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
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER INTERNATIONAL
·
2021
·Vol. 70
·期 9
·1344-1355
·
IF 2.99
Zhi-Yuan Zhang,Li-Li Rui,Ya-Li Lin,Hui-Dan Zhang,Ji-Ming Ou,Jian-Feng He,Quan-Zhou Wu
Three-dimensionally ordered macroporous molecularly imprinted polymers (3DOM MIPs) were prepared for the direct purification of cinchona alkaloids from crude cinchona extract. The 3DOM MIPs were easily prepared by grafting quinine-MIPs on the pore walls of 3DOM thiol-group-functionalized silica. The materials were characterized using various techniques. The results showed that the 3DOM MIPs had a more regular macroporous structure, a greater surface area and a greater porosity than traditional bulk MIPs (TBMIPs). The 3DOM MIPs could reach a high MIP content of 69.9%. And the 3DOM structure could improve intraparticle adsorption and provide more accessible adsorption sites. Consequently, in both static adsorption experiments and solid-phase extraction (SPE), the actual adsorption capacity of the imprinted polymers of the 3DOM MIPs was about 83% higher than that of TBMIPs. Moreover, the 3DOM MIPs exhibited high affinity for quinine, quinidine and cinchonine. Using the quinine-3DOM MIPs as SPE sorbent, quinine, quinidine and cinchonine could be effectively purified from crude cinchona extract with high elution recoveries. Control experiments also showed that the 3DOM MIPs were superior to commercially available adsorbents in terms of the purification of cinchona alkaloids from crude extract. © 2021 Society of Chemical Industry
研究领域:
材料科学
·
药物化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 20
·11998-12005
·
IF 3.269
Xingzhong Guo,Pengan Yin,Wei Lei,Hui Yang
Herein, macroporous CuAl2O4 spinel monoliths derived from ionic precursors were successfully synthesized via a sol–gel route in the presence of propylene oxide (PO) and poly(ethylene oxide) (PEO). PO and PEO cooperatively control the sol–gel transition and phase separation of the system to form gels with a phase-separated macrostructure. The resultant xerogel exists in the form of a monolith and possesses interconnected macroporous channels and co-continuous dense skeletons composed of amorphous Al(OH)3 and Cu2(OH)3Cl. Heat-treatment allows the formation of the single crystalline phase CuAl2O4 spinel without the destruction of well-defined interconnected channels, and the CuAl2O4 spinel monoliths with a macropore size of 0.5–1 μm and porosity of 55–70% can be obtained after heat-treatment. In this study, three anionic dyes and two cationic dyes were selected as adsorbates to investigate the selective adsorption ability of the resultant monoliths. Results indicate that the as-prepared CuAl2O4 spinel heat-treated at 600 °C shows a high affinity and adsorption rate towards the anionic dyes congo red (∼100%) and methyl blue (∼81.8%) within 10 min except towards methyl orange (∼25.5%); thus, the abovementioned spinel can be used for the efficient and selective adsorption of certain anionic dyes from a binary cationic–anionic dye system or fast separation of methyl orange (MO) from a double anionic dye system.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2022
·
IF 4.969
Yu Li,Cuicui Li,Jianyou Zeng,Ting Zhang,Jiachen Li,Zhaoqi Guo,Zhao Qin,Jianhua Yi,Fengqi Zhao,Haixia Ma
To improve the combustion performance of solid propellants relies on efficient combustion catalyst with large specific surface area and high density of active sites. In this work, three-dimensional ordered macroporous FeCo 2 O 4 (3DOM - FeCo 2 O 4 ) with four different pore diameters was successfully prepared using polymethyl methacrylate (PMMA) colloidal crystals as a template. Differential scanning calorimetry (DSC) study shows that 3DOM - FeCo 2 O 4 with a pore diameter of 176 nm has the best catalytic performance on the thermolysis of ammonium perchlorate (AP). The decomposition peak temperature and apparent activation energy were reduced by 116.5 ℃ and 26.1 kJ/mol, respectively. Thermogravimetry/mass spectrometry (TG/MS) was used to analyze the catalytic mechanism. The result indicates that 3DOM-FeCo 2 O 4 can accelerate the electron transfer from ClO 4 – to NH 4 + to form HClO 4 and NH 3 and the transformation from O 2 to superoxide ion(O 2 – ), thus providing active sites for intermediate products of AP and catalyzing the decomposition of AP. Furthermore, the heat release and ignition tests of thermites using 3DOM-FeCo 2 O 4 as the oxidant were carried out. The thermite with a pore diameter of 215 nm exhibits higher heat release and better ignition characteristic compared to the thermites with other pore diameters.
