AATCC Journal of Research
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2024
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IF 0.6
Que Kong,Zhiguang Li
In this paper, modified SiO2 nanoparticles were selected to improve the surface roughness and decrease the surface energy to improve the hydrophobic performance of cotton fabric. Tetraethoxysilane and octadecyltriethoxysilane were used as raw materials to synthesize octadecyltriethoxysilane-modified SiO2 nanoparticles (siloxane-SiO2), and combined with cotton fabric. The chemical composition and surface morphology of the fabric were measured. The contact angles of the modified cotton fabrics prepared under different reaction conditions were approaching or above 150°. In addition, dynamic evolutions of water droplets on the modified cotton fabric surface were discussed. The adhesive force and the energy conversion of droplet during the collision were investigated. The water droplet bounced due to the superhydrophobic properties of the cotton fabric surface producing enough residual energy. Finally, through the acid–base chemical resistance treatments, the rubbing and washing durability, and anti-fouling experiment, the modified fabric indicated excellent hydrophobic durability and self-cleaning performance.
研究领域:
材料科学
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纺织工程
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DOI
高影响因子
CATALYSIS LETTERS
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2019
·Vol. 150
·期 4
·1121-1127
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IF 2.372
Xu Siquan,Wu Ningxin,Yuan Hui,Chen Yuan,Pan Donghui,Wu Yuanfeng,Fan Jingdeng,Gao Lijing,Xiao Guomin
Abstract Silica-supported hafinum phosphide (HfP/SiO 2 ) was prepared and applied as an effective solid acid catalyst to drive furfural production from xylan. Various characterizations were employed to analyze the intrinsic properties of the HfP/SiO 2 catalyst, and the effects of process parameters on its performance were investigated in detail. The results showed that the performance of the HfP/SiO 2 catalyst was excellent, which allowed up to 85% of the furfural yield to be achieved at 180 °C for 60 min in the water (NaCl) /THF biphasic system. There was no significant decrease in the performance of the HfP/SiO 2 catalyst after seven consecutive cycles. Characterization analysis of the recovered catalyst revealed that its elemental composition and total acidity were maintained, indicating the desired hydrothermal stability of the HfP/SiO 2 catalyst. In addition, by-products produced during xylan conversion were identified as humins and soluble molecular fragments or polymers. Graphic Abstract
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
Journal of Environmental Sciences
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2023
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IF 6.9
Songjin Ko,Xiaolong Tang,Fengyu Gao,Honghong Yi,Hengheng Liu,Ning Luo
In this work, the phosphomolybdate (HPMo) modification strategy was applied to improve the N 2 selectivity of MnCo-BTC@SiO 2 catalyst for the selective catalytic reduction of NO x , and further, the mechanism of HPMo modification on enhanced catalytic performance was explored. Among MnCo-BTC@SiO 2 -x catalysts with different HPMo concentrations, MnCo-BTC@SiO 2 -0.75 catalyst exhibited not only the highest NH 3 -SCR performance (∼95% at 200-300°C) but also the best N 2 selectivity (exceed 80% at 100-300°C) due to the appropriate redox capacity, greater surface acidity. X-ray photoelectron spectrometer (XPS) and temperature programmed reduction of H 2 (H 2 -TPR) results showed that the modification with HPMo reduced the oxidation-reduction performance of the catalyst due to electron transfer from Mo 5+ to Mn 4+ /Mn 3+ and prevent the excessive oxidation of ammonia adsorption species. NH 3 temperature-programmed desorption of (NH 3 -TPD) results showed that the modification with HPMo could significantly improve the surface acidity and NH 3 adsorption, which enhance the catalytic activity and N 2 selectivity. In-situ diffused reflectance infrared Fourier transform spectroscopy (in-situ DRIFTS) revealed that modification with HPMo increased significantly the amount of adsorbed NH 3 species on the Bronsted acid site and C B / C L , it suppressed the production of N 2 O by inhibiting the production of NH species, the deep dehydrogenation of ammonia adsorption species. This study provided a simple design strategy for the catalyst to improve the low-temperature catalytic performance and N 2 selectivity.
