Adsorption removal of tartrazine by chitosan/polyaniline composite: Kinetics and equilibrium studies

Sahnoun, Sousna; Boutahala, Mokhtar

doi:10.1016/j.ijbiomac.2018.02.146

Cited by 113 publications

(45 citation statements)

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“…Adsorption isotherms can be better described by the Langmuir model. The Langmuir model assumes that the adsorption process is monolayer and uniformly adsorbed (Sahnoun and Boutahala, 2018), which is consistent with the adsorption kinetic results. However, when the temperature rises to 333 K, the R 2 of the Freundlich model increases to 0.8600 and the R 2 of the Langmuir model drops to 0.8362.…”

Section: Adsorption Of Pb 2þsupporting

confidence: 71%

Adsorption behaviors on trace Pb²⁺ from water of biochar adsorbents from konjac starch

Peng

2020

Adsorption Science & Technology

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Biochar adsorbents used to treat different heavy metals in water are efficient and low-cost. Appropriate raw materials, excellent selectivity and detailed adsorption mechanism are of important for research on biochar adsorbents. In this work, konjac starch was dispersed in polyvinylpyrrolidone (PVP) solution to prepare different sizes hydrophilic carbon spheres (HCSs) by hydrothermal synthesis method. Adsorption kinetics of the HCSs towards Pb2+ is described perfectly by the pseudo-second-order equation. With the temperature increasing, adsorption thermodynamics are more consistent with the Freundlich model. The calculated ΔG, ΔH and ΔS shows the adsorption of the HCSs towards Pb2+ is a spontaneous, endothermic and entropy increase process. In addition, HCSs have excellent selectivity for the adsorption of Pb2+ and Cu2+. HCSs prepared from konjac starch make full use of natural biomass resources, they can be used as a potential adsorbent material in treatment on heavy metal ion from water field.

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Section: Adsorption Of Pb 2þsupporting

confidence: 71%

Adsorption behaviors on trace Pb²⁺ from water of biochar adsorbents from konjac starch

Peng

2020

Adsorption Science & Technology

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“…Figure 4 presents the results of the effect of pH and agitation speed on the adsorption of tartrazine, using HDTMA-Bent. Decolorization of the solution is not significantly affected in the range of pH from 2 to 9, where the average removal was 99.07 ± 0.93%, this being a favorable aspect for the application of this material since the colored wastewater has pH values near 7 [67]. For a pH > 9, a negative effect on the removal of tartrazine was observed because, at high pH values, the electrostatic repulsion between the surface of the adsorbent, negatively charged, and the anionic dye reduces the adsorption capacity and removal of coloring [68, 69].…”

Section: Resultsmentioning

confidence: 99%

Tartrazine Removal from Aqueous Solution by HDTMA-Br-Modified Colombian Bentonite

Otavo-Loaiza

Sanabria‐González

Giraldo-Gómez

2019

The Scientific World Journal

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The effect of pH, ionic strength (NaCl added), agitation speed, adsorbent mass, and contact time on the removal of tartrazine from an aqueous solution, using an organobentonite, has been studied. A complete factorial design 32 with two replicates was used to evaluate the influence of the dye concentration (30, 40, and 50 mg/L) and amount of adsorbent (25, 35, and 45 mg) on decolorization of the solution. Experimental data were evaluated with Design Expert® software using a response surface methodology (RSM) in order to obtain the interaction between the processed variables and the response. pH values between 2 and 9, stirring speed above 200 rpm, and contact time of 60 min did not have a significant effect on decolorization. The optimum conditions for maximum removal of tartrazine from an aqueous solution of 30 mg/L were follows: pH = 6.0, NaCl concentration = 0.1 M, stirring speed = 230 rpm, temperature = 20°C, contact time = 60 min, and the organobentonite amount = 38.04 mg. The equilibrium isotherm at 20°C was analyzed by means of the Langmuir and Freundlich models, and the maximum adsorption capacity obtained was 40.79 ± 0.71 mg/g. This adsorption process was applied in a sample of industrial wastewater containing tartrazine and sunset yellow, having obtained a decolorization rate higher than 98% for both dyes. These results suggest that organobentonite is an effective adsorbent for the removal of anionic dyes from an aqueous solution.

