Polymer-oriented evaporation induced self-assembly strategy to synthesize highly crystalline mesoporous metal oxides

Xiong, Hailong; Zhou, Hongru; Qi, Chunyu; Liu, Zhilin; Zhang, Liangliang; Zhang, Ling; Qiao, Zhen‐An

doi:10.1016/j.cej.2020.125527

Cited by 25 publications

(9 citation statements)

References 38 publications

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“…Moreover, obvious lattice fringes with d-spacing values of 0.35 nm can be assigned to the (101) plane of anatase (Figure 1d). 25 The effects of the phosphotungstic acid content and PEI usage on the crystalline structure of the catalyst are investigated using the XRD patterns (Figure 1e,f). As shown in Figure 1e, the characteristic diffraction peaks of as-synthesized aHPW/TiO 2 -0.5 catalysts correspond with the typical characteristic lines of anatase TiO 2 (PDF No.…”

Section: Resultsmentioning

confidence: 99%

“…The TEM images demonstrate that the 20HPW/TiO 2 -0.5 catalyst consists of small and uniform nanoparticles with an average size of 6 nm, connected by well-defined wormlike mesopores (Figure b,c). Moreover, obvious lattice fringes with d -spacing values of 0.35 nm can be assigned to the (101) plane of anatase (Figure d) . The effects of the phosphotungstic acid content and PEI usage on the crystalline structure of the catalyst are investigated using the XRD patterns (Figure e,f).…”

Section: Resultsmentioning

confidence: 99%

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Designed Formation of Polyoxometallate-Based Mesoporous Titania Composites by a Solvent-Free Chemical Self-Assembly Method for Oxidative Desulfurization of Diesels

et al. 2021

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The construction of crystalline TiO 2 with uniform mesoporous architecture plays a key role in its catalytic performance improvement. However, the resulting porous TiO 2 composite is liable to form a disordered pore structure and have a narrow pore size and low porosity after a high-temperature-induced crystallization process, leading to a serious decrease in its catalytic efficiency. Here, a series of polyoxometalate (POM)-modified TiO 2 catalysts with a confined mesostructure have been realized by a rapid and solvent-free self-assembly strategy, oriented by polyethyleneimine (PEI) polymer. TEM and N 2 adsorption analyses demonstrate that the as-fabricated mesoporous composites possess remarkable porous properties (i.e., 260.5 m 2 g −1 and 0.3989 m 3 g −1 ). In addition, the nanomesoscopic structure of catalysts can be further tuned by varying molecular interactions between polyethyleneimine, titanium oligomers, and POMs. The as-fabricated POM-based TiO 2 catalysts provide connected and large mesochannels for reactant molecules in the inner surface and enhance the dispersity of POM species in the TiO 2 matrix, which exhibits excellent catalytic efficiency in the oxidative desulfurization reaction of dibenzothiophene at room temperature.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Designed Formation of Polyoxometallate-Based Mesoporous Titania Composites by a Solvent-Free Chemical Self-Assembly Method for Oxidative Desulfurization of Diesels

et al. 2021

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“…Several synthetic approaches have been reported for preparing mesoporous materials with various compositions, such as metals, metal oxides, metal nitrides, and carbon. 143–163 In general, the condensation and crystallization reactions of most precursors proceed in random directions to form a micrometer-scale bulk structure. Therefore, the morphological changes in most materials during the reaction are difficult to predict, thus limiting nano-scale structural control.…”

Section: Synthetic Approaches For Mesoporous Materialsmentioning

confidence: 99%

“…Early template decomposition causes structural collapse; therefore, a thermally stable template at high temperature is required for the synthesis of highly crystalline mesoporous metal oxides. 161 Lee et al introduced the combined assembly by soft and hard (CASH) method to achieve highly crystalline mesoporous metal oxides with large-sized and uniform pores without structural collapse (Fig. 5a).…”

Section: Soft-template Synthesis Of Mesoporous Materials With Various...mentioning

confidence: 99%

Recent progress in block copolymer soft-template-assisted synthesis of versatile mesoporous materials for energy storage systems

et al. 2023

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“…Obviously, the direct synthesis method is easier and faster, which usually adopts a triblock copolymer as a template, combining a phenolic resin and metal salt precursors (metal nanoparticles) in the system, and then the target product of ordered mesoporous carbon/metal oxide is directly obtained by baking the template in an inert atmosphere [32]. Amphiphilic copolymers such as PEO-b-PS, PEO-b-PMMA, PEO-b-PHB, which have high molecular weight, have recently seen wide use as templates for the synthesis of ordered mesoporous materials with different compositions [33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Mesoporous CoOx/C Nanocomposites Functionalized Electrochemical Sensor for Rapid and Continuous Detection of Nitrite

et al. 2021

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Nitrite is widespread in the environment, and is frequently used as an additive to extend the shelf life of meat products. However, the excess intake of nitrite can be harmful to human health. Hence, it is very important to know and control the content of nitrite in foodstuffs. In this work, by the means of self-assembly induced by solvent evaporation, we used the amphiphilic PEO-b-PS diblock copolymers resol and cobalt nitrate as a template to synthesize ordered mesoporous CoOx/C nanocomposites. Then, the CoOx/C nanocomposites were modified on a glassy carbon electrode (GCE), which showed excellent sensitivity, good selectivity, and a wide detection range for nitrite. Through cyclic voltammetry and current–time techniques, the electrochemical performance of the GCE modified with CoOx/C nanocomposites was analyzed. Under the optimized conditions, we found that anodic currents were linearly related to nitrite concentrations with a regression equation of lp (µA) = 0.36388 + 0.01616C (R2 = 0.9987) from 0.2 µM to 2500 µM, and the detection limit was 0.05 µM. Furthermore, the electrochemical sensor behaved with high reproducibility and anti-interference ability towards various organic and inorganic ions, such as NO3−, SO42−, Cl−, COOH− (Ac−), Na+, K+, Mg2+, and NH4+. Our results indicated that these CoOx/C nanocomposites could be applied in electrochemical sensors for the rapid and sensitive detection of the food preservative nitrite.

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Polymer-oriented evaporation induced self-assembly strategy to synthesize highly crystalline mesoporous metal oxides

Cited by 25 publications

References 38 publications

Designed Formation of Polyoxometallate-Based Mesoporous Titania Composites by a Solvent-Free Chemical Self-Assembly Method for Oxidative Desulfurization of Diesels

Designed Formation of Polyoxometallate-Based Mesoporous Titania Composites by a Solvent-Free Chemical Self-Assembly Method for Oxidative Desulfurization of Diesels

Recent progress in block copolymer soft-template-assisted synthesis of versatile mesoporous materials for energy storage systems

Mesoporous CoOx/C Nanocomposites Functionalized Electrochemical Sensor for Rapid and Continuous Detection of Nitrite

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