研究领域:
催化化学
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环境科学
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DOI
PubMed
高影响因子
Materials
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2024
·Vol. 17
·期 17
·4325
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IF 3.1
Jinying Zhang,Xinye Wang,Jiaxing Yang,Yexiaotong Zhang
Constructing photonic crystals with core-shell structured nanoparticles is an important means for applications such as secure communication, anti-counterfeiting marking, and structural color camouflage. Nonetheless, the precise synthesis technology for core-shell structured nanoparticles at the hundred-nanometer scale faces significant challenges. This paper proposes a controlled synthesis method for core-shell structured nanoparticles using a template method. By using 100 nm diameter silica nanospheres as templates and coating them with a ferroferric oxide shell layer, SiO2@Fe3O4core-shell structured nanoparticles with regular morphology and good uniformity can be obtained. The study experimentally investigated the effects of feed amount, modifiers, temperature, and feed order on the coating effect, systematically optimizing the preparation process. Centrifugal driving technology was used to achieve structural colors in the visible wavelength range. Additionally, the method successfully created well-defined and uniform core-shell structured nanoparticles using 200 nm diameter silica nanospheres as templates, demonstrating that this controllable synthesis method can effectively produce core-shell structured nanoparticles over a wide range of particle sizes. The template method proposed in this paper can significantly improve morphological regularity and size uniformity while effectively reducing the preparation cost of core-shell structured nanoparticles.
研究领域:
材料科学
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纳米技术
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Penghan Cai,Meng Xu,Ming Wei,Tian Zhang,Fei Yao
The SiO 2 –TiO 2 superhydrophilic coatings with photocatalytic activity via heat curing over a low temperature of 100 ℃ were fabricated without a high-temperature calcination process. The effects of the composite ratio of SiO 2 and TiO 2 on the stability of the sols, different treatment processes on the crystalline morphology of TiO 2 , and different solid contents of the sols on the coating properties were investigated. The surface morphology, optical properties and mechanical properties of the coatings were characterised by a water contact angle (WCA) analyser, UV spectroscopy, scanning electron microscopy (SEM) and multiple functional tests. The experimental results demonstrated that the SiO 2 –TiO 2 coating featuring both the intrinsic hydrophilicity of SiO 2 and photophilicity of TiO 2 had the WCA up to 3.5° and exhibited good photocatalytic, self-cleaning, anti-fogging, and mechanical properties.
研究领域:
材料科学
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表面化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Tiansheng Liu,Na Liu,Shangru Zhai,Shengshuai Gao,Zuoyi Xiao,Qingda An,Dongjiang Yang
Well-ordered core/shell/shell-like Fe 3 O 4 @SiO 2 @PPy microspheres with prominent electromagnetic microwave absorption performance were successfully obtained by microemulsion polymerization method. The morphology, crystal form, functional group, magnetism and microwave absorption properties were investigated. The tailored shell thickness can be tuned from 20 to 60 nm (including SiO 2 layer) via changing the molar ratio of Fe 3 O 4 @SiO 2 to Pyrrole. The absorption peak positions gradually move to low frequency with increment of coating thicknesses. The minimum RL reached −40.9 dB at 6 GHz with the coating thickness of 5 mm. The effective absorption bandwidth could reach 6.88 GHz from 11.12 to 18 GHz, completely covering the whole K (12–18 GHz) band. Meanwhile, it showed excellent wave absorption in 4.4–18 GHz with different coating thickness. The perfect electromagnetic wave absorption properties could be attributed to the dielectric loss from the special core/shell/shell microstructure and natural resonance from the Fe 3 O 4 microspheres. These newly prepared Fe 3 O 4 @SiO 2 @PPy microspheres might be considered as prospective nominees for highly efficient microwave absorption materials with tailored nanostructures .
