INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
·
IF 3.8
Juntao Tang,Taotao Zhou,Mengyi Cao,Da Wang,Zhiqiao He,Shuang Song
Electro-Fenton (EF) process is promising for achieving satisfactory oxidation of organic contaminants. However, the sluggish kinetics of in situ production of H2O2 and slow rate of Fe2+ regeneration remain its limitations. In this work, SiO2 with tunable methyl and hydroxyl moieties on the surface (MxOHSiO2; x denotes the mass ratio of diethoxydimethylsilane to tetraethyl orthosilicate) was successfully loaded onto activated carbon fiber (ACF) to construct an ACF-supported cathode (MxOHSiO2/ACF) for the degradation of bisphenol A (BPA). The MxOHSiO2/ACF exhibited substantially higher activity than bare ACF in the EF process. The removal of BPA proceeded most rapidly with M0.75OHSiO2/ACF with an initial pH of 3.0, an electrolyzing voltage of 20 V, and an Fe2+ dosage of 0.5 mM. The mineralization efficiency was 79.3% after 360 min, with the complete disappearance of BPA recorded at 60 min during the EF process. In addition, the M0.75OHSiO2/ACF catalytic electrode remained stable for five successive cycling tests. Because of the synergistic effect of the hydrophobic methyl moiety and electron-rich hydroxyl moiety on SiO2, the H2O2 electro-generation and Fe2+ regeneration at M0.75OHSiO2/ACF were simultaneously improved. This work provides an effective strategy for the application of EF technology in future.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiankai Hu,Daili Feng,Wenjun Li,Jianyin Miao,Yanhui Feng
The integration of phase change material (PCM) into aircraft thermal protection system (TPS) can dissipate aerodynamic heat by utilizing its sensible and latent heat, but there is a problem of leakage. Porous SiC ceramics with high-temperature resistance and low thermal conductivity are utilized to encapsulate high latent heat PCM, solving leakage issues and mitigating the high-temperature aerodynamic heating environment experienced by aircraft. In this study, low thermal conductivity porous SiC ceramics were prepared, where the addition of SiO 2 in the skeleton led to a 36% reduction in thermal conductivity, while the mechanical properties were improved by 129%. After loading the PCM, the thermal conductivity of the composite was only 0.402 W/(m·K), while the latent heat reached up to 231.07 J/g. Aircraft is subjected to space particles when serving in the space environment, therefore the effects of 60 Co γ-ray irradiation on composite PCMs were investigated. The results showed that irradiation induced a small number of point defects in the skeletons, which caused phase changing polyethylene glycol (PEG) molecular chain breakage and the production of new compounds, thereby inducing a decrease in the latent heat of the PEG composites, whereas there was no significant effect on the phase changing mannitol (Man) composites. This study may provide guidance for the application of composite PCMs in TPS.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Meng-Jie Chang,Ge Bai,Jun Liu,Xin Li,Hui Wang,Shu-Yi Hu,Qiu-Yu Hu,Shi-Shun Cao,Jie Yang
We presented a novel strategy to construct flexible SiO 2 nanofibrous silica aerogel (SNF/SAG) for ultrahigh oil adsorption by controlling the mechanical property of SiO 2 nanofibers (SNFs). The SNF/SAG was constructed assisted with flexible SNF template and low content methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane (DMDMS) co-precursors by sol-gel and ambient pressure drying processes. The prepared SNF/SAG is assembled with core/shell fibrous skeleton with coarse surface by hydrolyzed silica particles accumulated on the SNF surface. The ultralow density (0.0084 g cm −3 ), "Schisandra" like skeleton and hydrophobicity make the SNF/SAG possess very high oil sorption capacity up to 165.6 g g −1 of CH 2 Cl 2 . The SNF/SAG presents excellent flexibility for multiple compression without obvious deformation and crack for stable oil sorption and collection through squeezing. The significant reduction of the organic silane precursors and excellent thermal insulation properties thanks to the high porosity endow the SNF/SAG as promising material for insulation applications in a wide temperature range.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2017
·Vol. 83
·期 2
·447-456
·
IF 1.575
Mou Yongren,Kang Ming,Wang Feng,Liu Min,Chen Kexu,Sun Rong
