Journal of Energy Storage
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2023
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IF 9.4
Min Li,Fan Luo,Xianghui Liang,Shuangfeng Wang,Xuenong Gao,Zhengguo Zhang,Yutang Fang
Building materials with the dual function of temperature and humidity regulation can improve people's living comfort and reduce energy consumption. In this work, a simple and convenient strategy for building a comfortable indoor temperature and humidity environment was proposed. The phase change humidity control material (PCHCM) was prepared by the mixing of form-stable composite phase change material (CPCM) as temperature-control component and hygroscopic MIL-100(Fe) as humidity-control component. In PCHCM, the CPCM was obtained by molten recombination of myristic acid, tetradecanol, and capric acid (MA-TD-CA) as phase change material and hydrophilic fumed silica (SiO 2 ) as porous carrier, and MIL-100(Fe) was synthesized by low-temperature solution method. Thermal analysis indicated that, under the optimized mass ratio of 28.8%MA-61.2%TD-10%CA, the CPCM containing 30 % SiO 2 could effectively prevent the leakage of ternary eutectic , with a suitable phase change temperature and enthalpy (21.74 °C, 96.70 J·g −1 ). The thermal and wet performance evaluation confirmed that the PCHCMs containing 40–50 % CPCM had human body comfortable phase change temperature (26.96–27.26 °C) and high saturation adsorption capacity (0.179–0.205 g/g) at 60 % RH as well as outstanding thermal and wet cycle reliability, indicating the novel MA-TD-CA/SiO 2 /MIL-100(Fe) PCHCM has broad application potential in room temperature and humidity control and building energy conservation .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Ahmed Saud Abdulhameed,Ruihong Wu,Salis Auwal Musa,Hasan M. Agha,Zeid A. ALOthman,Ali H. Jawad,Sameer Algburi
In this study, chitosan/nano SiO 2 (CTS/NS) was chemically modified with bisphenol A diglycidyl ether (BADGE) cross-linker-assisted hydrothermal process to create an effective adsorbent, CTS-BADGE/NS, for the removal of reactive orange 16 (RO16) dye from aquatic systems. Box-Behnken design (BBD) was used to optimize the adsorption process by varying the adsorbent dose (0.02–0.1 g/100 mL), pH (4–10), and time (20–360 min). The adsorption isotherm results indicated that the Langmuir model fits the experimental data well, suggesting that the adsorption process involves a monolayer formation of RO16 on the surface of CTS-BADGE/NS. The kinetic modeling of RO16 adsorption by CTS-BADGE/NS demonstrated that the pseudo-first-order model fits the adsorption data. CTS-BADGE/NS achieved an adsorption capacity of 97.8 mg/g for RO16 dye at optimum desirability functions of dosage 0.099 g/100 mL, solution pH of 4.44, and temperature of 25 °C. Overall, the π-π electron donor-acceptor system significantly improved the adsorption performance of the CTS-BADGE/NS. The results of the regeneration investigation demonstrate that the CTS-BADGE/NS exhibits effective adsorption of RO16, even after undergoing five consecutive cycles. The results of this study suggest that the developed CTS-BADGE/NS composite can be a promising adsorbent for water purification applications.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 4
·697-704
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IF 3.1
Meng Chenchen,Huang Min,Li Yunchao
Covellite copper sulfide nanocrystals(CuS NCs) are typical p-type semiconductors, showing strong optical absorption in the near-infrared(NIR) region thanks to their notable localized surface plasmon resonance(LSPR) properties. However, their LSPR properties and compositions are both highly susceptible to the external environment, which severely limits their practical applications. Until now, it remains a technical challenge to improve the structural and optical stability without sacrificing the LSPR performance of CuS NCs. Herein, to solve such a challenge, CuS@SiO 2 NPs with various silica shell thicknesses(CSNs- X nm) were synthesized in a well-controlled fashion via optimizing reverse microemulsion coating protocol. Compared with the pristine CuS NCs, the as-prepared CuS@SiO 2 NPs exhibited comparable LSPR properties but much higher photostability, enabling resistance to various harsh environments( e.g. , high-power irradiation, strong reduction, and oxidation environment). Impressively, when used in solar-driven interfacial water evaporation, all the CuS@SiO 2 NPs exhibited excellent water evaporation performance with efficiencies beyond 70%(as high as 75.2% for CSN-23 nm) after 20 continuous testing cycles. Evidently, this paper is greatly helpful in better designing and fabricating high-performance plasmonic materials for practical photoelectrical, photothermal, and photocatalytic applications.
