Preparation of Modified nano-SiO2 by Bismuth and Iron as a novel Remover of Methylene Blue from Water Solution (original) (raw)
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Removing Methylene Blue from Aqueous Solutions Using Rice Husk Silica Adsorbent
Polish Journal of Environmental Studies
The main goal of this study is to investigate the efficiency of the silica derived from the raw rice husk in the removal of methylene blue from aqueous solutions. The effects of initial concentrations of methylene blue, pH, the adsorbent dose, and the contact time on methylene blue removal efficiency were carried out in batch reactors. The silica derived from the raw rice husk was prepared in a furnace at 800°C for 4 hours after acid leaching with sulfuric acid and chloridric acid. The rice husk silica showed more porosity than the raw rice husk with a median pore radius of 2.4 nm and a high specific surface area up to 226.3 m 2 g-1. The maximum removal efficiency of methylene blue by the rice husk silica under the initial concentration of 10 mgL-1 methylene blue, 1 gL-1 adsorbent mass, 60 min contact time, and pH 8 was 96.7%. Correlation coefficients of the adsorption models have shown a better matching of methylene blue adsorption by the rice husk silica with the Langmuir isotherm model. The results of this study show that the rice husk silica can be applied to remove environmental pollutants such as methylene blue due to the low cost and availability of rice husks.
Adsorptive removal of anionic dyes by modified nanoporous silica SBA-3
Applied Surface Science, 2010
Batch sorption experiments were carried out to remove dyes, methyl orange (MO), orange G (OG) and brilliant red X-3B (X-3B), from their aqueous solutions using a mesoporous silica SBA-3 as an adsorbent. The effect of surfactant template in SBA-3 on the removal of OG, MO and X-3B was investigated. Experiments were carried out to investigate the influence of contact time, initial concentration, pH, and adsorbent dosage on the adsorption performance. The adsorption results of anionic dyes on the uncalcined SBA-3 (noted as SBA-3) were compared with those of the calcined SBA-3 (noted as C-SBA-3). The uncalcined SBA-3 adsorbent has a large adsorption capacity and a strong affinity for the anionic dyes. Langmuir, Freundlich and Temkin isotherms were employed to model the experimental results, from which the Freundlich isotherm exhibited the most appropriate to predict the same. Freundlich isotherm exhibited the most appropriate to predict the experimental results. The kinetic data were also analyzed through pseudo-first-order and pseudo-second-order models. The pseudo-second-order kinetic model well depicted the kinetics of dyes adsorption on mesoporous SBA-3.
The effect of temperature using 1% Fe2O3/G-NS on application for methylene blue adsorption
AIP Conference Proceedings
Methylene blue is a dye in the textile industry which is found in large quantities and is harmful to health, so it requires handling through the adsorption process. This research is related to the synthesis of gelatin-modified nanosilica (G-NS) adsorbent impregnated with Fe2O3 1% wt for the preparation of 1% Fe2O3/G-NS by hydrothermal method at 100°C for 24 hours. 1% Fe2O3/G-NS sample was characterized using FTIR and XRD and used in methylene blue adsorption with the specifications of the adsorbent weight of 0.05 grams, contact time of 100 minutes and speed of 150 rpm. The effect of the temperature of the methylene blue adsorption process using 1% Fe2O3/G-NS was observed at 30, 40 and 50°C and the results showed that the higher the temperature, the lower the adsorption capacity due to decreased methylene blue bonds with Si-O-Si and Fe-O groups. The optimal adsorption was carried out 50°C which was in accordance with the pseudo first order adsorption kinetics model with maximum adsorption capacity of 132.4043 mg/g (adsorbent weight 50 mg, initial concentration of 100 ppm, 100 minutes contact with a stirring speed of 150 rpm).
Rasayan Journal of Chemistry, 2021
The textile industry causes water pollution by releasing used wastewater into natural water sources. In the present study, naturally available adsorbent was used to study the efficiency of Methylene Blue (MB) dye removal from wastewater effluents. Three different parameters such as the effect of contact time, effect of temperature and effect of initial dye concentration on Methylene blue dye removal by using the Vigna Trilobata pod adsorbent were examined. From the experimental results it is proved that the dye removal efficiency of naturally available Vigna Trilobata pod is effective and can be alternative to commercially available adsorbents used for removal of Methylene Blue dye from industrial wastewater.
Materials, 2021
Treatment of wastewaters containing hazardous substances such as dyes from the textile, paper, plastic and food industries is of great importance. Efficient technique for the removal of highly toxic organic dyes is adsorption. In this paper, adsorptive properties of the carbon-silica composite (C/SiO2) were evaluated for the cationic dyes C.I. Basic Blue 3 (BB3) and C.I. Basic Yellow 2 (BY2). The sorption capacities were determined as a function of temperature (924.6–1295.9 mg/g for BB3 and 716.3-733.2 mg/g for BY2 at 20–60 °C) using the batch method, and the Langmuir, Freundlich and Temkin isotherm models were applied for the equilibrium data evaluation using linear and non-linear regression. The rate of dye adsorption from the 100 mg/L solution was very fast, after 5 min. of phase contact time 98% of BB3 and 86% of BY2 was removed by C/SiO2. Presence of the anionic (SDS), cationic (CTAB) and non-ionic (Triton X-100) surfactants in the amount of 0.25 g/L caused decrease in BB3 and ...
