Adsorption characteristics of cesium onto mesoporous geopolymers containing nano-crystalline zeolites

Lee, Nam-Kon; Khalid, Hammad R.; Lee, Haeng‐Ki

doi:10.1016/j.micromeso.2017.01.030

Cited by 87 publications

(40 citation statements)

References 58 publications

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“…As shown in Figure D, the adsorption process of MB onto the CG900/KGP particles was within 60 minutes. The adsorption kinetic of the MB onto CG900/KGP could been studied by 3 normal models, pseudo‐first‐order Equation , pseudo‐second‐order Equation and intraparticle diffusion Equation , which could be expressed as follows:

log false(q_{e} - q_{t} false) = log q_{normale} - \frac{k_{1}}{2.303} t

\frac{t}{q_{t}} = \frac{1}{k_{2} {q_{normale}}^{2}} + \frac{t}{q_{e}}

q_{normalt} = k_{normalid} t^{1 / 2} + C

…”

Section: Resultsmentioning

confidence: 99%

“…Adsorption isotherm modes were useful in revealing the adsorption mechanisms of porous adsorbents, such as the Langmuir and Freundlich adsorption isotherms. The 2 equations could be used to describe the interactions between the adsorbent and adsorbate, especially for porous geopolymer materials . Herein, based on the nature and type of the CG/KGP composites adsorption system, the Langmuir Equation and Freundlich model equation Equation were introduced and expressed as follows:

\frac{c_{e}}{q_{e}} = \frac{c_{e}}{q_{\max}} + \frac{1}{q_{normalmax} k_{normalL}}

ln q_{normale} = ln k_{normalF} + \frac{1}{n} ln c_{normale}

…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of novel low‐cost porous gangue microsphere/geopolymer composites and their adsorption properties for dyes

Yan

Jia

et al. 2018

Int J Applied Ceramic Tech

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A novel porous coal gangue microsphere/geopolymer (CG/KGP) composite was firstly synthesized by adding gangue microspheres into geopolymer matrix. Effects of precalcined temperature of CG microspheres on the microstructure and specific surface area of the porous CG/KGP particles were systematically investigated. Adsorption properties of the CG/KGP composites were also reported. Results showed that the CG/KGP composites contained mainly amorphous phase and many functional groups were on the particle surface. The precalcined CG microspheres were dispersed homogenously and bonded well with the KGP matrix. The CG900/KGP samples showed better adsorption properties than the pure KGP. As for the dosage of 4 g/L (starting concentration, 100 mg/L), adsorption capacity achieved the highest value of 24.6 mg/g and the removal efficiency reached 98%. Adsorption of MB onto CG900/KGP particles followed the pseudo‐second‐order kinetic model. The novel porous CG/KGP composite has potential application in wastewater filtration and adsorption treatment.

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log false(q_{e} - q_{t} false) = log q_{normale} - \frac{k_{1}}{2.303} t

\frac{t}{q_{t}} = \frac{1}{k_{2} {q_{normale}}^{2}} + \frac{t}{q_{e}}

q_{normalt} = k_{normalid} t^{1 / 2} + C

…”

Section: Resultsmentioning

confidence: 99%

\frac{c_{e}}{q_{e}} = \frac{c_{e}}{q_{\max}} + \frac{1}{q_{normalmax} k_{normalL}}

ln q_{normale} = ln k_{normalF} + \frac{1}{n} ln c_{normale}

…”

Section: Resultsmentioning

confidence: 99%

Synthesis of novel low‐cost porous gangue microsphere/geopolymer composites and their adsorption properties for dyes

Yan

Jia

et al. 2018

Int J Applied Ceramic Tech

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“…Considering that zeolite A [39] and faujasite [40] succeed to zeolite P, the presence of these zeolite crystals in the H-series sample with elevated pressure may correlate to its likely durability performance. Specifically, employing NaOH as an activator for fly ash could be plausible for use as a structural element where long-term durability is mandatory, and where mechanical properties are of less concern (i.e., molecular sieve [41] or radioactive waste immobilization [24,26]). On the other hand, the zeolite phases formed in these samples may not be considered to have followed a general phenomenon, since the synthesis of zeolites is significantly influenced by temperature [42].…”

Section: Discussionmentioning

confidence: 99%

“…The samples were cured at room temperature after the first 24 h of curing. Note that a pressure of 0.22 MPa was reached at this temperature, which was deemed effective in terms of the crystallization in the geopolymer [24,26]. The experimental parameters including mixture proportion and curing conditions employed in this study were adapted from the relevant literature [8,16].…”

Section: Sample Preparationmentioning

confidence: 99%

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Pressure-Induced Geopolymerization in Alkali-Activated Fly Ash

et al. 2018

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The present study investigated geopolymerization in alkali-activated fly ash under elevated pressure conditions. The fly ash was activated using either sodium hydroxide or a combination of sodium silicate solution and sodium hydroxide, and was cured at 120 • C at a pressure of 0.22 MPa for the first 24 h. The pressure-induced evolution of the binder gel in the alkali-activated fly ash was investigated by employing synchrotron X-ray diffraction and solid-state 29 Si and 27 Al MAS NMR spectroscopy. The results showed that the reactivity of the raw fly ash and the growth of the zeolite crystals were significantly enhanced in the samples activated with sodium hydroxide. In contrast, the effects of the elevated pressure conditions were found to be less apparent in the samples activated with the sodium silicate solution. These results may have important implications for the binder design of geopolymers, since the crystallization of geopolymers relates highly to its long-term properties and functionality.

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Aluminosilicate Inorganic Polymers (Geopolymers): Emerging Ion Exchangers for Removal of Metal Ions

El‐Eswed

2019

Applications of Ion Exchange Materials in the Environment

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Adsorption characteristics of cesium onto mesoporous geopolymers containing nano-crystalline zeolites

Cited by 87 publications

References 58 publications

Synthesis of novel low‐cost porous gangue microsphere/geopolymer composites and their adsorption properties for dyes

Synthesis of novel low‐cost porous gangue microsphere/geopolymer composites and their adsorption properties for dyes

Pressure-Induced Geopolymerization in Alkali-Activated Fly Ash

Aluminosilicate Inorganic Polymers (Geopolymers): Emerging Ion Exchangers for Removal of Metal Ions

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