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ANALYST
·
2023
·Vol. 149
·期 4
·1160-1168
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IF 4.2
Yahui Zhang,Haifeng Yao,Yongping Dong
The poor solubility of iridium complexes severely hampers its application in the electrochemiluminescence (ECL) sensing field. The doping of an iridium complex with silica (SiO2) nanospheres provides feasible solution for this problem. Herein, one kind of water insoluble iridium complex ([Ir(dFppy)2(d(CF3)bpy)](PF6)) was doped with SiO2 nanoparticles to obtain a luminescent nanocomposite (SiO2@Ir) which could generate strong ECL signals to act as a beacon molecule. An “off–on–off” mode ECL sensor was proposed based on the competitive host–guest interactions between 2-adamantanamine (2-ADA), ferrocene (Fc) and cucurbit[7]uril (Q[7]). Fc could be used as an inhibitor to decrease the ECL signal, while Q[7] could wrap Fc to recover the ECL signal. Q[7] has a stronger binding ability with 2-ADA than Fc. As a result, 2-ADA could replace Fc from the cavity of Q[7], and the ECL signal was inhibited again. Under the optimal conditions, the ECL intensity varied linearly with 2-ADA concentration in the range of 1.0 × 10−8 to 1.0 × 10−6 mol L−1 with a detection limit of 2.5 × 10−10 mol L−1. The results not only provided a new avenue for the application of water insoluble iridium complexes in ECL sensing, but also revealed the attractive potential of host–guest interactions in the fabrication of biosensors.
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Journal of Water Process Engineering
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2023
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IF 7
Shuangli Li,Yu Zhang,Sen Qiao,Jiti Zhou
Although MIL-101(Fe) has a homogeneous distribution of active metal sites, the relatively low stability of its coordination bonds limits its potential for application, especially in harsh environments. Here, a novel lanthanum-doped MIL-101(Fe)-NH 2 @mesoporous SiO 2 yolk-shell (LMFN-YS) material, synthesized by green water-etching, has effectively improved the adsorption capacity and stability of MIL-101(Fe)-NH 2 . Compared to traditional acid-base etching methods, water etching offered a more co-friendly and cost-effective approach to producing yolk-shell structures. Due to the mesoporous protective shell of mesoporous SiO 2 and more exposed active sites, the yolk-shell materials showed a faster adsorption rate (30 min) and a larger uptake capacity (240.0 mg P/g) than those of MIL-101. The material also exhibited broad range of pH stability from 2 to 10 and displayed good cyclic regeneration ability, with a removal efficiency of 75.9 % after three cycles. Additionally, it demonstrated excellent selectivity towards various coexisting anions such as Cl − , NO 3 − , SO 4 2− , CO 3 2− and HCO 3 − at diverse ionic strengths ranging from 0.001 to 1 M. The superior performance of L 1 MFN-YS (yolk-shell materials of La: Fe = 1:1) was attributed to a combination of factors, including ligand exchange between La(Fe)-OH and phosphates, Lewis acid-base interaction and electrostatic attraction. Additionally, high phosphate removal performance was observed in the real petrochemical wastewater (initial concentrations of 5.48 mg P/g) with a residual effluent concentration of 0.05 mg P/L, which was below the A-level standard of phosphate effluent in China (0.5 mg/L). This work provides a green method for preparing yolk-shell materials with improved ability to treat phosphate wastewater.
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ULTRASONICS SONOCHEMISTRY
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2023
·
IF 8.4
Deming Zhao,Yiting Liu,Chunxin Wu
The research on developing a purification technology for Cr(Ⅵ) polluted water with high efficiency and the low energy consumption is crucial for achieving several Sustainable Development Goals (SDGs). In order to achieve these goals, Fe 3 O 4 @SiO 2 -APTMS nanocomposites were prepared by Fe 3 O 4 nanoparticles modified with silica and 3-aminopropyltrimethoxysilane in the presence of ultrasonic irradiation. The nanocomposites were characterized by TEM, FT-IR, VSM, TGA, BET, XRD, XPS and these analytic results proved that the nanocomposites were successfully prepared. The influential factors of Fe 3 O 4 @SiO 2 -APTMS on Cr(Ⅵ) adsorption have been explored and better experimental conditions have been obtained. The adsorption isotherm conformed to the Freundlich model. Pseudo-second-order kinetic model provided a better correlation for the experimental data compared to other kinetic models. Thermodynamic parameters for adsorption indicated that the adsorption of Cr(Ⅵ) was a spontaneous process. It was speculated that the adsorption mechanism of this adsorbent includes redox, electrostatic adsorption and physical adsorption. In summary, the Fe 3 O 4 @SiO 2 -APTMS nanocomposites were of great significance to human health and the remediation of heavy ion pollution, contributing to achievement of the Sustainable Development Goals (SDGs), including SDG-3, SDG-6.
