RSC Advances
·
2015
·Vol. 5
·期 66
·53441-53447
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IF 3.84
Jia Ma,Yunlong Ning,Cairong Gong,Gang Xue,Guoliang Fan
Three-dimensionally ordered macroporous (3DOM) SiOC was successfully fabricated on a cordierite monolith inner wall of a polystyrene (PS) sphere template through a colloidal crystal templating (CCT) method (named as 3DOM SiOC/cordierite). And perovskite-type LaCoO3 (LCO) mixed metal oxides, prepared by a facile sol–gel process, were coated onto the wall of the 3DOM SiOC/cordierite by a simple impregnation-sintering approach (named as LCO/3DOM SiOC/cordierite). The morphological and physicochemical properties studies indicate that the 3DOM structure has excellent connectivity, a large specific surface area, and applicable pore size. And the 3DOM structure plays an important role in preventing aggregation of the targeted catalyst particles, improving the contact condition between catalysts and soot as well as enhancing the reducibility of the LCO. The subsequent investigation on the catalytic performance of the 3DOM samples for diesel soot combustion shows that the 3DOM texture offers the catalyst a lower soot combustion temperature than a conventional catalyst, and the LCO/3DOM SiOC/cordierite reduces the combustion temperature even further while avoiding the rise of back-pressure effectively as well.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 6
·778
·
IF 2.67
Shunhong Dong,Juan Wu,Lanlan Huang,Hong-En Wang
Narrowing the band gap and increasing the photodegradation efficiency of TiO2-based photocatalysts are very important for their wide application in environment-related fields such as photocatalytic degradation of toxic pollutants in wastewater. Herein, a three-dimensionally ordered macroporous Pt-loaded TiO2photocatalyst (3DOM Pt/TiO2) has been successfully synthesized using a facile colloidal crystal-template method. The resultant composite combines several morphological/structural advantages, including uniform 3D ordered macroporous skeletons, high crystallinity, large porosity and an internal electric field formed at Pt/TiO2interfaces. These unique features enable the 3DOM Pt/TiO2to possess a large surface for photocatalytic reactions and fast diffusion for mass transfer of reactants as well as efficient suppression of recombination for photogenerated electron-hole pairs in TiO2. Thus, the 3DOM Pt/TiO2exhibits significantly enhanced photocatalytic activity. Typically, 88% of RhB can be degraded over the 3DOM Pt/TiO2photocatalyst under visible light irradiation (λ ≥ 420 nm) within 100 min, much higher than that of the commercial TiO2nanoparticles (only 37%). The underlying mechanism for the enhanced photocatalytic activity of 3DOM Pt/TiO2has been further analyzed based on energy band theory and ascribed to the formation of Schottky-type Pt/TiO2junctions. The proposed method herein can provide new references for further improving the photocatalytic efficiency of other photocatalysts via rational structural/morphological engineering.Keywords:3D ordered macropores;TiO2;Pt loading;photocatalysis;Schottky junction
研究领域:
环境科学
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材料科学
·
化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yue Chang,Ying Xuan,Huiying Quan,Hang Zhang,Shuangxi Liu,Zhengcao Li,Kai Yu,Jiangli Cao
As one of the most promising photocatalysts for hydrogen production from water splitting, conventional TiO 2 materials suffer from the low quantum yield and light absorption efficiency. The present study provided a strategy to improve efficiency of TiO 2 -based photocatalysts for hydrogen production from water splitting based on an interesting structure-property relationship. The hydrogen treated Au/TiO 2 photocatalysts with three-dimensionally ordered macroporous (3DOM) structure were successfully synthesized and well characterized through various methods. The 3DOM-structure and Au modification can promote the hydrogenation of TiO 2 . The light absorption can be improved by slow photon effect of the 3DOM structure. And, in the meanwhile, the hydrogenation as well as Au modification can improve the photogenerated carrier separation. In addition, to understand how hydrogenation and Au modification promote electron migration and decrease carrier recombination, the electric band structure for hydrogen treated Au/3DOM-TiO 2 was well studied and we found the local electron field enhancement, surface band bending and the generation of mid-gap state contributed most of enhancement.