Abstract Monodisperse core-shell structured SiO 2 @SiO 2 :Eu(DBM) 3 phen microspheres, as a new kind of fluorescent particles, were fabricated by a seeded growth method in the presence of surfactant CTAB (DBM = dibenzoylmethane, phen = 1,10-phenanthroline, CTAB = cetyltrimethyl ammonium bromide). In this way, a thin mesoporous silica shell doped with Eu(DBM) 3 phen was grown on the prepared monodisperse silica colloids. The structures of the as-prepared phosphors were characterized by means of X-ray diffraction, Fourier transform infrared spectrum, thermal gravimetric analysis–differential scanning calorimetry, field emission scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectrometry, nitrogen adsorption-desorption techniques, and photoluminescence spectra. The experimental results show that the microshpere has a typical core-shell structure with a diameter of about 370 nm, consisting of the silica colloids core with about 340 nm in diameter and mesoporous silica shell doped with europium complexes with an average thickness of about 15 nm. The as-obtained core-shell microspheres exhibit a strong red emission peak originating from electric-dipole transition 5 D 0 → 7 F 2 (610 nm) of Eu 3+ ions under the excitation of 405 nm. Additionally, the photoluminescence intensity increases with the increasing of europium complexes concentration in mesoporous silica shell, and concentration quenching occurs when europium complexes concentration exceeds 7.0 mol%. The prepared microspheres may present potential applications in the fields of optoelectronic devices, bio-imaging, medical diagnosis, and the packing structural functional composites. Graphical Abstract Monodisperse core-shell structured SiO 2 @SiO 2 : Eu(DBM) 3 phen microspheres with high lumious performance were fabricated by a seeded growth method by means of surfactant CTAB.
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Zhijia Liao,Ninghao Chu,Zhenyu Yuan,Yanbai Shen,Fanli Meng
This study successfully synthesized “silver ear-like” Co(OH)F using 15 nm SiO 2 spheres as seeds. Gas sensitivity of Co(OH)F with and without SiO 2 spheres to toluene was compared at different annealing temperatures. The results demonstrate that the Co(OH)F-Si-350 sensor exhibits optimal gas sensitivity to toluene, with a response of 35 (R g /R a ) to 100 ppm of toluene at 220℃, with response and recovery times of 50 s and 80 s, respectively. Notably, the sensor detected toluene concentrations as low as 50 ppb, indicating good sensitivity to low concentrations. These findings suggest that the structural transformation resulting from the introduction of SiO 2 nanospheres, forming ultra-thin nanosheet clusters (∼12 nm), provides abundant active sites, effectively promoting substance diffusion and adsorption/desorption processes. Additionally, the incorporation of fluorine enhances the Lewis acidity of the material, facilitating the formation of stable adsorption states for gas molecules on the surface. These results reveal the significant impact of the structural transformation caused by the introduction of SiO 2 nanospheres on gas sensitivity, providing a strong theoretical foundation for further optimizing gas sensor design.
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DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
YuXuan Xiong,Dandan Luo,Guowen He,Saiwen Liu,Jin Zhang,Chao Chen
Baicalin is a principal component of traditional Chinese medicine and plays a crucial role in treating conditions such as arthritis, respiratory tract infections, chronic and acute hepatitis, and tumors. Graphene oxide is bonded to silicon dioxide (SiO 2 ) through covalent bonds or hydrogen bonds and then reduced to SiO 2 @rGO through hydrazine hydrate to solve the problem of easy accumulation of SiO 2 and improve the conductivity of the material. Next, β-cyclodextrin (β-CD) self-assembles on SiO 2 @rGO to form a stable inclusion complex. The hydrophobic inner cavity of β-CD can effectively accommodate various guest molecules to form inclusion complexes, enhancing molecular recognition and detection capabilities. Finally, β-CD/SiO 2 @rGO is bridged and surface-loaded between clay-like Ti 3 C 2 T x (MXenes) nanosheets through electrostatic interactions to form a stable three-dimensional composite material. It is precisely because of MXenes, due to their unique layered microstructure, excellent conductivity, and extensive hydrophilic surface area, that they are conducive to self-assembly or embedding nanoparticles in aqueous solution. The composite was characterized via X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy. Under optimized conditions, the electrochemical sensor constructed from this composite exhibited a broad detection range (0.008–10 μM) and a low detection limit (0.191 nM) for baicalin. In comparison to existing methods for detecting baicalin, this approach demonstrates strong anti-interference capabilities and stability. It can efficiently, sensitively, and accurately quantify baicalin in Chinese patent medicine samples, including Scutellaria baicalensis root, Shuanghuanglian oral liquid, and Bear Bile Scutellaria baicalensis eye drops, achieving a satisfactory recovery rate. This study introduces a novel approach for the electrochemical detection of baicalin.
