A large-surface-area TS-1 nanocatalyst: a combination of nanoscale particle sizes and hierarchical micro/mesoporous structures

Du, Changlin; Cui, Nan; Li, Linghao; Hua, Zile; Shi, Jianlin

doi:10.1039/c9ra00124g

Cited by 17 publications

(5 citation statements)

References 31 publications

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“…Photocatalytic ability of TS-1 could be enhanced by coupling with BiVO 4 , similar to some other semiconductor photocatalysts [24]. TS-1 has high specific surface area [25] and is very conducive to the adsorption of organic pollutants. Therefore, TS-1 is promising to be used as a photocatalyst in the field of organic wastewater treatment through combining visible-light-responsive photocatalysts to build hybrid system.…”

Section: Introductionmentioning

confidence: 73%

Photocatalytic Performance and Degradation Pathway of Rhodamine B with TS-1/C3N4 Composite under Visible Light

Yang¹,

Zhu

Peng

et al. 2020

Nanomaterials

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TS-1/C 3 N 4 composites were prepared by calcining the precursors with cooling crystallization method and were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), UV-Vis diffuse reflection spectrum (DRS) and nitrogen adsorption-desorption isotherm. The photocatalytic performance of TS-1/C 3 N 4 composites was investigated to degrade Rhodamine B (RhB) under visible light irradiation. The results showed that all composites exhibited better photocatalytic performance than pristine TS-1 and C 3 N 4 ; TS-1/C 3 N 4 -B composite (the measured mass ratio of TS-1 to C 3 N 4 is 1:4) had best performance, with a rate constant of 0.04166 min −1 , which is about two and ten times higher than those of C 3 N 4 and TS-1, respectively. We attributed the enhanced photocatalytic performance of TC-B to the optimized heterostructure formed by TS-1 and C 3 N 4 with proper proportion. From the results of photoluminescence spectra (PL) and the enhanced photocurrent, it is concluded that photogenerated electrons and holes were separated more effectively in TS-1/C 3 N 4 composites. The contribution of the three main active species for photocatalytic degradation followed a decreasing order of ·O 2 − , ·OH and h + . The degradation products of RhB were identified by liquid chromatography tandem mass spectrometry (LC-MS/MS), and the possible photocatalytic degradation pathways were proposed.

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Section: Introductionmentioning

confidence: 73%

Photocatalytic Performance and Degradation Pathway of Rhodamine B with TS-1/C3N4 Composite under Visible Light

Yang¹,

Zhu

Peng

et al. 2020

Nanomaterials

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“…This can potentially lead to the formation of substantial extra-framework Ti and even result in synthesis failure. Besides, for a comprehensive comparison of previously reported advanced TS-1 catalysts regarding H 2 O 2 -mediated 1-hexene epoxidation under similar reaction conditions, see Table S2. − TS-1-50 exhibits a typical 1-hexene conversion, as most other cases show, which is 26%. After defect healing treatment, TS-1-50-healed with a 1-hexene conversion of 44% is comparable to the “superior TS-1 catalyst” (1-hexene conversion = 55%).…”

Section: Resultsmentioning

confidence: 97%

Hydrophobicity Manipulation of Titanium Silicalite-1 with Enhanced Catalytic Performance via Liquid-Mediated Defect Healing Treatment

Li,

Iyoki,

Techasarintr

et al. 2023

ACS Catal.

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As a high-performance catalyst in the industry, titanium silicalite-1 (TS-1) has received extensive attention from researchers for decades. Using aqueous hydrogen peroxide as an oxidant, TS-1 exhibits high activity and selectivity for various oxidation reactions. However, the existence of silanol defects compromises its catalytic activity and leads to byproduct formation. In this research, we report a successful elimination of silanol defects and significant improvements in the catalytic activity of TS-1 via defect healing treatment. As confirmed by Fourier transform infrared spectroscopy (FT-IR), solid-state magic-angle spinning nuclear magnetic resonance (MAS NMR), and water vapor adsorption isotherms, defect healing-treated samples are free of silanol defects with significantly improved hydrophobicity. To evaluate the catalytic performance, epoxidation of 1-hexene with H 2 O 2 was carried out. All defect healing-treated samples exhibit highly enhanced catalytic performance. The conversions of 1-hexene are increased by up to 70% compared to the corresponding pristine samples. After defect healing treatment, the turnover frequency is as high as 159 h −1 .

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“…The lower yield of solid materials of TS-1- h in comparison with that of TS-1- d might come from significant amounts of dissolved silica and titanium species in the aqueous medium above the solid materials in the conventional hydrothermal synthesis . An increase in framework Ti and accessibility to the active sites of TS-1 zeolite are desirable to enhance the catalytic performance. , The catalytic activity of TS-1 were then evaluated toward the hydroxylation of phenol (kinetic diameter of 0.57 nm) and oxidation of DBT (kinetic diameter of 0.9 nm). The TS-1- d showed much superior catalytic performances over TS-1- h (Figure and Table S3).…”

Section: Resultsmentioning

confidence: 99%

Crystallization of as-Mesocellular Silica Foam into Hierarchical TS-1 Zeolites by Conventional Hydrothermal and Dense-Gel Routes for Oxidation Reactions

Shakeri

Zarnagh

2020

ACS Omega

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Crystallization of as-mesocellular silica foam (as-MCF) into TS-1 zeolites by conventional hydrothermal and dense-gel routes is reported. The TS-1 synthesized through the dense-gel route (TS-1-d) showed higher meso-macroporosity (0.311 vs 0.233 cm3/g), smaller particle size (130 vs 305 nm), and enhanced external surface area (86 vs 31 m2/g) than that synthesized under conventional hydrothermal conditions (TS-1-h). These might suggest that an organic template from as-MCF acted as mesoporogen in the dense-gel synthesis; however, segregation of the organic template and the synthesis mixture occurred in the conventional hydrothermal synthesis. The obtained TS-1 from the crystallization of as-MCF showed an enhanced framework Ti. The turnover frequencies (h–1) of TS-1-d toward hydroxylation of phenol and oxidation of dibenzothiophene (DBT) were 2 and 5 times, respectively, higher than those by TS-1-h. The DBT conversion by TS-1-d reached >99.0%, while it was only 63% by TS-1-h, suggesting the potential of TS-1-d for deep desulfurization of the fuels. Consequently, the crystallization of as-mesoporous materials through the dense-gel route is a promising approach to prepare TS-1 zeolites with smaller particle sizes and enhanced mesoporosity.

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A large-surface-area TS-1 nanocatalyst: a combination of nanoscale particle sizes and hierarchical micro/mesoporous structures

Abstract: By dry-gel steam-assisted crystallization and top-down alkali-etching treatment, hierarchically structured TS-1 nanozeolites with abundant micro/mesopores were synthesized for the first time, with high specific surface area of 606 m2 g−1 and total pore volume of 0.86 cm3 g−1.

Cited by 17 publications

References 31 publications

Photocatalytic Performance and Degradation Pathway of Rhodamine B with TS-1/C3N4 Composite under Visible Light

Photocatalytic Performance and Degradation Pathway of Rhodamine B with TS-1/C3N4 Composite under Visible Light

Hydrophobicity Manipulation of Titanium Silicalite-1 with Enhanced Catalytic Performance via Liquid-Mediated Defect Healing Treatment

Crystallization of as-Mesocellular Silica Foam into Hierarchical TS-1 Zeolites by Conventional Hydrothermal and Dense-Gel Routes for Oxidation Reactions

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