研究领域:
材料科学
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电磁学
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DOI
高影响因子
CHROMATOGRAPHIA
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2017
·Vol. 80
·期 3
·463-471
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IF 1.402
Xu Mei,Chen Kun,Luo Chen,Song Guoxin,Hu Yaoming,Cheng Hefa
Abstract In this paper, a simple but efficient method for the extraction and analysis of bifenthrin in water samples was proposed. The Fe 3 O 4 -based nanocomposites (Fe 3 O 4 @m-SiO 2 /PSA@Zr-MOF) were successfully synthesized and developed as adsorbents for magnetic solid-phase extraction. With the solvothermal reaction and sol–gel method, the resultant adsorbents exhibited excellent characteristics of large surface areas, homogeneous pore size, strong magnetic responsivity and high hydrophilicity. The parameters affecting the extraction performance including adsorbent amounts, adsorption time, species of eluents and desorption time were investigated. Under the optimal conditions, validation experiments such as recovery, reproducibility and limits of detection (LOD) were carried out and showed satisfactory results. The LOD of the targeted analytes was found to be 0.5 μg L −1 . The average recovery was 103.2% with the intra-day and inter-day relative standard deviations of 2.0 and 3.5%, respectively. Ultimately, the novel magnetic adsorbents were successfully applied to detect the bifenthrin compound in real water samples. Graphical Abstract
研究领域:
环境科学
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分析化学
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DOI
高影响因子
COMPOSITES COMMUNICATIONS
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2019
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IF 0
Fuhai Cui,Weidong Han,Yang Si,Wenkun Chen,Meng Zhang,Hak Yong Kim,Bin Ding
Catalytic oxidation is an efficient and cost-effective technology to eliminate HCHO, and MnO 2 shows excellent performance towards this kind of reactions. In this work, a birnessite type manganese dioxide nanoparticles modified silica-doped titanium dioxide (MnO 2 @SiO 2 –TiO 2 ) nanofibrous membranes were successfully synthesized by using an electrospinning technique and liquid phase synthesis . It is found that MnO 2 @SiO 2 –TiO 2 -4 nanofibrous membrane showed the best catalytic activity for HCHO removal. The as-fabricated nanofibrous membranes exhibited good and reversible catalytic oxidation activity towards formaldehyde, and more than 90% of the catalytic performance could remain after 5 testing cycles. The successfully constructed MnO 2 nanoparticles decorated soft SiO 2 –TiO 2 nanofibrous membranes, which can be a great promise for effectively solving the problem of environmental remediation.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2015
·
IF 3.313
Lei Wang,Pengjin Ye,Fang Yuan,Shuzhen Li,Zixin Ye
In this work, we report a novel means, named liquid phase in-situ hydrodeoxygenation of bio-derived phenol to cyclohexene and cyclohexane over Raney Ni and Nafion/SiO 2 . In this method, producing hydrogen , hydrogenation and dehydration are merged and coupled owing to the close reaction conditions. The overall specific reaction pathway was studied and influences of Nafion loading, temperature, H 2 O/MeOH ratio and the quantity of catalysts on the reaction were also researched. In terms of 3 g phenol, the suitable operating conditions are drawn as follows: the Nafion loading 13 wt%, the reaction temperature 200 °C, H 2 O/MeOH ratio 20 mL:15 mL, Raney Ni 1 g, Nafion/SiO 2 0.3 g. The conversion rate of phenol and the total yield of cyclohexene and cyclohexane can reach respectively 100% and 87%. The whole reaction system is performed in the liquid phase using in situ hydrogen produced from methanol aqueous-phase reforming, not requiring an external source of hydrogen. The operating conditions are gentle, and the cost is considerably reduced.
