Efficient Removal of Acid Orange 7 Dye from Aqueous Solution Using the Exchange Resin Amberlite FPA-98 as an Efficient Adsorbent: Kinetics, Equilibrium and Thermodynamics Study
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Amberlite
Ion-exchange resin
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In the present study, batch experiments were performed to remove chromium (VI) from aqueous solutions using an anion exchange resin. In order to investigate the kinetic mechanism which controls the chromium (VI) adsorption, four kinetic models were used: pseudo-first order, pseudo-second order, the Elovich equation and the intraparticle diffusion model. In reaction with 1,5 diphenylcarbazide, chromium (VI) forms a complex, which was analyzed at 540 nm using a spectrophotometer after 7 min. The Cr (VI) adsorption process was well described by the pseudo-second order kinetic model for 0.1 to 0.3 g/L Cr (VI).
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Oxyanion
Amberlite
Chromate conversion coating
Orange G
Methyl orange
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In the present study, aluminum-modified anionic exchanger nanoparticles were synthesized by introducing Al(III) ions onto the functional sites of the polymeric anion exchanger Amberlite-402.The modified anionic exchanger gathered the favorable sorption properties of inorganic nanoparticles with the excellent hydraulic characteristics of polymeric beads.Hazardous persistent fluoride ions in water were removed by the new sorbent using both batch and fixed-bed column techniques.Different parameters that affect the adsorption process such as initial concentration, pH, and temperature have been investigated.It is found that the adsorption of fluoride ions is efficient in a wide range of pH.However, maximum removal is observed at pH = 3.0.In addition, the adsorption capacity is slightly affected by temperature and is increased by decreasing the temperature from 308 to 288 K to reach 80.33 mg g -1 .The coexisting ions chloride and nitrate were also studied.Their existence had a significant effect on reducing the efficiency of fluoride removal from 24.5 to 17.5 mg g -1 and 15.0 mg g -1 , respectively.The study showed that the adsorption process favored the Langmuir adsorption model.Thermodynamic parameters were also calculated and positive DG° values were related to a nonspontaneous nature of the adsorption.Fixed-bed column experiments were carried out for investigating the following parameters: influent fluoride concentrations, bed depths, and various flow rates.The breakthrough time increased either with increasing flow rate, decreasing bed depth, or decreasing influent fluoride concentration.The X-ray diffraction, energy dispersive X-ray spectroscopy, and scanning electron microscope studies were carried out for the characterization of the new sorbent.These studies confirmed that aluminum ions are successfully loaded onto the surface of Amberlite-402.This study proves that novel Amberlite-IRA-Al is more efficient than other defluoridation techniques.
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BACKGROUND: A core-shell type carboxylic acid modified resin was prepared and dye sorption characteristics of the resin were investigated. The resulting grafted resin material has been shown to be an efficient sorbent for removal of basic dyes from water as a result of the carboxylic acid group's affinity towards basic dye molecules. RESULTS: The resin was characterized using Fourier transform infrared spectroscopy (FT-IR) and titrimetric methods. The basic dyes (methylene blue and crystal violet) were removed by contacting the swollen resin with aqueous dye solutions at room temperature. The adsorption capacities of resin were determined by colorimetric analysis of the residual dye content in the adsorption medium, which gave capacities for methylene blue and crystal violet of 300 and 250 mg g−1 resin, respectively. The prepared resin is also able to remove basic dyes completely from dilute aqueous dye solutions. Batch kinetic sorption experiments determined that a pseudo-second-order rate kinetic model was applicable. CONCLUSION: Flexibility of the polymer side chains is expected to provide pseudo-homogeneous reaction conditions and easy accessibility of the functional groups involved. The adsorbents are expected to have the advantage of mobility of the grafted chains in the removal of basic dyes from aqueous mixtures. The resin has potential as an adsorbent for removal of basic dyes for use over a wide pH range. Copyright © 2011 Society of Chemical Industry
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Methylene blue
Acid dye
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The abilities of the macroporous chelating resin containing iminodiacetic groups (Purolite S930) and the weak basic anion exchanger Purolite A847 to remove the chromium complex dye (LnCr) from aqueous solutions in the batch system have been compared depending on the dye concentration, pH, reaction time and temperature.The maximum capacities (q eq ) for Purolite S 930 at pH = 2 and pH = 7 (1.5 and 2.0 mg/g, respectively) were lower as compared with the q eq for Purolite A847 (2.1 and 2.25 mg/g, respectively).The thermodynamic parameters (negative values of ΔS°, ΔG°) and values of activation energy (E a ) have revealed that LnCr dye removal using both resins is an exothermic, spontaneous ion exchange in conjunction with physical adsorption (ΔH° from -4.3 to -17.29 kJ mol -1 ).The FTIR spectra of unloaded and LnCr dye loaded anion exchanger Purolite A847 confirms the ion exchange and physical adsorption mechanisms.Isotherms and kinetic modeling studies demonstrate that the experimental data obtained for dye LnCr sorption on both resins well fit the Langmuir and Freundlich isotherms and pseudo second-order rate and intraparticle diffusion models.The rate of dye adsorption on both adsorbents is controlled by the co-acting of external mass transfer at the beginning of the process and then by intraparticle diffusion.