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高影响因子
Polymers
·
2023
·Vol. 15
·期 6
·1579
·
IF 5
Deling Li,Congcong Luo,Jun Zhou,Liming Dong,Ying Chen,Guangtian Liu,Shuyun Qiao
Corn starch was plasticized by glycerol suspension in a twin-screw extruder, in which the glycerol suspension was the pre-dispersion mixture of glycerol with nano-SiO2. Polylactide (PLA)/thermoplastic starch/SiO2composites were obtained through melt-blending of PLA with thermoplastic starch/SiO2in a twin-screw extruder. The nonisothermal crystallization behavior of PLA in the composites was investigated by differential scanning calorimetry. An interface of PLA with thermoplastic starch was proven to exist in the composites, and its interfacial bonding characteristics were analyzed. The interfacial binding energy stemming from PLA with thermoplastic starch exerts a significant influence on the segmental mobility of PLA at the interface. The segmental mobility of PLA is gradually improved by increasing interfacial binding energy, and consequently, the relative crystallinity on the interface exhibits progressive promotion. The Jeziorny model could well describe the primary crystallization of PLA in the composites. The extracted Avrami exponents based on the Jeziorny model indicate that the primary crystallization of PLA follows heterogeneous nucleation and three-dimensional growth. This study has revealed the intrinsic effect of the interfacial segmental mobility on the nonisothermal crystallization behavior of PLA in composites, which is of technological significance for its blow molding.Keywords:polylactide;composites;interfacial binding energy;nonisothermal crystallization kinetics
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Xiao-Qiong Wu,Zai-Dong Shao,Qing Liu,Zongli Xie,Fei Zhao,Yu-Ming Zheng
Semiconductor photocatalysis has long been considered as a promising approach for remediation of polluted water. However, the high recombination rate of electrons and holes, as well as a low reaction rate, have impeded its large-scale applications. Therefore, it is of great importance to develop appropriate photocatalysts for promoting its practical application. In this study, a novel TiO 2 /SiO 2 /carbon electrospun nanofiber mat (TSC NFM) with flexibility and porous hierarchy has been successfully designed and fabricated by a facile method of electrospinning and carbonization . Characterization results show that the TSC NFM consists of closely-packed and well-distributed anatase (TiO 2 ) nanocrystals , amorphous SiO 2 nanoparticles , and carbon with interconnected meso - and macro -pores. The photocatalytic performance of the TSC NFM was evaluated by degrading rhodamine B and 4-nitrophenol in batch systems. The results show that TSC NFM exhibits a higher photocatalytic activity than TiO 2 /SiO 2 nanofiber mat, which does not contain carbon. The enhanced performance of the TSC NFM can be attributed to the improved adsorption capacity toward the organic pollutants due to the presence of carbon and to the enhanced interfacial charge separation between TiO 2 nanoparticles and carbon. Besides, the as-prepared TSC NFM displays good stability and reusability. Notably, the flexible TSC NFM can be used in a continuous-flow reactor to efficiently treat wastewater. Our work provides new insights into the fabrication of carbon-based inorganic nanofiber mats, which have great potential in water treatment.
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APPLIED SURFACE SCIENCE
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2018
·
IF 4.439
Junsong Fu,Mengjie Zhang,Lin Jin,Liu Liu,Na Li,Lei Shang,Ming Li,Linghan Xiao,Yuhui Ao
To enhance the interfacial properties of carbon fibers (CFs) reinforced epoxy composites without sacrificing fiber strength. A facile and effective Layer-by-Layer (LbL) self assembly method was proposed to deposit graphene oxide/silica (GO/SiO 2 ) multilayers films onto CFs surface. The negatively charged GO and positively charged SiO 2 can be assembled on the surface of fiber based on electrostatic interactions. Surface microstructures of CFs were characterized systematically. Scanning electron microscopy (SEM) revealed the GO/SiO 2 multilayers films compact and homogeneous coverage onto CFs surface. This coverage significantly increases the roughness and surface energy of the fibers, improving the wettability and mechanical interlocking between fibers and resin. The optimal interfacial shear strength (IFSS) of composites with 5 layers (CF-L5) was 84.40 MPa, which increased by 86.1% compared to that of Untreated-CF composites (45.36 MPa), and the interlaminar shear strength (ILSS) of CF-L5 composites (76.34 MPa) increased by 89.3% compared to that of Untreated-CF composites (40.33 MPa). In addition, the flexural strength of CF-L5 composites (765.57 MPa) was 30.4% higher than that of Untreated-CF composites (587.19 MPa). The fractured surface, energy dispersive spectroscopy (EDS) mapping and dynamic mechanical properties of CFs composites also show a great improvement in interfacial adhesion. Moreover, the tensile strength (TS) of single fiber increased from 3.52 GPa to 3.68 GPa after LbL assembly of GO/SiO 2 . Our work suggested that such LbL self assembly is a green and promising approach toward preparing high interfacial properties in CFs composites.