研究领域:
化学工程
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催化反应
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2022
·
IF 5.723
Yanhong Quan,Yuting Jin,Na Wang,Jinxian Zhao,Jun Ren
CuZn/SiO 2 lamellar catalysts are obtained through the introduction of zinc oxide with different amount to Cu/SiO 2 prepared by the ammonia-evaporation method and investigated for the dehydrogenation of methanol to methyl formate. The 20CuZn/SiO 2 catalyst showed the best catalytic activity with a methanol conversion of 44.5% and a selectivity to methyl formate of ~92.7% at 300 °C and 0.2 MPa. The reason for this excellent activity could be ascribed to the strong interaction between Cu and ZnO, which promoted the decomposition of the copper phyllosilicate precursor to release copper oxide and thereby achieved more active Cu 0 species upon reduction on the catalyst surface. In addition, the agglomeration of Cu species was mainly responsible for the slight decline in the methanol conversion in ZnO modified Cu based catalysts for the methanol dehydrogenation reaction.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Yun Li,Houfang Lu,Yingying Liu,Kejing Wu,Yingming Zhu,Bin Liang
Nano-SiO 2 was used to enhance the performance of CO 2 absorption and desorption in viscous DBU-glycerol solution with a viscosity of about 60 mPa·s. The effects of ultrasonic time in the preparation of nanofluids, solids loading and particle/cluster size of SiO 2 on absorbent properties and absorption performance were investigated. Meanwhile, the enhancements of heat transfer and mass transfer with nanoparticles in the desorption of CO 2 -loaded DBU-glycerol solutions were also analyzed. Proper ultrasonic vibration time and nano-SiO 2 loading can both decrease the average particle size in the system which can improve the absorption. The increase of interfacial area between gas and liquid with the addition of nano-SiO 2 dominates the enhancement of absorption and it has little effect on the enhancement factor when the nano-SiO 2 size is 102 nm or below. But when the particle size is higher than 102 nm, the enhancement factor decreases with the increase of particle/cluster size. The addition of 0.10 wt% SiO 2 nanoparticle with a particle size of 16 nm can increase the absorption rate by 31 % compared with base liquid. In desorption process, the desorption rate for CO 2 -loaded DBU-glycerol solutions can increase 18 % with the addition of 0.10 wt% nano-SiO 2 with a particle size of 32 nm. The main reason could be that nano-SiO 2 can improve the heating rate of the base fluid and supply plenty of nucleation sites for the formation of bubbles to improve the desorption rate. It shows that nano-SiO 2 can be used to enhance both the absorption and desorption processes in solutions with high viscosity.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qingpeng Zhu,Jiaojiao Song,Zhaofei Liu,Konglin Wu,Xiangzi Li,Zhiming Chen,Huan Pang
Efficient and convenient degradation of industrial organic pollutants are of great importance for green chemical schemes and cost-effectiveness. This work introduced the immobilization of laccase on Fe 3 O 4 @SiO 2 nanoparticles (Fe 3 O 4 @SiO 2 -laccase) for photothermal catalytic degradation of textile dyes. The Fe 3 O 4 @SiO 2 -laccase presented excellent reusability, improved thermal and pH stabilities, and remarkable organic compounds, inhibitors and metal ions tolerance. Batch experiments indicate that the maximum loading amount and activity recovery for laccase were about 10.5 mg/g and 109.7%, respectively. Meanwhile, the immobilized laccase was employed for photothermal catalytic degradation of textile dyes. The degradation assays revealed that the initial removal efficiencies were 99.6%, 99.5%, 94.6%, 94.2%, 89.4% and 79.3% for high concentrations of malachite green (MG), brilliant green (BG), reactive blue 19 (RB19), azophloxine, procion red MX-5B and alizarin red in 30–60 min illumination, respectively. Even after 10 recycling cycles, the photothermal catalytic degradation rates of the textile dyes were observed at 98.7%, 99.3%, 88.8%, 79.0%, 78.7% and 64.4%, respectively. The outstanding photothermal catalytic performances demonstrated that the Fe 3 O 4 @SiO 2 -laccase has a technical application in wastewater treatment .
研究领域:
环境科学
·
生物技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）