Liquid–Solid Mass Transfer in Adsorption Systems—An Overlooked Resistance?

Inglezakis, Vassilis J.; Balsamo, Marco; Montagnaro, Fabio

doi:10.1021/acs.iecr.0c05032

Cited by 57 publications

(30 citation statements)

References 62 publications

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“…Finally, a comparison of the values of surface diffusion and pores transport resistances through values highlights that both intraparticle mechanisms are relevant (cf. also the discussion reported in Inglezakis et al) …”

Section: Resultssupporting

confidence: 68%

“…both intraparticle mechanisms are relevant (cf. also the discussion reported in Inglezakis et al) 47. 3.5.…”

supporting

confidence: 62%

“…In order to compare the relative importance of intraparticle versus fluid film mass transfer resistance, the Biot number can be invoked . In particular, for the analysis of the PVSDM-MBI case, we define in the present work an average Biot number as where represents the mean integral value of the surface diffusivity function expressed by eq .…”

Section: Materials and Methodsmentioning

confidence: 99%

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Experimental and Modeling Studies of Sr²⁺ and Cs⁺ Sorption on Cryogels and Comparison to Commercial Adsorbents

Baimenov

Montagnaro

Inglezakis

et al. 2022

Ind. Eng. Chem. Res.

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In this work, two cryogels with the key monomers methacrylic acid and 2-acrylamido-2-methyl-1-propansulfonic acid (named AAC and SAC, respectively) with various functional groups were used as adsorbents for the removal of cesium and strontium ions from aqueous solutions. Kinetics, equilibrium, and column studies were carried out including experiments in different water matrices (ultrapure, tap, and river water) and comparison to commercial adsorbents. AAC reached sorption capacity of 362 mg g −1 for Cs + and 209 mg g −1 for Sr 2+ , whereas SAC polymer showed maximum removal capacities of 259 and 211 mg g −1 for Cs + and Sr 2+ , respectively. The five cycles of adsorption/desorption experiments showed a maximum of 8% loss of effectiveness for both cryogels. Batch kinetics adsorption data were modeled by using a rigorous diffusional model coupled to a novel fractal-like expression for variable surface diffusivity. The model revealed that the surface diffusivity dependence on time is nonmonotonic, with the occurrence of a maximum. Also, both fluid film and intraparticle transport resistances were shown to be important, with the internal one being more influential. The cryogels and two commercial materials (ion-exchange resin and zeolite) were tested for the removal of Cs + and Sr 2+ in ultrapure, tap, and river water; the results showed that the cryogels exhibit competitive effectiveness.

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Section: Resultssupporting

confidence: 68%

“…both intraparticle mechanisms are relevant (cf. also the discussion reported in Inglezakis et al) 47. 3.5.…”

supporting

confidence: 62%

Section: Materials and Methodsmentioning

confidence: 99%

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Experimental and Modeling Studies of Sr²⁺ and Cs⁺ Sorption on Cryogels and Comparison to Commercial Adsorbents

Baimenov

Montagnaro

Inglezakis

et al. 2022

Ind. Eng. Chem. Res.

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“…According to the solid–liquid mass-transfer model, the mass-transfer rate is expressed by Fick’s second law ∂ q ∂ t = D normals r 2 · ∂ ∂ r ( r 2 · ∂ q ∂ r ) q t = 3 r normalp 3 · ∫ 0 r p q · r 2 normald r where q is the local concentration, t is the time, D s is the diffusion coefficient, r is the radial coordinate, q t is the concentration at time t , and r p is the radius. Based on the above analysis, the Biot (Bi) number is presented, which is a measure of the mass-transfer resistance normalB normali = k normalf · r normalp D normals · m normals where k f is the mass-transfer coefficient and m s is the ratio between solid mass and liquid volume. The ultrasound process can compress the liquid volume to increase the value of the variable m s so that the mass-transfer resistance is reduced.…”

Section: Resultsmentioning

confidence: 99%

Boosting Photocatalytic Hydrogen Evolution Reaction by the Improved Mass Flow and Energy Flow Process Based on Ultrasound Waves

Luo

Duan

et al. 2022

ACS Catal.

