CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
·
IF 3.898
Youwei Yang,Jingyu Zhang,Yueqi Gao,Busha Assaba Fayisa,Antai Li,Shouying Huang,Jing Lv,Yue Wang,Xinbin Ma
The efficient hydrogenation of CO 2 -derived ethylene carbonate (EC) to yield methanol (MeOH) and ethylene glycol (EG) is a key process for indirect conversion of CO 2 to MeOH. However, a high H 2 /EC molar ratio during the hydrogenation process (usually as 180–300) is generally required to achieve good catalytic performance, resulting in high cost and energy consumption for H 2 circulation in the promising industrial application. Here, we prepared a series of Ni-modified Cu/SiO 2 catalysts and explored the effects of synthesis methods and Ni contents on catalytic performance under different H 2 /EC molar ratios. The Cu/SiO 2 catalyst with 0.2% (mass) Ni loading prepared by co-ammonia evaporation method exhibited above 99% conversion of EC, 91% and 98% selectivity to MeOH and EG respectively at H 2 /EC ratio of 60. And no significant deactivation was observed within 140 h at a lower H 2 /EC of 40. It is demonstrated that a few of Ni addition could not only promote Cu dispersion and increase surface Cu + species due to the strong interaction between Cu and Ni species, but also form uniformly-dispersed CuNi alloy species and thus enhance the adsorption and dissociation of H 2 . But the excess Ni species would aggregate and segregate to cover partial surface of Cu nanoparticles , leading to a significantly drop of catalytic performance in EC hydrogenation. These insights may provide guidance for further design of catalysts for the ester hydrogenation reactions.
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高影响因子
Materials Today Energy
·
2024
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IF 9
Xiao-Jie Kang,Hui Zhang,Cheng-Yu He,Bao-Hua Liu,Yong-Zhi Zhang,Xiang-Hu Gao
Polymer-based materials emerge as promising building blocks for passive daytime radiative cooling (PDRC) due to their affordability and ease of production. Enhancing these polymers with inorganic particle doping has shown to boost their mechanical properties and light scattering ability, a result of the increased refractive index contrast with air. However, the incorporation of a single type of inorganic particle often falls short in optimizing overall performance. Herein, we introduce a novel approach by simultaneously integrating high refractive index zirconium dioxide (ZrO 2 ) and wide band gap silicon dioxide (SiO 2 ) dielectric particles into polydimethylsiloxane (PDMS) matrix. This dual-particle strategy synergistically improves the radiative cooling capabilities of the resulting photonic film. Remarkably, with a thickness of 1,000 μm, it achieves an impressive 96.7% reflection of solar irradiance , while maintaining a high emissivity of 95.2% in the atmospheric window . Under solar intensity of ∼836.7 W/m 2 , it delivers an average cooling power of 82.42 W/m 2 , achieving a substantial sub-ambient temperature drop of up to 8.26 °C. We further explored its effectiveness in enhancing freshwater collection efficiency, leveraging its radiative cooling properties. Furthermore, the photonic film also exhibits versatile properties including flexibility, hydrophobicity , thermal stability, color scalability, and weather resistance, thus enhancing its suitability for various practical applications.
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Environmental Science-Nano
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2025
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IF 5.1
Pengju Ren,Yihan Chi,Lijuan Wang,Yuanyuan Tang
This study investigated the aggregation of polystyrene (PS) NPs by kinetics experiments, considering single, simultaneous, and sequential addition of silica (SiO2) nanoparticles and metal cations. Results demonstrated that ion concentration and strength played a crucial role in determining PS stability across all systems. Surface interaction forces, particularly van der Waals forces, were fundamental mechanisms for PS aggregation. In simultaneous addition system, SiO2 improved PS stability. The higher the concentration of SiO2, the more significant its stabilizing effect on PS, as SiO2 competed with PS for metal cations. DLVO calculations and zeta potential analyses suggested that electric double layer repulsion was primary factor behind PS stabilization by SiO2. Additionally, other non-DLVO forces, such as hydrogen bonding and π-π interactions, might also affect the stabilization. SiO2 was found to promote PS aggregation in the sequential addition system, contrasting with its stabilizing effect in the simultaneous addition system. The increase in aggregate size was primarily attributed to the bridging effects, though the enhanced electrostatic repulsion prevented a substantial rise in aggregate size. This study highlights how the presence of non-plastic particles influences the environmental behavior of NPs and deepens our understanding of the interactions between PS NPs and SiO2 in complex and realistic aqueous environments.