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高影响因子
Magnetochemistry
·
2024
·Vol. 10
·期 10
·74
·
IF 2.6
Qinqin Hu,Manman Zhang,Jiaoyu Peng,Yaping Dong,Wu Li,Lingzong Meng
In this study, amino-functionalized magnetic particles (iron oxide@SiO2-NH2) with core-shell structures were synthesized and evaluated for rapid boron removal from aqueous solutions. The results showed that the specific surface area of the iron oxide@SiO2-NH2(131.24 m2⋅g−1) increased greatly compared to pure iron oxide (30.98 m2⋅g−1). The adsorption equilibrium was less than 2 h, with an adsorption capacity of 29.76 mg⋅g−1at pH = 6 at 15 °C. The quasi-second-order kinetic model described the boron adsorption process well, and both the Langmuir and Freundlich models were suitable for characterizing the adsorption isotherms. The zeta potential and XPS analysis before and after adsorption revealed that the main adsorption mechanism was the hydrogen bonding formation between the terminal -NH2groups of the adsorbent and the boric acid. In addition, the adsorbent still maintained a high adsorption performance after five adsorption–desorption cycles, which illustrated that the iron oxide@SiO2-NH2may be a potential adsorbent for environmental boron removal treatment.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 31
·e55738
·
IF 2.7
Liangyong He,Yuqing Yang,Bin Yang,Weiqiang Hu,Zhengzhi Zheng,Tianyu Lu,Haijia He,Jiasheng Qian,Yaoyang Chen,Weiguo Zhang,Yuchao Ke
In recent years, optical diffusion film materials with high transmittance and high haze have been widely reported, while there is relatively rare research on their functionalization and practical application especially in real scenario. In this work, optical diffusion films using polymethyl methacrylate (PMMA)@TiO 2 @SiO 2 (P@T@S) composite microspheres were fabricated, which exhibited sufficiently high light transmittance and haze. The binding mode of PMMA microspheres and nanoparticles suggested that PMMA microspheres with a positive surface potential combined with nanoparticles with a negative surface potential through electrostatic attraction to achieve mutual binding. The prepared P@T@S composite microspheres showed better heat and swelling resistance than those of PMMA microspheres. The P@T@S diffusion film, whose excellent light diffusion effect was clearly demonstrated, exhibited the best optical performance among all optical diffusion films prepared. After passing through the P@T@S diffusion film, the laser light was not only uniform but also bright. The findings from this work can provide some insight into further research on optical diffusion films applied in optoelectronic device areas.
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高影响因子
ENERGY
·
2024
·
IF 9
Bingshuo Li,Aorong Ding,Tianhua Yang,Zhuo Wang,Haijun Zhang,Xingping Kai,Rundong Li
Hydrodeoxygenation (HDO) of phenols has significant potential for the synthesis of cycloalkane. In this study, a Ni-based magnetic molecular sieve catalyst, Ni/HZSM-5@SiO 2 @Fe 3 O 4 , was carefully prepared and systematically characterized using various analytical methods. A screening of the HDO reaction conditions was carried out using a typical phenolic compound of 4-ethylphenol. Under the optimal reaction conditions (240 °C, 3 h) with n-dodecane as the solvent, the 6 % Ni/HZSM-5@SiO 2 @Fe 3 O 4 catalyst showed excellent performance, achieving a 4-ethylphenol conversion of 59.3 % and an ethylcyclohexane selectivity of 85.1 %. In comparison to conventional Ni/HZSM-5, the magnetic micromesoporous molecular sieve catalyst exhibited superior catalytic activity, alkane selectivity and recyclability, with a catalyst recovery ratio of 95 %. Furthermore, the effect of liquid-solid mass transfer efficiency on the ethylcyclohexane selectivity considering of the stirring speed was studied, and the selectivity was increased from 81.6 to 85.1 % when the speed was increased from 400 to 600 rpm. This finding was further substantiated by Fluent numerical simulation. To elucidate the HDO pathway of 4-ethylphenol on Ni/HZSM-5@SiO 2 @Fe 3 O 4 , a comprehensive reaction pathway was proposed, providing insights into the catalytic mechanism.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Chenxi Feng,Junyang Liu,Kai Zhao,Lei Wang,Zengxi Li,Guoliang Zhang,Chunshan Li