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“…Also, according to Table 5, the initial pH presented negative effect values, both for the removal efficiency and the pseudo-1 st -order rate constant, which means that increasing the pH from 7 to 10, led to a decrease for both response variables. Tartrazine molecule has three types of acidic H + ions, the -SO3 -, the -COO -, and the OH -, the pKa of each group is, respectively, around 2.0, 5.0, and 9.5 54,55 . So, at pH 7, the tartrazine molecule can be considered a monoprotic acid, with overall charge -3, as we abbreviate as HTart -3 .…”

Section: Discussionmentioning

confidence: 99%

Factorial design of experiments for optimization of photocatalytic degradation of tartrazine by zinc oxide (ZnO) nanorods with different aspect ratios

Skinner

DiBernardo

Masud

et al. 2020

Journal of Environmental Chemical Engineering

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The photocatalytic degradation of the azo dye tartrazine using zinc oxide (ZnO) as photocatalyst under ultraviolet light was investigated using a 2 4 factorial design. The variables studied were the aspect ratio of ZnO nanorods, the ZnO load, the initial pH of tartrazine solution, and the H 2 O 2 volume. These variables were studied aiming to maximize the tartrazine removal efficiency and the pseudo-1 st-order rate constant of the removal process. The ZnO aspect ratio was tuned by varying the Lewis base during the synthesis, hexamethylenetetramine (HMTA) was used to prepare ZnO with low aspect ratio (ZnO_LowAR), and NaOH was used to prepare ZnO with high aspect ratio (ZnO_HighAR). The microstructural characterizations indicated that ZnO_LowAR and ZnO_HighAR nanorods have similar structural, textural and optical properties. The only exception was the dimensions of the nanorods obtained, which could result in differences in the facets exposed on each type of nanorod surface. The factorial design revealed that ZnO aspect ratio, the initial pH of tartrazine solution, and the H 2 O 2 volume all have primary significant effects, whereas the ZnO load is not significant neither in the tartrazine removal efficiency nor in the pseudo-1 st-order rate constant. Statistical models considering the coefficients of the significant interactions were obtained, leading to reasonable predicted results in comparison to the results experimentally obtained. The conditions leading to highest removal efficiency (~92%) and pseudo-1 st-order rate constant (3.81 x 10-2 min-1) were carried out with ZnO_HighAR, initial pH 7, and without H 2 O 2 , which outperformed the TiO 2 P-25 under the same conditions. File list (2) download file view on ChemRxiv Photocat Deg of Tart by ZnO_repository_v1.pdf (1.55 MiB) download file view on ChemRxiv Supp Info_v1_march24_2020.pdf (470.79 KiB)

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Adsorption removal of tartrazine by chitosan/polyaniline composite: Kinetics and equilibrium studies

Cited by 113 publications

References 46 publications

Adsorption behaviors on trace Pb²⁺ from water of biochar adsorbents from konjac starch

Adsorption behaviors on trace Pb²⁺ from water of biochar adsorbents from konjac starch

Tartrazine Removal from Aqueous Solution by HDTMA-Br-Modified Colombian Bentonite

Factorial design of experiments for optimization of photocatalytic degradation of tartrazine by zinc oxide (ZnO) nanorods with different aspect ratios

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Adsorption removal of tartrazine by chitosan/polyaniline composite: Kinetics and equilibrium studies

Cited by 113 publications

References 46 publications

Adsorption behaviors on trace Pb2+ from water of biochar adsorbents from konjac starch

Adsorption behaviors on trace Pb2+ from water of biochar adsorbents from konjac starch

Tartrazine Removal from Aqueous Solution by HDTMA-Br-Modified Colombian Bentonite

Factorial design of experiments for optimization of photocatalytic degradation of tartrazine by zinc oxide (ZnO) nanorods with different aspect ratios

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Adsorption behaviors on trace Pb²⁺ from water of biochar adsorbents from konjac starch

Adsorption behaviors on trace Pb²⁺ from water of biochar adsorbents from konjac starch