CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Juntao Tang,Xinlong Wang,Yusheng Huang,Xiaopeng Du,Zhiqiao He,Da Wang,Shuang Song
The relatively weak activity and serious deactivation of anatase TiO 2 nanosheet catalysts with highly exposed {0 0 1} facets ({0 0 1}-TiO 2 ) limits its wide application in photocatalytic degradation of gaseous pollutants. Herein, we propose a hybrid photocatalyst composed of {0 0 1}-TiO 2 and SiO 2 with numerous hydroxyl groups (denoted as {0 0 1}-TiO 2 /HO-SiO 2 ). The catalyst showed excellent performance for gaseous toluene degradation under UV illumination, with 99.2 % removal efficiency and 204.7 μmol L −1 CO 2 yield (about 85.9 % mineralization efficiency) within 120 min. It also demonstrated superior durability over five consecutive cycles of toluene photodegradation. The modification of HO–SiO 2 on {0 0 1}-TiO 2 facilitate the selective adsorption of toluene on the catalyst surface by H-bonding interaction, and make the major poisoning species, benzoic acid, easily desorb from the surface, reducing the catalyst inactivation. Most importantly, we found that the formed Ti O Si bond promotes the separation of photogenerated electron–hole pairs, and provides abundant available electrons for the formation of reactive oxygen radicals and the left holes for the conversion of toluene to benzyl radicals or oxidation of H 2 O to hydroxyl radicals, which results in the improved activity. This study highlights the importance of the introduction of secondary components with special functions on TiO 2 , which is helpful for the design of photocatalysts with high performance and anti-deactivation ability for treatment of volatile organic compounds.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
MOLECULES
·
2024
·
IF 4.2
Qianchun Zhang,Xixi Long,Shan Tang,Li Jiang,Zhaoru Ban,Yanju Chen,Runkun Zhang
A simple, rapid, and reliable method for detecting harmful gases is urgently required in environmental security fields. In this study, a highly effective cataluminescence sensor based on SiO 2 /MIL-53(Al) composites was developed to detect trace isobutylaldehyde. The sensor was designed using isobutylaldehyde to generate an interesting cataluminescence phenomenon in SiO 2 /MIL-53(Al). Under optimized conditions, a positive linear relationship was observed between the signal intensity of the cataluminescence and isobutylaldehyde concentration. The isobutylaldehyde concentration range of 1.55–310 ppm responded well to the sensing test, with an excellent correlation coefficient of 0.9996. The minimum detectable concentration signal-to-noise ratio ( S/N = 3) was found to be 0.49 ppm. In addition, the sensor was effectively utilized for analyzing trace isobutylaldehyde; the analysis resulted in recoveries ranging from 83.4% to 105%, with relative standard deviations ( RSDs ) of 4.8% to 9.4%. Furthermore, the mechanism of cataluminescence between SiO 2 /MIL-53(Al) and isobutylaldehyde was explored using GC–MS analysis and density functional theory. We expect that this cataluminescence methodology will provide an approach for the environmental monitoring of isobutylaldehyde.
研究领域:
环境科学
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材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Fapeng Wang,Li Wang,Huaping Wu,Jiuyin Pang,Di Gu,Song Li
Biological microstructures have been a source of inspiration for scientific researchers and artists. In this paper, the microstructure of the lotus leaf was replicated on the bamboo surfaces by soft lithography, using a fresh lotus leaf as the template and polydimethylsiloxane (PDMS) for a seal. And the hydrophobic monodisperse nano SiO 2 microspheres were added to improve the strength, abrasion resistance, and water resistance of the bamboo surfaces. X-ray diffraction (XRD) pattern, scanning electron microscopy (SEM) and atomic force microscope (AFM) showed that the lotus-leaf-like bamboo had a polycrystalline surface, and the lotus-leaf-like topography played a very important role in the fabrication of the superhydrophobic surface. The water contact angle (WCA) of lotus-leaf-like bamboo surface was 152.5° with a low hysteresis showing a good superhydrophobic property. The successful preparation of the lotus-leaf-like bamboo provided a new method for researches on the water corrosion resistance of bamboos, and also confirmed the feasibility that hydrophilic surfaces like the bamboo could be achieved with the nanotechnology.