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Ion-exchange resin
Langmuir adsorption model
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The performance of two cation exchanger resins, Amberjet UP1400 and Amberlite IR120 in the process of Cs(I) ions removal from aqueous solutions was examined.Batch experiments were carried out to determine the influence of several parameters (resin dosage, contact time, temperature and initial concentration of Cs(I) ions) on the removal process.The equilibrium was reached after 60 min for Amberlite IR120 and after 120 min for Amberjet UP1400, with an overall adsorption performance of ~97% for both materials.The kinetics of the adsorption process was well approximated by the pseudo-second-order kinetic model.The equilibrium adsorption data were well described by the Langmuir model for Amberjet UP1400 and by the Sips model for Amberlite IR120.The calculated maximum adsorption capacities towards Cs(I) were of 6.36 mg/g for Amberjet UP1400 and of 8.67 mg/g for Amberlite IR120.The values of thermodynamic parameters H o and G o obtained demonstrated that the adsorption process was endothermic and spontaneous.The values calculated for the activation energy were of 3.48 kJ/mol for Amberjet UP1400 and 4.85kJ/mol for Amberlite IR120.
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The adsorptive separation of levulinic acid (LA) from its aqueous solution was studied by using a commercial adsorbent and weakly basic anion exchange resin, Amberlite IRA-67 (IRA-67). The data were generated for equilibrium and kinetic studies, and to analyze the performance of IRA-67 on the removal efficiency. The equilibrium study was performed to see the effect of adsorbent quantity (0.25–1.5 g) and initial LA concentrations (2–4 g·L–1) at three different temperatures (298, 308, and 318 K). To determine the kinetics of adsorption process, concentration profile was achieved up to a time of 90 min at 298 K. It was observed that both the intake capacity (32–64 mg·g–1) and removal efficiency (6.75–72.5%) of IRA-67 were increased with an increase in the quantity of adsorbent (0.25–1.5 g) at 298 K. From the kinetics of adsorption, 50 min was considered as an equilibrium time. Different isotherm and kinetic models were used to determine the equilibrium and kinetic parameters of LA adsorption process. From the temperature study (298, 308, and 318 K), the thermodynamic properties were also estimated at three different LA concentrations.
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Use of solvent impregnated resin in the separation has emerged as a new area of interest. It is a hybrid process with the characteristics of adsorption, ion-exchange and extraction. Here, Aliquat 336 impregnated Amberlite XAD-4 resin was used to remove Rhodamine-B and malachite green individually and from their mixtures in the aqueous solution. The performance of prepared resin was studied in batch mode to analyze the effect of adsorbent dosage, pH, concentration of dye solution, salt concentration, time, and temperature. Characterization (using FE-SEM, EDS, FTIR, and point of zero charge), regeneration, and cost analysis of the adsorbent were also done.
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Malachite green
Aliquat 336
Rhodamine B
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Amberlite
Calixarene
Moiety
Ion-exchange resin
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