International Journal of Environmental Science and Technology
·
2020
·Vol. 17
·期 9
·4061-4074
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IF 2.54
Liu H.,Li D.,Shao L.,Wu D.,Zhang H.,Yuan J.,Xu F.
In this study, a crack-free PDMS–SiO 2 –BiPO 4 (P/Si/Bi) composite was prepared via a solgel-assisted route by dispersing pre-prepared bismuth oxybromide into a solution that was composed of hydroxyl-terminated polydimethylsiloxane (PDMS–OH), tetraethyl orthosilicate and phosphoric acid. Analysis via the FTIR, XRD, XPS and SEM–EDX techniques demonstrated that the nonisolated BiPO 4 particles with a monoclinic crystal phase were uniformly distributed on the surface of the P/Si/Bi composite, which can provide more active sites and a larger surface area for photocatalysis compared with other materials. The photocatalytic activity of the P/Si/Bi composite loaded with various mass ratios of BiPO 4 (9 wt%, 12 wt%, 18 wt% and 27 wt%) was investigated via the degradation of methylene blue (MB, 10 mg/L) under UV light irradiation. It was found that the P/Si/Bi composite loaded with 18 wt% BiPO 4 realized the highest degradation efficiency of MB, and its corresponding apparent rate constant was approximately 2.2 times that of the PDMS–SiO 2 –TiO 2 composite (loaded with 18 wt% TiO 2 ). The effects of inorganic ions on the degradation of MB were also investigated. The static contact angle and photocatalytic activity of the P/Si/Bi composite changed minimally after five cyclic experiments, thereby demonstrating its remarkable durability in sustainable applications. In addition, the photogenerated reactive species that were responsible for the degradation of MB within the P/Si/Bi composite were identified, and a photocatalytic mechanism was proposed.
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
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Liangyong He,Bin Yang,Sen Wang,Yuqing Yang,Yingying Wang,Haiyang Hu,Zhengzhi Zheng,Jiashuo Liu,Jiasheng Qian,Jibin Miao,Weiguo Zhang,Yuchao Ke
The increasing demand for improving the performance of optical devices and the development of nanotechnology have driven research on diffusion films. The preparation of diffusion films with well-defined microstructures can achieve uniform diffusion and scattering of light, thereby improving the efficiency and performance of optical devices. In this study, diffusion films with high transmittance and haze were prepared using PMMA@TiO2@SiO2 (P@T@S) composite microspheres, and the PMMA microspheres and nanoparticles were combined through electrostatic attraction. As compared with PMMA microspheres, the P@T@S composite microspheres displayed better heat resistance as well as swelling resistance. Optical performance data showed that the P@T@S diffusion film had the perfect optical performance with a transmittance up to 90.5% and a haze of 88.3%. The excellent light diffusion effect of the P@T@S diffusion film was experimentally demonstrated, with the light through the film not only displaying the largest area but also maintaining a relatively high brightness. Our findings can provide reference and guidance for further development of light diffusion films, which are of potential application in optoelectronic devices.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Ebrahim Ataeivarjovi,Zhigang Tang,Jian Chen
In this present work, a novel approach has been proposed by which a solvent absorption and membrane desorption methods can significantly reduce the carbon dioxide (CO2) emission and energy consumption. In this method, the CO2 capture processing is based on the combination of membrane and physical solvent. Here, dimethyl carbonate and polydimethylsiloxane (PDMS)–SiO2 nanocomposite were used as the physical solvent and desorption membrane, respectively. However, the main focus of this research was on the CO2 desorption behavior of PDMS–SiO2 hybrid membrane. To do so, the influence of the operating conditions and membrane properties on the pervaporation process to capture CO2 have been investigated. The PDMS–SiO2 hybrid membrane containing 10 wt % SiO2 was the most effective membrane. Results revealed that increase in CO2 concentration from 1.5 to 3 wt % led to decrease in the selectivity from 94 to 47 and increase in flux from 1.7 to 5.38 (kg/m2·h). In addition, an increase in temperature increased the flux and reached the highest level (8.17 kg/m2·h) at 40 °C. However, the selectivity decreased to 36.13. It was found that the addition of SiO2 nanoparticles to the PDMS membrane not only enhanced the membrane performance but also decreased the energy consumption about 75% compared with gas stripping method and mass transfer about 49% compared with pure PDMS membrane. Finally, these results illustrated that such a novel technique used for pervaporation separation process is a green and promising alternative to separate CO2 from the physical solvent.
