INTERNATIONAL JOURNAL OF PHOTOENERGY
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2014
·
IF 0
Sujing Yu,Juncheng Hu,Jinlin Li
Self assembly of TiO2/CdS mesoporous microspheres was synthesized via hydrothermal method. The samples were characterized by X-ray powder diffraction (XRD), ultraviolet-visible diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), energy-dispersive spectroscopy analysis (EDS), high-resolution transmission electron microscopy (HRTEM), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), and photoluminescence spectra (PL). The as-synthesized TiO2/CdS mesoporous microspheres showed superior photocatalytic activity for the degradation of RhB under either visible light or simulated sunlight irradiation; the 10 wt% TiO2/CdS sample showed the best performance. Moreover, this catalyst showed improved stability, and the activity did not decrease significantly after four recycles. The heterojunction between TiO2 and CdS may be favorable for the transport of photoinduced electrons from CdS to TiO2. In addition, the mesoporous structure could increase the utilization of light energy and facilitate the diffusion of reactants and products during the photocatalytic reaction.
研究领域:
材料科学
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环境科学
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DOI
IONICS
·
2018
·Vol. 25
·期 5
·2211-2219
·
IF 2.347
Chen Si,Gao Lin,Zhang Lulu,Yang Xuelin
Four types of mesoporous Na 2 Ti 3 O 7 (NTO) microspheres have been successfully prepared utilizing different concentrations of NaOH treatment. The specific surface areas and pore size distributions of NTO can be well controlled by means of adjusting the amount of NaOH additives. In the meanwhile, the corresponding electrochemical performance has been detected and analyzed. It is concluded that the 3 M-NTO sample prepared with 3 M NaOH solution exhibits the best electrochemical performance. We consider that the less or excess amount of NaOH might not be beneficial to building the most optimal model for efficient Na + ion storage. The addition of NaOH less than 2 M leads to the relatively low surface areas and pore volume, bringing about limited contact areas between active materials and Na + ions as well as unsatisfied specific capacity. On the other hand, the excess augment of NaOH is reversely detrimental to the improvement of electrochemical performance probably owing to the fragile construction of NTO caused by the abundant mesopore distribution.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Lin Gao,Xiangru Li,Hao Hu,Guojian Li,Haowen Liu,Ying Yu
A facile solvothermal treatment without any template is employed to synthesize TiO 2 mesoporous microspheres with nanorod structure. The post-calcination of the microsphere sample at 500 °C with carbon source leads to the formation of C-coated TiO 2 with the same structure . All of the prepared samples have been characterized by the techniques of X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Additionally, N 2 adsorption-desorption isotherm curves have been depicted to show the tunable mesopores and high specific surface area of the prepared pure and C-coated TiO 2. A growth scheme is also proposed to elucidate the formation process of the mesoporous microspheres with nanorods on the surface. The electrochemical results show that both of the prepared samples have better electrochemical performance than commercial anatase TiO 2 due to the nanorod and mesoporous structures, which provides direct and open channals for efficient Li + ion diffusion. Moreover, the prepared C-coated TiO 2 has superior rate property and cycling performance with specific capacity of 157.4 mAh g −1 at 1C rate even after 200 cycles. The galvanostatic charge-discharge voltage indicates that the C-coated TiO 2 with improved electronic conductivity has the broadest voltage platform comparable to Li 4 Ti 5 O 12 . Therefore, the C-coated TiO 2 with mesoporous microspheres and nanorod structure can be an attractive candidate as functional anode materials.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Haichao Xu,Baijun Liu,Mingyao Zhang
This study reports the preparation of polystyrene-divinylbenzene mesoporous microspheres and their composite microspheres with silver nanoparticles using two-step seed-swelling polymerization. Not only the effects of different swelling agents on the morphology and structure of mesoporous microspheres were investigated, but also the difference between sulfonic acid microspheres and silver nanoparticle composite microspheres was discussed during the degradation of methylene blue (MB) dyes. The composite microspheres were characterized using X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), Thermogravimetric analysis (TGA), specific surface area and pore size analyzer (BET) and Energy-dispersive spectrometer (EDS) techniques. In the dibutyl phthalate system, a small amount of toluene was introduced, which increased the specific surface area of mesoporous microspheres to 68.51 m 2 /g, while the average pore diameter decreased to 13.62 nm. The degradation experiments showed that the sulfonic acid groups, introduced by the hydrophilic modification, had electrostatic interactions with MB, which promoted the rapid adsorption of MB through microspheres. Meanwhile, the loaded silver nanoparticles (Ag NPs) could also catalyze the reduction of MB, which further improved the rate of degradation of MB using the composite microspheres. Therefore, compared with sulfonated polystyrene mesoporous microspheres (SPPS), the removal efficiency of Ag@SPPS composite microspheres for MB was almost twice. In addition, after five cycles of recycling, the Ag@SPPS composite microspheres maintained a degradation efficiency of 97.12%, indicating excellent reuse value. The results provide a novel pathway to treat dye-containing wastewater.