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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
Long Cheng,Kui Wang,Shanyong Wang,Hailong Lu,Chunmin Xu,Jun Ye
As the main by-product of chemical pulping, lignosulfonate is mostly burned directly as fuel with low added value. Therefore, the conversion of lignosulfonate into multifunctional porous carbon materials is necessary for green sustainable development and practical applications. In this work, the pore size of sodium lignosulfonate-based porous carbons (LBCs) was regulated by green activator HCOOK and mesoporous manufacturing agent SiO 2 for the first time. The formation of micropores is beneficial to the improvement of surface area and adsorption performance, while the development of mesopores accelerates the mass transfer rate, but its adsorption performance is lower than that of micropores. The developed pore structure, sufficient oxygen content and graphene structure of LBCs lead to high adsorption performance for norfloxacin (NOR), reaching 341.9 mg g −1 . Characterization and Density functional theory (DFT) results show that the sorption process includes pore filling, π-π stacking, hydrogen bond and electrostatic interaction. In addition, pore volume and surface diffusion model (PVSDM) confirm that surface diffusion dominates the adsorption process. The above results provide an important reference value for the preparation and application of high-performance lignin-based adsorbents.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Cuirong Yan,Hongyan Ma,Xiunan Cai,Zhongqiu Luo,Jinyu Shi,Wenhao Li,Xintao Zhou
High-valent iron-oxo complexes show promise as green oxidants for water remediation, but suffer from critical limitations in stability and pH adaptability. Herein, we report a facile method to synthesize amorphous SiO 2 -stabilized high-valent iron-oxo complexes via Na + diffusion activation of iron/silicon-rich copper smelting slag. In the complex, the synergistic coexistence of two distinct silica‑oxygen tetrahedral configurations-basic Na 2 SiO 3 and acidic SiO 2 oxides establishes a self-regulating pH buffering system that stabilizes solution neutrality. This unique structural design ensures sustained oxidative activity of the complex, representing a significant advancement over conventional silica-supported catalysts due to its intrinsic acid-base regulatory capability. Thus, the deactivations of the oxidants including the proton-induced self-decomposition and the hydrolysis of iron by hydroxyl groups can be efficiently inhibited, thereby expanding the pH applicability (3–11). High-valent iron species can be continuously regenerated during peroxymonosulfate (PMS)-triggered reactions for the selective and efficient oxidation degradation of tetracycline hydrochloride (TC, 98.01% in 15 min) via non-radical pathway. Through methyl phenyl sulfoxide-directed oxidation, electron spin resonance, Mössbauer spectroscopy, and density functional theory calculations, the stabilizing mechanism of silicon was elucidated, confirming that the high valent iron-oxo act as the dominant active species. This work advances both hazardous waste valorization and high valent iron-oxo complex engineering, offering a robust solution for organic pollutant removal in complex aquatic environments.
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高影响因子
GREEN CHEMISTRY
·
2025
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IF 9.2
Man Yang,Shuhao Qin,Youchang Yang,Mingmi Wu,Ting Lei,Yufei Liu,Huiju Shao
Owing to the global transition toward carbon neutrality, lithium-ion batteries (LIBs) are experiencing unprecedented demand growth as key energy storage components. A contact-electro-catalysis (CEC) method has been utilized in recycling spent LIBs for some time due to the process economy, efficiency and environmental sustainability. However, systematic investigations into the effects of the microstructure and surface chemical environment of dielectric materials on their catalytic activity in the CEC process remain scarce. Here, we demonstrated that the metal leaching efficiency simultaneously depended on the size and porous structure of SiO2 microspheres. Appropriate size and narrow distribution could dominantly diminish the scattering intensity of ultrasonic waves to gather energy and then facilitate the formation of cavitation bubbles to generate abundant electrons and radicals. Similarly, the porous structure also promoted the generation of electrons and radicals by enhancing aqueous-phase contact interfaces. Moreover, we manipulated the surface chemical environment of porous SiO2 microspheres by incorporating sodium alginate (SA) and polyethyleneimine (PEI). Hydroxyl, carboxyl and amino groups and –COO−/–NH3+-microstructures not only accelerated electron transfer from water molecules to SiO2 microspheres, inducing hydroxyl radicals, but also boosted electron transfer from SiO2 microspheres to O2, generating superoxide radicals. Consequently, under the experimental conditions established in this study, approximately 100% leaching efficiency of metals in the spent ternary cathode was achieved in 8 h at 80 °C due to the synergistic effect of hydroxyl and superoxide radicals. We anticipate this innovative strategy will significantly expand the applicability of CEC in LIB recycling, thereby addressing the growing global demand for sustainable LIBs.
