Synthesis conditions of porous clay heterostructure (PCH) optimized for volatile organic compounds (VOC) adsorption

Yang, Philje; Song, Mugeun; Kim, Daekeun; Kim, Eun Jung; Hwang, Yuhoon

doi:10.1007/s11814-019-0369-9

Cited by 15 publications

(5 citation statements)

References 42 publications

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“…To investigate the morphological changes of parent bentonite, PCH, and Alg-PCH, TEM analysis was carried out ( Figure 3 and Figure S1 ). As shown in Figure S1 , parent bentonite shows a characteristic well-ordered layered structure [ 50 , 61 ]. After introducing organic moieties into the bentonite layer, the well-ordered layered structure was transformed into a disordered structure, which corresponds well with PXRD results ( Figure 1 ).…”

Section: Resultsmentioning

confidence: 99%

“…PCH based on bentonite was prepared by a modified method from our previous report [ 50 ]. For the practical application of Alg-PCH, experimental scales of Alg-PCH were set based on the 30 g of bentonite.…”

Section: Methodsmentioning

confidence: 99%

“…The toluene adsorption experiment was conducted by following our previous report [ 50 ], and a gas chromatography-flame ionization detector (GC-FID; YL6500, Youngin, South Korea) was utilized for quantification of toluene. For adsorption experiments, the designed concentration of toluene gas (1000 ppm) was produced by toluene solution.…”

Section: Methodsmentioning

confidence: 99%

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Porous Clay Heterostructure with Alginate Encapsulation for Toluene Removal

Son

Kim

et al. 2021

Nanomaterials

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A volatile organic compound adsorbent based on a porous clay heterostructure (PCH) with alginate biopolymer was successfully prepared. From N2 adsorption–desorption analysis, the specific surface area, pore volume, and pore size of bentonite were dramatically increased after introducing the porous structure. Following complexation with alginate (Alg-PCH), the pore volume and pore size were not significantly affected by pore structure. The thermal stability of Alg-PCH shows enhanced thermal stability compared to alginate and alginate beads. The morphology layered structure of Alg-PCH was carried out by transmission electron microscopy (TEM), suggesting the disorder and re-order of the c-axis layer stacking by porous structure and complexation with alginate, respectively, which was well-matched with X-ray diffraction results. To optimize the preparation of Alg-PCH, various reaction conditions (alginate, CaCl2 concentration, bead size, and weight ratio between alginate and PCH) were utilized. According to the toluene adsorption–desorption experiments, the preparation conditions for Alg-PCH were selected as a 2 mm extrusion tip, 0.5% of alginate, and 2% of CaCl2 solution with a 1:50 alginate:PCH weight ratio. Additionally, it shows 61.63 mg/g adsorption capacity with around 49% desorption efficacy under atmospheric temperature and pressure.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Porous Clay Heterostructure with Alginate Encapsulation for Toluene Removal

Son

Kim

et al. 2021

Nanomaterials

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“…The adsorption process was designed to fill adsorbents inside a cylindrical reactor made of aluminum. We prepared the adsorbent by mixing one commercial adsorbent (i.e., activated alumina) [28] and two other adsorbents (i.e., porous clay heterostructures, metal organic frameworks) produced in our laboratory [29,30]. More details on the adsorbents are presented in Table 1.…”

Section: Voc-reduction Processmentioning

confidence: 99%

Reduction of Volatile Organic Compounds (VOCs) Emissions from Laundry Dry-Cleaning by an Integrated Treatment Process of Condensation and Adsorption

et al. 2021

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Volatile organic compounds (VOCs) are intermittently emitted at high concentrations (tens of thousands of ppmv) from small-scale laundry shops in urban areas, affecting the urban atmospheric environment. In this study, we suggested integrating VOC treatment processes incorporating condensation and adsorption in series to remove VOCs released from small-scale laundry dryers (laundry weighing less than 30 kg). We designed two different processes depending on regeneration modes for adsorber beds; an open-circuit flow process and a closed-loop flow process in regeneration mode. Our VOC treatment processes enable sustainable operation via the regeneration of adsorbers on a regular basis. Before applying the VOC treatment processes, average concentration of total volatile organic compounds (TVOCs) was 4099 ppmv (12,000 ppmv of the peak concentration) during the drying operation. After applying our closed-loop flow process, TVOC concentration decreased to 58 ppmv, leading to 98.5% removal efficiency. We also verified the robustness of our process performance in a continuous operation (30 cycles) by using a process simulation program. Lastly, we observed that our integrated treatment process can contribute to reductions in ozone and secondary organic aerosol generation by 90.4% and 95.9%, respectively. We concluded that our integrated VOC treatment processes are applicable to small-scale laundry shops releasing high-concentration VOCs intermittently, and are beneficial to the atmospheric environment.

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“…Porous nanoarchitectures based on clay minerals have been a focus of growing interest in the field of materials science due to their ability to produce nanostructures with beneficial functional and structural properties (Polverejan et al , 2000; Ruiz-Hitzky & Aranda, 2014; Kooli et al , 2017). This multifunctionality supports their use in various fields, notably in environmental remediation via the removal of pollutants due to their catalytic and adsorption properties and in the medical field in terms of the development of viable and functional biodevices for biomedical applications, as supports for the controlled release of drugs and in bioimaging (Tobajas et al ., 2017; Akkari et al , 2018; Yuan et al ., 2018; Yang et al ., 2019; Dai et al , 2021; Persano et al , 2021).…”

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confidence: 99%