研究领域:
材料科学
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生物仿生学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Haolan Liu,Zhili Chang,Jie Fu,Zhaoyin Hou
Cu-based catalysts play pivotal role in many industrial processes, however, its application under high temperature is restricted due to the low Tammann temperature of Cu. Improving the stability and activity of Cu-based catalysts at high temperature is a challenge. In this work, a stable Cu/ZnO@SiO 2 catalyst was prepared, in which silicon was introduced into CuZn-BTC precursor via a steam-assisted hydrolysis method before calcination and reduction. Characterizations found that Cu/ZnO@SiO 2 catalyst prepared via above strategy possesses increased surface area, more exposed active sites and excellent stability for ethanol dehydrogenation than Cu/ZnO (prepared from CuZn-BTC without SiO 2 ). It was confirmed that the space-time yield of acetaldehyde reached 9.0 g-acetaldehyde/g-cat/h, and Cu/ZnO@SiO 2 could maintain its activity within 200 h at 350 °C due to the ZnO decorated Cu particles (Cu/ZnO) were encapsulated in the octahedral shaped SiO 2 hollow.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2013
·Vol. 13
·期 10
·6953-6960
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IF 1.149
Shi Haowei,Huang Yan,Cheng Chao,Ji Guoyuan,Yang Yuxiang,Yuan Hongming
The size- and shape-controlled Fe3O4@SiO2 nanocomposites were successfully synthesized via the sol–gel method. The results showed that the size, shape, and property of the products were directly influenced by the amount of TEOS, and the concentration
of water-based magnetic fluid in the coating process. The morphology and properties of the products were characterized by TEM, SEM, X-ray powder diffraction, IR and EDS. The Fe3O4@SiO2 composites with easily-controlled size arranged from 58 to 835 nm could
be synthesized by adjusting the experimental parameters. When TEOS amount is 1 mL and the concentration of magnetic fluid were 30.0 and 10.0 mg/mL respectively, chain-like and peanuts-like well-dispersed Fe3O4@SiO2 particles with clear core–shell structure
were obtained. These size- and shape-controlled Fe3O4@SiO2 composites may have potential application in the field of targeted drug delivery and MRI contrast agent.
研究领域:
材料科学
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纳米医学
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2023
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IF 8.4
Wenhui Yao,Jie Qin,Yonghua Chen,Liang Wu,Bin Jiang,Fusheng Pan
A slippery liquid-infused porous surface (SLIPS) was developed, based on MgAl-layered double hydroxide (LDH), in order to improve the corrosion and wear resistance of AZ31 Mg alloys. In particular, different concentrations of SiO 2 nanoparticles were incorporated into the silicone oil to further ameliorate the performances of Mg alloys, which can effectively seal the nanopores constructed by MgAl-LDH. With increasing SiO 2 nanoparticle concentration, the nanosheet microstructure of MgAl-LDH was gradually covered by the hierarchical structure of SiO 2 nanoparticles. The formed composite SiO 2 -SLIPSs exhibited good surface hydrophobicity and superior corrosion and wear resistance. When the concentration of SiO 2 nanoparticle was 10 mg mL −1 , the composite SLIPS showed the best performances, with the lowest corrosion current density of 2.43 × 10 -10 A cm −2 and wear volume of 0.041 mm 3 . The developed composite SLIPSs could find wide applications in effective corrosion and wear protection of Mg alloys in industry.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
E-POLYMERS
·
2020
·Vol. 20
·期 1
·600-605
·
IF 1.675
Zhang Dai,Fangfang Yan,Mei Qin,Xu Yan
Nowadays, different kinds of polymers, including ceramics, are electrospun into fibrous materials with different structures by electrospinning. Generally, the as-spun ceramic fibers are randomly oriented membranes and brittle without flexibility. Here, we report the fabrication of flexible SiO 2 electrospun yarns using poly(vinyl alcohol) (PVA) as a template through a conjugate electrospinning process and calcination. It was found that the calcined as-spun fibers and yarns are obviously thinned with PVA component removal. Fourier transform infrared spectroscopy and energy-dispersive spectroscopy examinations suggested that the obtained yarn after calcination was SiO 2 yarn. The SiO 2 yarn showed good flexibility without cracking after 180° bending. The flexible ceramic yarn may have potential application in functional textiles.
研究领域:
材料科学
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纺织工程
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2022
·Vol. 107
·期 1
·178-189
·
IF 2.606
Li Qing,Qian Fuping,Yuan Ke,Dong Wei,Han Yunlong,Lu Jinli
In order to solve the problem of blocking the filter media when bag filters are used to deal with high-humidity dust, hydrophobic surface-modified filter media were prepared. Here we constructed a multi-layer rough structure using TiO 2 and SiO 2 , with polydimethylsiloxane (PDMS) subsequently deposited to reduce its surface energy to prepare stable and robust TiO2–SiO2@PDMS modified superhydrophobic filter media. Through modification of the filter media, its surface was changed from superhydrophilic to superhydrophobic, and the water contact angle reached 158°. For the particles with 0.3 μm, the filtration efficiency and quality factor of the modified filter media are higher than those of the unmodified filter media at a flow velocity of 0.043–0.127 m/s, which improves the filtration performance of the filter media. In addition, the modified filter media has strong durability in harsh environmental conditions (such as mechanical wear, strong acid or alkali solution), and has excellent self-cleaning performance. Therefore, such superhydrophobic filter media have great potential for the application of bag filters in various industrial production processes.
