO, 120 min, 64.9 ± 2.0 %) dyes. Furthermore, based on our novel approach of rational design, the degradation of MB dye was ascribed to photoelectrons from n-type BiVO4, while degradation of MO and AR was attributed to photo-holes from p-type Ag2O. Meanwhile, BG and RhB dyes degrade due to photoelectrons and photo-oxidation by ROS, which was confirmed by carrier scavenger experiments. Results indicate that Ag-BiVO4 oxide can be efficiently used for wastewater treatment, solar energy, water splitting, and medicine.

Impact of untreated and Sargassum wightii-treated brilliant green dye exposure on Indian major carp, Labeo rohita Ham.: hematology, biochemistry, enzymology and histopathology.

Abstract: Water pollution due to agricultural and industrial processes may cause adverse biological effects in aquatic organisms such as fishes. The removal of brilliant green (BG) dye from aqueous solution ...

Adsorption studies on brilliant green dye in aqueous solutions using activated carbon derived from guava seeds by chemical activation with phosphoric acid

Abstract: In this research, brilliant green dye (BG) has been removed from synthetic wastewater using activated carbon derived from guava seeds (AGSC) which was collected as a waste product from factories producing juice concentrates. A single-stage batch adsorber was designed for adsorption of BG by AGSC based on some experimental parameters such as contact time (5–40 min), adsorbent mass (0.01–0.08 g), temperature (25°C–95°C), pH (3–10), and initial dye concentration (10–100 ppm). The maximum adsorption capacity of AGSC was found to be 80.5 mg/g using the Langmuir isotherm model which is the best-fitted model for the process. The experimental data were fitted well with the pseudo-second-order kinetic model. The changes in functional groups, surface morphology, and chemical composition of AGSC before and after adsorption were identified by Fourier transform infrared spectroscopy, scanning electron microscope, energy-dispersive X-ray spectroscopy, respectively. The specific surface area of AGSC was measured to be 605.1 m2/g using Brunauer– Emmett–Teller analysis. Pore volume and pore diameter were found to be 0.57 cm3/g and 3.78 nm, respectively. The thermodynamic study proved that adsorption of BG on AGSC was physiosorptive (ΔG = –7.7 kJ/mol) and spontaneous at high temperature (ΔH = 13.4 kJ/mol, ΔS = 0.07 kJ/mol K).

Monodispersed Silica Nanoparticles Incorporated Nanocomposites of Gelatin and Psyllium for Sequestration of Noxious Pollutants

Abstract: In the present study, monodispersed silica nanoparticles (SNPs) were synthesized by sol–gel method. To enhance the properties like surface roughness, surface area, and percentage swelling, the SNPs were incorporated into the hydrogel Gelatin and Psyllium to synthesize a nanocomposite material. The percentage of swelling was optimized by varying different reactions parameters like temperature, pH, backbone ratio, monomer concentration, cross-linker concentration, initiator concentration and amount of solvent. On incorporation of SNPs, the great enhancement in various properties likes surface roughness, and percentage swelling (1656% from 1100%) was observed. As an adsorbent, the synthesized nanocomposite was investigated with a tremendous hike in the dye removal efficiency on the incorporation of SNPs into the hydrogel network. The synthesized nanocomposite was found to remove 2.385 mg g−1 of Brilliant green (BG) in 5 h whereas 1.56 mg g−1 removal of Xylenol orange (XO) within 4 h. The higher values of K2 and closeness of theoretical and experimental adsorption capacity values at all the concentrations in both the dyes confirmed the adsorption kinetics data fitted well with pseudo-second order rate model. The correlation values (0.966 for BG and 0.995 for XO) and favourable RL (0.345 for BG and 0.263 for XO) of the adsorption data suggested better fit for Langmuir adsorption for both the dyes. Further, the negative values of ΔGo and ΔHo confirmed the adsorption of BG and XO dyes on the adsorbent is a feasible reaction. The reusability affinity of the synthesized SNP based nanocomposite up to 4 cycles outshine as a superior adsorbent material for the removal of cationic and anionic dyes from waste water.