Methyl methacrylate (MMA) synthesis via aldol condensation of methyl propionate with formaldehyde over Cs-based supported catalysts is intensively investigated, while the effect of their pore structures on catalytic performance still lacks in-depth understanding. Herein, series of Cs-Zr/SiO 2 catalysts with different pore structures were prepared for this aldol condensation. The physicochemical characteristics of as-prepared Cs-Zr/SiO 2 catalysts were characterized using physical N 2 adsorption–desorption isotherms and CO 2 -/NH 3 -TPD. In addition, the impact of pore structure on mass transfer, adsorption, and desorption of reactants and products was studied through in situ DRIFTS. The results show that the acid and base site densities elevated with the increasing pore volume. The mass transfer of reactants and products could be promoted with increasing pore size, while their adsorption energies exhibited a volcanic trend. As a result, the Cs-Zr/SiO 2 catalysts having average pore diameter of 12-18 nm and acid-base balance was considered as the optimal candidate for MMA production.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Liping Rong,Xiaohui Fan,Gang Wang,Huanhuan Li,Dayong Zhang,Danni Luo,Sheng Li,Zhiguo Li
Improving the bond strength of wood emulsion adhesives is an ongoing challenge for the wood-processing industry. In this study, PVAc/PS core-shell emulsion particles are functionalized by forming coordination complexes between natural biomaterial tannic acid (TA) and Fe 3+ . The functionalized emulsion particles are assembled on the surface of the core template SiO 2 to form a “superstructure” through hydrogen bonding between the phenolic hydroxyl groups in the TA and the hydroxyl groups on the surface of SiO 2 , which can enhance the cohesive strength of the emulsion adhesive layer, thereby increasing the peel strength of wood adhesives. The results indicated that the functionalized emulsion particles were most effectively assembled on core template SiO 2 particles when the ratio of TA to Fe 3+ was 1:1 and the encapsulation rate of the assembled SiO 2 particles was 150 %. The glass transition temperatures (Tg1 and Tg2), storage modulus, tensile strength, and hardness of the assembled PVAc/PS emulsion film were measured by DSC, DMA, tensile testing machine, and durometer. These properties increased by 11.6 %, 5.3 %, 14.9 %, 127.6 %, and 46.3 %, respectively, compared to those of the PVAc/PS emulsion film. Further, the shear strength of the assembled PVAc/PS emulsion for bonding wood blocks and the peel strength for bonding thin veneers increased by 33.8 and 35.7 %, respectively, compared to those of the PVAc/PS emulsion. This study confirmed that using a modular assembly to improve PVAc/PS emulsion bonding properties can help formulate high-performance waterborne emulsion adhesives with promising applications in the field of thin-wood veneer bonding. This strategy provides an effective method to design and build environmentally friendly, low-cost, and high-performance water-based emulsion adhesives.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Liyuan Zhang,Yiming Li,Feng Liu,Xiaoyu Zhang,Hongyu Chan,Yueyao Liang,Kuanjun Fang
Particulate matter (PM) contamination constituted a significant threat to both human well-being and the worldwide ecological system. However, protective masks achieved high-performance filtration of the PM by tightly stacking fibers, especially for PM 0.1 , which seriously affected the wearing comfort. Herein, a Nylon-6/SiO 2 composite fiber membrane with two-dimension (2D) narrow pore but 3D fluffy structure was designed to harmoniously combine high-performance filtration capabilities with comfort. Based on one-step multi-jet free-surface air-jet spinning and spraying, the introduction of nano-SiO 2 spheres enhanced the surface roughness of the fiber and reduced the pore size of the 2D fiber layer in the membrane structure, improving PM 0.1 particle capture. Additionally, the addition of micro-SiO 2 spheres could construct a fluffy 3D reticular architecture in the membrane, enhancing the flow of air and minimizing gas resistance during the filtration process. Due to the structural design featuring small pores and low packing density, the Nylon-6/SiO 2 -NM membrane exhibited an excellent PM removal rate of 99.99 % and low air resistance of 101 Pa at the flow rate of 32 L/min. At the flow rate of 85 L/min, the filtration efficiency of 99.9 % could be achieved, and the gas resistance was 254 Pa, the performance conformed to the GB 19083-2011. Moreover, the Nylon-6/SiO 2 -NM mask simultaneously possessed superior wearing comfort with air permeability (277.09 mm/s) and moisture permeability (196.50 g·m −2 ·h −1 ) and UV protection (UPF value of 136), as well as good thermal comfort. This research had the potential to introduce a fresh perspective on developing advanced, high-performance, and user-friendly personal protective materials.
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高影响因子
危险品化学品经营许可证（带存储）