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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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 17
·6304-6312
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IF 8.262
Shengyang Tao,Yandong Chen,Huan Wang,Jieshan Qiu,Xinkui Wang
A highly dispersed catalyst supported on mesoporous microspheres was prepared via the self-assembly of amphiphilic ligands. In a mixed solvent of water and ethanol, mesoporous microspheres were fabricated using bipyridine-based amphiphilic molecules as structure-directing agents for self-assembly with tetraethoxysilane. The microspheres had an average diameter of 979 nm, and their surface area and pore size were 720 m2 g−1 and 2.86 nm, respectively. Solid-state nuclear magnetic resonance characterization revealed the synthesized mesoporous microspheres display a special coordination effect with ferrous ions. Transmission electron microscopy analysis and energy-dispersive X-ray spectroscopy element mapping indicated that iron oxide was highly decentralized in the mesoporous microspheres after calcination in an O2 atmosphere. Loading iron oxide onto the mesoporous material via the impregnation method produced a completely different effect, with the iron oxide particles larger outside the mesoporous channels. The activity of the obtained catalyst was investigated using a Fenton reaction. In this reaction, the synthesized highly dispersed catalyst displayed strong catalytic activity in dye degradation, even when the dye concentration was as high as 400 ppm. The dye was almost entirely removed within 6 h, and the catalyst could be reused many times.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Shaoxiong Liu,Xiao Li,Siwei Zhong,Wenjia Jiang,Ye Liu,Wenchong Ding,Hai Hu,Zhifeng Huang,Li Liu
NASICON-structured Ti-based polyanion compounds benefit from a stable structural framework, large ion channels, and fast ion mobility . However, the large radius of potassium and its poor electronic conductivity restrict its use in potassium-ion batteries. Herein, hierarchical mesoporous Mn 0.5 Ti 2 (PO 4 ) 3 @C microspheres have been successfully synthesized using a simple electrospraying method. These microspheres consist of Mn 0.5 Ti 2 (PO 4 ) 3 nanoparticles evenly embedded in three-dimensional mesoporous carbon microspheres. The hierarchical mesoporous micro/nanostructure facilitates the rapid insertion and extraction of K + , while the three-dimensional carbon microspheres matrix enhances electrical conductivity and prevents active materials from collapsing during cycling. So the hierarchical mesoporous Mn 0.5 Ti 2 (PO 4 ) 3 @C microspheres exhibit a high reversible discharge specific capacity (306 mA h g −1 at 20 mA g −1 ), a notable rate capability (123 mA h g −1 at 5000 mA g −1 ), and exceptional cycle performance (148 mA h g −1 at 500 mA g −1 after 1000 cycles). The results show that electrosprayed Mn 0.5 Ti 2 (PO 4 ) 3 @C microspheres are a promising anode for PIBs.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2019
·Vol. 12
·期 8
·1937-1942
·
IF 8.515
Sun Hongxia,Du Haoran,Yu Mengkang,Huang Kuangfu,Yu Nan,Geng Baoyou
Vesicular lithium vanadium phosphate/carbon hollow mesoporous microspheres were fabricated using a facile polyvinylpyrrolidone-assisted aerosol-spray-assisted method and subsequent heat-treatment. While changing the content of polyvinylpyrrolidone, we found that carbon content was adjustable on the surface of lithium vanadium phosphate. By optimizing the carbon content among the composites, the electrochemical performance can be enhanced significantly. The results of electrochemical performance tests suggested that the samples exhibited good cycle performance and high discharge capability in the voltages between 3.0–4.8 V. The observed excellent electrochemical performances could be attributed to the proper content of carbon coating and the vesicular hollow mesoporous microsphere structure, increasing the transmission rate of lithium ions and reducing the structural change during charging and discharging effectively.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 30
