SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Heijin Chen,Feng Yan,Xianfeng Jiao,Hao Wu,Xiaoyu Liang,Xuehua Shen,Hongzhao Fan,Zuotai Zhang
Solid amine adsorbent is recognized as an efficient CO 2 capture route for globe climate change mitigation. The pore structure of nano supports generally plays a crucial role in the CO 2 adsorption performance of solid amine adsorbents; however, the involving of costly and toxic pore-expanding agents limited their scalable application. Herein, an azeotropic-distillation nano-SiO 2 (AD-SiO 2 ) support was recycled from coal fly ash (CFA) using the CO 2 -assisted precipitation and n-butanol AD methods, and possessed a super pore volume of 2.52 cm 3 ·g −1 and an average pore size of 36.6 nm. After impregnating the triethyltetramine, tetraethylenepentamine, pentaethylenehexamine (PEHA), or polyethyleneimine, the synthesized amine@AD-SiO 2 adsorbents achieved the excellent adsorption capacity of 3.50–6.13 mmol·g −1 and the fast adsorption kinetics, owing to the superior pore structure of AD-SiO 2 support. Based on the viscosity, TGA and liquid-NMR characterization, we explained that the large amine molecule would block the CO 2 diffusion channel and thus restrict the active sites, while the small amine molecule would evaporate during the regeneration process. Inspiringly, the PEHA@AD-SiO 2 adsorbent possessed the excellent cyclic stability with merely 0.18 % decay per cycle and achieved a final CO 2 uptake of 4.24 mmol·g −1 over 50 cycles. This study notably improved the long-term adsorption capacity of solid amine adsorbents via the pore-expanded AD-SiO 2 support from CFA, thereby is a low-carbon technology for large-scale industrial CO 2 capture.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Jingyi Wang,Guangzhi He,Chunying Wang,Xudong Chen,Xiaofeng Liu,Yaobin Li,Wenpo Shan,Hong He
Modulating the electronic metal-support interaction (EMSI) is one of the effective means to promote catalytic activity because it can adjust the electron occupancy of the d -band of noble metals, further facilitating the activation of reactants. Herein, we prepared a Pt/SiO 2 catalyst with an ultralow Pt loading of 0.05% and found that its catalytic activity in HCHO oxidation outperformed that of the Pt/TiO 2 counterpart, owing to the EMSI effect between Pt and SiO 2 . On this basis, the alkali metal Na was used as a promoter, and the formation of highly active Pt-O x (OH)-Na clusters enabled the complete oxidation of HCHO at room temperature. With ultralow Pt loading, the Pt-Na/SiO 2 catalyst reduces the cost of practical application remarkably. In situ DRIFTS and DFT calculations confirmed that the reaction pathways were distinct on Pt/SiO 2 and Pt-Na/SiO 2 . Specifically, on Pt-Na/SiO 2 , the reaction follows the mechanism of the direct degradation of formate species with the assistance of active hydroxyls; while on Pt/SiO 2 , CO is the only intermediate formed by the dehydrogenation of HCHO, due to the lack of active hydroxyls. These findings provide new insights into the reaction pathway of HCHO oxidation.
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高影响因子
FOOD CHEMISTRY
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2024
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IF 8.5
Mingfei Pan,Xiaochun Hu,Rui Gao,Boxi Zhou,Jingming Sun,Dan Zhang,Xuan Liu,Yixin Wang,Shuo Wang
In this work, the perovskite fluorescent nanocrystals (CsPbBr 3 ) were successfully synthesized and wrapped with SiO 2 shell, utilized for the assembly of solid-state detection strip capable of conveniently and specifically detection of aflatoxin B 1 (AFB 1 ). The SiO 2 coating aimed to enhance the stability of CsPbBr 3 nanocrystals. The resulting CsPbBr 3 @SiO 2 material exhibited remarkable fluorescence properties, and further self-assembled onto solid-state plate, generating AFB 1 -specific quenched fluorescence at a specific wavelength of 515 nm. When combined with the capture of AFB 1 by magnetic nanoparticles conjugated with aptamers (MNPs-Apt), it was achieved the good separation and specific detection of AFB 1 toxin in food matrices. The constructed fluorescent solid-state detection strip based on CsPbBr 3 @SiO 2 exhibited good response to AFB 1 toxin within a linear range of 0.1–100 ng mL −1 and an impressive detection limit as low as 0.053 ng mL −1 . This presents a new strategy for the rapid screening and convenient detection of highly toxic AFB 1 .
