Effect of time, pH, and temperature on kinetics for adsorption of methyl orange dye into the modified nitrate intercalated MgAl LDH adsorbent

Yadav, Balram Singh; Dasgupta, Sudip

doi:10.1016/j.inoche.2022.109203

Cited by 93 publications

(30 citation statements)

References 38 publications

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“…Temperature is another key parameter of the adsorption process. As explained by Yadav and Dasgupta [ 70 ], the increased retention of the dye chosen for their experiments when the temperature was raised from 20 °C to 30 °C could be the result of the increased dye flux getting to the adsorbent material, and of a more important diffusion rate. The decline in removal efficiency when the temperature was set at 40 °C could be the outcome of a reduced affinity of the dye to the adsorbent.…”

Section: Resultsmentioning

confidence: 99%

Performance of Dye Removal from Single and Binary Component Systems by Adsorption on Composite Hydrogel Beads Derived from Fruits Wastes Entrapped in Natural Polymeric Matrix

Grigoraș

Simion

Favier

et al. 2022

Gels

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The treatment of contaminated water is currently a major concern worldwide. This work was directed towards the preparation of a composite hydrogel by entrapping cherry stones powder on chitosan, which is known as one of the most abundant natural polymers. The synthesized material was characterized by scanning electron microscopy, by Fourier transform infrared spectroscopy, and by the point of zero charge determination. Its ability to remove two azo dyes models (Acid Red 66 and Reactive Black 5) existing in single form and in binary mixture was evaluated. Response Surface Methodology–Central Composite Design was used to optimize three parameters affecting the process while targeting the lowest final contaminant concentrations. The best results were obtained at pH 2, an adsorbent dose of 100 g/L, and a temperature of 30 °C, when more than 90% of the pollutants from the single component systems and more than 70% of those of the binary mixtures were removed from their aqueous solutions. The adsorption process was in accordance with Elovich and pseudo-second-order kinetic models, and closely followed the Freundlich and Temkin equilibrium isotherms. The obtained results led to the conclusion that the prepared hydrogel composite possesses the ability to successfully retain the target molecules and that it can be considered as a viable adsorbent material.

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Section: Resultsmentioning

confidence: 99%

Performance of Dye Removal from Single and Binary Component Systems by Adsorption on Composite Hydrogel Beads Derived from Fruits Wastes Entrapped in Natural Polymeric Matrix

Grigoraș

Simion

Favier

et al. 2022

Gels

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show abstract

“…Thus, the affinity of an adsorbent for different adsorbates is effectively compared by considering the adsorption capacity of the adsorbent for the pollutants in solution. Moreover, certain experimental factors such as solution pH, contact time, adsorbent dose, temperature, and adsorbate concentration could influence the adsorption capacity of an adsorbent material (Hegazy et al 2021;Yadav and Dasgupta 2022). Therefore, such experimental conditions must also be provided alongside the adsorption capacity for a holistic and reliable comparison.…”

Section: Adsorption Capacity Of Znonpsmentioning

confidence: 99%

Adsorption mechanism and modeling of radionuclides and heavy metals onto ZnO nanoparticles: a review

et al. 2022

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The contamination of environmental waters with heavy metals and radionuclides is increasing because of rapid industrial and population growth. The removal of these contaminants from water via adsorption onto metal nanoparticles is an efficient and promising technique to abate the toxic effects associated with these pollutants. Among metal nanoparticle adsorbents, zinc oxide nanoparticles (ZnONPs) have received tremendous attention owing to their biocompatibility, affordability, long-term stability, surface characteristics, nontoxicity, and powerful antibacterial activity against microbes found in water. In this review, we considered the adsorption of heavy metals and radionuclides onto ZnONPs. We examined the isotherm, kinetic, and thermodynamic modeling of the process as well as the adsorption mechanism to provide significant insights into the interactions between the pollutants and the nanoparticles. The ZnONPs with surface areas (3.93 to 58.0 m2/g) synthesized by different methods exhibited different adsorption capacities (0.30 to 1500 mg/g) for the pollutants. The Langmuir and Freundlich isotherms were most suitable for the adsorption process. The Langmuir separation factor indicated favorable adsorption of all the pollutants on ZnONPs. The pseudo-second-order kinetics presented the best for the adsorption of the adsorbates with regression values in the range of 0.986–1.000. Spontaneous adsorption was obtained in most of the studies involving endothermic and exothermic processes. The complexation, precipitation, ion exchange, and electrostatic interactions are the probable mechanisms in the adsorption onto ZnONPs with a predominance of complexation. The desorption process, reusability of ZnONPs as well as direction for future investigations were also presented.