·45623-45634
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IF 5.19
Liang Linqing,Wang Jiahong,Tong Xinhao,Zhang Shutong
The Fe 3 O 4 @nSiO 2 @mSiO 2 /NTA (FNMs-NTA) was prepared by grafting magnetic mesoporous microspheres with nitrilotriacetic acid (NTA) and applied as an adsorbent for the removal of Cr(III) from complex solutions. Some characterization techniques including Brunauer–Emmett–Teller (BET), Fourier transform infrared spectrometer (FT-IR), X-ray diffraction (XRD), small-angle X-ray diffraction (SAXS), vibrating sample magnetometer (VSM), and thermal gravimetric analysis (TGA) were used to characterize functional groups and pore structure of FNMs-NTA, which proved that NTA was successfully decorated onto the magnetic Fe 3 O 4 @nSiO 2 @mSiO 2 (FNMs) and FNMs-NTA featured a regular mesoporous structure. The batch adsorption of Cr(III) by FNMs-NTA exhibited high adsorption capacity (16.0 mg·g −1 at pH 3.0, and 25 °C). Adsorption data followed Freundlich isotherm and adsorption process was a spontaneous adsorption process. Moreover, the kinetics of adsorption were well explained by pseudo-second-order kinetic model. FNMs-NTA showed resistance to interfering inorganic cations (Na + , Ca 2+ ) and complexing agents (EDTA). Furthermore, FNMs-NTA exhibited remarkable regeneration performance and easy separation under external magnetic field. X-ray photoelectron spectroscopy (XPS) analysis showed the FNMs-NTA had excellent adsorption ability for Cr(III) because of the ion exchange and surface complexation.
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
PubMed
高影响因子
Journal of Biomedical Nanotechnology
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2021
·Vol. 17
·期 8
·1668-1678
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IF 4.099
Zhang Beizhi,Chai Yunhui,Huang Kai,Wei Xuejie,Mei Zhiqing,Wu Xiaopei,Dai Honglian
As infection induced by the implant will lead to operation failure, the implant material must be endowed with certain antibacterial properties. Hydroxyapatite (HA) mesoporous microspheres have been widely used in bone repair due to their advantages, including simple synthesis, good
osteogenic properties and drug loading capacity. In this study, vancomycin hydrochloride-loaded mesoporous hydroxyapatite microspheres with micro/nanosurface structures were synthesized to increase osteogenic differentiation and antibacterial ability. Phytic acid (IP6) was used as a template
to prepare mesoporous hydroxyapatite microspheres composed of fibres, flakes and smooth surfaces by the hydrothermal homogeneous precipitation method, and the corresponding specific surface areas were 65.20 m2/g, 75.13 m2/g and 71.27 m2/g, respectively. Vancomycin
hydrochloride (Van) was used as the drug model to study the drug loading and release characteristics of the microspheres, as well as the in vitro antibacterial properties after treatment. In addition, during cocultivation with MC3T3-E1 preosteoblasts, HA microspheres assembled via flakes
exhibited better cell compatibility, which promoted cell proliferation, alkaline phosphatase (ALP) activity, and the formation of calcium nodules and increased the expression of osteogenic differentiation-related proteins such as Runx-2, osteopontin (OPN) and collagen I (COL I). These results
indicated that the HA microspheres prepared in this experiment have broad application prospects in drug delivery systems and bone repair.