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COMPOSITES PART B-ENGINEERING
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2025
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IF 14.2
Youquan Ling,Junjie Liu,Bolin Xiao,Hui Jin,Luxiang Zhao,Yanjiang Bai,Xi Zhang,Mei Liang,Yang Chen,Huawei Zou
In this study, carboxymethyl cellulose (CMC), a polymer abundant in hydroxyl and carboxyl groups, was employed as an interfacial layer between polyimide fibers and EPDM rubber. The formation of hydrogen bonds between CMC and the polyimide fibers facilitated a robust encapsulation of CMC on the fiber surface. Additionally, a greater number of SiO 2 nanoparticles were adsorbed onto the CMC surface through hydrogen bonding and condensation reactions, significantly enhancing the fiber's surface roughness and the matrix's wettability. This strong mechanical interlocking structure markedly improved the interfacial adhesion and mechanical properties of the composites. Specifically, the H pull-out force, tensile strength, and elongation at break increased by 84.8 %, 89 %, and 45 %, respectively, compared to the control samples. In-situ electron microscopy further confirmed that the reinforced interface effectively inhibited crack propagation along the interface. Low-field NMR analysis revealed that the enhanced interfacial bonding restricted the mobility of rubber molecules, contributing to higher strains and stresses during the orientation hardening phase under tension. Moreover, the improved interfacial adhesion and the incorporation of SiO 2 within the interfacial layer also enhanced the ablative resistance and thermal insulation properties. These findings demonstrate that the CMC/SiO 2 encapsulation strategy represents an environmentally friendly, rapid, and efficient interfacial modification method for polyimide fiber-reinforced EPDM insulation materials.
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APPLIED CATALYSIS A-GENERAL
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2022
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IF 5.723
Ke Zhang,Yijie Su,Guiyun Wang,Daolai Sun,Satoshi Sato
Vapor-phase dehydration of 1,2-propanediol to form propanal was performed over H 3 PO 4 /SiO 2 catalyst with Brønsted acid sites, which exhibited a high activity for the formation of propanal , and the successive modification of H 3 PO 4 /SiO 2 by WO 3 and Ag could further improve both the activity and the stability of catalysts. The H 3 PO 4 /SiO 2 catalyst modified by both Ag and WO 3 could provide a propanal selectivity of 94.6% with a complete conversion of 1,2-propanediol in an H 2 flow at 250 °C and a weight hourly space velocity of 2.70 h −1 . Brønsted acid sites were effective for the formation of propanal, and the doping of WO 3 could significantly increase the amount of Brønsted acid sites, resulting in the improvement of catalytic activity. On the other hand, the doping of Ag could protect the Brønsted acid sites and inhibit coke deposition on the catalyst surface in an H 2 atmosphere, leading to the improvement of catalyst stability.
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高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 13
·7644-7653
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IF 10.733
Jingyi Wu,Na You,Xiongwei Li,Hongxia Zeng,Shuai Li,Zhigang Xue,Yunsheng Ye,Xiaolin Xie
This study introduces an improved design of interlayers to achieve a balance between high Li+ diffusion and polysulfide inhibition in lithium–sulfur batteries. The design involves encapsulating mesoporous SiO2 nanospheres in few-layer MoS2 nanosheets via a facile one-step self-assembly to form a core–shell nanocomposite (SiO2@MoS2). The SiO2@MoS2 layer overlaid on a sulfur cathode simultaneously intercepts polysulfides and ensures rapid Li+ diffusion. Few-layer MoS2 as the shell is capable of breaking up polysulfides by a catalytic reaction, while mesoporous SiO2 as the core allows for physiochemical adsorption of such species; moreover, the densely packed hermetic SiO2@MoS2 nanocomposite layer provides an additional physical shield against polysulfide diffusion, realizing the full protection of the whole cathode. At the same time, the high Li+ density in the nanolayered MoS2 shell and the additional Li+ pathways created by the mesoporous SiO2 core allow for fast Li+ diffusion. Thus, a pristine sulfur cathode battery with a SiO2@MoS2 interlayer exhibits an outstanding electrochemical performance with a negligible capacity decay of 0.028% per cycle over 2500 cycles. The core–shell design suggested in this study could be extended to other nanomaterials for the optimization of Li–S battery interlayers.
研究领域:
材料科学
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储能
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纳米技术
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电化学
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
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IF 6.9
Xiaofang Wen,Hongcan Lou,Zheng Li,Jiehao Xie,Zirui Qin,Xingkun Chen,Yuan Tan,Nian Lei,Wei Lu,Yunjie Ding
The development of efficient catalysts for the selective hydrogenation of dimethyl oxalate (DMO) to high-value oxygenates is of great industrial importance. This study presents a systematic investigation into the promotional effect of gallium (Ga) on Cu/SiO 2 catalysts for tailoring product selectivity in DMO hydrogenation. A series of Ga x Cu 30 /SiO 2 catalysts with varying Ga loadings (x = 0.5, 1, 3 wt%) were synthesized via the ammonia evaporation method. With a moderate Ga doping of 0.5 wt%, the Ga 0.5 Cu 30 /SiO 2 catalyst achieved an exceptional ethylene glycol (EG) yield of 74 %, which is three times higher than its Ga-free counterpart (23 %). Further increases in Ga loading to 1 and 3 wt% redirected the reaction pathway, steering the selectivity towards ethanol (ET, 81 %) and 2-methoxyethanol (MT, 54 %), respectively. Characterization by N 2 O titration, XRD, XPS, in situ FT-IR and H 2 -TPR revealed that Ga incorporation fine-tunes the synergy between metallic Cu 0 (for H 2 dissociation) and Cu + sites (for C=O bond polarization). Concurrently, the generated surface acid sites facilitate subsequent dehydration and hydrogenolysis steps. Consequently, the catalytic performance is directly correlated with the evolution of Cu valence states and surface acidity. This work provides a rational strategy for designing multifunctional catalysts for the selective synthesis of target chemicals from DMO.
