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
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2018
·
IF 0
Rui Wang,Yu Kun Sun,Bao Jia Qi Jiang,Hui Yang,Xing Zhong Guo
Macroporous Ca12Al14O33 (C12A7) mayenite monoliths have been successfully prepared via a sol-gel process in the presence of propylene oxide (PO) and poly (ethyleneoxide) (PEO). Gelation of CaO-Al2O3 binary system with nitrates salts as additional precursors is accelerated by PO as an acid scavenger, while PEO works as a phase separation inducer to mediate the phase separation of the system. Appropriate PO and PEO amounts allow the formation of monolithic xerogel with interconnected macropores and co-continuous skeletons. The resultant dried gels are amorphous and the single crystalline phase Ca12Al14O33 mayenite forms after heat-treatment at 1100 °C in air, while the macrostructure is preserved with a porosity as high as 78% and smoother and denser skeletons.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
Arabian Journal of Chemistry
·
2018
·
IF 2.969
Du Yue,Jiaheng Lei,Lina Zhou,Xiaodi Du,Zhenran Guo,Junsheng Li
Ordered meso/macroporous H 3 PW 12 O 40 /SiO 2 nanocomposites with high specific surface areas were prepared using cationic surfactant and monodispersed polystyrene spheres (PS) as dual-template. The characterization results of scanning electron microscopy (SEM), transmission electron microscopy (TEM), N 2 adsorption-desorption, and small-angle XRD patterns confirmed the existence of ordered meso/macroporous structure and the wide-angle XRD patterns, Fourier transform infrared spectroscopy (FTIR), X-ray photoemission spectroscopy (XPS) measurements suggested the high dispersivity of the Keggin-type heteropolyacid (HPA) on silica matrix. There was an optimum value of cationic surfactant usage and proper calcination temperature of ordered meso/macroporous H 3 PW 12 O 40 /SiO 2 catalyst leading to ultra-high specific surface areas. Furthermore, the ordered meso/macroporous H 3 PW 12 O 40 /SiO 2 catalyst was evaluated for ultra-deep oxidative desulfurization (ODS) of cyclic sulphur-containing compounds using hydrogen peroxide (H 2 O 2 ) as oxidant. Under optimum reaction conditions, dibenzothiophene (DBT) could be removed within 100 min at 30 °C by meso/macroporous H 3 PW 12 O 40 /SiO 2 catalyst. The excellent catalytic activity should be attributed to the combination of ordered meso/macroporous architecture and high surface area of H 3 PW 12 O 40 /SiO 2 catalyst which promoted the mass transport of reactants and products in the pore channel and provided more accessible catalytic active sites. In addition, the meso/macroporous H 3 PW 12 O 40 /SiO 2 catalyst showed good stability with only 1.9% efficiency decreased after 6 cycles.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2016
·Vol. 301
·期 6
·659-664
·
IF 2.834
Xilu Chen,Weiwei Sui,Dayong Ren,Yuanyuan Ding,Xiaoli Zhu,Zhiyong Chen
A versatile approach to synthesis of hydrophobic polymeric cryogels is proposed using acetic acid crystals instead of ice crystals as porogen through cryo-polymerization. In the range of 60 to 90 vol% of acetic acid, polymerization at ambient temperature gives rise to particulate polymers in beaded or amorphous shape, while polymerization at 4 °C, lower than the melting point of acetic acid (16.6 °C), leads to the formation of cryogel-like monoliths with supermacroporous structure, which is mainly ascribed to cryo-concentration effect. According to the measurements by scanning electron microscopy and mercury intrusion porosimetry, the dried samples are supermacroporous with pore size mainly ranging from several micrometers to several hundred micrometers, which can be feasible for rapid mass transfer. The forming cryogels display a superfast responsiveness to organic solvents, possibly stemming from their supermacroporosity and distinctive hydrophobicity.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2019
·
IF 5.714
Zhi-Wei Huang,Zi-Jie Li,Li-Rong Zheng,Wang-Suo Wu,Zhi-Fang Chai,Wei-Qun Shi
One of the most important reasons for the controversy over the development of nuclear energy is the proper disposal of spent fuel . Separation of actinide and lanthanide ions is an important part of safe long-term storage of radioactive waste . Herein, a three-dimensional (3D) graphene-based macrostructure (GOCS) was utilized to remove actinide thorium and lanthanide europium ions from aqueous solutions. The adsorption of Eu(III) and Th(IV) on the GOCS was evaluated as a function of adsorption time, solution pH, initial ion concentrations , and ionic strength. The experimentally determined maximum adsorption capacities of this GOCS for Eu(III) (pH 6.0) and Th(IV) (pH 3.0) are as high as 150 and 220 mg/g, respectively. By using Fourier transformation infrared (FT-IR), X-ray photoelectron (XPS), and extended X-ray absorption fine structure (EXAFS) spectroscopy, we concluded that the Eu(III) and Th(IV) adsorption was predominantly attributed to the inner-sphere coordination with various oxygen- and nitrogen-containing functional groups on GOCS surfaces. Our selective adsorption results demonstrate that the actinide and lanthanide ions can be effectively separated from transition metal ions . This study provides new clues to the overall recycling of actinide and lanthanide ions in radioactive environmental pollution treatments.