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
MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Shuai Feng,Yan An,Zong Xiang Wang,Kai Sun,Run Hua Fan
In this work, the insulating SiO2 was coated successfully on the surface of reduced iron particles by a sol-gel method to decrease the core loss at low frequency. The scanning electron microscope images and elements analysis confirm that the surface of iron powders particles were covered by a thin insulating layer in the form of uniform core-shell structure. The samples were annealed at 400 °C in N2 atmosphere to obtain better magnetic properties. The annealed SMCs with 10 mL/h dropping rate of TEOS have optimum magnetic properties with low core loss Ps of 280.89 W/kg and high saturation magnetic flux density Bs of 1.038 T at 1000 Hz.
研究领域:
材料科学
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磁学
✓ 已验证
DOI
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2015
·
IF 2.729
Miaomiao Tian,Yongcun Zou,Shaoyan Zhou,Tianpeng Wang,Xueju Lv,Qiong Jia
Novel magnetic adsorbents based on Fe 3 O 4 /SiO 2 /poly(acrylamide- N , N' -methylene bisacrylamide) magnetic microspheres modified with non-ionic triblock copolymer surfactant were successfully prepared as a magnetic solid phase extraction adsorbent for the determination of trace natamycin in jam samples. The adsorbent was characterized by scanning electron microscopy, transmission electron microscopy, Fourier transformed infrared spectroscopy, vibrating sample magnetometer, and X-ray diffractometer analysis, confirming that Pluronic L64 was effectively functionalized on the magnetic materials. Various experimental parameters affecting the extraction capacity were investigated including adsorbent amount, extraction time, desorption time, sample pH, and ionic strength. For recovery evaluations, the jam samples were spiked at two concentration levels of 100 and 200 μg kg −1 of natamycin and the recovery values were in the range of 78.8–93.4%. The relative standard deviations (RSD) for the recoveries were less than 3.5%. The novel magnetic solid phase extraction method provided several advantages, such as simplicity, low environmental impact, convenient extraction procedure, and short analysis time when used for natamycin analysis.
研究领域:
分析化学
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食品科学
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产品关联
DOI
PubMed
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
·
2022
·Vol. 75
·期 10
·820-834
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IF 1.224
Haikuan Yuan,Cun Bao,Ruiran Hao,Jie Lu
A polyvinyl alcohol (PVA)/SiO2 organic-inorganic hybrid membrane was fabricated, using PVA as the basic material, SiO2 nanoparticles as the inorganic material, γ-(2,3)-glycidoxy propyl trimethoxysilane (GPTMS) and 3-aminopropyl triethoxysilane (APTEOS) as the second modified agents. The dehydration performance of PVA-SiO2/polyacrylonitrile (PAN) composite membrane to ethyl acetate (EA)/H2O, EA/ethanol (EtOH)/H2O and EA/EtOH/acetic acid (HAc)/H2O solutions was investigated. After modification of the second coupling agent of APTEOS or GPTMS, PVA-SiO2/PAN composite membrane had the better dehydration performance to these aqueous solutions. When dehydrating PVA-SiO2/PAN composite membrane modified by GPTMS (M5 membrane) in EA/H2O binary solution (98/2, wt%) at 40°C, the separation factor and the total permeation flux were 5245 and 293.9 g m−2 h−1, respectively. The preparation method of PVA/SiO2 membrane through adding the second coupling agent was simple, it had good dehydration performance and has excellent application prospects. The sorption behavior of PVA/SiO2 hybrid membrane was systematically studied, providing sufficient data for studying the separation mechanism of pervaporative membrane. The degree of swelling (DS) and the sorption selectivity of the membrane in different feed compositions and temperatures were measured to determine the static sorption of membrane. Dynamic sorption more clearly reflects the sorption and swelling processes of the membrane, and the dynamic sorption curves of the membrane in EA aqueous solutions were obtained. The sorption behavior of membrane to permeate components was studied by ATR-FTIR. Changes in the characteristic peaks for the permeate components and membrane indicated the sorption behavior of the membrane.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Xintao Zhou,Shuyu Tian,Xincong Tian,Zhongqiu Luo,Xiunan Cai,Yanjuan Zhang,Zuqiang Huang