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ACS Applied Energy Materials
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2019
·
IF 0
Zhao Jiang,Shuyi Guo,Tao Fang
The design and development of catalysts for dodecahydro-N-ethylcarbazole (12H-NECZ) dehydrogenation restrict the achievement of the cyclic hydrogenation/dehydrogenation process. In this work, the M/SiO2 (M = Pt, Pd, Ru, Rh, Au) and bimetallic PdAu/SiO2 catalysts are prepared, and their catalytic performances are measured. By XRD, XPS, HRTEM, and CO pulse chemisorption, we find that the alloy structure is not generated and the average particle size increases with the improvement of the Au amount in the bimetallic catalysts. Besides, the catalytic performance can be enhanced dramatically with introducing a small amount Au. Pd3Au1/SiO2 exhibits the best catalytic performance with the complete conversion, 94.9 selectivity to NECZ, and 5.7 wt % hydrogen release amount. The TOF values are up to 240.7 min–1, 2.26 times higher than that of Pd/SiO2. The qualitative and quantitative analyses indicate that 4H-NECZ dehydrogenation is the rate-limiting step. It can be proposed that controlling the particle size and dispersion of the PdAu/SiO2 bimetallic catalysts will bring a significant enhancement of catalytic performance.
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COMPOSITES SCIENCE AND TECHNOLOGY
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2018
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IF 5.16
Jun Zhang,Chaowei Li,Cuiping Yu,Xiaona Wang,Qiulong Li,Huifen Lu,Qichong Zhang,Jingxin Zhao,E. Songfeng,Ming Hu,Yagang Yao
The interface plays a key role in determining the properties of polymer composites . However, chemical inertness of hexagonal boron nitride (h-BN) makes its surface modification troublesome. In this study, we, for the first time, used SiO 2 as the modified molecular and investigated the effects of exfoliated h-BN and SiO 2 nanoparticles-modified-exfoliated h-BN (SiO 2 @exfoliated h-BN) on the storage modulus , the glass transition temperature , the filler dispersion and the thermal conductivity of polyvinyl alcohol (PVA) composites prepared by a solution mixture method. The results showed that the SiO 2 modification enhanced the interface interaction and improved the performance of the PVA composites. Based on the enhanced interface interaction by SiO 2 modification and the aligned fillers in PVA by vacuum filtration, the high thermal conductivity of 13.88 W/m·K was realized at 15.2 wt% SiO 2 @exfoliated h-BN loading. Meanwhile, the tensile strength was also largely improved to 156 MPa, compared with 47 MPa of pure PVA. This study broadens the surface modification method of h-BN and provides a valuable reference for fabrication of high-performance thermal interface materials .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Qibin Xu,Lei Wang,Chen Li,Xudong Wang,Cuicui Li,Yatian Geng
In order to improve the proton conductivity and anti-fouling of proton exchange membrane (PEM) in microbial fuel cells , the present study prepares a novel composite proton exchange membrane. First, silicon dioxide (SiO 2 ) is inserted into sulfonated graphene oxide (SGO) by in situ hydrolysis using ethyl orthosilicate as precursor. Then, the obtained SGO@SiO 2 is blended with homopolymer poly(-vinylidene fluoride) grafted sodium styrene sulfonate (PVDF-g-PSSA). The effects of particles on the physicochemical properties and anti-fouling properties of the composite membrane are investigated. The best performance is obtained when the addition of SGO@SiO 2 is 1.0%. The ion exchange capacity reaches 1.6 meq/g and the proton conductivity is 0.078 S/cm, which is higher than Nafion-117 membrane. The anti-fouling ability of composite membrane gets stronger based on the quartz crystal microbalance with dissipation (QCM-D) result. The power density of microbial fuel cell with SGO@SiO 2 /PVDF-g-PSSA membrane is 185 mW/m 2 after operating one month, which is superior to SGO/PVDF-g-PSSA and PVDF-g-PSSA membrane. The improvement shows that SGO@SiO 2 /PVDF-g-PSSA membrane could be a feasible alternative to costly membrane and have potential for application in microbial fuel cell.
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危险品化学品经营许可证（带存储）