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PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Zhaowei Hou,Xiaolin Wu,Guopeng Wu,Yi Lu,Wei Lang,Xing Li,Xiaowei Li,Xin Zhao,Shouliang Lu
Foam has been widely employed in oilfields to modify the water injection profile for enhanced oil recovery (EOR). In the present study, the mixed binary AlOOH/SiO 2 nanoparticles (MBN) assisted polyethyleneglycolmonoisodecylether (PMIE) system was successfully constructed to stabilize foam for the first time. The foam volume, half-life, and bubble size were evaluated to explore the foam stability. It was found that the PMIE-MBN system stabilized foam displayed superior stability, whose mechanism was revealed via the measurements of the surface tension, dilatational viscoelasticity, and foam viscosity. The irreversible adsorption of MBN in the gas–liquid surface significantly improved the strength of the foam film and the intensive interaction between MBN and PMIE molecules effectively promoted the intensity of the viscoelastic network among foam bubbles in the water phase, which was essential for superior stability of the foam. Moreover, the PMIE-MBN system stabilized foam exhibited excellent stability even in the presence of crude oil. The sandpack flooding tests reflected that the PMIE-MBN system stabilized foam possessed the favorable blocking ability and significantly enhanced tertiary oil recovery (∼15.2 % of initial oil in place).
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Haoyu Ma,Jiaozhu Wu,Chengzhe Gao,Silin He,Pengjian Gong,Qiwu Shi,Zhao Wang,Guangxian Li,Chul B. Park
In the context of the future sixth-generation (6G) communication system, the development of multi-functional materials with ultra-low dielectric permittivity ( D k ) and ultra-low dielectric loss ( D f ) is of paramount importance for the design of terahertz (THz) frequency electromagnetic wave transmission devices. In this work, polyimide- block -polydimethylsiloxane (PI- b -PDMS copolymer, PIC) material with low D k , high flexibility and high supercritical fluid foaming ability was fabricated via copolymerization. Additionally, core–shell SiO 2 @BN nanofillers were synthesized by condensing tetraethyl orthosilicate (TEOS) on hexagonal boron nitride (BN) nanofiller surface. Subsequently, flexible polyimide/SiO 2 @BN foam was fabricated via supercritical N 2 foaming. The resulting PIC/SiO 2 @BN nanocomposites exhibit exceptional flexibility and impressive thermal resistance (thermal decomposition temperature 472.2 °C). Notably, the incorporation of core–shell SiO 2 @BN nanofillers leads to the formation of a molecular interface anchoring structure through hydrogen bonding effect. This structure effectively reduced the mobility of the flexible PIC polymer chains on the SiO 2 @BN nanofiller surfaces. Consequently, the porous PIC/SiO 2 @BN materials show a low shrinkage ratio, low dielectric property ( D k = 1.21, D f = 0.012 at 1 THz), excellent THz transmission rate (91.4 %) and long distance 6G THz signal coverage (125.99 m). Furthermore, porous PIC/SiO 2 @BN materials show superior flame-retardant and thermal infrared stealth properties.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Hongkun Li,Qianqian Cai,Yangyang Guan,Zhikang Li,Guifen Jie,Hong Zhou
A multimode sensing and imaging platform based on surface modification strategy of Ru(bpy) 3 2+ doped SiO 2 nanoparticles (RuSiO 2 NPs) was constructed for versatile detection of glutathione (GSH). RuSiO 2 NPs as the luminophore models had outstanding fluorescence (FL) and electrochemiluminescence (ECL) signals. Furthermore, its FL signal could be captured by electrophoresis analyzer, and the ECL signal could be imaged with mobile phone to achieve visualization. So, a unique and convenient multi-mode sensing and imaging platform could be developed based on RuSiO 2 NPs. SiO 2 NPs could realize enrichment of Ru(bpy) 3 2+ based on the nanoconfined effect to achieve signal amplification, and its surface was rich with abundant hydroxyl functional groups, which offered a channel for surface modification. Sulfhydryl modification on the RuSiO 2 NPs was realized by using silane coupling agent, and KMnO 4 was used to in situ generate MnO 2 shell on the surface of RuSiO 2 NPs for quenching its ECL, FL, and colorimetric (CL) signals based on resonance energy transfer (RET). Target GSH could reduce MnO 2 shell to realize recovery of all signals, thus achieving the label-free multimode detection of GSH. Therefore, this work developed a multimode sensing and imaging platform without signal labels or layer-by-layer assembly of electrodes, which had the advantages of simple steps, low cost, and high detection accuracy, showing important application potential in the field of bioanalysis.