The construction of highly active photocatalysts featuring the merits of high quantum efficiency and superior stability from solid wastes for the photocatalytic degradation of organics remains a great challenge. Herein, an acid leaching and in situ self-assembly strategy was proposed to engineer a series of FeC 2 O 4 /SiO 2 amorphous composites with a Si–O–Fe bridged interpenetrating structure, using copper smelting slag as the only source of Fe and Si. The loaded porous amorphous SiO 2 creates new charge transfer states within the FeC 2 O 4 crystal, and the formed Si–O–Fe bond acts as an electron conduction bridge, extensively promoting charge separation and utilization. The α-FeC 2 O 4 with wider layer spacing was generated under high temperature, which can provide smoother channels for charge transfer. Thus, α-FeC 2 O 4 with higher Si content (α-FOD/Si H ) showed excellent photocatalytic activity, achieving a chlortetracycline hydrochloride removal rate of 91.9 % within 120 min, which is 16.7, 3.8 and 2.0 times faster than copper smelting slag, α-FOD and β-FOD/Si H , respectively. The composite also exhibited remarkable structural stability, with the chlortetracycline hydrochloride removal rates remaining above 85.1 % after five consecutive cycles, ascribed to the interpenetrated SiO 2 structure and the formation of soluble [Fe 3+ -(C 2 O 4 2− ) 2 ] complexes, which greatly reduce iron ions release and prevent the formation of Fe(III) oxide/hydroxide passivation layers. This study provides a new idea for synthesizing highly active and stable FeC 2 O 4 catalysts through a “treat the wastes with wastes” strategy.
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
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Xuefeng Bai,Han Zhang,Yu Tu,Hao Ding,Sijia Sun
In this paper, a CaCO 3 /TiO 2 @SiO 2 composite pigment (CTS) was prepared by a carbonation reaction using a one-pot method. CTS can reduce the amount of rutile TiO 2 needed and improve the weatherability compared with TiO 2 and CaCO 3 /TiO 2 (CT). The performance test results showed that the composite pigment with 60% TiO 2 has a coating film contrast ratio of 91.05% of pure TiO 2 , and the oil absorption and whiteness values were also close to those of pure TiO 2 , indicating that the CTS has good pigment properties. The XPS and infrared results showed that the bonding of CaCO 3 , TiO 2 , and SiO 2 occurred at the interface. The tight bonding of the three substances was realized through a dehydroxylation reaction on the surface. In addition, the SiO 2 layer weaken the photocurrent response of TiO 2 in the CTS and reduced the UV absorption of the composite pigment, which slowed the degradation rate of rhodamine B in the composite pigment coatings; thus, the CTS exhibits excellent weatherability performance in coating applications.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Kai Zhao,Zhen Bao,Qi Liu
CsPbX3 (X = Cl, Br, and I) perovskite nanocrystals (PNCs) have been recognized as potential optoelectronic materials due to their excellent optical characteristics. However, their poor stability limits their further practical application, and research on their stability improvement mainly concentrated on green-emitted CsPbBr3 PNCs. Herein, high-stable red, green, and blue three-primary color CsPbX3-nanocrystal/SiO2 (PNC/SiO2) luminescent composites have been synthesized by a simple high-temperature melt-crystallization method, which did not use any solvent or ligand. The sintering conditions for PNC/SiO2 composites were optimized according to the X-ray diffraction and photoluminescence (PL) spectra, which ensured the composite structures and achieved higher PL quantum yield. The optimized red, green, and blue composites can remain at 99%, 90%, and 82% PL intensity after 15 heating loops, performing good thermal stability. To check the application potential, the optimized composites were fabricated as red, green, and blue light-emitting diodes (LEDs), showing high color purity to consist of a wide color gamut. The red, green, and blue LEDs remained at 83%, 82%, and 96% emission intensity and kept their color coordinates after a long working duration, showing excellent stability. The excellent stability and relatively higher color purity of the PNC/SiO2 composites indicate their great potential for commercial background display applications.
