Evaluation of the selective adsorption of silica-sand/anionized-starch composite for removal of dyes and Cupper(II) from their aqueous mixtures
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Keywords:
Chemisorption
Langmuir adsorption model
Cationic polymerization
Selective adsorption
Methylene blue
Crystal violet
In this work, nanosilica was extracted from stem sweep and used as a new adsorbent for the simultaneous removal of the crystal violet (CV) and methylene blue (MB) dyes in a batch mode.The influence of the experimental variables including the solution pH, adsorbent dosage, initial dye concentration, and contact time on the adsorption process was studied.Analysis of the equilibrium data revealed that adsorption of the understudied dyes in single and binary systems can be fitted to the Langmuir and the extended-Langmuir isotherms, respectively.Kinetic investigations carried out on the CV and MB removal suggested that the adsorption processes followed a pseudo-second order kinetics rate.For the first time, a modeling of the simultaneous removal of CV and MB on the prepared adsorbent was presented using the random forest (RF) and multiple linear regression (MLR) methods.The random forest (RF) model, recognized as a reliable and powerful computational technique, was used to predict the removal percentage of the cited dyes in a binary mixture as a function of the experimental parameters.The mean square errors (MSEs) and squared correlation coefficients (R 2 s) for CV were 3.29 and 0.9754, respectively, and those for MB were 2.41 and 0.9781, respectively.These results confirm the ability and accuracy of the proposed RF model (with respect to the multiple linear regression method) for estimating the behavior of the adsorption processes under different experimental conditions.For the first time, a dish-washing liquid was used, as a cheap and available solvent, for the regeneration of the proposed adsorbent.
Methylene blue
Crystal violet
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Prepared material-supported Fe/Ni particles (PM-Fe/Ni) were produced and applied as an adsorbent, reductant and Fenton-like catalyst for removing methylene blue (MB) and crystal violet (CV) from aqueous solutions. Fe/Ni particles were prepared by reducing ferric chloride with sodium borohydride and supported on the produced porous material. Various techniques including X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy analysis (SEM) were employed to characterize the crystal phase, surface area, surface morphology and functional groups. Removal experiments were conducted to study the effects of different factors such as PM-Fe/Ni dosage, initial pH, H2O2 concentration, initial concentrations and temperature on MB and CV removal. The removal efficiency of CV and MB by PM-Fe/Ni/H2O2 were 91.86% and 61.41% under the conditions of dye concentration of 1000 mg L-1, H2O2 concentration of 50 mM, PM-Fe/Ni dosage of 0.20 g and temperature of 293 K. The analysis of the degradation kinetics showed that the degradation of MB and CV followed well pseudo-first-order kinetics. A possible mechanism of removal of MB and CV was proposed, including the adsorption, reduction and dominating Fenton oxidation. The regeneration experiments of PM-Fe/Ni demonstrated that PM-Fe/Ni with H2O2 still showed a high removal efficiency after six reaction cycles.
Methylene blue
Crystal violet
Crystal (programming language)
Methylene
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Polyethylenimine
Langmuir adsorption model
Congo red
Selective adsorption
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Synthesized hydroxyapatite (Hyd) and Fe-hydroxyapatite (Fe-Hyd) composite were used for the removal of Methylene Blue (MB) from aqueous solutions in this study. The effect of adsorbent amount, pH and initial MB concentration were carried out to investigate in the aqueous solution. The kinetic study shows that the MB adsorption process with Hyd or Fe-Hyd follow pseudo-second order kinetic model. Experimental results are well fitted to the Langmuir isotherm model. The maximum adsorption capacities of Hyd and Fe-Hyd were obtained as 2.90 mg/g and 5.64 mg/g for MB according to Langmuir Isotherm models, respectively. Fe-Hyd composite increased the adsorption capacity of Hyd by 1.95 times that Hyd. It is concluded that Fe-Hyd composite is promising and economical adsorbent for MB removal in the aqueous solution.
Methylene blue
Langmuir adsorption model
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Methylene blue
Langmuir adsorption model
Zeta potential
BET theory
Cationic polymerization
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In this communication, Carbon aerogels were prepared by hydrothermal process using glucose as raw material and the structure and morphology were characterized by XRD, SEM, and IR. Methylene blue was removed by employing the as-prepared nano materials as adsorbent. The maximum adsorption capacity determined from the Langmuir adsorption isotherm was 819.67 mg.g-1 and adsorption kinetics and adsorption isotherms were also studied.
Methylene blue
Langmuir adsorption model
Carbon fibers
Morphology
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Almond shells are considered as agricultural waste. In this study almond shells were chosen as effective adsorbents for removing Crystal Violet (CV) from dye solutions. The experimental data was analyzed via the Langmuir, Freudlich and Tempkin isotherm models to obtain isotherm model for the system and the data shows that the Langmuir isotherm model fitted best. Also, the thermodynamics parameters such as ΔH0, ΔG0 and ΔS0 were investigated. The results of the study show that almond shells are efficient and advantageous economically for removing CV from aqueous solutions. The maximum adsorption capacity was found to be 1.1375mg/g on almond shell. Adsorption kinetic studies indicate that the adsorption data can be represented by a pseudo second order model.
Crystal violet
Langmuir adsorption model
Agricultural waste
Sorption isotherm
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Crystal violet
Langmuir adsorption model
Husk
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Crystal violet
Langmuir adsorption model
Brilliant green
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MnO2 nanoparticles were prepared by one-step redox under room temperature,and the adsorption performance of methylene blue was studied. The results indicated that the MnO2 nanoparticles was amorphous δ-MnO2 with uniform size,and showed excellent adsorption performance. The maximum adsorption amount could be 157. 7 mg / g,and the adsorption process agreed well with Langmuir isotherm and pseudo-second-order kinetics model.
Methylene blue
Langmuir adsorption model
Sorption isotherm
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