研究领域:
环境科学
·
放射化学
✓ 已验证
产品关联
DOI
PubMed
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
·
纳米技术
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2014
·
IF 0
Cheng Bao Liu,Jun Chao Qian,Feng Chen,Zheng Ying Wu,Zhi Gang Chen
Negative-charged PS microspheres were prepared through emulsifier-free emulsion polymerization method. High-quality PS colloidal crystals were obtained via the horizontal deposition method. Hierarchically ordered macroporous CeO2 sheets were fabricated on fluorine-doped tin oxide (FTO) substrates using PS colloidal crystals as template by a continuous infiltration process. The structure and morphology of the products were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and nitrogen adsorption-desorption. The characterized results showed that macroporous CeO2 sheets replicated well three-dimensionally (3D) ordered structure derived from PS colloidal crystals template and possessed a relatively large specific surface area. Moreover, the synthesized hierarchical CeO2 sheets showed the highest photocatalytic activity under solar irradiation and also exhibited remarkable ability to remove methylene blue, suggesting they are promising catalyst for wastewater treatment.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
BIOMASS & BIOENERGY
·
2025
·
IF 5.8
Hao Wu,Jun Yang,Ge Yang,Pingping Wu,Wei Xing,Peng Bai,Zifeng Yan
Carbon materials with large interconnected pores are desired because of their excellent diffusion performance, but their synthesis is often cumbersome and costly. In this study, we systematically removed cellulose and hemicellulose from rice husk (RH) through oxidative decomposition and subsequently converted the residual material into rice husk carbon (RHC) with an interconnected mesoporous-macroporous structure via NaOH activation. After activation, the resulting RHC exhibits a foam-like morphology with exceptional porosity (S external = 970 cm 2 /g), which has not been previously reported in the literature. The meso-macroporous structure of RHC is highly correlated with the decomposition degree of RH, indicating that the pore structure originates from the oxidative decomposition process. Furthermore, due to the presence of abundant oxygen-containing functional groups on oxidatively decomposed RH, the consumption of NaOH for subsequent activation is significantly lower than that reported in previous studies (NaOH/char mass ratio of 1.17 for this work, compared to approximately 2–7 in traditional methods). The interconnected meso-macroporous channels of RHC materials result in the exceptional capacity for methyl orange adsorption capacity and fast diffusion rate (Adsorption capacity = 158 mg/g, K 1 = 0.115), exceeding CMK-3 (Adsorption capacity = 98 mg/g, K 1 = 0.063), a typical mesoporous carbon material.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2016
·
IF 2.048
Xingzhong Guo,Zichen Wang,Jie Song,Hui Yang
Monolithic macroporous barium zirconate derived from ionic precursors has been successfully prepared via a phase separation route in the presence of poly(ethylene oxide) (PEO) and propyleneoxide (PO). Poly(ethylene oxide) (PEO) acts as a phase separation inducer, while propyleneoxide (PO) acts as a gelation accelerant in the sol–gel process. Appropriate choice of poly(ethylene oxide) (PEO) and propyleneoxide (PO) allows the production of continuous macroporous monolithic gel with a porosity of ca. 63% and a macropore size of 1.8 µm. Some BaCl 2 recrystallizes in the dried gel, and subsequently tetragonal ZrO 2 phase precipitates after heat-treated at 800 °C. The crystalline phase barium zirconate forms after heat treatment at 1100 °C in air, while the macroporous structure is preserved with a slight increase of porosity and a decrease of macropore size.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yuxiao Feng,Hongtong Hu,Zichen Wang,Yingjie Du,Le Zhong,Chenxi Zhang,Yanjun Jiang,Shiru Jia,Jiandong Cui