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高影响因子
SURFACE & COATINGS TECHNOLOGY
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2025
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IF 6.1
Qibao Yang,Shaobai Sang,Fuyun Yang,Yawei Li,Tianbin Zhu,Heng Wang
RO-R 2 O-Al 2 O 3 -SiO 2 enamel coatings with varying Al 2 O 3 and MgO contents were prepared for the oxidation protection of 06Ni9DR alloy steels at 1100–1200 °C. The oxidation protection ratios of these coatings were investigated under different oxidation temperatures and time, and the degradation mechanism as well as the improvements in oxidation protection were explored. The results revealed that the oxidation protection ratio of traditional enamel coating with low crystalline phase content significantly decreased with oxidation test temperatures and time. The viscosity of the liquid phase in coating reduced with temperatures, facilitating oxygen diffusion. Additionally, the interaction between the coating and the oxidation products of alloy steel further reduced the liquid phase viscosity, decreasing coating thickness and shortening oxygen diffusion paths. However, the oxidation protection of coating with higher Al 2 O 3 and MgO content were enhanced. These coatings exhibited higher crystalline phases content, which effectively increased the apparent viscosity of enamel coating and prolonged oxygen diffusion paths. The thermal stability of coating with high crystalline phases content also were improved. Among these coatings, the coating with 27.47 wt% Al 2 O 3 and 9.93 wt% MgO achieved superior oxidation protection, up to 92.1 %, 76.6 %, and 73.4 % at 1100 °C, 1150 °C, and 1200 °C for 180 min, respectively.
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高影响因子
CONSTRUCTION AND BUILDING MATERIALS
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2018
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IF 3.485
Junpeng Mei,Hongbo Tan,Hainan Li,Baoguo Ma,Xiaohai Liu,Wenbin Jiang,Ting Zhang,Xin Li
Generally, high volume fly ash would considerably reduce the early strength of cement-based materials, and because of this disadvantage, the added amount of fly ash in steam-cured precast concrete is very limited. In this study, an attempt to enhance the early strength of steam-cured cement-high volume fly ash (40 wt%, CHVFA) system has been done with addition of nano-SiO 2 (NS) and sodium sulfate (SS). Effect of these two chemicals on hydration, pore structure, and microstructure of interfacial transition zone (ITZ) were investigated. The results show that both NS and SS can improve the compressive strength, and the reason is mainly because these two chemicals can accelerate the hydration of cement minerals and can also hasten the pozzolanic reaction of fly ash. By contrast, because of the high activity of pozzolanic reaction and the filling and nucleation effects, NS has much stronger effect on refining pore structure and promoting the hydration of cement; while SS can exert much stronger effect on accelerating the hydration of fly ash than that of NS. An interesting thing can also be seen that with co-doped NS-SS, the enhancement in compressive strength is much stronger than that of the sum of these single systems with the same dosage, indicating that NS and SS can exert the synergistic effect; this effect is involved in the accelerated hydration of CHVFA, the refined pore structure, and the improved microstructure of ITZ. Such results would be expected to provide guidance on enhancing the early strength of steam-cured precast concrete with high volume fly ash in practical engineering.