Graphical abstract
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Yichun Peng,Shenghua Ma,Zhihua Shao,Qiangzhou Rong
Photoacoustic imaging is a new noninvasive imaging technology that combines the advantages of optical imaging and ultrasound imaging. Using materials with good photoacoustic effects can improve imaging contrast and resolution. With the development of photoacoustic imaging in the field of medical treatment, research pertaining to photoacoustic functional materials is progressing continuously. In this study, we effectively synthesize a multifunctional photoacoustic and magnetocaloric nanomaterial, i.e., SiO2/C/Fe3O4 via a one-step synthesis method. For theoretical analysis, the finite elemental analysis method is used to simulate the photoacoustic and magnetocaloric signals of the material. To obtain the experimental results, the SiO2/C/Fe3O4 suspension is excited by a 532 nm nanosecond pulsed laser irradiation to obtain the photoacoustic signal of the material. The temperature increase of the material is measured under a 365 kHz alternating magnetic field. The results show that SiO2/C/Fe3O4 exhibits good photoacoustic and magnetocaloric effects, rendering it feasible as a contrast agent for photoacoustic imaging and magnetocaloric therapy.
研究领域:
医学影像学
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材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Lai Nanjun,Zhu Qingru,Qiao Dongyu,Chen Ke,Tang Lei,Wang Dongdong,He Wei,Chen Yuemei,Yu Tong
To improve CO2 adsorption performance of nanoparticle absorbents, a novel tertiary amine functionalized nano–SiO2 (NS–NR2) was synthesized based on the 3–aminopropyltrimethoxysilane (KH540) modified nano–SiO2 (NS–NH2) via methylation. The chemical structure and performances of the NS–NR2 were characterized through a series of experiments, which revealed that NS–NR2 can react with CO2 in water and nanofluid with low viscosity revealed better CO2 capture. The CO2 capture mechanism of NS–NR2 was studied by kinetic models. From the correlation coefficient, the pseudo second order model was found to fit well with the experiment data. The influencing factors were investigated, including temperature, dispersants, and cycling numbers. Results has shown the additional surfactant to greatly promote the CO2 adsorption performance of NS–NR2 because of the better dispersity of nanoparticles. This work proved that NS–NR2 yields low viscosity, high capacity for CO2 capture, and good regenerability in water. NS–NR2 with high CO2 capture will play a role in storing CO2 to enhanced oil recovery in CO2 flooding.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
KEY ENGINEERING MATERIALS
·
2015
·
IF 0
Yin Yan Ding,Bi Xu,Feng Yan Ge,Zai Sheng Cai
In this work, self-cleaning cotton fabrics were prepared based on the TiO2-SiO2-Polydimethylsiloxane (PDMS) composites. TiO2-SiO2 composites were synthesized by depositing TiO2 nanocrystals onto preformed porous SiO2 and PDMS was used to enhance the linkage between TiO2-SiO2 composites and cotton fabrics. The TiO2-SiO2-PDMS composites coated cotton fabrics show superhydrophobicity with a water contact angle of 157°because of the abundant of methyl groups and hierarchical roughness features of the coated cotton fabrics. Meanwhile, the TiO2-SiO2-PDMS composites coated cotton fabrics display photocatalytic property, which were analyzed based on the removal and degradation of rhodamine B (RhB) under ultraviolet light. Abrasion resistance test indicates that the coating possesses a good mechanically durability.
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 6
·1-15
·
IF 2.8
Xiao Lijuan,Zhou Jingkai,Yu Zhixuan,Dong Huihao,Chen Yan
In the research of flexible smart electronics, obtaining particular structure electrodes to provide excellent electrochemical performance remains challenging. Here we report the synthesis and characterization of nanocomposite by a two-step method of polypyrrole (PPy) with Co 3 O 4 @SiO 2 in the presence of an oxidizing agent. Co 3 O 4 @SiO 2 was prepared by firing SiO 2 -coated zeolitic imidazolate framework-67 (ZIF-67/SiO 2 ) in a tubular furnace at a high temperature. Subsequently, PPy was coated and dispersed on Co 3 O 4 @SiO 2 by chemical methods at room temperature. In addition, we also explored the optimal ratio experiment of Co 3 O 4 @SiO 2 and PPy. The results show that the specific capacitance of Co 3 O 4 @SiO 2 and Co 3 O 4 @SiO 2 /PPy (2 mL) is 33.36 A/g and 107.7 A/g, at 0.6 A/g current density, indicating that the addition of PPy greatly improves the electrochemical performance of Co 3 O 4 @SiO 2 . This may be due to synergies between Co 3 O 4 @SiO 2 and PPy polymers, and the addition of PPy may help Co 3 O 4 @SiO 2 to construct more ion channels to enhance ion transport. This report will contribute to the development and application of cobalt oxide and silicon-shell electrode materials in the field of energy storage. It is helpful for the development and application of cobalt oxide and silicon-shell structures as electrode materials in the field of energy storage.
研究领域:
材料科学
·
能源存储
✓ 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）