研究领域:
材料科学
·
燃烧化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Mengqi Bian,Rui Liu,Qinghai Zhang,Yunlong Qu,Guanghui Chen,Jihai Duan,Hui Zhao,Weiwen Wang
The one-step preparation of methacrylic acid from isobutylene presents a significant challenge. In this study, three-dimensionally ordered macroporous (3DOM) Mo-V-P-Ce was synthesized using the hard template method and employed as a carrier for heteropolyacids in the selective oxidation of isobutene (IBN) to produce methacrylic acid (MAA). The CuNH 4 PAV@3DOM Mo-V-P-Ce catalyst developed through this method exhibits an ordered macroporous structure, which significantly enhances its thermal stability. Additionally, it contains a significant number of active species (VO 2 + ) and appropriate moderately strong acidic centers, which collectively improve the overall performance of the catalyst. The combination of CuNH 4 PAV with the 3DOM structure increases the surface concentration of oxygen vacancy species, thereby promoting the catalytic activity of the composite catalyst in converting these oxygen vacancy species into lattice oxygen species. Notably, the selectivity of the synthesized heteropolyacid catalysts for MAA increased to 84 % after loading. This work offers a novel approach to the development of efficient catalysts.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Cuiling Liang,Zhiyuan Zhang,Huidan Zhang,Lifang Ye,Jianfeng He,Jiming Ou,Quanzhou Wu
In this work, to improve the availability of the recognition sites of molecularly imprinted polymers (MIPs), ordered macroporous molecularly imprinted polymers (OMMIPs) were facilely prepared by grafting a quercetin-MIPs layer on the pore walls of the ordered macroporous thiol group functionalized silica. The pore structures were characterized by FTIR, Raman, SEM, BET and TGA measurements. The results indicated that OMMIPs possessed a nanoscale polymer layer, a more regular macroporous structure and a greater porosity compared with the traditional bulk MIPs (TBMIPs). The polymer content of OMMIPs was about 49.7%. Kinetic and isothermal adsorption experiments indicated that OMMIPs exhibited higher affinity and selectivity towards quercetin than its structural analogues. Moreover, OMMIPs could improve the intra-particle adsorption and thus provide a significant improvement in recognition sites availability over TBMIPs. Using the quercetin-OMMIPs as SPE sorbent, quercetin was directly extracted from the crude Gingko leaves extract with a satisfying selectivity and elution recovery.
研究领域:
分析化学
·
材料科学
·
植物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 27
·47716
·
IF 2.188
Fenghao Guo,Yinping Wang,Xilu Chen,Mingqian Chen,Wei He,Zhiyong Chen
Cryogels are supermacroporous but restricted by lack of surface area in utilization to date. We here propose a method for fabrication of supermacroporous polydivinylbenzene (PDVB) cryogels with high surface area by redox-initiated cryopolymerization combined with solvothermal postcrosslinking technique. The PDVB precursor cryogels are prepared by redox-initiated cryopolymerization, followed by postcrosslinking of residual double bonds to form hypercrosslinked cryogels under solvothermal conditions. The hypercrosslinked cryogels maintain the original supermacroporosity and display very high surface area up to 1462 m 2 g −1 . We demonstrate the utilization of the resultant cryogel in uptake of carbon dioxide (7.9 wt % at 1 bar and 62.2 wt % at 25 bar, respectively) and uptake of aniline (333.3 mg g −1 at room temperature) from aqueous solutions. The adsorption behaviors of aniline on the hypercrosslinked cryogels are found to follow Langmuir model as well as Freundlich model in equilibrium adsorption and to follow pseudo-second-order model in kinetic adsorption, respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47716.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2024
·
IF 3.1
Li Mingao,Zhang Huidan,Zhong Wenlin,Ou Jiming,He Jianfeng,Wu Quanzhou
The ability to control the homogeneous morphology and tune the macropore size is of great significance for tailoring monolithic columns with ideal separation performance. In this paper, the preparation of three-dimensionally ordered macroporous polymer monoliths (OMMC) by a colloidal crystal templating method is reported. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption and thermal analysis were used to characterize the chemical composition, pore structure and thermal stability of the OMMC. The results demonstrated that ordered macroporous carboxyl-functionalized polyester monolithic column (OEMC) and ordered macroporous carboxyl-functionalized polystyrene monolithic column (OSMC) could be successfully prepared by using SiO 2 colloidal crystals as porogen. Both OEMC and OSMC had a three-dimensionally ordered macroporous structure with high porosity, submicron-scale pore walls and macropores. Their macropore diameters were easily controlled from 192 to 772 nm by using different monodisperse SiO 2 beads. Compared to OEMC, OSMC had higher mechanical strength and showed greater solvent resistance to water and methanol. The permeability of OSMCs was 1.33 ~ 3.59 × 10 –15 m 2 . Depending on the electrostatic force, a 4.6 × 10 mm short column had an ability to distinguish between lysozyme (LYZ) and bovine serum albumin (BSA). The highest column efficiencies ( n ) corresponding to LYZ and BSA were 5494 and 1992 N·m −1 , respectively. This study will provide valuable guiding suggestions for the development of 3DOM monolithic columns.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL SCIENCES