研究领域:
材料科学
·
能源化学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Wenliang Liu,Su Chang,Dong Liu,Fushan Wen
Three-dimensional ordered macroporous (3DOM) materials have been widely concerned due to the unique structure. Herein, pure TiO 2 , pristine g-C 3 N 4 , 3D-Ti (TiO 2 with 3DOM structure) and 3D-xCN/Ti (x = 25 and 35 wt %) (3DOM materials with a certain ratio of TiO 2 and g-C 3 N 4 as the pore walls) were prepared. The morphologies of the samples were characterized by SEM, TEM and HRTEM, and the physical and chemical properties of the samples were explored by FT-IR, XPS, BET and UV–vis DRS. The 3D-25CN/Ti, with the structure of 3DOM and the couple of g-C 3 N 4 and TiO 2 , extended the light spectral responsive range, and exhibited an excellent hydrogen evolution rate (14.1 mmol g −1 h -1 ) , which was 28 times that of pure TiO 2 (0.55 mmol g −1 h -1 ) under simulated sunlight. The high hydrogen evolution rate is attributed to the synergistic effect of the great separation and transfer capability of charge carriers and the larger specific area, which originate from the g-C 3 N 4 /TiO 2 heterojunction and the 3DOM structure, respectively. The effective separation of the carriers was further confirmed through the photoluminescent spectroscopies and a series of photoelectrochemical experiments: Tafel, transient photocurrent response, electrochemical impedance. Finally, the mechanism of the photocatalytic hydrogen evolution was briefly discussed. These investigations reveal an important new strategy for improving the efficiency of photocatalytic hydrogen evolution.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2018
·Vol. 644
·期 18
·1072-1077
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IF 1.179
Kai Huang,Zhenyu Cai
This work presents the characterization and preparation of three-dimensionally ordered macroporous TiO 2 and TiO 2 /WO 3 composite nanoparticles with enhanced visible-light-responsive properties for rhodamine B (Rh B) photodegradation. The 3DOM TiO 2 and TiO 2 /WO 3 composites were prepared through a dip-infiltrating sol-gel process using a polystyrene (PS) colloidal crystal template. The materials were characterized by SEM, TEM, XRD, BET, XPS and UV/Vis. The 3DOM TiO 2 /WO 3 composite structures ranged from well-defined 3DOM structures, which are highly ordered and interconnected via small pore windows, to collapsed three-dimensional structures as the WO 3 content increased. The photoresponse range and specific surface area of the composite increased with less than 0.025 g of WCl 6 . The 3DOM TiO 2 /WO 3 composite with less than 0.025 g of WCl 6 exhibited a higher catalytic activity than 3DOM TiO 2 for the photocatalytic degradation of Rh B under simulated sunlight illumination.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Desheng Yang,Chaofei Bai,Fengdan Zhu,Chang Liu,Cheng Zhao Tu,Guoping Li,Yunjun Luo,Tianfu Zhang
Designing highly active catalysts and constructing the interface between ammonium perchlorate (AP) and catalysts are effective strategies for achieving efficient thermal decomposition of AP, which is an urgent need for developing AP based composite solid propellants. Herein, we report an impregnation vacuum freeze-drying strategy to encapsulate AP in an independent three-dimensionally ordered macroporous (3DOM) CoFe 2 O 4 (3D CFO) spinel, resulting in a novel 3D CFO encapsulated AP nanocomposite materials (AP-3DCNCs). The connected pores of 3D CFO provide a model structure for the growth of AP nanocrystals, while the impregnation vacuum freeze-drying strategy ensures the uniform distribution of AP crystals in pores, effectively achieving the size effect of AP nanocrystals (39.88 ∼ 55.50 nm). By adjusting the loading capacity of the AP, the AP-3DCNCs configuration was effectively controlled. The thermal decomposition of AP-3DCNCs is greatly enhanced due to their unique configuration. The high-temperature decomposition temperature is significantly reduced by 180.06–141.78 °C, and the maximum equivalent heat release increased by 2.03 times. It can be foreseen AP-3DCNCs are attractive nanocomposites for the thermal decomposition of AP, and these results provide a convenient strategy for the preparation of transition metal-based composite catalysts with promising applications in the field of solid propellants.
研究领域:
材料科学
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推进剂领域
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DOI
高影响因子
Industrial Chemistry & Materials
·
2022
·Vol. 1
·期 1
·106-116
·
IF 0
Wen Yao,Chenghong Hu,Yajie Zhang,Hao Li,Fengliang Wang,Kui Shen,Liyu Chen,Yingwei Li
Nitrogen-rich zeolitic imidazolate frameworks (ZIFs) are ideal precursors for the synthesis of metal single atoms anchored on N-doped carbon. However, the microporous structures of conventional ZIFs lead to low mass transfer efficiency and low metal utilization of their derivatives. Here, we construct a composite of Co single atoms anchored on nitrogen-doped carbon with a three-dimensional ordered macroporous structure (Co-SA/3DOM-NC) by two-step pyrolysis of ordered macro/microporous ZnCo-ZIF. Co-SA/3DOM-NC shows high activity in the oxidative esterification of furfural, achieving a 99% yield of methyl 2-furoate under mild reaction conditions, which is significantly superior to the microporous and the Co-nanoparticle counterparts. The high activity of Co-SA/3DOM-NC should be attributed to the CoN4 centers with high intrinsic activity and the ordered macroporous structure, promoting the mass transfer of reactants and accessibility of active sites.
Keywords: Heterogeneous catalysis; Hierarchical pores; Ordered macropore; Oxidative esterification reaction; Single-atom catalysts.