Metal-organic frameworks (MOFs) have been emerged as a promising support for immobilizing enzymes owing to the tunable porosity, high surface area, and structural diversity. However, most of these possess nanometer size and small pores, which are difficult to recover them from the reaction medium and present low immobilization efficiency and protein loading capacity, and high substrate diffusion limitations. Herein, a novel magnetic amino-functionalized zeolitic imidazolate framework-8 (ZIF-8) with 3D highly ordered macroporous structure was synthesized using the assembled polystyrene (PS) nanosphere monoliths as a template. Subsequently, catalase (CAT) molecules were immobilized on the surface of macroporous magnetic ZIF-8 and inside the macropores by precipitation, covalent binding and cross-linking. The resultant immobilized CAT showed high immobilization efficiency (58%) and protein loading capacity (29%), leading to 500% higher activity than the immobilized CAT on ZIF-8 (CAT/ZIF-8). Meanwhile, the immobilized CAT could be easily recovered with a magnet without obvious activity loss. The traditional CAT/ZIF-8 lost its activity after 6 cycles, whereas, the immobilized CAT retained 90% activity of its initial activity after reusing for 8 cycles, indicating excellent reusability. In conclusion, this study provides a facile and efficient approach to immobilize enzymes on/in MOFs with enhanced activity and excellent recyclability.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yuan Li,Rui Yang,Rui Zhang,Bing Cao,Pei Li
Insoluble polyimides (PIs) are ideal materials for organic nanofiltration membranes. However, the membranes have to be prepared using soluble polyamic acid and then converted to PIs via chemical or thermal imidization. The low imidization degree of chemical imidization makes PI membranes easily hydrolyzed in water. On the contrary, a thermally imidized PI has a higher imidization degree and better chemical stability. However, the high imidization temperature (300 °C) often induces pore collapsing, membrane brittleness, and low flux. To overcome the drawbacks of thermal imidization, we developed a dual-coagulant bath method to prepare macrovoid-free poly(4,4′-oxydiphenylene pyromellitimide) membranes. The size, distribution, and connectivity of membrane pores were well controlled by tuning the compositions of the dope and the first coagulant. A series of thermally imidized flat-sheet PI membranes with macrovoid-free structures were prepared. These membranes exhibited good mechanical properties and stable nanofiltration performance in N,N-dimethylformamide solvent. This implied that the membranes were qualified for the separation process under harsh organic environments.
研究领域:
材料科学
·
分离工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 23
·期 4
·867-875
·
IF 1.385
Guo Xingzhong,Song Jie,Ren Jing,Yang Fanger,Kanamori Kazuyoshi,Nakanishi Kazuki
Yttria-stabilized zirconia monoliths with well-defined macropores and high porosity have been successfully fabricated via sol–gel process accompanied by phase separation. Propylene oxide acts as an acid consumer to mediate sol–gel process, and poly (ethylene oxide) is used to induce phase separation. Ethylene glycol is applied as chelating agent, and formamide serves as drying control chemical additive to inhibit cracking during drying stage. Proper proportion of the starting compositions allows the generation of well-defined macroporous YSZ monoliths with co-continuous skeletons and porosity as high as more than 60 %. The dried gels are amorphous and crystalline of ZrO 2 precipitates after heat treatment between 400 and 1200 °C without formation of monoclinic ZrO 2 , which indicating a wide application prospects.
研究领域:
材料科学
·
化学工程
✓ 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）