Porous Clay Heterostructure with Alginate Encapsulation for Toluene Removal

Son, Yeongkyun; Kim, Tae Hyun; Kim, Daekeun; Hwang, Yuhoon

doi:10.3390/nano11020388

Cited by 5 publications

(7 citation statements)

References 67 publications

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“…At higher BO ratios, the Alg was inadequate to establish a stable structure once it reacted with the calcium ions in the bath. Similar results have been observed for halloysite–alginate and organoclay–alginate nanocomposites [ 33 , 34 ]. The sphericity of grains of the filtration bed applied for water treatment was considered an important parameter for column design as it affects the bed porosity.…”

Section: Resultssupporting

confidence: 88%

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Granulation of Bismuth Oxide by Alginate for Efficient Removal of Iodide in Water

Kim

Seo²,

Seon³

et al. 2022

IJMS

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The granulation of bismuth oxide (BO) by alginate (Alg) and the iodide adsorption efficacy of Alg–BO for different initial iodide concentrations and contact time values were examined. The optimal conditions for Alg–BO granulation were identified by controlling the weight ratio between Alg and BO. According to the batch iodide adsorption experiment, the Alg:BO weight ratio of 1:20 was appropriate, as it yielded a uniform spherical shape. According to iodide adsorption isotherm experiments and isotherm model fitting, the maximum sorption capacity (qm) was calculated to be 111.8 mg/g based on the Langmuir isotherm, and this value did not plateau even at an initial iodide concentration of 1000 mg/L. Furthermore, iodide adsorption by Alg–BO occurred as monolayer adsorption by the chemical interaction and precipitation between bismuth and iodide, followed by physical multilayer adsorption at a very high concentration of iodide in solution. The iodide adsorption over time was fitted using the intraparticle diffusion model. The results indicated that iodide adsorption was proceeded by boundary layer diffusion during 480 min and reached the plateau from 1440 min to 5760 min by intraparticle diffusion. According to the images obtained using cross-section scanning electron microscopy assisted by energy-dispersive spectroscopy, the adsorbed iodide interacted with the BO in Alg–BO through Bi–O–I complexation. This research shows that Alg–BO is a promising iodide adsorbent owing to its high adsorption capacity, stability, convenience, and ability to prevent secondary pollution.

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Section: Resultssupporting

confidence: 88%

“…Spherical Alg granules are convenient to use as adsorbents in practical applications. They can help avoid secondary pollution resulting from dissolution, as reported in several articles with various powder adsorbents, such as iron oxide, clay, and activated carbon [ 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Granulation of Bismuth Oxide by Alginate for Efficient Removal of Iodide in Water

Kim

Seo²,

Seon³

et al. 2022

IJMS

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“…After calcination at 550 °C of the Al-PCH and Zr-PCH precursors, the PXRD patter indicated a reduction of the basal spacing to 3.80 and 3.84 nm, respectively (Figure 2). Th fact resulted from the combustion of the organic moieties and to the formation and t condensation of three-dimensional silica species, as reported for PCH materials prepar using conventional methods [48,49]. After calcination at 550 • C of the Al-PCH and Zr-PCH precursors, the PXRD patterns indicated a reduction of the basal spacing to 3.80 and 3.84 nm, respectively (Figure 2).…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 63%

“…After calcination at 550 °C of the Al-PCH and Zr-PCH precursors, the PXRD patterns indicated a reduction of the basal spacing to 3.80 and 3.84 nm, respectively ( Figure 2 ). This fact resulted from the combustion of the organic moieties and to the formation and the condensation of three-dimensional silica species, as reported for PCH materials prepared using conventional methods [ 48 , 49 ].…”

Section: Resultsmentioning

confidence: 83%

Al and Zr Porous Clay Heterostructures as Removal Agents of Basic Blue-41 Dye from an Artificially Polluted Solution: Regeneration Properties and Batch Design

et al. 2021

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The removal of Basic Blue-41 dye molecules was carried out by using two doped porous clay heterostructures by aluminum (Al) or zirconium (Zr) species. The proposed method of synthesis showed its efficiency, starting from Al or Zr intercalated hydrolyzed species, prior to its reaction with dodecylamine (C12 amine) and tetraethyl orthosilicate (TEOS) as a silica source. The intercalated precursors and their porous clay heterostructures (PCH) derivatives were characterized by different techniques. Solid NMR technique proved the presence of Al species into the intercalated silica between the clay sheets, and in addition to Si in different environments within the PCH materials. The Zr-PCH material exhibited a higher surface area and pore volume compared to its Al-PCH counterpart, with a mesoporous character for both materials. A maximum removed amount of 279 and 332 mg/g was achieved and deduced from the Langmuir equation. The regeneration tests revealed that the removal efficiency of Zr-PCH was retained after five regeneration runs, with a loss of 15% of the original value; meanwhile, the Al-PCH lost 45% of its efficiency after only three cycles. A single-stage batch design was proposed based on the Langmuir isotherm parameters. The increase of the removal capacity of Zr-PCH led to the reduction of the required amounts for the target removal of BB-41 dye compared to Al-PCH.

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“…Recently, hybrid beads based on PCHs and Na-Alg were synthesized and tested as adsorbents for volatile organic compounds [ 76 ].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Hosts Based on Sodium Alginate and Porous Clay Heterostructures for Drug Encapsulation

et al. 2021

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In this study, some hybrid materials based on sodium alginate (NaAlg) and porous clay heterostructures (PCHs) were investigated as new hosts for 5-Fluorouracil (5-FU) encapsulation. The hybrid hosts were prepared by ionotropic gelation technique using different concentrations of PCHs (1, 3, and 10 wt%) in order to identify the optimal parameters for encapsulation and drug release. The obtained hybrid materials were characterized using FTIR Spectrometry, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and UV-Vis spectrometry to investigate the interactions of the raw materials involved in the preparation of hybrid hosts, the influence of PCHs concentrations on drug encapsulation efficiency and drug release profile. All the results show that the synthesized hybrid materials were able to load a high amount of 5-FU, the encapsulation efficiency and the release profile being influenced by the concentrations of PCHs.

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Porous Clay Heterostructure with Alginate Encapsulation for Toluene Removal

Cited by 5 publications

References 67 publications

Granulation of Bismuth Oxide by Alginate for Efficient Removal of Iodide in Water

Granulation of Bismuth Oxide by Alginate for Efficient Removal of Iodide in Water

Al and Zr Porous Clay Heterostructures as Removal Agents of Basic Blue-41 Dye from an Artificially Polluted Solution: Regeneration Properties and Batch Design

Hybrid Hosts Based on Sodium Alginate and Porous Clay Heterostructures for Drug Encapsulation

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