A hierarchically porous diatomite/silicalite-1 composite for benzene adsorption/desorption fabricated via a facile pre-modification in situ synthesis route

Yuan, Weiwei; Yuan, Peng; Liu, Dong; Deng, Liangliang; Zhou, Junming; Yu, Wenbin; Chen, Fanrong

doi:10.1016/j.cej.2016.02.099

Cited by 49 publications

(37 citation statements)

References 59 publications

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“…The considerable porous parameters of the composite were attributed to the nano-sized S-1 coated onto Dt. In addition, the wt% of zeolite in the composites was calculated using Equation (2) [21]:Wzeolite%=[Vmicropore(composite)−Vmicropore(Dt)]/Vmicropore(S−1)×100%…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Diatomite/Silicalite-1 Composites and Their Property for VOCs Adsorption

Liu

Tian

2019

Materials

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Adsorption technology is an effective method to remove volatile organic compounds (VOCs). In this work, we prepared hierarchical porous materials using modified diatomite (Dt) as a support and nano-sized silicalite-1 (S-1) seeds as inorganic fillers, which were applied to adsorb volatile organic compounds (VOCs). The characterization of the composites indicated that S-1 was successfully coated onto the surface of modified Dt, and the best surface area of the composites was 398.8 m2/g, nearly 40 times as large as Dt. The adsorption capacities of Dt/S-1 composites for three probe VOCs (ethyl acetate, acetone, and toluene) were rather superior to Dt, and the composites had preferential adsorption selectivity for ethyl acetate. Effects of seeded zeolite contents and hydrothermal conditions for the adsorption capacity of composites were discussed in this paper. The composite seeded with 5 wt% S-1 zeolite, which was subsequently synthesized by hydrothermal reaction at 100 °C for four days, showed the maximum adsorption capacity (1.31 mmol/g for ethyl acetate). The pseudo second-order model provided a perfect fit to adsorption kinetics, while the Langmuir model agreed the best with the adsorption isotherms. In addition, the composites had selective adsorption to ethyl acetate among these three probes VOCs. The regeneration experiments were also carried out, and the adsorption efficiency of the adsorbents was still up to 67% after five adsorption–desorption cycles. The hierarchical porous Dt/S-1 composites have an excellent VOC adsorption performance, satisfactory selectivity, and recycling ability.

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Section: Resultsmentioning

confidence: 99%

Fabrication of Diatomite/Silicalite-1 Composites and Their Property for VOCs Adsorption

Liu

Tian

2019

Materials

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“…prepared a diatomite/silicalite‐1 (Sil‐1 nano) composite possessing a multistage porous structure, containing micropores and mesopores (formation from the stacking voids of the smaller silicalite‐1 nanoparticles), while retaining the macropores in the diatomite support. The material showed larger static and dynamic adsorption capacities of C 6 H 6 . Huet al.…”

Section: Materials For Hcho and C6h6 Storagementioning

confidence: 99%

“…Dynamic method using fixed bed unit; flow rate 100 ml/min; sample weight is 0.1 g 0.13 [42] Modified SBA-15 1000 293 Dynamic method: flow rates 50 ml/min; sample weight is 0.1 g 0.65 [44] Diatomite/silicalite-1 -298 Dynamic method using adsorption reaction bed; flow rates 3 ml/min 3.15 [43] ratios and TS-1 zeolite under gas mixture containing C 6 H 6 (14 ppm) and water vapor (RH = 50 %, RT) were compared. The results indicated that the benzene storage capacity improved with increase of the Si/Al ratio of HZSM-5 from 25 to 200, while TS-1 showed the highest benzene storage capacity (0.072 mmol/gcat ) in humid conditions due to its well-developed hydrophobic properties.…”

Section: Benzene Storage On Zeolitesmentioning

confidence: 99%

“…The material showed larger static and dynamic adsorption capacities of C 6 H 6 . [43] Huet al synthesized organofunctionalized SBA-15 materials by a co-condensation method and used them as adsorbents for benzene abatement. Results indicated that a modified phenyl-SBA-15 with a PTES/ TEOS (phenyltriethoxysilane/tetraethyl orthosilicate) molar ratio of 1 : 10 had the highest benzene adsorption capacity, which was ascribed to π-interactions between the benzene and the phenyl groups on the SBA-15 surface.…”

Section: Benzene Storage On Zeolitesmentioning

confidence: 99%

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Catalytic Materials for Low Concentration VOCs Removal through “Storage‐Regeneration” Cycling

Chen

et al. 2019

ChemCatChem

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Compared with other approaches for the removal of VOCs, the concept of “storage‐regeneration” cycling is proposed as an effective and promising way to eliminate low‐concentration indoor VOCs. A key issue in this approach is the design of catalytic materials which should possess balanced properties between storage and regeneration. The materials used for the storage of VOCs such as formaldehyde and benzene should not only possess high and selective VOC storage capacity, but also be easily regenerated without any release of the VOCs or generation of secondary pollutants. To this end, appropriate regeneration methods have been proposed, including thermal regeneration, plasma (nonthermal plasma) oxidation or ozone enabled regeneration. In this short review, these essential features of the cycled “storage‐regeneration” concept for VOC destruction are considered and the prospects for the implementation of this technology are assessed.

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“…Zeolites have been formed from wastes [ 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ], natural sources such as clay minerals [ 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ] or by adding zeolite seeds in starting gel with or without organic templates [ 55 , 56 , 57 , 58 ]. Recently, natural cost-effective and green silica precursors such as diatomite and obsidian were also used [ 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 ]. Both materials are interesting natural precursors due to their relatively low cost and highly reactivity although the formation of zeolite type strongly depends on the elemental composition of these natural sources as well as on the used process.…”

Section: Introductionmentioning

confidence: 99%

Obsidian as a Raw Material for Eco-Friendly Synthesis of Magnetic Zeolites

et al. 2020

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A sample of rhyolitic obsidian (OS) was used as raw material for zeolite synthesis by long (4 days) and fast (2 h)-aging hydrothermal processes. Zeolite synthesis was also performed by a fast (2 h) sonication method. The products were analysed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) both immediately after and 3 years after their formation in order to determine the stability of synthetic materials according to the method used. The results confirm zeolitization of obsidian both by long-aging conventional hydrothermal heating and fast hydrothermal process. However, the data highlight the efficiency of direct ultrasound energy in achieving more stable zeolite crystals over time. These results carried out using a natural source, follow those already obtained using wastes and pure sources as raw materials thus providing a definitive validation of the different mechanisms controlling zeolite formation according to the process used. Moreover, the results confirm the effectiveness of ultrasonic energy in the formation of zeolites that are more stable over time. Due to the chemical composition of the obsidian precursor, all synthetic zeolites show good magnetic properties (i.e., saturation magnetization), in view to potential magnetic separation.

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A hierarchically porous diatomite/silicalite-1 composite for benzene adsorption/desorption fabricated via a facile pre-modification in situ synthesis route

Cited by 49 publications

References 59 publications

Fabrication of Diatomite/Silicalite-1 Composites and Their Property for VOCs Adsorption

Fabrication of Diatomite/Silicalite-1 Composites and Their Property for VOCs Adsorption

Catalytic Materials for Low Concentration VOCs Removal through “Storage‐Regeneration” Cycling

Obsidian as a Raw Material for Eco-Friendly Synthesis of Magnetic Zeolites

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