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高影响因子
CHEMOSPHERE
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2024
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IF 8.1
Wenbo You,Linyunuo Lai,Jiahui Li,Yingying Zhao,Jie Tian,Liwu Zhang,Jia Hong Pan
Exploiting solid powder fluorescence holds significant potential in diverse domains including medicine and forensics. Conventional fingerprint detection methods often fall short due to low contrast, sensitivity, and high toxicity. To addressing these challenges, we present a novel method for latent fingerprint detection using fluorescent carbon dots (CDs) encapsulated into conventional or mesoporous SiO 2 colloidal spheres (CD@SiO 2 or CDs@ m -SiO 2 ) through a surface functionalization-assisted cooperative assembly process. The synthesized monodisperse CDs@SiO 2 and CDs@ m -SiO 2 spheres, with tuning particle size, adjustable porosity and pore size, and highly dispersed CDs, exhibit improved fingerprint visibility and contrast on various substrates such as glass, stainless steel, and plastic. CDs located in SiO 2 with excellent affinity effectively avoids their solid-state self-quenching phenomenon, which, coupling with mesoporous SiO 2 shell, maximumly retains their fluorescence properties. Our method demonstrates a high contrast, selectivity, and sensitivity in fingerprint detection, offering an environmentally friendly and healthy alternative to conventional techniques, and showcasing a facile route to novel solid-state CDs-based fluorescent materials for forensic analysis.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
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IF 6.3
Zhentong Lu,Zhiqiang Tang,Haoran Zhang,Wei Li,Jianle Zhuang,Chaofan Hu,Yingliang Liu,Bingfu Lei,Xuejie Zhang
In situ precipitation of CsPbBr 3 quantum dots within glass (CsPbBr 3 QDs@galss) is considered as one of the effective methods to overcome their instability and achieve practical applications. However, challenges such as low photoluminescence quantum yield (PLQY), poor thermostability and photostability still persist. Herein, we modulated the rigidity of the glass network structure by adjusting the SiO 2 content in the phosphate glass matrix. This strategy allowed us to successfully fabricate CsPbBr 3 QDs@glass composites with excellent crystallinity and luminescence properties. This composite exhibits a narrow-band emission at 515 nm with a remarkable PLQY up to 72 % under 455 nm excitation, 1.7 times higher than that of unintroduced SiO 2 . Moreover, it retains approximately 30 % of its initial luminescence intensity even at a high temperature of 373 K. Meanwhile, the fabricated green LED maintains its luminescence intensity at about 93 % of the initial value after 120 h of continuous operation. To demonstrate its conceptual application, an LCD screen was also assembled using a white LED lighting strip based on CsPbBr 3 QDs@glass that shows outstanding color reproduction and color saturation.
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高影响因子
CRYSTENGCOMM
·
2024
·
IF 2.6
Shanxiang Sheng,Meng Wu,Chao Zhi,Yongzhen Wang,Jiaguang Meng,Yaming Liu
High saturation and high stability are two issues that must be addressed in the practical application of structural color based on self-assembly of colloidal microspheres. Herein, we coated SiO2 microspheres with island-like polypyrrole (PPy), a black substance that can absorb incoherent light scattering, thereby enhancing the saturation of structural colors on both black and white substrates. Besides, the irregular island-like structure prompts the SiO2@PPy microspheres to form a short-range ordered amorphous structure, exhibiting non-iridescent structural colors. Importantly, we propose a melt-curing strategy that can enhance the interaction forces between the two microspheres and between the microspheres and the substrate, thus enabling the structural colors to exhibit good stability. Even after rubbing, folding, and ultrasonic cleaning tests, the color of the cured sample remains virtually unchanged. The SiO2@PPy microspheres prepared and the melt curing strategy in this work can lay foundations for the practical application of structural colors.
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高影响因子
Journal of Coatings Technology and Research
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2024
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IF 2.3
Guo YanXin,Wang Jinwei,Su Xinyong,Tang Can,Wang Jiaao
SiO 2 -EDTA composite particles are prepared by using nano-silicon dioxide (SiO 2 ) as the loading particle and ethylenediaminetetraacetic acid (EDTA) as the scaling inhibitor. Then, SiO 2 -EDTA particle and polytetrafluoroethylene (PTFE) micro powder are added in water-based silanized maleic anhydride-g-poly(1,2-butadiene) (SiMLPB) to fabricate composite coatings with good anti-scaling and anti-corrosion properties. The water contact angles (WCA) of SiMLPB increase to a maximum of 103° with the addition of PTFE at 3 wt% and then decrease slowly; based on this formulae, the WCA improves to 109 o when SiO 2 -EDTA is added up to 2 wt%. SiMLPB/PTFE coatings exhibit good corrosion resistance with the addition of PTFE; the SiMLPB/3%PTFE/2%SiO 2 -EDTA composite coating possesses impedance (| Z | 0.01Hz ) value at 2 orders higher than that of the SiMLPB/PTFE0 coating at low frequency, suggesting the much greater improvement in corrosion resistance due to the synergistic effects of adding nanoparticle as a surface modifier and EDTA as a corrosion inhibitor. The deposition of CaCO 3 on this SiMLPB/PTFE/SiO 2 -EDTA composite coating reaches 0.0132 g/cm 2 after 120 h scaling test, which is about 79% lower than that on the pure SiMLPB coating, resulting from the chelation of EDTA that promotes the formation of more unstable scales. The improvements in both anti-corrosion and anti-scaling performances are attributed to the hydrophobic function of PTFE and nanoparticle as well as the dual functions of EDTA at an appropriate addition of SiO 2- EDTA.
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高影响因子
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