研究领域:
生物材料学
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医学工程
·
骨修复
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 39
·期 6
·4519-4525
·
IF 3.086
Yansheng Liu,Xinlin Li,Xuanduong Le,Wei Zhang,Hao Gu,Ruiwen Xue,Jiantai Ma
MCM-48 mesoporous microspheres (M48N) with a pore size of 3.77 nm, an ultra-high surface area of 1250.77 m2 g−1 and a super-large pore volume of 1.52 cm3 g−1 were synthesized. The M48N microspheres were then modified with Pd, Pt and Ru nanoparticles using an incipient wetness impregnation technique. The modified M48N microspheres were investigated to determine their catalytic effect in the aqueous phase hydro-dechlorination (HDC) of 4-chlorophenol. The Pd–M48N, Pt–M48N and Ru–M48N catalysts were characterized by transmission electron microscopy, X-ray diffraction, nitrogen adsorption–desorption and X-ray photoelectron spectroscopy. The HDC experiments were performed using the fairly mild conditions of room temperature and an atmospheric pressure of H2. Pd–M48N showed a higher catalytic performance than Pt–M48N and Ru–M48N and various other Pd-based catalysts. The high catalytic performance of Pd–M48N resulted from the ultra-high surface area, super-large pore volume and unique pore structure of the M48N, which improved the mass transfer and increased the rate of adsorption–desorption of the compounds. This method has potential applications in the treatment of industrial wastewaters contaminated with chlorinated organic compounds.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Wenying Gui,Huan Wang,Yang Liu,Qiang Ma
A dual-emission molecularly imprinted mesoporous microspheres was designed for specific recognition and highly sensitive and selective determination of malachite green (MG). In this ratiometric fluorescent sensor, green fluorescent CdTe quantum dots (QDs)-doped into the core of silica mesoporous microspheres serves as a reference and provides a built-in correction for environmental effects. The other red fluorescent CdTe QDs are embedded around the pores of the silica microspheres as analytical tag. Then, molecular imprinting technique are integrated with the ratiometric sensor to provide high selectivity for MG . When the photoluminescence (PL) of red CdTe QDs is selectively quenched in the presence of MG, a visual color change from orange to green can be observed by naked eyes. The sensing method has a linear response in the range of 27.4 nM–137 μM with a detection limit of 17.0 nM. Moreover, there is an excellent recognition specificity for MG over other water pollutants. The applicability of this method is evaluated through the determination of MG in river water and lake water samples with satisfactory results.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Shiqiang Cui,Shuqing Gu,Yaping Ding,Jiangjiang Zhang,Zhen Zhang,Zongqian Hu
Hollow mesoporous CuCo 2 O 4 (meso-CuCo 2 O 4 ) microspheres were successfully synthesized by decomposing metal-organic frameworks (MOFs) as the template. The as-prepared CuCo 2 O 4 microspheres were first simultaneously used for H 2 O 2 biosensing and glucose biofuel cell (GFC) as the enzyme mimic . The resulting of meso-CuCo 2 O 4 displayed not only excellent catalytic performances to H 2 O 2 including a super-fast response time (within 2 s), a super-high sensitivity (654.23 μA mM −1 cm −2 ) and a super-low detection limit (3 nM at S/N = 3) on the sensor, but also great values in GFC as anode material with an open circuit voltage of 0.85 V, a maximum power density of 0.33 mWcm −2 and a limiting current density of 1.27 mAcm −2 , respectively. The preeminent catalytic abilities to H 2 O 2 and glucose may be attributed to the surpassing intrinsic catalytic activity of CuCo 2 O 4 and large specific area of mesoporous structure. These significant findings deriving from this work not only provided a novel exploration for the fabrication of hollow spherical mesoporous bimetallic oxides, but also promoted the development of the supersensitive detection of H 2 O 2 and non-enzymatic biofuel cell.
研究领域:
材料科学
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生物传感
·
电化学能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）