Adsorptive Removal of Basic Violet Dye from Aqueous Solution by Activated Carbon Prepared From Tea Dust Material (original) (raw)
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Valuation of Activated Carbon from Waste Tea for the Removal of a Basic Dye from Aqueous Solution
The equilibrium and kinetics for the adsorption of methylene blue (MB) dye onto waste tea activated carbon (WTAC) was studied. WTAC was prepared by impregnating the dried waste tea with phosphoric acid followed by carbonization and activation at 800 °C. The results showed that the MB removal increased as the initial MB concentration, contact time and solution temperature increased. The equilibrium data were analysed using the Langmuir, Freundlich, and Temkin isotherms whereas the kinetic data were analysed using pseudo-first-order and pseudo-second-order models. This adsorption was best-fitted with Langmuir isotherm, giving maximum adsorption capacity of 114.943 mg g-1 at 30 °C and it followed the pseudo-second-order model. The presence of intraparticle diffusion with some other rate controlling steps were suggested as the adsorption mechanism with the process being spontaneous and endothermic based on the thermodynamic studies. The activated carbon produced showed some potential in MB removal.
In this study, adsorption equilibrium and kinetic studies for the removal of crystal violet (CV) from an aqueous solution were investigated using a batch adsorption process. The activated carbon was prepared by carbonizing the avocado pear seed at a carbonization temperature of 500 O C for 1hr and was impregnated with a 30% concentration of aqueous HCl solution which was further activated in a muffle furnace at a temperature of 500 O C for 1hr. The avocado pear seed activated Carbon obtained was characterized using proximate analysis, Fourier Transform Infra-Red Spectrophotometer (FT-IR) analysis and Scanning Electron Microscope (SEM) analysis. The effect of various adsorption parameters such as contact time (15-150 min), initial dye concentration (25-150 mg/L), adsorbent dosage (1-9 g), particle size and pH of dye solution were investigated. The adsorption equilibrium data were fitted into different isotherm models and the Langmuir model exhibited the best fit which implied that the adsorption of CV dyes onto avocado pear seed activated carbon was monolayer and the adsorbent surface was homogeneous and also; adsorption energy was uniform for all sites and there was no transmigration of adsorbate in the plane of the surface. The kinetic studies revealed that the adsorption data fitted well to the pseudo-second-order model with a high correlation coefficient of 0.977 when compared to other models, thus; signifying that the adsorption's mechanism was chemisorption. APSAC shows a much better adsorption capacity for CV dye removal having a maximum adsorption capacity of 3.3254 mg/g and percentage removal of 99.995 %. Hence, APSAC can be used as an effective and low-cost adsorbent for the removal of CV dye from an aqueous solution.
2021
One of the most pollutants of water is organic dyes, which is usually come from industries of textile, leather and paper. In this work, activated carbon is used as adsorbent, which is prepared from the corn-cob (CCAC) to remove the methyl violet (MV) dye from prepared aqueous solutions. The amount of adsorption dyes were investigated by including the effect of different parameters such as, the agented time, initial dye MV concentration (10-50 g.L), effect of pH (3,6,8,10 and 12), temperature (288,308,328) K and adsorbent dosage (0.01-0.1g). The percentage of removal of MV by the CCAC is increased significantly with increasing the amount of the adsorbent and the solution pH, and the maximum was at pH 11.5, but its decreased with increasing the temperature and initial concentration of the dye. The two adsorption isotherm models (Langmuir and Freundlich) were used to investigate the interaction between the dye and prepared activated carbon, while the adsorption equilibrium data were be...
Environmental Nanotechnology, Monitoring & Management, 2020
Three different types of activated carbon were synthesized from tea-waste by chemical activation method using three activating agents-H 3 PO 4 (H-AC), KOH (K-AC) and ZnCl 2 (Z-AC) for analyzing the influence of activating agents on the physicochemical and adsorptive properties of materials. Energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectrometer (FT-IR), field emission scanning electron microscopy (FESEM), Xray diffractometer (XRD), thermogravimetric analyzer (TGA), N 2 gas adsorption-desorption analyzer, and point of zero charge (pH PZC) were employed for the characterization of the synthesized materials. Adsorption capacity of H-AC was found to be higher than those of K-AC and Z-AC, and methylene blue (MB) removal efficiency of H-AC was around 98 % for the adsorbent dose of 0.15 g/L. The greater MB removal capacity of H-AC might be due its higher surface area and micropore volume than those of K-AC and Z-AC. The experimental data of batch equilibrium studies for H-AC and Z-AC fitted well with Freundlich isotherm model whereas MB sorption onto K-AC followed Langmuir isotherm. The adsorption kinetic data for all adsorbents followed pseudo-second order model. Intraparticle diffusion model indicated the influence of both external surface adsorption and intraparticle diffusion on adsorption mechanism.
Waste tea activated carbon (WTAC) was prepared through chemical activation with a novel activating agent, potassium acetate and used for the sorption of Acid Blue 25 (AB25) dye. Batch adsorption studies were carried out with the consideration of factors such as initial dye concentration (50–350 mg/L), temperature (30, 40, 50 °C), contact time and initial pH (2–12). This was done to enable the determination of kinetics and isotherms behaviour. Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (D–R) isotherm models were tested and the adsorption of AB25 dye on WTAC was best fitted to Langmuir and the maximum monolayer of WTAC was 203.34 mg/g. Pseudo-second order kinetic model was found to adequately describe the adsorption process. The adsorbent, WTAC gave 97.88% adsorption of AB25 dye.