研究领域:
化学工程
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材料科学
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DOI
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 8
·10951-10962
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IF 2.478
Zhang Yakang,Liang Xuan,Jiang Mengting,Liang Qian,Xu Song,Yao Chao,Zhou Man,Li Zhongyu
Based on the three-dimensional ordered macroporous titanium dioxide (3DOM-TiO 2 ), a series of gold-embedded 3DOM-TiO 2 ( n Au@3DOM-TiO 2 ) with controlled Au loading amount ( n = 0.24, 1.2, 2.4, 4.8, 12, and 24 wt%) was successfully fabricated via in-situ pyrolysis for the first time. Compared with the surface-modified Au/3DOM-TiO 2 by traditional impregnation–reduction route, this body-doped Au@3DOM-TiO 2 structure exhibited smaller particle size and better dispersive property which are important for photocatalysis. Therefore, the photocatalytic activities of n Au@3DOM-TiO 2 have been tested and the optimized photocatalyst of 4.8Au@3DOM-TiO 2 was identified. A possible mechanism of Au@3DOM-TiO 2 for the enhanced photoactivity was well discussed. The present work demonstrated a unique “gold-embedded” interface with potential advantages of highly dispersed, anti-aggregation, easy recovery, and enhanced catalytic performance, and that this approach could provide an ideal platform for the further design of noble metal-doped semiconductors.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 5
·3036-3043
·
IF 11.301
Yating Wang,Chaosheng Peng,Tao Jiang,Jing Zhang,Zheng Jiang,Xingang Li
To improve solar light harvesting and charge separation efficiency, we develop a facile strategy for synthesizing defect-engineered three-dimensionally ordered macroporous (3DOM) WO3 photonic crystals via the colloidal crystal template method and subsequent H2/N2 atmosphere thermal treatment. The oxygen evolution rate of the obtained defect-engineered 3DOM WO3 (W270–400) is 40.1 μmol h−1, which is much higher than that of the untreated 3DOM WO3 and the defect-engineered WO3 nanoparticles. The enhanced performance is due to the good light harvesting and excellent charge transportion properties. The results show that the slow photon effect and bulk oxygen vacancy (VO) induced narrowed band gap greatly improve the light harvesting efficiency, while abundant surface VO can lower the valence band to increase the driving force for water oxidation, and thus significantly promote electron–hole separation. Our work can guide further design and preparation of high-efficiency defect-engineered 3DOM semiconductors for solar energy conversion.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
NANO
·
2017
·
IF 1.025
Xiuhua Li,Jian Lin,Junhong Zhao
A novel composite nanostructure which is made up of TiO 2 three dimensionally ordered macroporous (3DOM) nanostructure and TiO 2 nanorods (NRs) has been successfully synthesized through a combination of colloidal crystal template technology and hydrothermal method, then we achieved its combination with Ag nanoparticles (NPs) via a silver mirror reaction. We studied the SERS (Surface-Enhanced Raman Scattering) performance of the obtained structure, the results show that our samples are very sensitive substrates when being used to detect dye R6G molecules, with a low detection concentration of 10 − 1 1 M. This proves that it is a promising material in the area of analyzing and molecule-level detecting as a kind of novel and low-cost SERS substrate.
研究领域:
材料科学
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纳米技术
·
光谱学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Qiuchan Li,Yang Zhang,Yubin Zeng,Mingyue Ding
Photocatalytic H 2 evolution is a promising technology which could be instrumental in producing clean hydrogen energy. In regard to the photocatalyst, its band structure, morphology and light utilization have a significant influence on the H 2 evolution rate and stability. Herein, a three-dimensional ordered macroporous nitrogen-vacancy carbon nitride (3DOM V-CN) photocatalyst was developed by combining vacancies with 3DOM structure for visible-light photocatalytic H 2 evolution. This strategy preserved the structural properties of 3DOM to improve the light utilization and the specific surface area of the photocatalysts. Moreover, constructing suitable vacancies could trap electrons to facilitate the separation of photogenerated carriers, and extend the light absorption region of the photocatalysts by adjusting band structure, thus improving photocatalytic activity. Compared with CN (0.3 mmol h −1 g −1 ), 3DOM V-CN demonstrated a superior photocatalytic H 2 evolution rate of 2.3 mmol h −1 g −1 (λ ≥ 420 nm) while possessing excellent stability. This work provides an effective and low-cost strategy for the design of the photocatalysts with high activity and stability by simultaneously tuning the band structure and morphology.
研究领域:
材料科学
·
能源科学
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DOI
PubMed
高影响因子
ChemCatChem
·
2025
·
IF 3.9
Yingshan Xue,Ping Wang,Cheng Yang,Jiasai Yao,Tianbao Zhang,Xin Zhang,Jing Xiong,Xiaohua Sun,Yuechang Wei,Zhenxing Li
Nitrogen oxides are an industrial and domestic waste gas, which pollutes the air and affects health. In this paper, we use the template method to achieve the doping of alkaline earth metals, and the alkaline earth metals are doped into cerium-manganese-based three-dimensional ordered macroporous (3DOM) catalysts to detect NO oxidation. The introduction of alkaline earth metals can improve the stability and thickness of macroporous results, which increases the contact area between the catalyst and reactant gases. At the same time, alkaline earth metal doping can promote the formation of more oxygen vacancies and unsaturated structures, and improve the catalytic activity of NO oxidation. The NO conversion rate of CM-3Mg doped with 3% Mg was 61.25% at 250°C, and the NO conversion rate was the highest at 303°C, which was 79.2%. This study provides a promising catalyst candidate for NO oxidation in practical applications.
研究领域:
环境科学
·
催化化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）