Application of Fe 3 O 4 @THAM-CH 2 CH 2 Cl magnetic nanoparticle as a new adsorbent in ultrasonically assisted removal of Congo red from aqueous solutions (original) (raw)
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Magnetic nanopowder as effective adsorbent for the removal of Congo Red from aqueous solution
Water Science & Technology, 2014
A magnetic iron oxide nanopowder (MnP), prepared by a simple and efficient combustion synthesis technique, was tested for the removal of the anionic dye Congo Red (CR) from aqueous solution. The influence of solution pH, adsorbent dose, temperature, contact time and initial dye concentration on the adsorption of CR onto MnP were investigated. It was shown that the CR adsorption was pH dependent and the adsorption mechanism was governed by electrostatic forces. The adsorption kinetic was best described by the pseudo-second-order model and the equilibrium data were well fitted to the Langmuir isotherm, yielding maximum adsorption capacity of 54.46 mg g−1. The undeniable advantages of the MnP adsorbent such as inexpensive preparation method, good adsorption capacity and easy separation using an external magnetic field, recommend it as a promising candidate for the removal of anionic dyes from polluted water.
DESALINATION AND WATER TREATMENT
The removal of Congo red dye from aqueous solutions by adsorption reaction onto three distinct adsorbents: graphene oxide (GO), graphene oxide-grafted-3,3'-diaminobenzidine (GO/ DAB), and GO/DAB-grafted-ethylenediaminetetraacetic acid (GO/DAB/EDTA) was investigated in batch experiments. The study of the effects of pH and contacting time on adsorption systems is the first step in optimizing them. The results revealed that depending on the type of adsorbent, the optimum pH values and periods differed. The Congo red (CR) dye adsorptions onto the investigated adsorbents GO, GO/DAB, and GO/DAB/EDTA required pH (3.0, 7.0, and 5.0, respectively) and time (60, 30, and 45 min). The fundamental adsorption properties of the dye were evaluated using adsorption equilibrium isotherms, namely the Langmuir, Freundlich, and Dubinin-Radushkevich models. The maximum adsorption values (q max) were calculated using the Langmuir isotherm results, and they were 1,250; 1,428.5 and 1,438.1 mg/g for the adsorption of CR dye onto adsorbents GO, GO/DAB, and GO/DAB/EDTA, respectively, and these results proved the preference for prepared GO-derivatives over GO. The kinetic models, namely pseudo-first-order and pseudo-second-order, were employed to understand the mechanism of the adsorption process, and they fitted very well with the pseudo-second-order kinetic model, which relies on the assumption that chemisorption may be the rate-limiting step. This study reveals that the presence of functional groups and active sites on the studied adsorbent contributed to its high affinity for CR dye adsorption. As a result, they can be used as efficient and cost-effective dye adsorbents in industrial effluent. Thermodynamic parameters including enthalpy ΔH°, entropy ΔS°, free energy ΔG°, and activation energy E a of the adsorption process were calculated and used to interpret the results, which revealed that the adsorption systems were a spontaneous and endothermic process for GO and its composites. Also, low activation energy values (E a < 40 kJ/mol) were characteristics of the physisorption mechanism and diffusion-controlled process.
Orbital - The Electronic Journal of Chemistry, 2016
Vigna unguiculata seed husk powder has been investigated as low cost adsorbent for the removal of hazardous chemicals like Congo Red (CR) dye from aqueous solution. Various parameters such as effect of contact time, initial CR dye concentration, adsorbent dose, effect of pH, zero-point pH were studied. Batch adsorption technique was employed to optimize the process parameter. The result indicated that, the percentage adsorption of Congo Red increased with increase in contact time, dose of adsorbent and initial concentration of Congo Red and decreased with addition of salt. The adsorption of Congo Red was 78% at the optimum pH of 6. Adsorption equilibrium was found to be reached in 24 h for 5 to 25 g/50 mL Congo red concentrations. The Langmuir and Freundlich isotherm models were found to provide an excellent fitting of the adsorption data. The adsorption of CR follows Second order rate kinetics. Thermodynamic parameter (ΔG o) showed that it was an exothermic process. This adsorbent was found to be effective and economically attractive.
Removal of congo red from aqueous solution by adsorption onto acid activated red mud
Journal of Hazardous Materials, 2006
The objective of this study is to remove the congo red (CR) anionic dye, from water by using the acid activated red mud in batch adsorption experiments. The effects of contact time, pH, adsorbent dosage and initial dye concentration on the adsorption were investigated. The pH of the dye solution strongly affected the chemistry of both the dye molecules and activated red mud in an aqueous solution. The effective pH was 7.0 for adsorption on activated red mud. It was found that the sufficient time to attain equilibrium was 90 min. The adsorption isotherms were analyzed using the Langmuir, the Freundlich, and the three parameter Redlich-Peterson isotherms. The Langmuir isotherm was the best-fit adsorption isotherm model for the experimental data obtained from the non-linear chi-square statistic test.