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Sun-driven photocatalytic hydrogen production reaction opens up possibilities for renewable energy systems. The reaction is the mass and energy conversion process between materials and the environment. Thus, the proper physical field introduction is the desired serious consideration to improve the mass flow and energy flow process. Here, we propose a piezo-enhanced photocatalytic system based on the ultrasound field to realize the adjustable built-in electric field favoring photo-induced carriers' transfer. As a proof of concept, the piezophotocatalyst is prepared through a hydrothermal method. On the basis of the photoelectric characterization and theory calculation, the dynamics of mass transfer is enhanced by the ultrasonic field's spatial compression and cavitation effect. Moreover, the surface redox reaction is accelerated because the chemical bond break−reformation process is improved under the support of the cavitation effect. Thus, an impressive hydrogen production rate of up to 13.09 mmol h −1 g −1 has been achieved with a ternary catalyst. A practical demonstration is also designed to actualize hydrogen production in the natural condition, proving the piezophotocatalytic system's practical advantages.

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“…To characterize the model behavior, the Biot number ( Bi ) expression was used and is given by Inglezakis et al 50:

true Bi = \frac{k_{normalf} R}{D_{normalp}}

…”

Section: Model Developmentmentioning

confidence: 99%

Modeling of Batch Organic Dye Adsorption Using Modified Metal‐Organic Framework‐5

et al. 2022

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Modeling and simulation of batch adsorption of the organic dye methylene blue (MB) by modified metal‐organic framework‐5 (MOF‐5) were investigated. The reported data on the adsorption of MB dye onto Wells‐Dawson acids (H6P2W18O62)‐immobilized MOF‐5 were employed. The film‐pore diffusion model was developed based on external mass transfer coefficient and pore diffusion coefficient that govern the mass transfer process in batch organic dye adsorption. Applying the estimated parameters, the MB adsorption by using modified MOF‐5 was examined to evaluate the effects of MOF‐5 modification, initial dye concentration, temperature, and the dosage of adsorbent. The adsorption capacity of modified MOF‐5 (H6P2W18O62/MOF‐5) was higher than pure MOF‐5. Besides, a lower initial MB dye concentration, higher temperature, and lower adsorbent dosage resulted in higher MB dye adsorption capacity.

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Liquid–Solid Mass Transfer in Adsorption Systems—An Overlooked Resistance?

Cited by 57 publications

References 62 publications

Experimental and Modeling Studies of Sr²⁺ and Cs⁺ Sorption on Cryogels and Comparison to Commercial Adsorbents

Experimental and Modeling Studies of Sr²⁺ and Cs⁺ Sorption on Cryogels and Comparison to Commercial Adsorbents

Boosting Photocatalytic Hydrogen Evolution Reaction by the Improved Mass Flow and Energy Flow Process Based on Ultrasound Waves

Modeling of Batch Organic Dye Adsorption Using Modified Metal‐Organic Framework‐5

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Liquid–Solid Mass Transfer in Adsorption Systems—An Overlooked Resistance?

Cited by 57 publications

References 62 publications

Experimental and Modeling Studies of Sr2+ and Cs+ Sorption on Cryogels and Comparison to Commercial Adsorbents

Experimental and Modeling Studies of Sr2+ and Cs+ Sorption on Cryogels and Comparison to Commercial Adsorbents

Boosting Photocatalytic Hydrogen Evolution Reaction by the Improved Mass Flow and Energy Flow Process Based on Ultrasound Waves

Modeling of Batch Organic Dye Adsorption Using Modified Metal‐Organic Framework‐5

Contact Info

Product

Resources

About

Experimental and Modeling Studies of Sr²⁺ and Cs⁺ Sorption on Cryogels and Comparison to Commercial Adsorbents

Experimental and Modeling Studies of Sr²⁺ and Cs⁺ Sorption on Cryogels and Comparison to Commercial Adsorbents