·
2022
·Vol. 38
·期 7
·969-975
·
IF 1.967
Zhu Anhong,Kan Xianwen
A novel kind of three-dimensional ordered macroporous molecular imprinted polymer (3DOM MIP) was prepared and studied. Monodisperse silica microspheres were used to form silica crystal template via simple centrifuge. In the presence of template molecule, acrylamide and trimethylolpropane trimethacrylate were co-polymerized in the interstices of crystal template bisphenol A (BPA). Hydrofluoric acid were employed to etch silica crystal and the mixed solvent of methanol with acetic acid were employed to extract template molecule. The results of SEM and FTIR confirmed the successful synthesis of 3DOM MIP. The obtained 3DOM MIP exhibited a rapid adsorption kinetics and a specific adsorption capacities toward template molecule because of the small size of MIP wall, which possessed much more effective imprinted cavies. Meanwhile, 3DOM MIP could selective recognized BPA from its structural analogues. Graphical abstract
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Siqi Zhuo,Yan Liu,Wei Li,Zhi Ding,Mingda Li,Qianjin Li,Xin Wang,Jie Liu,Rui Shao,Qianqian Ling,Tiesong Zheng,Jianlin Li
Ordered porous materials are attracting enormous attention due to their uniform pore structures, particularly the magnetic photonic crystal microspheres (PCMs) which not only possess unique photonic crystal structure but also can achieve separation easily based on magnet. Here, a two-phase microfluidic self-assembly synthetic system was established simply and employed for the preparation of three dimensional PCMs (3DPCMs) by using the emulsion droplet approach. One phase (dispersed phase) was an aqueous emulsion containing Fe 3 O 4 , silica (SiO 2 ) and polystyrene (PS) nanoparticles; another phase (continuous phase) was pure silicone oil. The droplets were formed by introducing the dispersed phase into the continuous phase through a tee valve. By heating the droplets, the water would evaporate and the nanoparticles would finally assemble into solid microspheres, which could be changed into macroporous 3DPCMs after removal of the PS nanoparticles by calcination. The contents and particle sizes of Fe 3 O 4 , SiO 2 and PS nanoparticles in the dispersed phase were investigated in detail and optimized to prepare macroporous magnetic 3DPCMs with high quality. The morphologies, surface crystal structure, magnetic property, particle size distribution, specific surface area and pore size of the macroporous magnetic 3DPCMs were characterized. The expected 3DPCM displayed regular and uniform photonic crystal structure, narrow particle size distribution and strong magnetic property. The macroporous magnetic 3DPCMs grafted with vomitoxin (DON)-antibodies could be applied for selective enrichment of DON in real samples.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 27
·13194-13201
·
IF 7.233
Ting Liu,Yongxin Liu,Lili Yao,Wenxiu Yang,Long Tian,Huiling Liu,Dan Liu,Cheng Wang
Citric acid (CA) is introduced to modulate the synthesis of octahedral HKUST-1 (also known as Cu3(BTC)2, BTC = benzene-1,3,5-tricarboxylate) particles with hierarchical micro, meso- and/or macropores (noted as HP-HKUST-1 particles) under mild conditions. The particle size of the resultant product could be tuned from 300 nm to 2.4 μm by varying the amount of CA added, solvents, reaction time and so on. The intrinsic microporous structure of HKUST-1 is maintained despite the strong chelation capability of CA towards Cu2+ while the larger pores’ size is in the range of 30 to 100 nm. The possible formation mechanism of these octahedral HP-HKUST-1 particles is proposed on the basis of our systematic investigations. The resulting micrometer HP-HKUST-1 particle is employed to encapsulate phosphomolybdic acid hydrate (HPMo), a catalyst for the methanolysis of styrene oxide. After encapsulation, a superior catalytic activity with a high conversion rate (99.6%) is achieved when the reaction is carried out at 40 °C for 20 min.
研究领域:
材料化学
·
纳米科技
·
多孔材料
·
催化化学
·
晶体工程
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2016
·Vol. 9
·期 3
·458-464
·
IF 4.724
Ting Yang,Lan-Lan Lou,Wenjun Yu,Yajun Feng,Hao Li,Kai Yu,Shuangxi Liu
Graphical Porous but extraordinarily durable : 3 D ordered macroporous alumina–carbon composite supported Pt nanocatalysts are applied in the asymmetric hydrogenation of ethyl pyruvate. They exhibit high catalytic activity and extraordinary durability. The three-dimensionally ordered macroporous alumina-carbon composite materials were firstly prepared through a surfactant-assisted colloidal crystal template method and applied to support Pt nanoparticles. The results of SEM, XRD, TEM, and N 2 sorption analyses revealed that these composite materials possessed highly ordered macroporous structures with meso- and micropores within the skeletons of macropores and that the Pt nanoparticles were well dispersed on these materials with a very narrow size distribution. These prepared Pt nanocatalysts were evaluated in the asymmetric hydrogenation of ethyl pyruvate after chiral modification with cinchonidine. Excellent catalytic activity and enantioselectivity were achieved. More importantly, these catalysts exhibited extraordinary stability and reusability during the reaction and could be reused at least 26 times without significant loss in catalytic activity and enantioselectivity.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）