2020
In this work, the adsorption of the anionic dye, Congo red (CR), from aqueous solution by using tea waste (TW) has been carried out at 30 °C. The equilibrium sorption isotherms and kinetics were investigated. The equilibrium adsorption was studied by the Langmuir and Freundlich models of adsorption. The experimental results manifested that the Langmuir isotherm was the best model for the adsorption of CR by TW and implied the monolayer adsorption of CR on TW with the adsorption capacity of 40.6 mg/g at 30 °C. The kinetic data resulted from batch experiments were analyzed using pseudo-first-order and pseudo-second-order models. It was found that pseudosecond-order model provided the best fit for the experimental data (R 2 >0.99). The results illustrated that both silica and Fe 2 O 3 nanoparticles increased the adsorption of CR on TW by about 5% and 10% at 30 °C, respectively. The results suggested that TW should be a potential low-cost adsorbent for the removal of CR from aqueous ...
Adsorption Study of Congo red from Aqueous Solution onto Cadmium and Nickel Ferricyanides
2014
Accepted on 14 October 2014 _____________________________________________________________________________ ABSTRACT The adsorption behavior of Congo red from aqueous solution on cadmium ferricyanide and nickel ferricyanide were studied under various conditions of contact time, different pH and temperature by varying initial concentration of Congo red using batch technique. Prepared metal ferricyanides were characterized by FTIR, SEM, CHN analysis, TGA and XRD. Adsorption capacity of Congo red on cadmium ferricyanide and nickel ferricyanide were decreased with increasing the pH from 2 to 7 of aqueous solution and increased gradually from 7 to 11. Adsorption capacity also increased with increasing concentration of Congo red. Results were analyzed by Langmuir and Freundlich models of adsorption. Cadmium ferricyanide was found to be a better adsorbent than Nickel ferricyanide. Thermodynamic parameters like free energy (ΔG), enthalpy (ΔH) and entropy (ΔS) of the system suggested that adso...
2013
In this work, the adsorption of the anionic dye, Congo red (CR), from aqueous solution by using tea waste (TW) has been carried out at 30 °C. The equilibrium sorption isotherms and kinetics were investigated. The equilibrium adsorption was studied by the Langmuir and Freundlich models of adsorption. The experimental results manifested that the Langmuir isotherm was the best model for the adsorption of CR by TW and implied the monolayer adsorption of CR on TW with the adsorption capacity of 40.6 mg/g at 30 °C. The kinetic data resulted from batch experiments were analyzed using pseudo-first-order and pseudo-second-order models. It was found that pseudosecond-order model provided the best fit for the experimental data (R 2 >0.99). The results illustrated that both silica and Fe 2O3 nanoparticles increased the adsorption of CR on TW by about 5% and 10% at 30 °C, respectively. The results suggested that TW should be a potential low-cost adsorbent for the removal of CR from aqueous so...
Kinetic and Isotherm Studies of Congo Red Adsorption from Aqueous Solution by Biowaste Material
Chemical Science Transactions
Toxicity caused by the presence of synthetic dyes in aquatic system is extremely important from the environmental point of view because most of these dyes are toxic, carcinogenic and mutagenic. In the present work the ability to remove 'Congo red' from aqueous solution has been studied by using waste material Pigeon dropping, as an adsorbent. Effects of various parameters on adsorption process such as; contact time, adsorbent dose, initial dye concentrations, pH and temperature was studied. The isotherm data was described by the Langmuir and Freundlich adsorption isotherms. The kinetic data were used for modelling from the second-order kinetic models and intra-particle diffusion model. The thermodynamic studies showed that the process is exothermic and physiosorption. The present investigation confirms that Pigeon dropping can be successfully employed as a good adsorbent for the removal of dye from effluent.
Surfaces and Interfaces, 2019
In the present study, the zinc ferrite nanoparticle was synthesized, and the silica layer was fixed on this nanoparticle. Then, the nanocomposite surface of the natural biocompatible polymer of tragacanth gum (TG) was modified and nanocomposite was identified by transmission electron microscope (TEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR) and vibrational sample magnetometer (VSM). The synthesized nanocomposite was used for congo red (CR) removal from aqueous solutions. The effect of different parameters such as pH, contact time, initial dye concentrations, adsorbent dosage and solvent temperature for adsorption process has been studied. The results showed that in the optimum conditions pH= 5, contact time= 60 min, initial dye concentration= 60 mg/L, and adsorbent dose= 0.2 g/L, was maximum adsorption capacity was 159.90 mg/g. Furthermore, according to the results, it was determined that the adsorption of CR follows the Langmuir isotherm and the second-order kinetics. The thermodynamic parameters showed that the adsorption process of Znfe 2 o 4 /SiO 2 /Tragacanth gum nanocomposite was a spontaneous and endothermic process.