研究领域:
材料科学
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光学工程
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2025
·
IF 2.3
Jiexin Jiao,Guoqing Xiao,Donghai Ding,Shaonan Liu,Li Zhang
In order to improve the mechanical properties of the SiO 2f /SiO 2 composites, the uniform and complete Al 2 O 3 coatings were prepared on the quartz fibers via sol–gel method with aluminum isopropoxide as the precursor. The thickness of Al 2 O 3 coatings increases with concentration of aluminum isopropoxide precursor solution. The Al 2 O 3 coatings fabricated with 10 wt.% precursor solution were uniform and complete, and its thickness was approximately 430 nm. The SiO 2f /SiO 2 composites with Al 2 O 3 coatings achieve higher mechanical strength compared with the SiO 2f /SiO 2 composites without Al 2 O 3 coatings. The flexural strength of SiO 2f /SiO 2 composites increases with concentration of aluminum isopropoxide precursor solution. And the compressive strength shows a slightly decreasing trend with concentration of aluminum isopropoxide precursor solution. The mechanical performance of the SiO 2f /SiO 2 composites fabricated from fibers coated with 10 wt.% aluminum isopropoxide precursor solution was excellent, and its compressive strength was 57.1 MPa, flexural strength was 28.6 MPa. And the reason was that the Al 2 O 3 coatings effectively enhanced the interface isolation between the fiber and the matrix, optimizes the deflection path of the crack and increased the strength of the SiO 2f /SiO 2 composites. The mechanical strength of SiO 2f /SiO 2 composites with Al 2 O 3 coatings was increased after not only short-term but also long-term heat treatment.
研究领域:
材料科学
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工程学
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产品关联
DOI
高影响因子
Journal of Central South University
·
2025
·Vol. 32
·期 4
·1272-1283
·
IF 4.4
Song Ren-hong,Hu Jing,Li Xiao,Guo Hao,Zhang Wen,Tian Qian-qiu,Hu Wen-bin
As a cathode material for thermal batteries, NiS 2 has a high theoretical capacity but low thermal stability. Besides, the poor formability of NiS 2 powders also restricts the cathode performance of thermal batteries. In this paper, the novel NiS 2 /SiO 2 composite material was developed by high temperature vulcanization to improve the thermal stability formability of NiS 2 . The good filling and lubrication of spherical SiO 2 can improve the thermal conductivity of NiS 2 electrode. The discharge test shows that the NiS 2 /SiO 2 cathode has a stable discharge voltage at a current density of 200 mA/cm 2 , and the activation time is shortened by nearly 20% compared with the NiS 2 cathode. In addition, due to the favorable thermal insulation protection of SiO 2 , the initial decomposition temperature of NiS 2 is increased by 30 °C after the addition of SiO 2 . The incorporation of SiO 2 not only effectively improves the thermal stability and electrochemical properties of NiS 2 , but also improves the cold pressing forming performance of the NiS 2 powder. Therefore, the novel NiS 2 /SiO 2 composite material is more suitable for thermal batteries with high stability and fast response, which is of great significance for improving the maneuverability and quality reliability of weapons and equipment.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2012
·Vol. 88
·期 6
·1433-1441
·
IF 2.413
Cheng Peng,Xinjian Cheng,Sufang Chen,Xianghong Li,Tingcheng Li,Daohong Zhang,Zhengxi Huang,Aiqing Zhang
This article presents a facile method to prepare CdS/SiO 2 composite microspheres and their good catalytic properties. In our method, monodispersed SiO 2 particles bearing amino groups (–NH 2 ) were synthesized at first and then used as carriers to load nanosized CdS particles to form CdS/SiO 2 composite microspheres. With the addition of CdAc 2 solution to the SiO 2 dispersion, Cd 2+ was attracted to the surfaces of the SiO 2 particles through coordination interaction, and then thioacetamide was added to the dispersion. By heating, S 2− released and reacted with the Cd 2+ , CdS/SiO 2 composite microspheres were obtained accordingly. The photocatalytic properties of the as-prepared composite microspheres were investigated as well. It was found that the composite microspheres have excellent photocatalytic activities for the degradation of dyes comparing with the commercial P-25 TiO 2 catalysts. After using and recycling for three times, the photocatalytic performance still remained very well.
研究领域:
材料科学
·
环境科学
✓ 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）