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MATERIALS CHARACTERIZATION
·
2026
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IF 6.2
Yuexing Chen,Xiang Ji,Chengshan Ji,Zhichao Shang,Tianyu Liu,Xuanru Ren,Jiaqi Zhu
In situ SiO 2 shells pre-establish oxygen-barrier networks in ZrB 2 -SiC coatings. • Core-shell ZrB 2 @SiO 2 improves interfacial continuity and particle packing. • Pre-positioned SiO 2 accelerates early-stage oxygen-barrier formation. • ZrO 2 and ZrSiO 4 dispersoids stabilize the borosilicate glass matrix. • ZrB 2 @SiO 2 -SiC lowers mass gain by 69% and gives 99.82% protection. Conventional ZrB 2 -based coatings rely on amorphous phases generated during oxidation to seal coating defects, which delays the establishment of an effective oxygen barrier. Here, an amorphous SiO 2 shell was constructed in situ on ZrB 2 particles through a sol-gel process, and the resulting core-shell powders were combined with SiC to prepare ZrB 2 @SiO 2 -SiC coatings. SiO 2 -free ZrB 2 -SiC and mechanically mixed ZrB 2 -SiO 2 -SiC were used as reference systems to distinguish the effect of SiO 2 incorporation from that of the core-shell configuration. Compared with the mechanically mixed system, the shell-derived phase became interconnected along ZrB 2 particle boundaries during sintering, improving interfacial continuity and suppressing particle agglomeration. During oxidation, this pre-connected SiO 2 phase combined with B 2 O 3 and SiO 2 generated by the oxidation of ZrB 2 and SiC, respectively, to promote the rapid formation and subsequent replenishment of a borosilicate glass network, while dispersed ZrO 2 and ZrSiO 4 helped preserve the continuity and structural stability of the resulting oxide scale. At 1973 K, this structure reduced the maximum mass gain to 0.62 × 10 −2 g·cm −2 , about 69% lower than that of the SiO 2 -free ZrB 2 -SiC system, and decreased the initial oxygen permeability by 83.23%, with the protection efficiency ultimately reaching 99.82%. This work provides an interface pre-encapsulation route for constructing continuous oxygen-barrier networks in ultra-high-temperature ceramic coatings.
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ACS Applied Materials & Interfaces
·
2026
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IF 7.8
Qianqian Chen,Mengyu Li,Zhiguang Yang,Zexiang Liu,Zhirong Nie,Chenxue Yao,Bo Ouyang,Zhiwei Zhao,Sankui Xu,Bingbing Fan,Xiaochen Li
Metal–organic framework (MOF)-derived carbon-based composites have emerged as promising candidates for high-performance electromagnetic wave (EMW)-absorbing materials, yet the atomic-scale mechanism linking compositional doping to EMW energy dissipation remains to be clarified. Herein, core–shell SiO2@Ni–Co/CNTs composites were fabricated via epitaxial Zeolitic imidazolate frameworks (ZIF) growth on monodisperse SiO2 microspheres (∼1 μm) and controlled pyrolysis, focusing on the Ni-doping-driven charge rearrangement and synergistic mechanism. Material characterizations confirmed the well-defined core–shell structure, while electromagnetic analysis showed the optimized SiO2@Ni–Co/CNTs-2 sample achieved ultrastrong performance: minimum reflection loss (RLmin) of −61.21 dB at 1.85 mm, ultrabroad effective absorption bandwidth (EAB) of 6.64 GHz (11.36–18 GHz) at 2.09 mm, and 25.5 dB radar cross-section (RCS) reduction at 60°. Crucially, off-axis electron holography visualized interfacial charge accumulation, and DFT calculations quantified Ni-induced charge rearrangement, which intensifies dipole/interfacial polarization to dielectric loss enhancement. Combined with the optimized bimetallic magnetic resonance, this charge rearrangement drives a powerful synergistic effect that maximizes EMW attenuation. This work clarifies the “charge rearrangement-synergistic loss” link and provides a “structure-composition-charge-function” design paradigm for high-performance EMW absorbers.
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PubMed
高影响因子
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