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“…These adsorbents have drawbacks such as poor adsorbent capacity, which results in secondary contamination, lack of reusability, and other issues that prevent the widespread use of nanostructured adsorbents [23]. Additionally, anionic clays formed of hydrotalcite or layered double hydroxides (LDH) have become a favorable substitute for removing practically all types of harmful pollutants from wastewater [24].…”

Section: Introductionmentioning

confidence: 99%

Textural Properties and Adsorption Behavior of Zn-Mg-Al Layered Double Hydroxide Upon Crystal Violet Dye Removal as a Low Cost, Effective, and Recyclable Adsorbent

Abdel-Hady

Mohamed

Hafez

et al. 2022

Preprint

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The preparation of adsorbents plays a vital part in the adsorption method. In particular, many adsorbents with high specific surface areas and unique shapes are essential for the adsorption strategy. In this study, a Zn-Mg-Al/layer double hydroxide (LDH) had been designed via a facile co-precipitation process. Adsorbent based on Zn-Mg-Al/LDH was utilized to remove crystal violet (CV) from the wastewater. The impacts of the initial dye concentration, pH, and temperature on CV adsorption performance were systematically examined. The adsorbents were analyzed both before and after adsorption using FTIR, XRD, and SEM. The roughness parameters and surface morphologies of the produced LDH were estimated using 3D SEM images. Under the best conditions (dose of adsorbent = 0.07 g and pH = 9), the maximum adsorption capacity has been achieved. Adsorption kinetics studies revealed that the reaction that led to the adsorption of CV dye onto Zn-Mg-Al/LDH was a pseudo-second-order model. Additionally, intraparticle diffusion suggests that Zn-Mg-Al/LDH has fast diffusion constant for CV molecules (0.251 mg/(g.min1/2)). Furthermore, as predicted by the Langmuir model, the maximal Zn-Mg-Al/LDH adsorption capacity of CV was 64.80 mg/g. The CV adsorption equilibrium parameter (RL) onto Zn-Mg-Al/LDH was 0.769, indicating that adsorption was favorable. The effect of temperature was performed at 25, 35, and 45 oC in order to establish the thermodynamic parameters ∆Ho, ∆So, and ∆Go. The computed values indicated exothermic and spontaneous adsorption processes. The study presented here might be used to develop new adsorbents with enhanced adsorption capabilities for the purpose of protecting the environment of water. ‎

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Effect of time, pH, and temperature on kinetics for adsorption of methyl orange dye into the modified nitrate intercalated MgAl LDH adsorbent

Cited by 93 publications

References 38 publications

Performance of Dye Removal from Single and Binary Component Systems by Adsorption on Composite Hydrogel Beads Derived from Fruits Wastes Entrapped in Natural Polymeric Matrix

Performance of Dye Removal from Single and Binary Component Systems by Adsorption on Composite Hydrogel Beads Derived from Fruits Wastes Entrapped in Natural Polymeric Matrix

Adsorption mechanism and modeling of radionuclides and heavy metals onto ZnO nanoparticles: a review

Textural Properties and Adsorption Behavior of Zn-Mg-Al Layered Double Hydroxide Upon Crystal Violet Dye Removal as a Low Cost, Effective, and Recyclable Adsorbent

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