A comparative study for the removal of methylene blue dye by N and S modified TiO2 adsorbents
Journal of Molecular Liquids, 2015
Successful removal of methylene blue (MB) dye from aqueous solutions using nitrogen and sulfur modified TiO 2 (P25) nanoparticles has been demonstrated in this study. The modified adsorbents were characterized using various analytical methods, such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The adsorption potential of S-TiO 2 , N-TiO 2 and TiO 2 (P25) type adsorbents was tested for the removal of MB dye. The kinetic studies indicated that the adsorption of MB dye followed the pseudo-first order model, while desorption processes followed the second order model. The adsorption capacity of the adsorbent proved to be increasing as a function of initial pH of the solution. The maximum adsorption capacities were found to be 350.66, 410.12 and 282.84 mg/g of S-TiO 2 , N-TiO 2 and TiO 2 (P25), respectively. It can be concluded that modification of TiO 2 (P25) nanoparticles with N and S leads to a higher adsorptive removal of MB.
The Effect of Adsorbent Type and Ratio on Removal and Isotherm Adsorption of Methylene Blue
Jurnal Sains Materi Indonesia, 2020
THE EFFECT OF ADSORBENT TYPE AND RATIO ON REMOVAL AND ISOTHERM ADSORPTION OF METHYLENE BLUE. Methylene Blue (MB) is one of the dye that are widely used in the textile industry. The wastewater from textile industry that contain MB can reduce the oxygen level in water bodies. This study aims to determine the efficiency of the adsorbent in MB removal and to analyze the isotherm adsorption. The variations conducted in this research was the type of adsorbent and its ratio. The activated carbon that used as adsorbent was fresh betel nut (Cyrtostachys lakka) activated carbon (A), regenerated betel nut activated carbon (B), and coconut shell activated carbon (Cocos nucifera) (C). The type of adsorbent was AB, AC, and BC with ratio of 1:1, 1:2, 1:3, 2:1, and 3:1. The MB concentration was analyzed by using UV-Vis spectrophotometer. Isotherm adsorption was calculated based on Freundlich and Langmuir. The best results showed that the combination of fresh and regenerated betel nuts (AB) with rat...
2018
Montmorillonite-silica nanocompsite synthesized from locally available materials obtained from rice husk and montmorillonite clay is used as an adsorbent in the removal of methylene blue dye from aqueous solution. Batch adsorption method was employed in this study where the influential parameters studied were adsorbent dose, initial concentration and contact time at the optimum conditions; 0.5g, 3 mg and 20 minutes respectively at room temperature. The maximum percentage removal obtained from the adsorption processes was 99.30%. The isotherms results obtained for Langmuir isotherm was R 2 = 0.7656 and Freudlich; R 2 = 0.1568. From the above, it is obvious and certain that the Langmuir isotherm best fit the adsorption process carried out in this study. The RL =0.982 indicates that the adsorption process was favourable since the value is close to one and the maximum adsorption capacity obtained was found to be qmax = 58.82 using the Langmuir isotherm. The kinetic study was employed us...
Scientific Reports
In this study, the potential of a new low-cost adsorbent, Syringa vulgaris leaves powder, for methylene blue adsorption from aqueous solution was investigated. The adsorbent surface was examined using SEM and FTIR techniques. The experiments were conducted, in batch system, to find out the effect of pH, contact time, adsorbent dose, initial dye concentration, temperature and ionic strength on dye adsorption. The process is best described by Langmuir isotherm and the pseudo second order kinetic model. Maximum adsorption capacity, 188.2 (mg g−1), is better than other similar adsorbent materials. Thermodynamic parameters revealed a spontaneous and endothermic process, suggesting a physisorption mechanism. A Taguchi orthogonal array (L27) experimental design was used to determine the optimum conditions for the removal of dye. Various desorbing agents were used to investigate the regeneration possibility of used adsorbent. Results suggest that the adsorbent material is very effective for...
2023
Synthetic dyes were considered harmful due to their toxic, carcinogenic, and nonbiodegradable chemicals. Anionic (congo red (CR) and methyl orange (MO)) and cationic (methylene blue (MB) and Janus green B (JGB)) dyes are used in this study due to their ability to restrict oxygen and sunlight dispersion. The discharge of dyes can degrade aquatic systems. This study has investigated the potential of dyes' adsorption behaviour in silica nanocapsules (SiNCs) adsorbents. Silica nanocapsules (SiNCs) were synthesized using oil-in-water (o/w) emulsion by employing different solvents (ethanol (SiNC E), ethyl ether (SiNC EE), and toluene (SiNC T) to understand the effect of solvents on SINCs' structure and effective dye adsorption. Which found that toluene and ethyl ether were effective solvents to produce silica nanocapsules. SiNC T and SiNC EE were both hollow cores, while the SiNC E structure was spherical. SiNC T adsorbent had high selectivity removal of CR > MO and JGB > MB, in which the adsorption capacity was 0.102 mmol/g at pH 2, 0.029 mmol/g at pH 2, 0.0999 mmol/g at pH 10, and 0.0944 mmol/g at pH 12 for 24 h for CR, MO, JGB, and MB, respectively. The kinetic study shows that the adsorption of dyes follows pseudo-second-order. The experimental data followed the Langmuir isotherm model and gave maximum adsorption capacities of 0.0979 and 0.4147 mmol/g for CR and JGB, respectively. SiNC T was recycled and reused for six consecutive cycles. Developed adsorbents are low-cost, highly efficient, and viable materials to be used in wastewater treatment.