Uranium (VI) adsorption on synthesized 4A and P1 zeolites: Equilibrium, kinetic, and thermodynamic studies

Barkat, M.; Nibou, Djamel; Amokrane, Samira; Chegrouche, Salah; Mellah, A.

doi:10.1016/j.crci.2014.09.011

Cited by 46 publications

(10 citation statements)

References 18 publications

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“…The negative values of ΔH° indicate that the adsorption process of MB and BY28 onto SW PMMA is exothermic.The ΔH° values suggest that the adsorption process is physical when the enthalpy values are less 40 kJ mole -1[58,59]. The results of Table8confirm this assumption.…”

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confidence: 62%

Removal of Methylene Blue and Basic Yellow 28 Dyes from Aqueous Solutions Using Sulphonated Waste Poly Methyl Methacrylate

et al. 2019

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This work focuses on two different environmental problems: the recovery of plastic wastes PMMA (W PMMA) and their application in the removal of textile dyes Methylene Blue (MB) and Basic Yellow 28 (BY28) in aqueous solutions. The selected waste plastic was upgraded to produce an adsorbent suitable for dyes removal. For that, the material was grinded cryogenically up to a particle size of less than 100 μm and treated with sulfuric acid. The sulphonated waste PMMA (SW PMMA) was characterized by FTIR, scanning electronic microscopy (SEM) and chemical composition analysis (C, H, N, O and S content). The formation of sulphonic groups in the material after sulphonation reaction has been successfully demonstrated by FTIR, and can be observed mainly in the region 3087 cm -1 to 3657 cm -1 , where an intense band bound to the stretching of the SO 3 H appeared; another absorption band appeared in the region from 1080 cm -1 to 1271 cm -1 that corresponds to the symmetric stretching of the SO 2 group. The effects of solution pH, initial dyes concentration, adsorbent dose and temperature were studied in batch experiments. The obtained data showed that SW PMMA adsorbent exhibit significant adsorption capacities of 97.09 and 222.

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confidence: 62%

Removal of Methylene Blue and Basic Yellow 28 Dyes from Aqueous Solutions Using Sulphonated Waste Poly Methyl Methacrylate

et al. 2019

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“…Both processes are parallel, but one of them is prevailing depending on the solid to the liquid ratio, [31]. Ion exchange properties of zeolites are due to the weakly bonded extraframework cations which are mobile and easily exchanged with solution cations [32]. As it has been stated, removal of heavy metals from aqueous solution by means of zeolite is mainly is based on adsorption and ion exchange process.…”

Section: Chemical Compositionmentioning

confidence: 99%

Removal of Heavy Metals Cd (II), Fe (III) and Ni (II), from Aqueous Solutions by Natural (Clinoptilolite) Zeolites and Application to Industrial Wastewater

El-Azim

Mourad

2018

AJEE

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The adsorption mechanism of Cd, Fe, and Ni, ions on natural (clinoptilolite) zeolites, a regional lowcost natural available adsorbent was studied in a batch adsorption system. The effect of several parameters such as contact time, zeolite dose, particle size, the effect of pH, and initial concentration of metal ions in the adsorption process was estimated. The optimum adsorption was found to occur at pH 6.0, adsorbent dose 1.0 g/L, and initial concentration 2, 20 and 10 mg/L for Cd, Fe, and Ni, respectively. The adsorption efficiency also increases with decreasing particle size of zeolites and the effect of retention time on adsorption ratio shows that 80% of the Cd, Fe, and Ni, are adsorbed by zeolite during first 120 minutes. Under these optimum conditions, the removal efficiency was 78.8, 89.1, and 65.5% of Cd

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“…The Langmuir adsorption model assumes that the adsorption occurs at specific homogeneous sites within the adsorbents, and the adsorption's energy is constant [58]. It presumes, when an active site is occupied by an ion, that no further sorption takes place at this site [41,59]. The Langmuir isotherm equation is expressed as:…”

Section: Adsorption Kineticsmentioning

confidence: 99%

“…where K f is the multilayer adsorption capacity (mg/g), and 1/n is the sorption intensity. Similarly, The Dubinin-Radushkevich (D-R) isotherm model does not assume that the materials have homogeneous surfaces [59]. Instead, it considers that the interaction between adsorbate and adsorbent can be independent of temperature by using the adsorption potential, ε.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Separation of Radionuclides from a Rare Earth-Containing Solution by Zeolite Adsorption

Talan

Huang

2020

Minerals

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The increasing industrial demand for rare earths requires new or alternative sources to be found. Within this context, there have been studies validating the technical feasibility of coal and coal byproducts as alternative sources for rare earth elements. Nonetheless, radioactive materials, such as thorium and uranium, are frequently seen in the rare earths’ mineralization, and causes environmental and health concerns. Consequently, there exists an urgent need to remove these radionuclides in order to produce high purity rare earths to diversify the supply chain, as well as maintain an environmentally-favorable extraction process for the surroundings. In this study, an experimental design was generated to examine the effect of zeolite particle size, feed solution pH, zeolite amount, and contact time of solid and aqueous phases on the removal of thorium and uranium from the solution. The best separation performance was achieved using 2.50 g of 12-µm zeolite sample at a pH value of 3 with a contact time of 2 h. Under these conditions, the adsorption recovery of rare earths, thorium, and uranium into the solid phase was found to be 20.43 wt%, 99.20 wt%, and 89.60 wt%, respectively. The Freundlich adsorption isotherm was determined to be the best-fit model, and the adsorption mechanism of rare earths and thorium was identified as multilayer physisorption. Further, the separation efficiency was assessed using the response surface methodology based on the development of a statistically significant model.

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Uranium (VI) adsorption on synthesized 4A and P1 zeolites: Equilibrium, kinetic, and thermodynamic studies

Cited by 46 publications

References 18 publications

Removal of Methylene Blue and Basic Yellow 28 Dyes from Aqueous Solutions Using Sulphonated Waste Poly Methyl Methacrylate

Removal of Methylene Blue and Basic Yellow 28 Dyes from Aqueous Solutions Using Sulphonated Waste Poly Methyl Methacrylate

Removal of Heavy Metals Cd (II), Fe (III) and Ni (II), from Aqueous Solutions by Natural (Clinoptilolite) Zeolites and Application to Industrial Wastewater

Separation of Radionuclides from a Rare Earth-Containing Solution by Zeolite Adsorption

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