Removal of Crystal Violet from Wastewater by Activated Carbons Prepared from Rice Husk
Industrial & Engineering Chemistry Research, 2006
Adsorption onto activated carbons is a potent method for the treatment of dye-bearing effluents because it offers various advantages. In this study, activated carbons, prepared by a new technique from low-cost rice husk by sulfuric acid and zinc chloride activation, were used as the adsorbent for the removal of crystal violet, a basic dye, from aqueous solutions. The effects of various experimental parameters, such as adsorbent dosage and size, initial dye concentration, pH, contact time, and temperature, were investigated in batch mode. The kinetic data were well fitted to the Lagergren, pseudo-second-order, and intraparticle diffusion models. It was found that intraparticle diffusion plays a significant role in the adsorption mechanism. The isothermal data could be well described by the Langmuir and Freundlich equations. The maximum uptakes of crystal violet by sulfuric acid activated (RHS) and zinc chloride activated (RHZ) rice husk carbon were found to be 64.875 and 61.575 mg/g of adsorbent, respectively. The results indicate that RHS and RHZ could be employed as low-cost alternatives to commercial activated carbon in wastewater treatment for the removal of basic dyes.
Tea dust as a potential low-cost adsorbent for the removal of crystal violet from aqueous solution
Desalination and Water Treatment
The present work demonstrates tea dust (TD) as a potential low-cost adsorbent for the removal of crystal violet (CV) from aqueous solution by batch adsorption technique. Reaction kinetics and isotherm studies were carried out under various conditions of initial dye concentration, contact time, adsorbent dosage, and pH. The adsorbent was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR) and Brunauer–Emmett–Teller. FTIR results showed complexation and ion exchange appeared to be the principle mechanism for CV adsorption. The adsorption isotherm data were fitted to Langmuir and Freundlich equations; and the maximum adsorption capacity was found to be 175.4 mg/g. The removal of CV by TD followed the unified approach model. Therefore, TD can be employed as an efficient and cost-effective adsorbent in industrial wastewater treatment for the removal of basic dyes.
Removal of Textile dye by Using Activated Carbon in Aqueous Solution
2020
Two textile dye (indigo carmine and acid blue 25) were removed using activated carbon (AC) as solid adsorbent. Effects of various parameters such as adsorbent dosage, contact time, kinetics and thermodynamic properties were investigated by batch adsorption technique. The results shown that the adsorption kinetics of textile dye was determined by the pseudo-second order model and adsorption isotherms fitted very well with Langmuir model. In addition, thermodynamic properties indicated that the adsorption of both textile dye on AC were endothermic and spontaneous process. The maximum adsorption capacities (qm) of indigo carmine and acid blue 25 onto AC was 89.29-104.17 mg/g and 1,428.00-2,000.00 mg/g, respectively. This results could be explained by stronger interaction between acid blue 25 and AC. This work indicated that AC can be used as an alternative adsorbent for removal of textile dye especially acid blue 25, due to the low cost and high efficiency of adsorption capacity. Keywo...
Indian Journal of Chemical Technology, 2008
Batch experiments were carried out for the sorption of Congo red (CR), Malachite green (MG), Rhodamine B (RDB) and Rose Bengal (RB) dyes onto acid activated carbon prepared from a plant material, Aloe barbadensis Mill. The operating variables studied were initial dye concentration, pH, temperature and contact time. Equilibrium data were fitted to the Langmuir and Freundlich isotherm equations. From this, adsorption efficiency, adsorption energy, adsorption capacity, intensity of adsorption and dimensionless separation factor were calculated. The amounts of CR, MG, RDB and RB removed from a 60 mg L -1 of the dye solution at 30°C are 21.17, 26.19, 8.50 and 3.62 mg g -1 , respectively. The results of these studies indicate that the adsorption is favourable. From the kinetic studies, the rate constant values for the adsorption process were calculated. The thermodynamic parameters like AG°, ΔH°, and ΔS° indicate that the adsorption process is endothermic and spontaneous in nature. The me...
Adsorption of cationic dye from aqueous solutions by activated carbon
Microporous and Mesoporous Materials, 2008
In the study, montmorillonite was used as an adsorbent for the removal of methylene blue (MB) from aqueous solutions. Batch studies were performed to address various experimental parameters like contact time, pH, temperature, stirring speed, ionic strength, adsorbent dosage and initial concentration for the removal of this dye. Adsorption rate increased with the increase in initial dye concentration, ionic strength, stirring speed, pH and temperature. Kinetic study showed that the adsorption of dye on montmorillonite was a gradual process. Quasi-equilibrium reached in 3 h. Pseudo-first-order, pseudo-second-order, Elovich, Bangham, mass transfer and intra-particle particle diffusion models were used to fit the experimental data. Pseudo-second-order rate equation was able to provide realistic description of adsorption kinetics. Intra-particle diffusion process was identified as the main mechanism controlling the rate of the dye sorption. The diffusion coefficient, D, was found to increase when the stirring speed, ionic strength and temperature were raised. Thermodynamic activation parameters such as ∆G * , ∆S * and ∆H * were also calculated.