Recovery of Filtered Graphene Oxide Residue Using Elastic Gel Packed in a Column by Cross Flow

Takaoka, Yuji; Miyoshi, Manoka; Sakaguchi, Kôichi; Morisada, Shintaro; Ohto, Keisuke; Kawakita, Hidetaka

doi:10.3390/pr6050043

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…The lower domain in the gel feels more forces, resulting in the more deformation of the gel, forming the narrower pore among the gels. So far, colloidal particle separation using the dynamic elastic behavior of the gel layer packed in column has been proposed (Takaoka et al, 2017;Takaoka et al, 2018;Takaoka et al, 2019). The elastic gel feels more force by the fluid flow, as a result, forming the compacted structure.…”

Section: Introductionmentioning

confidence: 99%

Separation of Colloidal Particle Using Elastic-Gel-Packed Column

et al. 2021

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Polymerized spherical gel (46 μm) was packed in a column to permeate silica particle suspension for the separation due to their differences of sizes. The elastic gel in the bottom domain of column deformed more because the pressure of the fluid flow suppressed the packed gel layer, that is, the formed gaps among the gels at the bottom domain had the smaller ‘pore’, resulting in filtering the smaller-size of the particles at the bottom of the column. The larger the size of silica particle, the upper the filtered domain in the column. To elute the filtered silica particle, the gel layer was compacted and restored by on-off of the fluid flow, to open the gaps in the gel layer repeatedly, demonstrating that the elution percentage of silica particle was gradually increased by the repeated on-off permeation of water.

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Section: Introductionmentioning

confidence: 99%

Separation of Colloidal Particle Using Elastic-Gel-Packed Column

et al. 2021

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“…The dynamic filtering efficiency of silica particles with a diameter of 1 µm depended on the gel size, gel elasticity, and flow rate of water. It may be possible to recover a filtered colloid at the top of the gel layer by floating the filtered colloid particles using the elasticity of the gel layer and then applying a cross flow across the column [7]. However, an appropriate technique to recover the filtered colloid particles in a gel layer has not been proposed yet.…”

Section: Introductionmentioning

confidence: 99%

Size Separation of Silica Particles Using a Magnetite-Containing Gel-Packed Column

et al. 2019

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A magnetite-containing gel was prepared by water-in-oil radical polymerization of N,N-dimethylacrylamide and N,N’-methylenebisacrylamide in the presence of magnetite. The size of the prepared gel particles was 86 µm. The obtained magnetite-containing gel was packed in a column and first permeated with water, which revealed that the gel displayed a nonlinear response to pressure drop with increasing flow rate. Thus, the gel particles at the bottom of the column felt more pressure from the fluid than those at the top, causing greater deformation of the gel particles at the bottom of the column than at the top. The gaps between the packed gel particles functioned as pores to filter particles of appropriate size and morphology. An industrial silica particle suspension with particle sizes of 300 nm, 800 nm, and 10 µm was permeated through the gel layer. The smallest (300 nm) silica particles passed through the column. The filtered silica particles were recovered from the gel layer by using a magnet to separate the magnetite-containing gel from the filtered silica particles. This magnetite-containing gel has wide application prospects for the separation of not only ceramics but also other colloids.

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“…In another work, Song et al [9] investigated the effect of porous ceramic substrate in the formation of porous carbon membranes for desalination application. Gel packed columns were also studied by Takaoka et al [10] for filtering graphene oxide and by Miyoshi et al [11] for filtering silica particles. These works report the fundamental relations between materials, structures and performance in terms of fluxes and selectivities.…”

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confidence: 99%